Tian Yu Wang1, Yili Wu2, Tong Wang1, Yujie Li1, Dongfeng Zhang1. 1. Dept. of Epidemiology and Health Statistics, Medical College, Qingdao University, Qingdao, China. 2. Dept. of Epidemiology and Health Statistics, Medical College, Qingdao University, Qingdao, China. Electronic address: wuyili@qdu.edu.cn.
Abstract
BACKGROUND: Longitudinal studies on sleep duration and grip strength decline are limited. This study aimed to evaluate the associations of baseline sleep duration with follow-up grip strength and grip strength changeover time among a large sample of middle-aged and older Chinese. METHODS: Data from China Health and Retirement Longitudinal Study, CHARLS (2011-2015), were analyzed. Hand grip strength was measured by dynamometers twice with 4 years interval. Baseline self-reported nighttime sleep duration was collected by questionnaire. Basic demographics, life habits and health status were considered as potential confounders. Multivariate linear regression models with quadratic function and mixed-effects regression models were fitted. RESULTS: Inverted U-shaped associations occurred between baseline sleep duration and follow-up grip strength for both males (βlinear = 1.011, plinear = 0.002; βquadratic = -0.061, pquadratic = 0.014) and females (βlinear = 0.605, plinear = 0.005, βquadratic = -0.041, pquadratic = 0.019). Compared to the sleep duration of 7 h, significant interactions of <5 hours-by-time (γ= - 0.966 with SEE = 0.442, p = .029) in males as well as 5-7 hours-by-time (γ= - 0.717 with SEE = 0.294, p = .015), 7-9 hours-by-time (γ= - 0.632 with SEE = 0.311, p = .042) and >9 hours-by-time (γ= - 1.567 with SEE = 0.560, p = .005) in females were found. CONCLUSION: For both males and females, compared to the intermediate sleep duration, shorter or longer sleep may predict the weaker follow-up grip strength and the faster rate of hand grip strength decline over time.
BACKGROUND: Longitudinal studies on sleep duration and grip strength decline are limited. This study aimed to evaluate the associations of baseline sleep duration with follow-up grip strength and grip strength changeover time among a large sample of middle-aged and older Chinese. METHODS: Data from China Health and Retirement Longitudinal Study, CHARLS (2011-2015), were analyzed. Hand grip strength was measured by dynamometers twice with 4 years interval. Baseline self-reported nighttime sleep duration was collected by questionnaire. Basic demographics, life habits and health status were considered as potential confounders. Multivariate linear regression models with quadratic function and mixed-effects regression models were fitted. RESULTS: Inverted U-shaped associations occurred between baseline sleep duration and follow-up grip strength for both males (βlinear = 1.011, plinear = 0.002; βquadratic = -0.061, pquadratic = 0.014) and females (βlinear = 0.605, plinear = 0.005, βquadratic = -0.041, pquadratic = 0.019). Compared to the sleep duration of 7 h, significant interactions of <5 hours-by-time (γ= - 0.966 with SEE = 0.442, p = .029) in males as well as 5-7 hours-by-time (γ= - 0.717 with SEE = 0.294, p = .015), 7-9 hours-by-time (γ= - 0.632 with SEE = 0.311, p = .042) and >9 hours-by-time (γ= - 1.567 with SEE = 0.560, p = .005) in females were found. CONCLUSION: For both males and females, compared to the intermediate sleep duration, shorter or longer sleep may predict the weaker follow-up grip strength and the faster rate of hand grip strength decline over time.
Authors: David Stevens; Sarah Appleton; Andrew D Vincent; Yohannes Melaku; Sean Martin; Tiffany Gill; Catherine Hill; Andrew Vakulin; Robert Adams; Gary Wittert Journal: Nat Sci Sleep Date: 2020-11-10