中国中老年人群体力活动和认知功能的关系:膳食的调节作用

The relationship between physical activity and cognitive function among the middle-aged and older adults in China:the moderating effect of diet

目的研究中老年人体力活动和认知功能关系,以及膳食健康水平对其关系的影响,为开展综合行为干预提供依据。方法基于中国健康与营养调查(China health and nutrition survey,CHNS)数据,纳入3584名基线年龄≥55岁的研究对象,使用线性混合效应模型分析体力活动水平与认知功能的关联性,使用分层分析探讨不同膳食健康水平组中该关联性是否存在差异。结果校正人口学因素、生活方式因素和慢性病情况后,总体体力活动水平与整体认知功能得分差异有统计学意义(β=0.050,95%CI:0.035~0.065);分层分析发现,在膳食健康水平较低的组中,总体体力活动水平与整体认知功能得分关联程度更强(β=0.094,95%CI:0.054~0.133)。结论对于中国中老年人群,特别是膳食健康水平较低的人群,需要更加关注通过加强体力活动来保护认知功能。

Objective To investigate the relationship between physical activity and cognitive function among the middle-aged and older adults in China,as well as the impact of diet on this relationship.The findings will provide a basis for implementing comprehensive behavioral interventions.Methods Based on the China health and nutrition survey(CHNS),3584 subjects with a baseline age of 55 years and above were included.A linear mixed-effects model was used to examine the association between physical activity and cognitive function,and a stratified analysis was conducted to determine whether such association varies between different groups of diet.Results After adjusting for demographic factors,lifestyle factors,and chronic disease conditions,there was a significant association between overall physical activity and total cognitive function scores(β=0.050,95%CI:0.035-0.065).Stratified analyses showed that in the group with lower health level of diet,the overall level of physical activity was more strongly associated with the total cognitive function score(β=0.094,95%CI:0.054-0.133).Conclusions More attention should be paid to protecting cognitive function by increasing physical activity level for middle-aged and elderly Chinese,especially those with low dietary health level.