Muscle size-strength relationship including ultrasonographic echo intensity and voluntary activation level of a muscle group

Archives of Gerontology and Geriatrics
Ryota AkagiRyoichi Ema

Abstract

This study aimed to investigate the relationship between muscle volume (MV) and joint torque for the plantar flexors (PF) in 40 young (20 men and 20 women) and 33 elderly (19 men and 14 women) individuals in consideration of the voluntary activation (VA) of PF and ratio of intramuscular adipose tissue within PF assessed by ultrasonographic echo intensity (EI). MV was estimated from the thickness of PF on ultrasonography and the lower leg length using a prediction equation previously reported. The maximal voluntary contraction torque of isometric plantar flexion was measured as TQMVC. VA (%) was assessed using the twitch interpolation technique, and maximal joint torque calculated by TQMVC/VA × 100 was adopted as TQ100%. The correlation coefficients between MV and TQMVC (r = 0.518) and between MV and TQ100% (r = 0.602) were both significant, with the latter being significantly higher than the former. When a stepwise multiple regression analysis using MV and EI as independent variables and TQ100% as the dependent variable was performed, MV (β = 0.554) and EI (β = -0.203) were both selected as significant contributors for estimating TQ100%. Additionally, the residual errors of TQ100% using the multiple regression equation (indepen...Continue Reading

Citations

May 31, 2018·Current Opinion in Critical Care·Wilhelmus G P M LooijaardPeter J M Weijs
May 30, 2019·Journal of Applied Biomechanics·Danny M PinciveroBrittany N Byrd
Nov 7, 2019·Medicine and Science in Sports and Exercise·Vianney RozandAshleigh E Smith
Apr 18, 2020·Cranio : the Journal of Craniomandibular Practice·Fateme BokaeeSedighe Sadat Naimi
May 26, 2020·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Matt S StockDavid C Phan
Oct 2, 2019·Frontiers in Physiology·Patrick J OwenDaniel L Belavy
Jan 12, 2020·European Journal of Applied Physiology·Elyse HucteauThomas Cattagni
Jan 3, 2021·European Geriatric Medicine·Stany PerkisasAnne-Marie De Cock
Aug 11, 2020·Experimental Gerontology·Akash U BaliMatt S Stock
Nov 23, 2020·European Journal of Applied Physiology·Matt S Stock, Brennan J Thompson
Aug 8, 2021·Journal of Biomechanics·Curran ReddyXudong Zhang

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