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The Impact of Physical Activity Intensity on the Dynamic Progression of Cardiometabolic Multimorbidity: Prospective Cohort Study Using UK Biobank Data

The Impact of Physical Activity Intensity on the Dynamic Progression of Cardiometabolic Multimorbidity: Prospective Cohort Study Using UK Biobank Data

The Impact of Physical Activity Intensity on the Dynamic Progression of Cardiometabolic Multimorbidity: Prospective Cohort Study Using UK Biobank Data

Authors of this article:

Bao-Peng Liu1 Author Orcid Image ;   Jia-Hui Zhu1 Author Orcid Image ;   Li-Peng Wan1 Author Orcid Image ;   Zhen-Yu Zhao1 Author Orcid Image ;   Xinting Wang1 Author Orcid Image ;   Cun-Xian Jia1 Author Orcid Image
Article Authors Cited by (3) Tweetations (4) Metrics

    Original Paper

    Department of Epidemiology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, China

    Corresponding Author:

    Cun-Xian Jia, PhD

    Department of Epidemiology, School of Public Health

    Cheeloo College of Medicine

    Shandong University

    Wenhua Xi Road, No 44

    Jinan, 250012

    China

    Phone: 86 88382141 ext 8809

    Email: jiacunxian@sdu.edu.cn


    Background: Although many studies have reported on the associations between the amount of physical activity (PA) and the transitions of cardiometabolic multimorbidity (CMM), the evidence for PA intensity has not been fully evaluated.

    Objective: This study aimed to explore the impact of PA intensity on the dynamic progression of CMM.

    Methods: The prospective cohort of this study using data from the UK Biobank included 359,773 participants aged 37-73 years who were recruited from 22 centers between 2006 and 2010. The diagnoses of CMM, which included the copresence of type 2 diabetes (T2D), ischemic heart disease, and stroke, were obtained from first occurrence fields provided by the UK Biobank, which included data from primary care, hospital inpatient record, self-reported medical condition, and death registers. The PA intensity was assessed by the proportion of vigorous PA (VPA) to moderate to vigorous PA (MVPA). Multistate models were used to evaluate the effect of PA intensity on the dynamic progression of CMM. The first model (model A) included 5 transitions, namely free of cardiometabolic disease (CMD) to first occurrence of CMD (FCMD), free of CMD to death, FCMD to CMM, FCMD to mortality, and CMM to mortality. The other model (model B) used specific CMD, namely T2D, ischemic heart disease, and stroke, instead of FCMD and included 11 transitions in this study.

    Results: The mean age of the included participants (N=359,773) was 55.82 (SD 8.12) years at baseline, and 54.55% (196,271/359,773) of the participants were female. Compared with the participants with no VPA, participants with intensity levels of >0.75 to <1 for VPA to MVPA had a 13% and 27% lower risk of transition from free of CMD to FCMD (hazard ratio [HR] 0.87, 95% CI 0.83-0.91) and mortality (HR 0.73, 95% CI 0.66-0.79) in model A, respectively. The HR for the participants with no moderate PA was 0.82 (95% CI 0.73-0.92) compared with no VPA. There was a substantially protective effect of higher PA intensity on the transitions from free of CMD to T2D and from T2D to mortality, which reveals the importance of PA intensity for the transitions of T2D. More PA and greater intensity had a synergistic effect on decreasing the risk of the transitions from free of CMD to FCMD and mortality. Male participants, younger adults, adults with a higher BMI, current or previous smokers, and excessive alcohol drinkers could obtain more benefits from higher PA intensity for the lower risk of at least 1 transition from free of CMD, then to CMM, and finally to mortality.

    Conclusions: This study suggests that higher PA intensity is an effective measure for preventing CMM and mortality in the early period of CMM development. Relevant interventions related to higher PA intensity should be conducted.

    JMIR Public Health Surveill 2023;9:e46991

    doi:10.2196/46991

    Keywords

    physical activity intensity; PA; dynamic progression; cardiometabolic multimorbidity; cohort study; CMM 


    Background

    Multimorbidity, defined as the coexistence of ≥2 chronic conditions from noncommunicable disease, mental disease, or infectious disease of long duration, is an unignorable public health issue that brings great physical and mental burden to families [1]. Cardiometabolic multimorbidity (CMM), namely the copresence of type 2 diabetes (T2D), ischemic heart disease (IHD), and stroke, is associated with significantly multiplicative mortality risk and lower life expectancy [2,3]. The prevalence of CMM for adults in the United States is 14.4% and is higher among the male population and older adults [4]. Previous studies characterized a troubling rise in the prevalence of CMM from 1999 to 2018 [4]. Early prevention is needed in consideration of the many adverse health outcomes related to CMM, such as cognitive decline, dementia, depression, and even a worse COVID-19 prognosis [5-8]. Previous studies have mentioned that many variables such as handgrip strength, sleep pattern, beverage consumption, shift work, and ambient air pollution are independent factors for predicting CMM [9-13]. Exploring more factors affecting the early stage of CMM, which means free of cardiometabolic disease (CMD) or first occurrence of CMD (FCMD), is necessary for preventing adverse and severe outcomes in the future.

    A high level of physical activity (PA), especially for a longer duration of moderate to vigorous PA (MVPA), has been shown to be the common protective factor for CMD, including T2D [14-16], IHD [17-19], stroke [20-22], CMM [23-26], and death [27-30]. Previous studies also reported that a higher intensity of PA, namely a higher proportion of vigorous PA (VPA), could bring additional benefits for reducing the risk of mortality [31-34]. However, there is limited evidence for the associations of PA intensity with CMD and CMM. In other words, it is unclear whether a higher intensity of PA has a positive effect on decreasing the risk of mortality among the participants with CMD or CMM. Furthermore, previous studies also reported that the amount of PA, namely the duration or metabolic equivalent task (MET) for PA, could affect all the stages from healthy status to CMD, then to CMM, and finally to mortality [23,24]. To the best of our knowledge, no previous studies have evaluated the association of PA intensity with all the transitions simultaneously. Considering the studies focusing on a single transition might overlook some competing risks of mortality, future studies should investigate how PA intensity affects the dynamic progression from the free of CMD status to CMM and from other status to mortality.

    Objectives

    This study aimed to explore the associations of PA intensity with the dynamic progression of CMM, namely from free of CMD to FCMD, then to CMM, and finally to mortality. In addition, the effect of PA intensity on the transitions from specific CMD, namely T2D, IHD, and stroke, to CMM and mortality was further assessed. Furthermore, the effect of modification by sociodemographic factors and the amount of PA was also assessed. The findings of this study would provide some evidence of the benefits and help relevant departments to develop some interventions related to the PA intensity for CMM and mortality.


    Study Design and Participants

    The UK Biobank (UKB) is an ongoing population-based and prospective cohort, which includes >500,000 participants aged 37 to 73 years. The details of recruitment for the UKB can be found elsewhere [35]. The main aims of the UKB are to explore genetic and nongenetic determinants of the diseases among middle-aged adults and older adults. Briefly, UKB participants were recruited from 22 centers in the United Kingdom (England, Wales, and Scotland) between 2006 and 2010 at baseline. After obtaining electronic consent for the use of deidentified data, every participant finished a self-completed touchscreen questionnaire, including socioeconomic factors and lifestyles. In addition, computer-assisted interviews, physical measurements, and sample collection were also conducted. The records from national health-related hospitals, primary care, and death registers were also matched with the included participants, which could help us comprehensively understand their health status.

    In this study, we excluded participants whose records were withdrawn or could not be followed up from the cohort. In addition, the participants with missing PA data at baseline were also excluded. Finally, we excluded the participants with CMD at baseline to avoid inverse causality. Finally, 359,773 participants were included in this study (Figure S1 in Multimedia Appendix 1).

    Measures

    Exposures

    In this study, PA was assessed by using the short-form International Physical Activity Questionnaire, which has good validity and reliability [36]. The MET of moderate PA (MPA) and VPA calculated by the UKB was used in this study (data field 22038 and 22039). MVPA, which is the sum of MET associated with MPA and VPA, was used to assess the amount of PA according to the recommendations of the World Health Organization PA guidelines [37]. First, the amount of PA was categorized into <600, 600 to 1200, and >1200 MET minutes per week associated with MVPA. Second, PA intensity, which is the ratio of VPA to MVPA, was measured by using the MET of VPA to MVPA as follows: MET (VPA) / MET (MVPA). The PA intensity ranged from 0 to 1, and a higher ratio indicated higher PA intensity. Different categories (0, >0 to 0.25, >0.25 to 0.5, >0.5 to 0.75, >0.75 to <1, and 1) of PA intensity were used to assess the associations with all the transitions from the free of CMD status to FCMD, then to CMM, and finally to mortality. In addition, the ordinal scale, which coded the PA intensity from 0 to 5, was also used to measure the associations.

    Outcomes

    The incidence, progression, and prognosis of CMM, namely the occurrence of at least 2 diseases of T2D, IHD, and stroke, were the main outcomes in this study. The diagnoses and time of occurrence were obtained from first occurrence fields provided by UKB (data category: 2409) and were coded using the International Classification of Disease, 10th version, which included data from primary care, hospital inpatient record, self-reported medical condition, and death registers. T2D was coded by E11 and E14, as recommended in previous studies related to CMM diagnoses [9,24]. IHD was coded by I20-I25, and stroke was coded by I60-I69.

    The records related to all-cause mortality were identified by linking to death registries of the National Health Service Information Centre for participants from England and Wales and the National Health Service Central Register for participants from Scotland [35]. The participants entered the cohort from the date of being recruited at the centers and exited at the date of death, occurrence of outcomes at respective progression, or censorship.

    Covariates

    The covariates in this study, which were chosen according to previous studies on CMM [9,23,24], included age, sex, ethnicity, socioeconomic status (SES), BMI, household income before tax per year, study center region, education group, smoking status, and alcohol drinking status. According to previous studies [38,39], an a priori–defined directed acyclic graph [40] was drawn to show the relationship between the covariates and outcomes (Figure S2 in Multimedia Appendix 1). Ethnicity was classified as either White or Others. The SES was measured using the Townsend area deprivation index [41]. Higher scores indicated greater socioeconomic deprivation and lower SES, and quartiles of the score for SES were included in the analyses. The data field and definition of other included covariates are shown in Table S1 in Multimedia Appendix 1. Missing values for the covariates were regarded as a classification when performing the analyses.

    Statistical Analysis

    We used R (version 4.1.2; R Foundation for Statistical Computing) software to perform statistical analyses. Initially, traditional Cox proportional hazards models were used to explore the association of the amount of PA and intensity with FCMD, CMM, and all-cause mortality. No obvious violations to the proportional hazards assumption were noted for interested exposures. All the models were adjusted for age, sex, ethnicity, SES, BMI, household income before tax per year, study center region, education group, smoking status, and alcohol drinking status.

    Furthermore, multistate models [42,43] were used to assess the effect of PA amount and intensity on the transitions from free of CMD to FCMD, then to CMM, and finally to mortality. The multistate model, which was an extension of the traditional Cox proportional hazards model and competing risk model, was widely used to explore the effect of interested risk factors on multiple transitions related to multistate outcomes. In this study, we adopted 2 series of multistate models, as recommended by previous studies [9,23,24]. The first model (model A) included 5 transitions, namely free of CMD to FCMD, free of CMD to death, FCMD to CMM, FCMD to mortality, and CMM to mortality (Figure 1). The other model (model B) used specific CMD, namely T2D, IHD, and stroke, instead of FCMD and included 11 transitions (Figure 1). When the participants had the same date for different transitions, we adopted a theoretically time of pushing entering date forward by 0.5 day, which was based on previous studies related to a similar topic [9,24]. When performing model B, we excluded 962 participants with the same date of diagnosis for T2D, IHD, or stroke to explore disease-specific associations, as we were unsure which disease occurred first.

    ‎
    Figure 1. Transitions from free of cardiometabolic disease (CMD) to mortality outcomes: (A) 5-transition model and (B) 11-transition model. CMM: cardiometabolic multimorbidity; FCMD: first cardiometabolic disease; IHD: ischemic heart disease; T2D: type 2 diabetes.

    A series of subgroup analyses related to age (≤60 vs >60 y), sex (female vs male), BMI (underweight or normal weight vs overweight), smoking status (never vs previous or current), and alcohol drinking status (daily or almost daily vs ≤1-3 times/wk) were performed to identify the susceptible populations associated with PA intensity. Z test was used to compare the estimates of different subgroups, as recommended by Altman and Bland [44].

    We performed several sensitivity analyses to verify the robustness of the estimates of model A. First, we used different time intervals (0.5 y, 1 y, 2 y, 3 y, and 5 y) to theoretically change the entering time to test the stability of the estimates. Second, we excluded the participants who entered different transitions on the same day. Third, we omitted the participants with FCMD for the first 2 years of follow-up to account for reverse causality. Fourth, considering the interactive effect of cancer and CMD, we reanalyzed the associations by omitting the participants with cancer at baseline. In addition, the participants with missing covariate values were excluded from the analyses. Finally, considering the correlation of air pollution with PA and CMM, we separately added particulate matter 2.5, particulate matter 10, nitric oxide, and nitrogen dioxide at baseline in the multistate models. The data of air pollution were estimated using the Land Use Regression model developed as part of the European Study of Cohorts for Air Pollution Effects and can be found in the UKB database (field id: 24003, 24004, 24005, and 24006).

    Ethical Considerations

    UKB received ethics approval from the North West Multi-centre Research Ethics Committee (reference 21/NW/0157). All participants provided written informed consent before enrollment in the study, which was conducted in accordance with the principles of the Declaration of Helsinki. The data used in this study were anonymized and deidentified for privacy and confidentiality protection. More details about ethics approval can be found on the UKB website.


    Participant Characteristics at Baseline and Transitions From Baseline to Mortality

    Of the included participants, 54.55% (196,271/359,773) were female and 94.91% (341,474/359,773) were White. The mean age of the participants was 55.82 (SD 8.12) years at baseline. Moreover, 64.12% (230,676/359,773) of the participants were overweight and obese, and 88.68% (319,043/359,773) of the participants were recruited from England; 56.06% (201,671/359,773) of the participants never smoked, and 70.21% (252,589/359,773) of the participants drank daily, almost daily, or more than once per week. Furthermore, 38.9% (139,963/359,773), 19.55% (70,329/359,773), and 41.55% (149,481/359,773) of the included participants had MVPA of <600, 600 to 1200, and >1200 MET minutes per week, respectively. The participants with lower PA intensity were more likely to be female; be of younger age, belong to a different ethnicity, have a lower SES, have a higher BMI, have lower income, have a lower education level, engage in more frequent drinking, and have less PA; and be current smokers. All the differences for different groups of PA intensity were statistically significant. More characteristics for included participants are shown in Table 1.

    There were 2 patterns for the transitions from free of CMD to FCMD, then to CMM, and finally to mortality. The 5-transition model and 11-transition model are shown in Figure 1. For pattern A, 11.46% (41,237/359,773) of the participants developed FCMD and 4.02% (14,451/359,773) of the participants among baseline participants free of CMD died eventually. Moreover, 10.58% (4363/41,237) of the participants developed CMM, and 14.53% (5991/41,237) of the participants died after FCMD. Finally, 24.23% (1057/4363) of the participants died after a CMM diagnosis. For pattern B, 3.36% (12,059/358,811), 6.12% (21,966/358,811), and 1.74% (6250/358,811) of the participants, among the baseline participants free of CMD, first developed T2D, IHD, and stroke, respectively. Moreover, 8.44% (3401/40275) of the participants developed CMM, and 14.88% (5991/40275) of the participants died after a diagnosis of T2D, IHD, and stroke. Eventually, 25.52% (868/3401) of the participants died after having a diagnosis of CMM. More details are presented in Figure 1.

    Table 1. Descriptive statistics by physical activity (PA) intensity (N=359,773).
    CharacteristicsaOverallNo MVPAb (n=47,514)PA intensity: the proportion of VPAc to MVPA



    		0 (n=94,989)>0 to 0.25 (n=42,934)>0.25 to 0.5 (n=65,347)>0.5 to 0.75 (n=75,480)>0.75 to <1 (n=24,606)1 (n=8903)
    Sex, n (%)

    		Female196,271 (54.55)26,608 (56)57,040 (60.05)24,332 (56.67)35,951 (55.02)36,792 (48.74)11,154 (45.33)4394 (49.35)

    		Male163,502 (45.44)20,906 (44)37,949 (39.95)18,602 (43.33)29,396 (44.98)38,688 (51.25)13,452 (54.67)4509 (50.64)
    Age (years), mean (SD)55.82 (8.12)55.60 (7.91)57.05 (7.92)57.54 (7.87)56.00 (8.11)54.45 (8.15)53.11 (8.01)53.47 (8.1)
    Ethnicity, n (%)

    		White341,474 (94.91)44,652 (93.98)90,312 (95.08)41,432 (96.5)62,396 (95.48)71,274 (94.43)23,188 (94.24)8220 (92.33)

    		Others17,256 (4.8)2677 (5.63)4429 (4.66)1386 (3.23)2768 (4.23)4002 (5.3)1349 (5.48)645 (7.24)

    		Unknown1043 (0.29)185 (0.39)248 (0.26)116 (0.27)183 (0.28)204 (0.27)69 (0.28)38 (0.04)
    Socioeconomic status, n (%)d

    		First quartile89,899 (24.99)10,834 (22.8)22,203 (23.37)11,253 (26.21)16,946 (25.93)19,662 (26.05)6722 (27.31)2279 (25.6)

    		Second quartile89,761 (24.95)11,309 (23.8)23,192 (24.41)11,122 (25.9)16,653 (25.48)18,996 (25.17)6341 (25.77)2148 (24.13)

    		Third quartile89,832 (24.97)11,689 (24.6)23,831 (25.09)10,849 (25.27)16,404 (25.1)18,852 (24.98)6009 (24.42)2198 (24.69)

    		Fourth quartile89,827 (24.97)13,613 (28.65)25,640 (26.99)9666 (22.51)15,264 (23.36)17,874 (23.68)5501 (22.36)2269 (25.48)

    		Unknown454 (0.13)69 (0.14)123 (0.13)44 (0.1)80 (0.12)96 (0.13)33 (0.13)9 (0.1)
    BMI (kg/m2), n (%)

    		Underweight (<18.5)1939 (0.54)296 (0.62)638 (0.67)244 (0.57)325 (0.5)313 (0.41)95 (0.39)28 (0.31)

    		Normal weight (18.5-24.9)125,609 (34.91)12,981 (27.32)30,952 (32.58)16,229 (37.8)24,794 (37.94)28,015 (37.11)9536 (38.75)3102 (34.84)

    		Overweight (25.0-29.9)154,404 (42.92)19,466 (40.97)40,039 (42.15)18,632 (43.4)28,244 (43.22)33,311 (44.13)10,843 (44.07)3869 (43.46)

    		Obese (≥30)76,272 (21.2)14,359 (30.22)22,929 (24.14)7691 (17.91)11,774 (18.02)13,574 (17.98)4076 (16.56)1869 (20.99)

    		Unknown1549 (0.43)412 (0.87)431 (0.45)138 (0.32)210 (0.32)267 (0.35)56 (0.23)35 (0.39)
    Household income before tax/y (£e), n (%)

    		<18,00062,366 (17.33)9501 (20.15)19,972 (21.02)8107 (18.88)10,569 (16.17)10,553 (13.98)2556 (10.39)1108 (12.44)

    		18,000-30,99978,380 (21.78)9601 (20.21)21,950 (23.11)11,395 (26.54)14,942 (22.86)14,902 (19.74)4174 (16.96)1416 (15.9)

    		31,000-51,99986,831 (24.13)11,069 (23.3)21,890 (23.04)10,544 (24.56)16,194 (24.78)18,796 (24.9)6184 (25.13)2154 (24.19)

    		52,000-100,00071,816 (19.96)9043 (19.03)15,859 (16.7)6560 (15.28)12,909 (19.75)17,951 (23.78)7112 (28.9)2382 (26.75)

    		>100,00019,873 (5.52)2129 (4.48)3726 (3.92)1551 (3.61)3532 (5.4)5634 (7.46)2557 (10.39)744 (8.36)

    		Unknown40,507 (11.26)6171 (12.99)11,592 (12.2)4777 (11.13)7201 (11.02)7644 (10.13)2023 (8.22)1099 (12.34)
    Study center region, n (%)

    		England319,043 (88.68)41,593 (87.54)83,956 (88.38)38,619 (89.95)58,252 (89.15)66,963 (88.72)21,773 (88.49)7887 (88.59)

    		Wales14,829 (4.12)2309 (4.86)3965 (4.17)1639 (3.82)2496 (3.82)3057 (4.05)996 (4.05)367 (4.12)

    		Scotland25,901 (7.2)3612 (7.6)7068 (7.44)2676 (6.23)4599 (7.04)5460 (7.23)1837 (7.46)649 (7.29)
    Education group, n (%)

    		College or university degree129,911 (36.11)14,438 (30.39)30,719 (32.34)14,510 (33.8)24,849 (38.03)30,087 (39.86)11,581 (47.06)3727 (41.86)

    		 Any school degree (A-levelf, AS-levelg, O-levelh, GCSEi, and CSEj)138,483 (38.49)19,240 (40.49)37,065 (39.02)17,251 (40.18)24,817 (37.98)28,106 (37.24)8707 (35.38)3297 (37.03)

    		 Vocational qualification (NVQk, HNDl, or HNCm) or other professional qualifications40,545 (11.27)5054 (10.64)10,947 (11.52)5524 (12.87)7747 (11.85)8154 (10.8)2329 (9.46)790 (8.87)

    		None of the above48,412 (13.46)8351 (17.57)15,565 (16.39)5414 (12.61)7548 (11.55)8644 (11.45)1878 (7.63)1012 (11.37)

    		Unknown2422 (0.67)431 (0.91)693 (0.73)235 (0.55)386 (0.59)489 (0.65)111 (0.45)77 (0.86)
    Smoking status, n (%)

    		Never201,671 (56.06)25,457 (53.58)51,901 (54.64)23,844 (55.54)37,116 (56.8)43,488 (57.61)14,705 (59.76)5160 (57.96)

    		Previous121,014 (33.64)15,493 (32.61)31,669 (33.34)15,045 (35.04)22,407 (34.29)25,374 (33.61)8061 (32.76)2965 (33.3)

    		Current36,181 (10.06)6385 (13.44)11,144 (11.73)3951 (9.2)5706 (8.73)6454 (8.55)1787 (7.26)754 (8.47)

    		Unknown907 (0.25)179 (0.38)275 (0.29)94 (0.22)118 (0.18)164 (0.22)53 (0.21)24 (0.27)
    Alcohol drinking status, n (%)

    		Daily or almost daily77,268 (21.48)9664 (20.34)20,644 (21.73)10,029 (23.36)14,441 (22.1)15,753 (20.87)5028 (20.43)1709 (19.19)

    		Above 1 time/wk181,021 (50.31)21,422 (45.08)44,118 (46.44)21,470 (50.01)34,130 (52.23)41,242 (54.64)13,925 (56.59)4714 (52.95)

    		1-3 times/mo39,390 (10.95)5740 (12.08)10,895 (11.47)4604 (10.72)6943 (10.62)7664 (10.15)2563 (10.42)981 (11.02)

    		Special occasions only37,073 (10.3)6042 (12.72)11,479 (12.08)4323 (10.07)5969 (9.13)6511 (8.63)1850 (7.52)899 (10.1)

    		Never24,830 (6.9)4601 (9.68)7791 (8.2)2496 (5.81)3840 (5.88)4277 (5.67)1231 (5)594 (6.67)

    		Unknown191 (0.05)45 (0.09)62 (0.06)12 (0.03)24 (0.04)33 (0.04)9 (0.04)6 (0.07)
    PA amount (METn min/wk), n (%)

    		<600139,963 (38.9)47,514 (100)58,656 (61.75)3780 (8.8)12,729 (19.48)10,695 (14.17)2726 (11.08)3863 (43.39)

    		600-120070,329 (19.55)0 (0)17,960 (18.91)9121 (21.24)16,019 (24.51)17,574 (23.25)7118 (28.93)2537 (28.5)

    		>1200149,481 (41.55)0 (0)18,373 (19.34)30,033 (69.95)36,599 (56.01)47,211 (62.5)14,762 (60) 2503 (28.11)

    aUnknown included prefer not to answer, do not know, and missing values in the UK Biobank database.

    bMVPA: moderate to vigorous PA.

    cVPA: vigorous PA.

    dSocioeconomic status was measured by using the Townsend area deprivation index.

    eA currency exchange rate of £1=US $1.26 is applicable.

    fA-level: Advanced level.

    gAS-level: Advanced Subsidiary level.

    hO-level: Ordinary level.

    iGCSE: General Certificate of Secondary Education.

    jCSE: General Certificate of Education.

    kNVQ: National Vocational Qualification.

    lHND: Higher National Diploma.

    mHNC: Higher National Certificate.

    nMET: metabolic equivalent task.

    Traditional Cox Proportional Hazards Model

    The estimates of the associations of PA amount and intensity with FCMD, CMM, and mortality are presented in Table S2 in Multimedia Appendix 1. More MVPA with 600-1200 and >1200 MET minutes per week lowered the risk of FCMD, CMM, and mortality than MVPA with <600 MET minutes per week. A decreased risk of FCMD, CMM, and mortality was also found in the participants with more VPA to MVPA (>0 to <1) than in the participants with no VPA. However, the associations of no MPA, namely total VPA with FCMD (P=.073), CMM (P=.294), and mortality (P=.123), were not statistically significant compared with no VPA. Similar results were found when the ordinal scale of PA intensity was used in the models.

    Multistate Models

    Multistate models for the associations of PA amount (Table S3 in Multimedia Appendix 1) and intensity (Table 2) with all the transitions were performed. First, meeting the recommendations of the World Health Organization, namely no less than 600 MET minutes per week for MVPA were found to be negatively associated with transitions from free of CMD to FCMD and mortality. In addition, >1200 MET minutes per week for MVPA was significantly associated with a decreased risk of transition from FCMD to CMM. When focusing on specific FCMD, more PA was found to be associated with a decreased risk of transitions from free of CMD to T2D, IHD, stroke, and mortality as well as transitions from stroke to CMM and from T2D to mortality.

    A greater proportion of VPA to MPA, namely >0.5 for the proportion of VPA to MVPA, was associated with a lower risk of different transitions. Our analyses showed that compared with the participants with no VPA, participants with >0.75 to <1 of VPA to MVPA had a 13% and 27% lower risk of transition from free of CMD to FCMD (hazard ratio [HR] 0.87, 95% CI 0.83-0.91) and mortality (HR 0.73, 95% CI 0.66-0.79), respectively. Furthermore, the HR for the participants with no MPA was 0.82 (95% CI 0.73-0.92) compared with those with no VPA. The participants with >0.75 to <1 VPA to MVPA had the lowest risk of transitions from free of CMD to FCMD and mortality. The decreased risk of transitions from free of CMD to FCMD and mortality was also related to higher PA intensity in consideration of the ordinal scale. However, we did not find significant associations of PA intensity with other transitions in model A.

    Model B showed different associations of PA intensity with the transitions related to specific FCMD. Specifically, a greater proportion of VPA to MPA was associated with a lower risk of transitions from free of CMD to T2D and stroke. In addition, a decreased risk of transitions from stroke to CMM and from T2D to mortality was found to be associated with >0.5 to 0.75 of VPA to MVPA. It was noted that lower PA intensity, that is, >0 to 0.5 of VPA to MVPA, was also found to be associated with a lower risk of transition from T2D to mortality. The ordinal scale of higher PA intensity was significantly associated with a lower risk of transition from free of CMD to T2D, stroke, and mortality.

    Table 2. Associations of physical activity (PA) intensity with transitions from free of cardiometabolic disease (CMD) to first occurrence of CMD (FCMD), cardiometabolic multimorbidity (CMM), and mortality.
    TransitionsPA intensity: the proportion of VPAa to MVPAb, HRc (95% CI)

    		0>0 to 0.25>0.25 to 0.5>0.5 to 0.75>0.75 to <11Ordinal scale
    Model Ad

    		From free of CMD to FCMDReference0.90 (0.87-0.93)e0.90 (0.87-0.92)e0.89 (0.87-0.92)e0.87 (0.83-0.91)e0.97 (0.90-1.03)0.97 (0.97-0.98)e

    		From free of CMD to mortalityReference0.90 (0.85-0.95)e0.85 (0.81-0.89)e0.80 (0.76-0.84)e0.73 (0.67-0.79)e0.82 (0.73-0.93)f0.94 (0.92-0.95)e

    		From FCMD to CMMReference0.91 (0.82-1.01)0.98 (0.89-1.08)0.91 (0.83-1.00)1.04 (0.90-1.21)1.05 (0.85-1.30)1.00 (0.97-1.02)

    		From FCMD to mortalityReference0.93 (0.85-1.02)0.92 (0.85-1.00)0.93 (0.86-1.01)0.94 (0.83-1.08)0.98 (0.82-1.18)0.99 (0.97-1.01)

    		From CMM to mortalityReference1.07 (0.86-1.32)0.97 (0.80-1.18)1.04 (0.85-1.26)0.93 (0.66-1.32)1.16 (0.76-1.77)1.01 (0.96-1.06)
    Model Bd

    		From free of CMD to T2DgReference0.74 (0.69-0.79)e0.77 (0.72-0.81)e0.77 (0.73-0.82)e0.73 (0.66-0.79)e0.99 (0.88-1.12)0.94 (0.93-0.95)e

    		From free of CMD to IHDhReference0.96 (0.91-1.00)0.95 (0.91-0.99)i0.97 (0.93-1.01)0.95 (0.89-1.01)1.02 (0.93-1.11)1.00 (0.99-1.01)

    		From free of CMD to strokeReference1.06 (0.97-1.15)0.97 (0.90-1.05)0.91 (0.85-0.99)i0.91 (0.81-1.03)0.75 (0.62-0.92)f0.97 (0.95-0.99)f

    		From free of CMD to mortalityReference0.90 (0.85-0.95)e0.85 (0.81-0.89)e0.80 (0.76-0.84)e0.73 (0.67-0.79)e0.82 (0.73-0.93)f0.94 (0.92-0.95)e

    		From T2D to CMMReference0.87 (0.70-1.08)1.01 (0.84-1.21)0.98 (0.82-1.18)0.91 (0.66-1.25)1.12 (0.76-1.64)1.00 (0.96-1.05)

    		From IHD to CMMReference0.96 (0.78-1.18)0.84 (0.69-1.02)0.95 (0.80-1.14)0.74 (0.52-1.05)1.04 (0.70-1.55)0.97 (0.93-1.02)

    		From stroke to CMMReference0.94 (0.79-1.10)0.89 (0.76-1.04)0.84 (0.72-0.98)i0.96 (0.75-1.22)1.09 (0.78-1.53)0.98 (0.94-1.01)

    		From T2D to mortalityReference0.80 (0.71-0.90)e0.86 (0.77-0.95)f0.87 (0.79-0.97)f1.03 (0.87-1.21)1.08 (0.86-1.36)0.99 (0.96-1.01)

    		From IHD to mortalityReference0.82 (0.62-1.08)0.98 (0.77-1.25)0.90 (0.70-1.16)1.30 (0.91-1.86)0.84 (0.41-1.70)1.01 (0.95-1.08)

    		From stroke to mortalityReference1.09 (0.93-1.28)1.05 (0.90-1.22)1.01 (0.86-1.17)0.78 (0.59-1.04)0.77 (0.48-1.23)0.98 (0.94-1.02)

    		From CMM to mortalityReference0.95 (0.75-1.21)0.92 (0.75-1.15)1.00 (0.81-1.24)0.92 (0.63-1.34)1.08 (0.66-1.76)1.00 (0.95-1.05)

    aVPA: vigorous PA.

    bMVPA: moderate to vigorous PA.

    cHR: hazard ratio.

    dThe models were adjusted for age, sex, ethnicity, socioeconomic status, BMI, household income, study center region, education group, smoking status, alcohol drinking status, and PA amount. Model A included 5 transitions from free of CMD to FCMD, then to CMM, and finally to mortality (Figure 1A), and model B included 11 transitions by including specific FCMD (Figure 1B).

    eP<.001.

    fP<.01.

    gT2D: type 2 diabetes.

    hIHD: ischemic heart disease.

    iP<.05.

    Subgroup Analyses

    Several important findings were involved in the subgroup analyses of PA amount, and details are presented in Table 3. First, lower PA (<600 MET min/wk) accompanied by lower PA intensity, that is, >0 to 0.25 of VPA to MVPA, was not significantly associated with a decreased risk of any transition compared with no VPA. Second, the participants with a greater proportion of VPA to MPA were highly associated with a reduced risk of transitions from free of CMD to FCMD and mortality regardless of the amount of PA. Third, higher PA intensity was associated with a decreased risk of transitions from free of CMD to T2D and stroke for the participants with the recommended amount of PA (no less than 600 MET min/wk) and IHD for the participants under the threshold of the recommended amount of PA (<600 MET min/wk). These findings were similar when using the ordinal scale of PA intensity.

    A significant effect of modification related to age, sex, PA amount, BMI, smoking, and alcohol drinking status was found among at least 1 transition (Table 4; Tables S4 and S5 in Multimedia Appendix 1). The protective effect of higher PA intensity on the transition from free of CMD to FCMD was larger among younger participants, participants with overweight, and previous or current smokers. Specifically, the decreased risk of the transitions from free of CMD to IHD and stroke associated with higher PA intensity was only found in previous or current smokers. Male participants, current or previous smokers, excessive alcohol drinkers, and participants with more PA could have more benefits of higher PA intensity for reducing mortality from free of CMD. In addition, the protective effect of higher PA intensity on the transitions from FCMD to mortality was more pronounced among the current or previous smokers. Younger populations aged ≤60 years could benefit from higher PA intensity when having CMM.

    Table 3. Associations of physical activity (PA) intensity with transitions from free of cardiometabolic disease (CMD) to first occurrence of CMD (FCMD), cardiometabolic multimorbidity (CMM), and mortality by PA amount.
    TransitionsPA intensity: the proportion of VPAa to MVPAb, HRc (95% CI)

    		0>0 to 0.25>0.25 to 0.5>0.5 to 0.75>0.75 to <11Ordinal scale
    <600 METd min/wk

    		Model Ae


    		From free of CMD to FCMDReference0.96 (0.87-1.06)0.88 (0.83-0.94)f0.89 (0.83-0.95)f0.89 (0.78-1.02)1.04 (0.94-1.14)0.98 (0.96-0.99)g


    		From free of CMD to mortalityReference0.91 (0.76-1.07)0.85 (0.76-0.94)g0.76 (0.67-0.85)f0.69 (0.53-0.88)g0.87 (0.73-1.04)0.94 (0.91-0.96)f


    		From FCMD to CMMReference1.28 (0.97-1.69)0.82 (0.66-1.01)0.75 (0.59-0.96)h1.16 (0.75-1.80)0.93 (0.68-1.27)0.96 (0.92-1.00)


    		From FCMD to mortalityReference1.07 (0.83-1.37)0.97 (0.82-1.14)0.90 (0.74-1.08)1.08 (0.74-1.57)0.91 (0.70-1.19)0.98 (0.95-1.02)


    		From CMM to mortalityReference0.77 (0.40-1.51)0.97 (0.61-1.54)1.15 (0.70-1.89)0.82 (0.26-2.56)1.33 (0.74-2.39)1.03 (0.94-1.13)

    		Model Be


    		From free of CMD to T2DiReference0.94 (0.79-1.12)0.81 (0.73-0.91)f0.90 (0.81-1.02)0.87 (0.69-1.10)1.14 (0.97-1.34)0.98 (0.96-1.01)


    		From free of CMD to IHDjReference0.93 (0.81-1.07)0.90 (0.83-0.98)h0.87 (0.80-0.96)g0.90 (0.75-1.08)1.03 (0.90-1.18)0.98 (0.96-1.00)h


    		From free of CMD to strokeReference1.09 (0.85-1.39)0.99 (0.85-1.16)0.94 (0.79-1.12)0.90 (0.64-1.28)0.85 (0.64-1.12)0.98 (0.94-1.01)


    		From free of CMD to mortalityReference0.91 (0.76-1.07)0.85 (0.76-0.94)g0.76 (0.67-0.85)f0.69 (0.54-0.88)g0.87 (0.73-1.04)0.94 (0.91-0.96)f


    		From T2D to CMMReference1.07 (0.62-1.83)0.89 (0.61-1.31)0.75 (0.49-1.17)1.33 (0.63-2.83)1.01 (0.60-1.70)0.98 (0.90-1.06)


    		From IHD to CMMReference1.33 (0.82-2.14)0.81 (0.54-1.20)0.82 (0.54-1.24)0.57 (0.18-1.80)0.88 (0.51-1.55)0.95 (0.87-1.03)


    		From stroke to CMMReference0.94 (0.54-1.63)0.76 (0.53-1.08)0.72 (0.48-1.08)0.99 (0.44-2.22)0.80 (0.46-1.39)0.93 (0.86-1.00)


    		From T2D to mortalityReference0.85 (0.57-1.25)0.81 (0.64-1.02)0.81 (0.62-1.05)1.41 (0.90-2.19)1.00 (0.71-1.40)0.98 (0.93-1.03)


    		From IHD to mortalityReference2.60 (1.46-4.64)g0.61 (0.32-1.16)0.62 (0.29-1.34)0.64 (0.16-2.61)1.10 (0.45-2.71)0.93 (0.81-1.06)


    		From stroke to mortalityReference1.43 (0.90-2.29)1.41 (1.06-1.88)h1.24 (0.87-1.75)0.70 (0.29-1.71)0.93 (0.49-1.75)1.04 (0.97-1.12)


    		From CMM to mortalityReference0.81 (0.38-1.73)1.15 (0.71-1.88)1.30 (0.76-2.21)1.18 (0.38-3.72)1.53 (0.78-3.00)1.08 (0.98-1.20)
    600-1200 MET min/wk

    		Model Ae


    		From free of CMD to FCMDReference0.88 (0.81-0.95)f0.88 (0.83-0.94)f0.91 (0.85-0.97) g0.95 (0.87-1.04)0.96 (0.84-1.09)0.98 (0.97-1.00)h


    		From free of CMD to mortalityReference0.95 (0.84-1.07)0.89 (0.80-0.99)h0.85 (0.77-0.95)g0.80 (0.68-0.94)g0.93 (0.75-1.17)0.96 (0.93-0.98)g


    		From FCMD to CMMReference0.86 (0.67-1.09)0.98 (0.81-1.20)0.99 (0.81-1.20)0.86 (0.63-1.17)1.39 (0.95-2.03)1.01 (0.96-1.06)


    		From FCMD to mortalityReference0.89 (0.72-1.09)0.92 (0.77-1.09)0.92 (0.77-1.09)0.97 (0.76-1.25)0.98 (0.68-1.42)0.99 (0.95-1.03)


    		From CMM to mortalityReference0.84 (0.49-1.44)0.97 (0.64-1.46)1.02 (0.68-1.54)1.20 (0.64-2.27)0.97 (0.45-2.12)1.02 (0.92-1.12)

    		Model Be


    		From free of CMD to T2DReference0.77 (0.66-0.89)f0.72 (0.63-0.81)f0.84 (0.75-0.95)g0.87 (0.74-1.04)0.92 (0.72-1.18)0.96 (0.93-0.99)h


    		From free of CMD to IHDReference0.90 (0.81-1.00)h0.94 (0.86-1.02)0.97 (0.89-1.06)1.03 (0.91-1.16)1.05 (0.87-1.25)1.00 (0.98-1.03)


    		From free of CMD to strokeReference1.04 (0.87-1.25)0.97 (0.83-1.14)0.84 (0.71-1.00)h0.89 (0.70-1.13)0.71 (0.48-1.06)0.95 (0.91-0.99)h


    		From free of CMD to mortalityReference0.95 (0.84-1.07)0.89 (0.80-0.99)h0.86 (0.77-0.95)g0.80 (0.68-0.94)g0.94 (0.75-1.18)0.96 (0.93-0.98)g


    		From T2D to CMMReference1.09 (0.70-1.72)0.90 (0.59-1.36)1.05 (0.71-1.53)0.56 (0.26-1.21)1.43 (0.66-3.10)0.98 (0.89-1.08)


    		From IHD to CMMReference0.95 (0.57-1.59)1.08 (0.71-1.65)1.17 (0.78-1.75)1.02 (0.54-1.93)1.63 (0.75-3.55)1.05 (0.96-1.16)


    		From stroke to CMMReference0.77 (0.52-1.14)0.70 (0.50-0.99)h0.92 (0.67-1.26)0.83 (0.52-1.34)1.50 (0.86-2.62)1.00 (0.92-1.08)


    		From T2D to mortalityReference0.75 (0.57-1.00)0.81 (0.64-1.02)0.83 (0.65-1.04)1.02 (0.75-1.40)1.19 (0.77-1.85)0.99 (0.93-1.05)


    		From IHD to mortalityReference0.45 (0.20-1.01)0.96 (0.57-1.63)0.86 (0.48-1.52)1.09 (0.51-2.34)0.76 (0.18-3.14)1.00 (0.87-1.15)


    		From stroke to mortalityReference1.01 (0.70-1.44)0.94 (0.69-1.30)0.98 (0.70-1.36)0.74 (0.42-1.29)0.14 (0.02-1.03)0.94 (0.86-1.02)


    		From CMM to mortalityReference0.62 (0.32-1.21)0.72 (0.43-1.22)1.02 (0.65-1.61)1.29 (0.64-2.60)0.90 (0.36-2.25)1.01 (0.90-1.13)
    >1200 MET min/wk

    		Model Ae


    		From free of CMD to FCMDReference0.91 (0.87-0.96)f0.92 (0.88-0.97)g0.91 (0.86-0.95)f0.85 (0.79-0.91)f0.86 (0.75-0.99)h0.97 (0.96-0.98)f


    		From free of CMD to mortalityReference0.83 (0.76-0.90)f0.79 (0.73-0.86)f0.75 (0.69-0.81)f0.67 (0.59-0.75)f0.62 (0.48-0.80)f0.92 (0.90-0.93)f


    		From FCMD to CMMReference0.88 (0.76-1.03)1.03 (0.89-1.20)0.93 (0.80-1.07)1.11 (0.90-1.36)0.95 (0.60-1.52)1.01 (0.97-1.05)


    		From FCMD to mortalityReference0.93 (0.82-1.06)0.92 (0.81-1.04)0.95 (0.84-1.07)0.91 (0.76-1.09)1.14 (0.80-1.62)0.99 (0.96-1.02)


    		From CMM to mortalityReference1.07 (0.80-1.44)0.89 (0.66-1.19)0.93 (0.70-1.25)0.77 (0.48-1.23)1.02 (0.37-2.78)0.95 (0.88-1.03)

    		Model Be


    		From free of CMD to T2DReference0.79 (0.71-0.87)f0.86 (0.78-0.94)g0.80 (0.73-0.88)f0.71 (0.62-0.82)f0.84 (0.64-1.09)0.95 (0.93-0.97)f


    		From free of CMD to IHDReference0.98 (0.91-1.05)0.98 (0.92-1.05)0.99 (0.93-1.06)0.93 (0.85-1.02)0.97 (0.81-1.16)0.99 (0.98-1.01)


    		From free of CMD to strokeReference0.93 (0.82-1.04)0.86 (0.76-0.96)h0.82 (0.73-0.93)g0.82 (0.69-0.96)h0.62 (0.42-0.91)h0.94 (0.91-0.97)f


    		From free of CMD to mortalityReference0.83 (0.76-0.90)f0.79 (0.73-0.86)f0.75 (0.69-0.81)f0.67 (0.59-0.75)f0.62 (0.48-0.80)f0.92 (0.90-0.93)f


    		From T2D to CMMReference0.75 (0.54-1.03)1.04 (0.78-1.38)0.97 (0.73-1.29)0.94 (0.61-1.44)1.13 (0.49-2.60)1.02 (0.95-1.10)


    		From IHD to CMMReference0.83 (0.62-1.12)0.73 (0.54-0.98)h0.86 (0.65-1.13)0.62 (0.38-1.01)1.05 (0.46-2.39)0.94 (0.87-1.02)


    		From stroke to CMMReference1.04 (0.81-1.33)1.05 (0.83-1.34)0.89 (0.70-1.13)1.05 (0.75-1.48)1.18 (0.60-2.34)0.98 (0.92-1.05)


    		From T2D to mortalityReference0.86 (0.72-1.02)0.94 (0.79-1.11)0.96 (0.81-1.12)1.03 (0.82-1.30)1.15 (0.73-1.82)1.02 (0.97-1.06)


    		From IHD to mortalityReference0.74 (0.49-1.10)1.06 (0.74-1.53)0.95 (0.66-1.36)1.47 (0.91-2.37)0.44 (0.06-3.18)1.06 (0.96-1.17)


    		From stroke to mortalityReference1.11 (0.87-1.41)0.99 (0.78-1.27)1.00 (0.79-1.26)0.82 (0.56-1.21)1.27 (0.59-2.73)0.98 (0.92-1.04)


    		From CMM to mortalityReference0.87 (0.62-1.20)0.78 (0.57-1.07)0.79 (0.58-1.09)0.64 (0.38-1.07)0.66 (0.21-2.10) 0.92 (0.84-1.00)

    aVPA: vigorous PA.

    bMVPA: moderate to vigorous PA.

    cHR: hazard ratio.

    dMET: metabolic equivalent task.

    eThe models were adjusted for age, sex, ethnicity, socioeconomic status, BMI, household income, study center region, education group, smoking status, alcohol drinking status, and PA amount. Model A included 5 transitions from free of CMD to FCMD, then to CMM, and finally to mortality (Figure 1A), and model B included 11 transitions by including specific FCMD (Figure 1B).

    fP<.001.

    gP<.01.

    hP<.05.

    iT2D: type 2 diabetes.

    jIHD: ischemic heart disease.

    Table 4. Subgroup analyses for the associations of physical activity (PA) intensity with transitions from free of cardiometabolic disease (CMD) to first occurrence of CMD (FCMD), cardiometabolic multimorbidity (CMM), and mortality.
    Factors for subgroup analysesModel Aa, HRb (95% CI)

    		From free of CMD to FCMDFrom free of CMD to mortalityFrom FCMD to CMMFrom FCMD to mortalityFrom CMM to mortality
    Age (years)

    		≤600.95 (0.94-0.96)c0.92 (0.90-0.94)c0.97 (0.93-1.00)0.96 (0.93-1.00)d0.89 (0.81-0.98)d

    		>600.97 (0.96-0.98)c0.94 (0.93-0.96)c0.98 (0.95-1.01)0.98 (0.95-1.00)1.05 (0.99-1.11)
    Sex

    		Male0.97 (0.96-0.98)c0.92 (0.91-0.94)c1.01 (0.98-1.04)0.98 (0.96-1.01)1.03 (0.98-1.10)

    		Female0.97 (0.95-0.98)c0.96 (0.94-0.98)c0.99 (0.95-1.03)1.01 (0.98-1.04)0.97 (0.89-1.06)
    BMI (kg/m2)

    		<250.99 (0.97-1.00)0.93 (0.91-0.95)c0.98 (0.93-1.04)0.97 (0.94-1.01)0.93 (0.83-1.04)

    		≥250.97 (0.96-0.98)c0.94 (0.92-0.95)c0.99 (0.97-1.02)0.99 (0.96-1.01)1.02 (0.97-1.08)
    Smoking status

    		Never0.99 (0.97-1.00)e0.95 (0.93-0.96)c1.00 (0.97-1.04)1.01 (0.98-1.04)0.99 (0.92-1.07)

    		Previous or current0.96 (0.95-0.97)c0.92 (0.91-0.94)c0.98 (0.95-1.02)0.96 (0.94-0.99)e1.02 (0.96-1.08)
    Alcohol drinking status

    		≤1-3 times/wk0.97 (0.96-0.98)c0.94 (0.93-0.96)c0.99 (0.96-1.02)0.99 (0.97-1.01)0.98 (0.93-1.04)

    		Daily or almost daily0.98 (0.96-0.99)e0.91 (0.89-0.93)c1.01 (0.96-1.07)0.97 (0.93-1.01)1.08 (0.97-1.19)

    aThe models were adjusted for age, sex, ethnicity, socioeconomic status, BMI, household income, study center region, education group, smoking status, alcohol drinking status, and PA amount. Age, sex, BMI, smoking status, and alcohol drinking status were not included in the models for the subgroup analyses. Model A included 5 transitions from free of CMD to FCMD, then to CMM, and finally to mortality (Figure 1A). PA intensity refers to the proportion of vigorous PA to moderate to vigorous PA, and an ordinal scale of PA intensity was used in the subgroup analyses.

    bHR: hazard ratio.

    cP<.001.

    dP<.05.

    eP<.01.

    Sensitivity Analysis

    We did not find substantial changes for the associations of PA intensity with the transitions from free of CMD to FCMD, then to CMM, and finally to mortality by performing additional analyses (Table S6 in Multimedia Appendix 1) using different time intervals (0.5 y, 1 y, 2 y, 3 y, and 5 y) for the participants entering different transitions on the same day, excluding the participants who entered different transitions on the same day, excluding FCMD in the first 2-year follow-up, excluding the participants with cancer, and excluding the participants with missing values at baseline for the covariates, which revealed robust estimates in this study.


    Principal Findings

    This is the first prospective cohort study using large-scale population–based data to explore the associations of PA intensity with different transitions from free of CMD, then to CMM, and finally to mortality. This study reported the effect of the proportion of VPA to MVPA on the incidence, progression, and prognosis of CMM using multistate models, and the principal findings are discussed next. Compared with the participants with no VPA, the participants with >0.75 to <1 of VPA to MVPA had the lowest risk of transitions from free of CMD to FCMD and mortality regardless of model A or B. The protective effect of higher PA intensity on the transitions from free of CMD to T2D (P<.001) and from T2D to mortality (P<.001) was statistically significant, which revealed the importance of PA intensity for the transitions of T2D. More PA and greater intensity had a synergistic effect on decreasing the risk of transitions from free of CMD to FCMD and mortality. Male participants, younger adults, participants with a higher BMI, current or previous smokers, and excessive alcohol drinkers could obtain more benefits from higher PA intensity for the lower risk of at least 1 transition from free of CMD, then to CMM, and finally to mortality.

    Interpretations, Implications, and Comparisons With Existing Literature

    In line with previous studies focusing on PA amount, this study had similar findings that meeting the recommendations of PA amount could significantly decrease the risk of FCMD, CMM, and mortality, regardless of whether the traditional Cox proportional hazards regression model or multistate model was used [23-30]. This study also provided some evidence for the additional benefits of more PA (>1200 MET min/wk) for FCMD, CMM, and mortality. It is worth noting that more PA did not provide a lower risk of mortality when including CMM in the consideration of estimates from the multistate model. The aforementioned findings might be explained by the fact that the participants with CMM might have cardiovascular organic lesions and the benefits from more PA might be offset.

    In line with previous studies [31-34], this study also found that higher PA intensity was significantly associated with all-cause mortality. In addition, this study added new evidence to recent knowledge that a greater proportion of VPA to MVPA (>0.75 to <1) could provide more benefits, including a decreased risk of 27% and 13% for the transitions from free of CMD to mortality and FCMD, respectively. Simultaneously, it was noted that no strong evidence was observed that a higher proportion of VPA to MVPA was associated with a lower risk of transition from free of CMD to IHD, which indicated that a suitable intensity was more effective for preventing IHD than no VPA. Another important finding in this study was that median PA intensity (the proportion of VPA to MVPA >0 to 0.75) was associated with a lower risk of transition from T2D to mortality, which suggests that stronger interventions of higher PA intensity for the participants with T2D are necessary to decrease all-cause mortality. In addition, we did not find that higher PA intensity was associated with other transitions related to CMM, which emphasizes that higher PA intensity at baseline plays an important role in the primary and secondary prevention for CMM and has a weaker role in the prognosis of CMM.

    A national cohort study of >400,000 US adults reported a decreased risk of all-cause mortality associated with the synergistic effect of more PA and greater intensity [32]. This study reported similar results for the associations of an interactive effect of PA amount and intensity on transitions from free of CMD to mortality. The aforementioned associations were also significant in the transition from free of CMD to FCMD, which not only emphasized the importance of PA amount but also highlighted the importance of higher PA intensity for healthy outcomes and the development of CMM.

    Inconsistent with a previous study reporting no interactions for the associations of sex with all-cause mortality [31,32], this study found that male participants could benefit more from higher PA intensity for reducing mortality from the free of CMD status. In line with the study by Wang et al [32], we also found significant interactions of current or previous smoking status and PA intensity with all-cause mortality. These differences might be caused by the different models used in this study. Instead of traditional Cox proportional hazard models used in previous studies, this study used the multistate models, which introduced a competing risk for all-cause mortality and could more validly show the transitions from free of CMD to mortality. In addition, this study provided additional evidence for identifying sensitive populations for other transitions in the incidence, progression, and prognosis of CMM, which could help develop preventive, targeted strategies for sensitive populations in the transitions.

    Strengths and Limitations

    This study has several strengths. First, this study used multistate models considering the competing risk for all-cause mortality to assess the associations of PA intensity, namely the proportion of VPA to MVPA with the transitions from free of CMD to FCMD, then to CMM, and finally to mortality. Second, this study used a large-scale population–based cohort, which allowed us to explore the associations among different transitions using the prospective design. Third, long-term follow-ups of UKB in this study could provide a sufficient duration to observe the incidence, progression, and prognosis of CMM. Certain limitations should be approached with caution when interpreting the results of this study. First, the PA amount and intensity were self-reported, and more studies using portable equipment are needed to verify these associations. In addition, we only captured the baseline characteristics of PA in this study. Further studies should focus on the effects of the trajectory of PA on the transitions. In addition, although UKB had a low recruitment rate [35] and a limited age group from 37 to 73 years, a previous study proved that the associations of PA with mortality were not materially changed [45].

    Clinical Implications and Conclusions

    This study suggests that higher PA intensity is an effective measure for preventing CMM and mortality in the early period of CMM development. Higher PA intensity accompanied by higher PA levels could provide the lowest risk of all-cause mortality and FCMD. Targeted populations including male participants, younger adults, people with overweight, current or previous smokers, and excessive alcohol drinkers could obtain more benefits from higher PA intensity for FCMD and all-cause mortality. Relevant interventions related to higher PA intensity should be performed.

    Acknowledgments

    The authors would like to thank the participants of the UK Biobank. This research was conducted using the UK Biobank Resource under application number 91536. B-PL was supported by the National Natural Science Foundation of China (NSFC; #82103954) and Shandong Provincial Natural Science Foundation (#ZR2021QH310). C-XJ was supported by the NSFC (#81761128033). The funding sources were not involved in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the paper for publication.

    Data Availability

    UK Biobank data can be accessed by submitting an application through the UK Biobank website.

    Authors' Contributions

    B-PL and C-XJ conceptualized the research question. B-PL conducted data analysis and managed the data. B-PL, J-HZ, L-PW, Z-YZ, and XW drafted the paper. All authors provided critical feedback on the paper at various stages and approved the final version of the paper.

    Conflicts of Interest

    None declared.

    Multimedia Appendix 1

    Study flow, design, covariates, and additional analyses.

    DOCX File , 459 KB
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    ‎
    CMD: cardiometabolic disease
    CMM: cardiometabolic multimorbidity
    FCMD: first occurrence of cardiometabolic disease
    HR: hazard ratio
    IHD: ischemic heart disease
    MET: metabolic equivalent task
    MPA: moderate physical activity
    MVPA: moderate to vigorous physical activity
    PA: physical activity
    SES: socioeconomic status
    T2D: type 2 diabetes
    UKB: UK Biobank
    VPA: vigorous physical activity

    Edited by A Mavragani, T Sanchez; submitted 04.03.23; peer-reviewed by S Robinson, T Liu; comments to author 12.05.23; revised version received 02.06.23; accepted 10.08.23; published 25.09.23.

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    ©Bao-Peng Liu, Jia-Hui Zhu, Li-Peng Wan, Zhen-Yu Zhao, Xinting Wang, Cun-Xian Jia. Originally published in JMIR Public Health and Surveillance (https://publichealth.jmir.org), 25.09.2023.

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