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Optimum Angle of Force Production Temporarily Changes Due to Growth in Male Adolescence

The peak increase in lean mass in adolescents is delayed from peak height velocity (PHV), and muscle flexibility temporarily decreases as bones grow. If the decrease in muscle flexibility is caused by muscle elongation, the relationship between the exerted torque and the joint angle could change in...

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Autores principales: Saeki, Junya, Iizuka, Satoshi, Sekino, Hiroaki, Suzuki, Ayahiro, Maemichi, Toshihiro, Torii, Suguru
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7823696/
https://www.ncbi.nlm.nih.gov/pubmed/33401578
http://dx.doi.org/10.3390/children8010020
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author Saeki, Junya
Iizuka, Satoshi
Sekino, Hiroaki
Suzuki, Ayahiro
Maemichi, Toshihiro
Torii, Suguru
author_facet Saeki, Junya
Iizuka, Satoshi
Sekino, Hiroaki
Suzuki, Ayahiro
Maemichi, Toshihiro
Torii, Suguru
author_sort Saeki, Junya
collection PubMed
description The peak increase in lean mass in adolescents is delayed from peak height velocity (PHV), and muscle flexibility temporarily decreases as bones grow. If the decrease in muscle flexibility is caused by muscle elongation, the relationship between the exerted torque and the joint angle could change in adolescents. The purpose of this study was to investigate the change in the optimum angle of force production due to growth. Eighty-eight healthy boys were recruited for this study. Isokinetic knee extension muscle strength of the dominant leg was recorded. The outcome variable was the knee flexion angle when maximal knee extension torque was produced (optimum angle). The age at which PHV occurred was estimated from subjects’ height history. We calculated the difference between the age at measurement and the expected age of PHV (growth age). A regression analysis was performed with the optimal angle of force exertion as the dependent variable and the growth age as the independent variable. Then, a polynomial formula with the lowest p-value was obtained. A significant cubic regression was obtained between optimum angle and growth age. The results suggest that the optimum angle of force production temporarily changes in male adolescence.
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spelling pubmed-78236962021-01-24 Optimum Angle of Force Production Temporarily Changes Due to Growth in Male Adolescence Saeki, Junya Iizuka, Satoshi Sekino, Hiroaki Suzuki, Ayahiro Maemichi, Toshihiro Torii, Suguru Children (Basel) Communication The peak increase in lean mass in adolescents is delayed from peak height velocity (PHV), and muscle flexibility temporarily decreases as bones grow. If the decrease in muscle flexibility is caused by muscle elongation, the relationship between the exerted torque and the joint angle could change in adolescents. The purpose of this study was to investigate the change in the optimum angle of force production due to growth. Eighty-eight healthy boys were recruited for this study. Isokinetic knee extension muscle strength of the dominant leg was recorded. The outcome variable was the knee flexion angle when maximal knee extension torque was produced (optimum angle). The age at which PHV occurred was estimated from subjects’ height history. We calculated the difference between the age at measurement and the expected age of PHV (growth age). A regression analysis was performed with the optimal angle of force exertion as the dependent variable and the growth age as the independent variable. Then, a polynomial formula with the lowest p-value was obtained. A significant cubic regression was obtained between optimum angle and growth age. The results suggest that the optimum angle of force production temporarily changes in male adolescence. MDPI 2021-01-03 /pmc/articles/PMC7823696/ /pubmed/33401578 http://dx.doi.org/10.3390/children8010020 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Saeki, Junya
Iizuka, Satoshi
Sekino, Hiroaki
Suzuki, Ayahiro
Maemichi, Toshihiro
Torii, Suguru
Optimum Angle of Force Production Temporarily Changes Due to Growth in Male Adolescence
title Optimum Angle of Force Production Temporarily Changes Due to Growth in Male Adolescence
title_full Optimum Angle of Force Production Temporarily Changes Due to Growth in Male Adolescence
title_fullStr Optimum Angle of Force Production Temporarily Changes Due to Growth in Male Adolescence
title_full_unstemmed Optimum Angle of Force Production Temporarily Changes Due to Growth in Male Adolescence
title_short Optimum Angle of Force Production Temporarily Changes Due to Growth in Male Adolescence
title_sort optimum angle of force production temporarily changes due to growth in male adolescence
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7823696/
https://www.ncbi.nlm.nih.gov/pubmed/33401578
http://dx.doi.org/10.3390/children8010020
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