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Advanced Age Redistributes Positive but Not Negative Leg Joint Work during Walking

INTRODUCTION: Advanced age brings a distal-to-proximal redistribution of positive joint work during walking that is relevant to walking performance and economy. It is unclear whether negative joint work is similarly redistributed in old age. Negative work can affect positive work through elastic ene...

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Autores principales: WAANDERS, JEROEN B., HORTOBÁGYI, TIBOR, MURGIA, ALESSIO, DEVITA, PAUL, FRANZ, JASON R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Lippincott Williams & Wilkins 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6430599/
https://www.ncbi.nlm.nih.gov/pubmed/30395049
http://dx.doi.org/10.1249/MSS.0000000000001828
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author WAANDERS, JEROEN B.
HORTOBÁGYI, TIBOR
MURGIA, ALESSIO
DEVITA, PAUL
FRANZ, JASON R.
author_facet WAANDERS, JEROEN B.
HORTOBÁGYI, TIBOR
MURGIA, ALESSIO
DEVITA, PAUL
FRANZ, JASON R.
author_sort WAANDERS, JEROEN B.
collection PubMed
description INTRODUCTION: Advanced age brings a distal-to-proximal redistribution of positive joint work during walking that is relevant to walking performance and economy. It is unclear whether negative joint work is similarly redistributed in old age. Negative work can affect positive work through elastic energy return in gait. We determined the effects of age, walking speed, and grade on positive and negative joint work in young and older adults. METHODS: Bilateral ground reaction force and marker data were collected from healthy young (age = 22.5 yr, n = 18) and older (age = 76.0 yr, n = 22) adults walking on a split-belt instrumented treadmill at 1.1, 1.4, and 1.7 m·s(−1) at each of three grades (0%, 10%, and −10%). Subjects also performed maximal voluntary eccentric, isometric, and concentric contractions for the knee extensors (120°·s(−1), 90°·s(−1), and 0°·s(−1)) and plantarflexors (90°·s(−1), 30°·s(−1), and 0°·s(−1)). RESULTS: Compared with young adults, older adults exhibited a distal-to-proximal redistribution of positive leg joint work during level (P < 0.001) and uphill (P < 0.001) walking, with larger differences at faster walking speeds. However, the distribution of negative joint work was unaffected by age during level (P = 0.150) and downhill (P = 0.350) walking. Finally, the age-related loss of maximal voluntary knee extensor (P < 0.001) and plantarflexor (P = 0.001) strength was smaller during an eccentric contraction versus concentric contraction for the knee extensors (P < 0.001) but not for the plantarflexors (P = 0.320). CONCLUSION: The distal-to-proximal redistribution of positive joint work during level and uphill walking is absent for negative joint work during level and downhill walking. Exercise prescription should focus on improving ankle muscle function while preserving knee muscle function in older adults trying to maintain their independence.
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spelling pubmed-64305992019-04-15 Advanced Age Redistributes Positive but Not Negative Leg Joint Work during Walking WAANDERS, JEROEN B. HORTOBÁGYI, TIBOR MURGIA, ALESSIO DEVITA, PAUL FRANZ, JASON R. Med Sci Sports Exerc Clinical Sciences INTRODUCTION: Advanced age brings a distal-to-proximal redistribution of positive joint work during walking that is relevant to walking performance and economy. It is unclear whether negative joint work is similarly redistributed in old age. Negative work can affect positive work through elastic energy return in gait. We determined the effects of age, walking speed, and grade on positive and negative joint work in young and older adults. METHODS: Bilateral ground reaction force and marker data were collected from healthy young (age = 22.5 yr, n = 18) and older (age = 76.0 yr, n = 22) adults walking on a split-belt instrumented treadmill at 1.1, 1.4, and 1.7 m·s(−1) at each of three grades (0%, 10%, and −10%). Subjects also performed maximal voluntary eccentric, isometric, and concentric contractions for the knee extensors (120°·s(−1), 90°·s(−1), and 0°·s(−1)) and plantarflexors (90°·s(−1), 30°·s(−1), and 0°·s(−1)). RESULTS: Compared with young adults, older adults exhibited a distal-to-proximal redistribution of positive leg joint work during level (P < 0.001) and uphill (P < 0.001) walking, with larger differences at faster walking speeds. However, the distribution of negative joint work was unaffected by age during level (P = 0.150) and downhill (P = 0.350) walking. Finally, the age-related loss of maximal voluntary knee extensor (P < 0.001) and plantarflexor (P = 0.001) strength was smaller during an eccentric contraction versus concentric contraction for the knee extensors (P < 0.001) but not for the plantarflexors (P = 0.320). CONCLUSION: The distal-to-proximal redistribution of positive joint work during level and uphill walking is absent for negative joint work during level and downhill walking. Exercise prescription should focus on improving ankle muscle function while preserving knee muscle function in older adults trying to maintain their independence. Lippincott Williams & Wilkins 2019-04 2018-11-01 /pmc/articles/PMC6430599/ /pubmed/30395049 http://dx.doi.org/10.1249/MSS.0000000000001828 Text en Copyright © 2018 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American College of Sports Medicine. This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND) (http://creativecommons.org/licenses/by-nc-nd/4.0/) , where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.
spellingShingle Clinical Sciences
WAANDERS, JEROEN B.
HORTOBÁGYI, TIBOR
MURGIA, ALESSIO
DEVITA, PAUL
FRANZ, JASON R.
Advanced Age Redistributes Positive but Not Negative Leg Joint Work during Walking
title Advanced Age Redistributes Positive but Not Negative Leg Joint Work during Walking
title_full Advanced Age Redistributes Positive but Not Negative Leg Joint Work during Walking
title_fullStr Advanced Age Redistributes Positive but Not Negative Leg Joint Work during Walking
title_full_unstemmed Advanced Age Redistributes Positive but Not Negative Leg Joint Work during Walking
title_short Advanced Age Redistributes Positive but Not Negative Leg Joint Work during Walking
title_sort advanced age redistributes positive but not negative leg joint work during walking
topic Clinical Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6430599/
https://www.ncbi.nlm.nih.gov/pubmed/30395049
http://dx.doi.org/10.1249/MSS.0000000000001828
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