Attenuated activation of knee extensor muscles during fast contractions in older men and women
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ORIGINAL ARTICLE
Attenuated activation of knee extensor muscles during fast contractions in older men and women MinHyuk Kwon1,2 · Jonathon W. Senefeld1,3 · Sandra K. Hunter1 Received: 11 February 2020 / Accepted: 30 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Aim Reduced physical function and increased risk of falls in older adults are accompanied by age-related reductions in torque development of leg muscles, although the mechanisms and potential sex differences are not understood. Purpose To determine the mechanistic origins (neural vs. muscular) for the age-related reduction in torque development, we compared the peak rates of torque development (RTD) during electrically-evoked and fast voluntary contractions of the knee extensors between young and older men and women. Methods Sets of single- and double-pulse electrical stimulations evoked contractions of the knee extensor muscles in 20 young (23.0 ± 0.8 years; 10 women) and 20 older adults (78.2 ± 1.5 years; 10 women), followed by voluntary isometric knee extension contractions with torque development as fast as possible that matched the torque during electrically-evoked contraction (10–40% maximal torque). Results Peak RTD during fast-voluntary contractions was 41% less than electrically-evoked contractions (p
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