A Behavioral Mechanism of How Increases in Leg Strength Improve Old Adults’ Gait Speed

We examined a behavioral mechanism of how increases in leg strength improve healthy old adults’ gait speed. Leg press strength training improved maximal leg press load 40% (p = 0.001) and isometric strength in 5 group of leg muscles 32% (p = 0.001) in a randomly allocated intervention group of healt...

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Autores principales: Uematsu, Azusa, Tsuchiya, Kazushi, Kadono, Norio, Kobayashi, Hirofumi, Kaetsu, Takamasa, Hortobágyi, Tibor, Suzuki, Shuji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Research Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4195722/
https://www.ncbi.nlm.nih.gov/pubmed/25310220
http://dx.doi.org/10.1371/journal.pone.0110350
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author Uematsu, Azusa
Tsuchiya, Kazushi
Kadono, Norio
Kobayashi, Hirofumi
Kaetsu, Takamasa
Hortobágyi, Tibor
Suzuki, Shuji
author_facet Uematsu, Azusa
Tsuchiya, Kazushi
Kadono, Norio
Kobayashi, Hirofumi
Kaetsu, Takamasa
Hortobágyi, Tibor
Suzuki, Shuji
author_sort Uematsu, Azusa
collection PubMed
description We examined a behavioral mechanism of how increases in leg strength improve healthy old adults’ gait speed. Leg press strength training improved maximal leg press load 40% (p = 0.001) and isometric strength in 5 group of leg muscles 32% (p = 0.001) in a randomly allocated intervention group of healthy old adults (age 74, n = 15) but not in no-exercise control group (age 74, n = 8). Gait speed increased similarly in the training (9.9%) and control (8.6%) groups (time main effect, p = 0.001). However, in the training group only, in line with the concept of biomechanical plasticity of aging gait, hip extensors and ankle plantarflexors became the only significant predictors of self-selected and maximal gait speed. The study provides the first behavioral evidence regarding a mechanism of how increases in leg strength improve healthy old adults’ gait speed.
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spelling pubmed-41957222014-10-15 A Behavioral Mechanism of How Increases in Leg Strength Improve Old Adults’ Gait Speed Uematsu, Azusa Tsuchiya, Kazushi Kadono, Norio Kobayashi, Hirofumi Kaetsu, Takamasa Hortobágyi, Tibor Suzuki, Shuji PLoS One Research Article We examined a behavioral mechanism of how increases in leg strength improve healthy old adults’ gait speed. Leg press strength training improved maximal leg press load 40% (p = 0.001) and isometric strength in 5 group of leg muscles 32% (p = 0.001) in a randomly allocated intervention group of healthy old adults (age 74, n = 15) but not in no-exercise control group (age 74, n = 8). Gait speed increased similarly in the training (9.9%) and control (8.6%) groups (time main effect, p = 0.001). However, in the training group only, in line with the concept of biomechanical plasticity of aging gait, hip extensors and ankle plantarflexors became the only significant predictors of self-selected and maximal gait speed. The study provides the first behavioral evidence regarding a mechanism of how increases in leg strength improve healthy old adults’ gait speed. Public Library of Science 2014-10-13 /pmc/articles/PMC4195722/ /pubmed/25310220 http://dx.doi.org/10.1371/journal.pone.0110350 Text en © 2014 Uematsu et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Uematsu, Azusa
Tsuchiya, Kazushi
Kadono, Norio
Kobayashi, Hirofumi
Kaetsu, Takamasa
Hortobágyi, Tibor
Suzuki, Shuji
A Behavioral Mechanism of How Increases in Leg Strength Improve Old Adults’ Gait Speed
title A Behavioral Mechanism of How Increases in Leg Strength Improve Old Adults’ Gait Speed
title_full A Behavioral Mechanism of How Increases in Leg Strength Improve Old Adults’ Gait Speed
title_fullStr A Behavioral Mechanism of How Increases in Leg Strength Improve Old Adults’ Gait Speed
title_full_unstemmed A Behavioral Mechanism of How Increases in Leg Strength Improve Old Adults’ Gait Speed
title_short A Behavioral Mechanism of How Increases in Leg Strength Improve Old Adults’ Gait Speed
title_sort behavioral mechanism of how increases in leg strength improve old adults’ gait speed
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4195722/
https://www.ncbi.nlm.nih.gov/pubmed/25310220
http://dx.doi.org/10.1371/journal.pone.0110350
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