Body composition associations with muscle strength in older adults living in Auckland, New Zealand
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Date
2021-05-28
Open Access Location
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
PLOS
Rights
CC BY 4.0
Abstract
BACKGROUND: Aging is associated with decreases in muscle strength and simultaneous changes in body composition, including decreases in muscle mass, muscle quality and increases in adiposity.
METHODS: Adults (n = 369; 236 females) aged 65-74 years living independently were recruited from the cross-sectional Researching Eating Activity and Cognitive Health (REACH) study. Body fat percentage and appendicular skeletal muscle mass (ASM) (sum of lean mass in the arms and legs) were assessed using Dual-energy X-ray Absorptiometry (Hologic, QDR Discovery A). The ASM index was calculated by ASM (kilograms) divided by height (meters) squared. Isometric grip strength was measured using a hand grip strength dynamometer (JAMAR HAND).
RESULTS: Linear regression analyses revealed that muscle strength was positively associated with the ASM index (R2 = 0.431, p < 0.001). When exploring associations between muscle strength and muscle mass according to obesity classifications (obesity ≥30% males; ≥40% females), muscle mass was a significant predictor of muscle strength in non-obese participants. However, in participants with obesity, muscle mass was no longer a significant predictor of muscle strength.
CONCLUSIONS: Body fat percentage should be considered when measuring associations between muscle mass and muscle strength in older adults.
Description
Copyright: © 2021 Hiol et al.
Keywords
Absorptiometry, Photon, Aged, Body Composition, Body Mass Index, Cross-Sectional Studies, Female, Hand Strength, Humans, Linear Models, Male, Muscle Strength, Muscle, Skeletal, New Zealand, Obesity
Citation
Hiol AN, von Hurst PR, Conlon CA, Mugridge O, Beck KL. (2021). Body composition associations with muscle strength in older adults living in Auckland, New Zealand.. PLoS One. 16. 5. (pp. e0250439-).