A large analysis of middle-aged and older adults in China has added a compelling new piece of evidence to one of medicine’s most persistent questions: how much does simply moving your body protect your arteries? In a study published in BMC Public Health, researchers Jianyu Tang and Hongying Wang of Shanghai University of Sport examined the relationship between physical activity levels and a blood-based marker of atherosclerosis, the slow narrowing and stiffening of arteries that underlies heart attacks and strokes. Drawing on data from the China Health and Retirement Longitudinal Study, known as CHARLS, collected between 2011 and 2013, the team found that people who met the World Health Organization’s recommended activity threshold carried a measurably healthier lipid profile than their more sedentary peers, even after accounting for a long list of confounding factors.
The measure at the center of the study is the atherosclerosis index, a simple but informative calculation derived from a standard blood draw. It is computed by subtracting high-density lipoprotein cholesterol, the so-called good cholesterol that helps ferry fat out of the bloodstream, from total cholesterol, and then dividing that difference by the high-density lipoprotein value. The resulting number captures the balance between the cholesterol fractions that promote plaque formation in artery walls and the fraction that protects against it. A higher index suggests a greater burden of atherogenic lipid particles relative to protective ones, and therefore a higher theoretical risk of plaque accumulation over time. Because it integrates several lipid measures into a single value, the index is often used in epidemiological research as a practical proxy for cardiovascular risk, particularly in large population surveys where direct imaging of arteries is impractical.
To quantify physical activity, the researchers used the metabolic equivalent of task, or MET, a unit that expresses the energy cost of an activity relative to resting metabolism. Sitting quietly corresponds to roughly one MET, while brisk walking, farming, or vigorous chores can range from three to eight METs or more. By multiplying the intensity of each reported activity by the time spent doing it, the team calculated each participant’s total weekly activity in MET-minutes. Following WHO guidelines, participants who accumulated at least 600 MET-minutes per week, equivalent to about 150 minutes of moderate-intensity activity, were classified as sufficiently active, while everyone below that threshold was classified as insufficiently active. This approach allowed the investigators to test a question of direct public health relevance: does reaching the internationally recommended activity level make a visible difference in an artery-relevant biomarker?
The analytic sample comprised 2,196 CHARLS participants who had complete records for physical activity, lipid profiles, and the covariates needed for adjustment. CHARLS is a nationally representative longitudinal survey of Chinese residents aged 45 and older, and its combination of questionnaires, physical measurements, and blood sampling makes it unusually well suited for this kind of investigation. Because the study followed a multilevel design, the researchers were able to account for the fact that participants are nested within communities and regions, a structure that can otherwise distort standard statistical estimates when people in the same area share environments, diets, and healthcare access. Multilevel linear regression was used to estimate the association between sufficient activity and the atherosclerosis index, with the index also divided into quartiles for analyses of elevated values.
The headline result was consistent across models. In unadjusted analyses, participants with sufficient physical activity had an atherosclerosis index that was, on average, 0.207 units lower than those who were insufficiently active, a difference that was highly statistically significant. After the researchers adjusted for a full battery of potential confounders, the estimate barely moved, settling at 0.198 units lower, with a 95 percent confidence interval extending from 0.312 to 0.084 below the reference group. In epidemiological terms, the stability of the effect estimate between crude and fully adjusted models is reassuring, because it suggests the association is not being manufactured or masked by demographic and lifestyle differences between active and inactive participants. The p-value of 0.001 in the fully adjusted model indicates that a result this extreme would be very unlikely if no true association existed.
Perhaps the most striking finding came from the sensitivity analyses, which reframed the question in terms of odds. Participants who met the WHO-recommended activity level had 25 percent lower odds of falling into an elevated atherosclerosis index category compared with those who did not meet the recommendation, with an adjusted odds ratio of 0.75 and a confidence interval of 0.64 to 0.88. Because the confidence interval sits entirely below 1.0, the result is statistically robust at conventional thresholds. Translated into practical terms, hitting the minimum activity guideline, which many people can achieve with a daily brisk half-hour walk, was associated with a meaningful reduction in the likelihood of an adverse lipid balance, the biochemical substrate on which arterial plaque builds.
The researchers also probed whether the association held uniformly across different segments of the population. Subgroup analyses stratified participants by age, sex, marital status, and urban or rural residence, and the inverse relationship between activity and the atherosclerosis index was generally consistent in every stratum. Formal tests for interaction found no statistically significant differences between groups, meaning the data did not support the idea that the benefit of exercise is confined to, or amplified in, any particular demographic. For a country undergoing rapid aging and equally rapid shifts in diet and lifestyle, that uniformity matters: it suggests that activity-based prevention strategies need not be narrowly targeted to show benefit, though tailored programs may still be valuable for engagement and adherence.
Several technical features of the study strengthen its credibility. The use of a directed acyclic graph to guide covariate selection reflects a modern, transparent approach to deciding which variables to adjust for, reducing the risk of overadjustment or the introduction of bias through inappropriate controls. Depression status was assessed with the ten-item Center for Epidemiologic Studies Depression Scale, allowing the authors to account for mental health, which is known to correlate with both inactivity and cardiovascular risk. Sensitivity analyses, by definition, test whether conclusions survive alternative modeling assumptions, and in this study they did. The authors also declared no competing interests and reported no external funding for the analysis, and the underlying CHARLS data were collected with ethical approval from Peking University’s institutional review board and written informed consent from all participants.
As with any observational study, important caveats remain. The analysis demonstrates an association, not a proven causal effect, and it is possible that subclinical disease or other unmeasured factors influence both activity levels and lipid profiles. Physical activity was self-reported, a method that can introduce measurement error, and the study period of 2011 to 2013 captures a snapshot rather than lifelong habits. Still, the biological plausibility of the finding is strong: regular exercise is known to raise high-density lipoprotein cholesterol, improve insulin sensitivity, reduce inflammation, and enhance the function of the endothelial cells lining blood vessels, all mechanisms that would be expected to lower an atherosclerosis index. The consistency of the present results with the broader literature on activity and cardiovascular health lends further weight to the interpretation that movement itself, rather than some correlate of it, drives the benefit.
The practical message for the public is refreshingly simple. The 600 MET-minute weekly threshold used in the study corresponds to the WHO’s minimum recommendation of 150 minutes of moderate activity, or 75 minutes of vigorous activity, per week, and the new findings suggest that even reaching this floor is associated with a healthier arterial lipid profile in middle-aged and older adults. In a nation where cardiovascular disease has become the leading cause of death and where aging populations face rising rates of metabolic syndrome, promoting regular physical activity is among the most scalable and low-cost interventions available. The study’s authors conclude that their findings support making regular physical activity an important component of cardiovascular disease prevention strategies, and the numbers behind that conclusion, a 25 percent reduction in the odds of an elevated atherosclerosis index, give clinicians and policymakers a concrete target to communicate. For individuals, the takeaway is that the walk taken today is an investment in arteries that will still flow freely decades from now.
Subject of Research: The association between physical activity and the atherosclerosis index in middle-aged and older Chinese adults
Article Title: Physical activity and atherosclerosis index: a multilevel analysis based on CHARLS 2011–2013
Article References: Tang, J., & Wang, H. (2026). Physical activity and atherosclerosis index: a multilevel analysis based on CHARLS 2011–2013. BMC Public Health. https://doi.org/10.1186/s12889-026-28919-4
Image Credits: AI Generated
DOI: 10.1186/s12889-026-28919-4
Keywords: physical activity, atherosclerosis index, CHARLS, cardiovascular health, cholesterol, HDL, WHO guidelines, MET-minutes, lipid profile, public health, aging, China
News Source: Ophelia Keating. (October 13, 2026). Moving More, Clogging Less: Exercise Tied to Healthier Arteries in Chinese Adults. Scienmag.
