The risk assessment of sleep duration on geriatric sarcopenia and its regulatory role in the effect of BMI index on geriatric sarcopenia based on the CHARLS database.
Abnormal sleep durations including sleep deprivation and oversleeping are linked to a heightened risk of sarcopenia among older adults, and sleep duration moderates the association between BMI and sarcopenia risk.
Key Findings
Results
All four abnormal types of sleep duration were significantly associated with geriatric sarcopenia.
Data were drawn from three waves of the China Health and Retirement Longitudinal Study (CHARLS): 2011, 2013, and 2015.
Both sleep deprivation and oversleeping (including mild and severe oversleeping) were examined as abnormal sleep duration categories.
Both logistic regression and Cox regression analyses were used to assess risk.
Subgroup analysis was conducted to enhance the stability of the results.
Results
Obesity was significantly associated with decreased risk of sarcopenia in the sufficient sleep and sleep deprivation groups after full covariate adjustment.
In the sufficient sleep group, obesity was associated with decreased sarcopenia risk (Adjusted HR = 0.25, 95% CI: 0.10–0.64, P < 0.001).
In the sleep deprivation group, obesity was associated with decreased sarcopenia risk (Adjusted HR = 0.13, 95% CI: 0.03–0.53, P = 0.004).
A third adjusted HR of 0.26 (95% CI: 0.10–0.66, P = 0.005) was also reported for obesity and decreased sarcopenia risk.
In the oversleeping group, the associations between BMI categories and sarcopenia were not statistically significant.
Results
Underweight was associated with increased sarcopenia risk and overweight with decreased sarcopenia risk in specific sleep duration groups.
Associations between underweight and increased sarcopenia risk were observed in sufficient sleep, sleep deprivation, and mild oversleeping groups.
Associations between overweight and decreased sarcopenia risk were similarly observed in sufficient sleep, sleep deprivation, and mild oversleeping groups.
In the severe oversleeping group, associations between BMI categories (underweight and overweight) and sarcopenia were not significant.
These relationships were especially pronounced in females with abnormal sleep duration except for severe oversleeping.
Results
The association between obesity and decreased sarcopenia risk was especially notable in adults aged over 65 with sleep deprivation.
Subgroup analysis was conducted to examine age-specific effects.
Adults aged over 65 with sleep deprivation showed a particularly strong inverse association between obesity and sarcopenia risk.
The finding highlights an age-dependent moderating role of sleep duration in the BMI–sarcopenia relationship.
Full covariate adjustment was applied in these subgroup analyses.
Results
Sleep duration moderates the relationship between BMI and geriatric sarcopenia, with the moderating effect varying by sleep duration category.
The study explicitly aimed to explore the 'regulatory effect of sleep duration on the association between BMI and sarcopenia.'
The moderating role differed across sleep categories: significant BMI–sarcopenia associations were found in sufficient sleep, sleep deprivation, and mild oversleeping groups but not in the severe oversleeping group.
Both logistic regression and Cox regression were employed to evaluate this moderating role.
The CHARLS database provided a longitudinal, nationally representative Chinese older adult sample across three waves (2011, 2013, 2015).
What This Means
This research used data from a large, long-term study of older Chinese adults (the CHARLS database, covering 2011, 2013, and 2015) to examine how sleep duration relates to sarcopenia — the age-related loss of muscle mass and strength — and whether sleep duration changes the relationship between body weight (BMI) and sarcopenia risk. The study found that both sleeping too little (sleep deprivation) and sleeping too much (oversleeping, whether mild or severe) were associated with a higher risk of developing sarcopenia in older adults. Additionally, being underweight was linked to greater sarcopenia risk, while being overweight or obese was linked to lower sarcopenia risk, but these relationships depended heavily on how much the person slept.
Specifically, the protective effect of obesity against sarcopenia was strongest in people who either slept a sufficient amount or who were sleep-deprived, and was particularly notable in adults over age 65 who were sleep-deprived. Among those who severely overslept, the connections between body weight categories and sarcopenia largely disappeared. The protective effects of overweight and the harmful effects of underweight on sarcopenia risk were especially evident in women with abnormal sleep durations, except for severe oversleeping.
This research suggests that sleep duration is not just independently linked to muscle health in older adults, but also shapes how body weight affects sarcopenia risk. This means that interventions targeting both sleep quality and body weight may need to consider each other to be most effective. The findings highlight the importance of maintaining healthy sleep patterns alongside appropriate body weight as part of strategies to prevent muscle loss in aging populations.
Chen Y, Shi X, Liu N, Feng Z. (2026). The risk assessment of sleep duration on geriatric sarcopenia and its regulatory role in the effect of BMI index on geriatric sarcopenia based on the CHARLS database.. PloS one. https://doi.org/10.1371/journal.pone.0345257