The association between upper limb function, physical exercise, and cognitive ability among empty-nest elderly in China: A cross-sectional study based on CLHLS.
Among Chinese empty-nest elderly, restricted upper limb function is positively associated with the risk of cognitive impairment, while regular physical exercise is negatively associated with this risk, with physical exercise accounting for a minor portion (5.95%) of the statistical association between upper limb function and cognitive ability.
Key Findings
Results
Restricted upper limb function was significantly associated with increased risk of cognitive impairment in empty-nest elderly.
Multivariable-adjusted analysis showed OR=2.55 (95% CI: 1.95–3.29) for cognitive impairment among those with restricted upper limb function.
The sample consisted of 5,060 empty-nest elderly with a mean age of 78.60 ± 10.31 years.
Upper limb function was categorized as normal or restricted and assessed via questionnaire.
The study used data from the 2018 Chinese Longitudinal Healthy Longevity Survey (CLHLS).
Results
Regular physical exercise was significantly associated with reduced risk of cognitive impairment in empty-nest elderly.
Multivariable-adjusted analysis showed OR=0.77 (95% CI: 0.62–0.95) for cognitive impairment among those who exercised regularly.
Physical exercise was assessed as a binary variable (yes/no) via questionnaire.
The association remained significant after adjustment for multiple covariates.
Results
The prevalence of cognitive impairment among the empty-nest elderly sample was 14.92%.
755 out of 5,060 participants had cognitive impairment.
Participants were aged 60 and above and did not co-reside with their children.
Cognitive ability was categorized as normal or impaired and assessed via questionnaire.
Results
Physical exercise partially mediated the association between upper limb function and cognitive ability, but accounted for only a minor proportion of the total effect.
Physical exercise accounted for 5.95% of the total effect of upper limb function on cognitive impairment.
The average causal mediation effect (ACME) was 0.0121 (95% CI: 0.0074–0.0172).
Bootstrap-based mediation effect analysis was used.
The authors noted: 'Given the small effect size, this pathway should be interpreted as a minor statistical contributor rather than a dominant mechanism.'
Results
Drinking status significantly modified the associations of both upper limb function and physical exercise with cognitive impairment.
Both interactions with drinking status were statistically significant (P for interaction < 0.05 for both upper limb function and physical exercise).
Stronger effects were observed in non-drinkers compared to drinkers.
Subgroup analyses were conducted to examine potential effect modification.
Methods
The study defined 'empty-nest elderly' as older adults aged 60 and above who did not live with their children, based on household structure information from the CLHLS.
A total of 5,060 empty-nest elderly were included in the final analysis.
Data were drawn from the 2018 wave of the Chinese Longitudinal Healthy Longevity Survey (CLHLS).
The cross-sectional design means no causal relationships can be established; all reported associations are statistical in nature.
Analyses included multivariable logistic regression, restricted cubic spline curves, Bootstrap-based mediation analysis, and subgroup analysis.
What This Means
This research suggests that among older Chinese adults who live without their children (referred to as 'empty-nest elderly'), having limited use of their upper limbs is strongly linked to a higher chance of experiencing cognitive impairment, while regularly engaging in physical exercise is linked to a lower chance. The study analyzed data from over 5,000 people aged 60 and older using a large national survey from China conducted in 2018. About 15% of the participants showed signs of cognitive impairment. People with restricted upper limb function were roughly 2.5 times more likely to have cognitive impairment compared to those with normal function, and regular exercisers had about a 23% lower risk compared to non-exercisers.
The study also investigated whether physical exercise might help explain the connection between upper limb function and cognitive health — that is, whether people with better arm function exercise more, which in turn benefits their cognition. The analysis found that exercise did play a small mediating role, but it only accounted for about 6% of the statistical link between upper limb function and cognition. This means that most of the association between upper limb function and cognitive impairment operates through other pathways not captured in this study. Additionally, the relationships were stronger among people who did not drink alcohol compared to those who did.
This research suggests that monitoring upper limb function in older adults living alone or without family support could be a useful way to identify those at higher risk for cognitive decline. Encouraging physical activity in this population may offer some protective benefit for cognitive health, though the effect through this particular pathway appears modest. Because this was a cross-sectional study — meaning it captured data at a single point in time — it cannot prove that restricted arm function or lack of exercise directly causes cognitive impairment, only that these factors are statistically associated.
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Zhou Q, Jiang J, Zhang C, Ma Y. (2026). The association between upper limb function, physical exercise, and cognitive ability among empty-nest elderly in China: A cross-sectional study based on CLHLS.. PloS one. https://doi.org/10.1371/journal.pone.0351211