社区高龄老年人下肢肌力与步速的关系：柔韧和动态平衡的链式中介作用

doi:10.3969/j.issn.1006-9771.2023.06.004

Abstract

Abstract:

Objective To investigate the relationship between lower limb muscle strength and walking speed in older adults, and to analyze the mediating role of flexibility and dynamic balance.
Methods From November to December, 2021, a total of 155 older adults at the Shanghai Senior Sports and Health Home were included. Their basic health information was collected, and the lower limb muscle strength, flexibility, dynamic balance and walking speed were tested. A mediated effects analysis was conducted.
Results There was a pairwise correlation among lower limb muscle strength, flexibility, dynamic balance and walking speed in older adults (r > 0.210, P < 0.01). In the mediated effects model, after controlling for age and gender, lower limb muscle strength did not directly predict walking speed in older adults (β = 0.029, P = 0.699), however, lower limb muscle strength could influence walking speed through the partial mediation of dynamic balance (effect = 0.0130, 95% CI 0.0073~0.0197) and the chain mediation of lower flexibility and dynamic balance (effect = 0.0019, 95% CI 0.0003~0.0043).
Conclusion Lower limb muscle strength can indirectly affect walking speed in older adults through the mediators of flexibility and dynamic balance, or the dynamic balance alone.

Key words: muscle strength, walking speed, flexibility, dynamic balance, older adults

CLC Number:

R592

TAN Xiaohuan, JIANG Guiping, HUANG Xinyi, WANG Dandan, ZHANG Lei, BU Qingguo, WU Xueping. Relationship between lower limb muscle strength and walk speed in community dwelling older adults: the chain mediating role of flexibility and dynamic balance[J]. 《Chinese Journal of Rehabilitation Theory and Practice》, 2023, 29(6): 646-653.

Figures/Tables 5

References 61

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性别	年龄/岁	身高/m	体质量/kg	体质量指数/(kg•m^-2)
男性	80.45±3.91	1.66±0.66	67.80±10.33	24.36±3.41
女性	78.57±3.49	1.55±0.65	60.17±9.37	24.51±4.30

变量	测量值	年龄	性别	TUGT	座椅体前屈	30sCST	步速
年龄/岁	79.460±3.804	1
性别(男= 1，女= 2)	1.530±0.501	-0.247^a	1
TUGT/s	8.057±2.199	0.318^a	-0.048	1
座椅体前屈/cm	-2.230±11.582	-0.225^a	0.380^a	-0.332^b	1
30sCST/个	15.410±4.971	-0.212^a	-0.052	-0.440^b	0.210^a	1
步速/m·s^-1	1.247±0.362	-0.225^a	-0.028	-0.570^b	0.218^a	0.289^b	1

变量		拟合指标			效应量
结果变量	预测变量	R	R²	F值	β	t值	P值
步速	30sCST	0.338	0.114	6.532	0.245	3.117^b	0.002
	年龄				-0.061	-2.312^a	0.022
	性别				-0.180	-0.772	0.440
座椅体前屈	年龄	0.456	0.208	13.217	-0.088	-1.146	0.253
	性别				0.374	4.985^b	< 0.001
	30sCST				0.208	2.801^b	0.005
TUGT	年龄	0.541	0.292	15.527	0.210	2.881^b	0.004
	性别				0.080	1.047	0.296
	30sCST				-0.340	-4.692^b	< 0.001
	座椅体前屈				-0.242	-3.146^b	0.002
步速	年龄	0.579	0.335	15.033	-0.061	-0.837	0.403
	性别				-0.088	-1.176	0.241
	30sCST				0.029	0.387	0.699
	座椅体前屈				0.057	0.740	0.460
	TUGT				-0.523	-6.586^b	< 0.001

项目	Effect	SE	95%CI	效应相对占比
总间接效应	0.0158	0.0036	0.0094~0.0235	88.27%
下肢肌力→柔韧→步速	0.0009	0.0012	-0.0010~0.0037	5.03%
下肢肌力→平衡→步速	0.0130	0.0032	0.0073~0.0197	72.63%
下肢肌力→柔韧→平衡→步速	0.0019	0.0010	0.0003~0.0043	10.61%
直接效应	0.0021	0.0055	-0.0087~0.0130	11.73%
总效应	0.0179	0.0057	0.0066~0.0293

Relationship between lower limb muscle strength and walk speed in community dwelling older adults: the chain mediating role of flexibility and dynamic balance

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