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Effect of Hip Flexion Angle on the Hamstring to Quadriceps Strength Ratio

The purpose of this study was to compare the hamstring to quadriceps ratio (H:Q) obtained from three different hip flexion angles. Seventy-three young athletes performed maximum isokinetic concentric and eccentric knee extension and flexion efforts at 60 °·s(−1) and 240 °·s(−1) from hip flexion angl...

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Autores principales: Kellis, Eleftherios, Ellinoudis, Athanasios, Kofotolis, Nikolaos
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6409775/
https://www.ncbi.nlm.nih.gov/pubmed/30781438
http://dx.doi.org/10.3390/sports7020043
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author Kellis, Eleftherios
Ellinoudis, Athanasios
Kofotolis, Nikolaos
author_facet Kellis, Eleftherios
Ellinoudis, Athanasios
Kofotolis, Nikolaos
author_sort Kellis, Eleftherios
collection PubMed
description The purpose of this study was to compare the hamstring to quadriceps ratio (H:Q) obtained from three different hip flexion angles. Seventy-three young athletes performed maximum isokinetic concentric and eccentric knee extension and flexion efforts at 60 °·s(−1) and 240 °·s(−1) from hip flexion angles of 90°, 60°, and 120°. The conventional (concentric to concentric), functional (eccentric to concentric) and mixed (eccentric at 30 °·s(−1) to concentric torque at 240 °·s(−1)) H:Q torque ratios and the electromyographic activity from the rectus femoris and biceps femoris were analyzed. The conventional H:Q ratios and the functional H:Q ratios at 60 °·s(−1) did not significantly differ between the three testing positions (p > 0.05). In contrast, testing from the 90° hip flexion angle showed a greater functional torque ratio at 240 °·s(−1) and a mixed H:Q torque ratio compared with the other two positions (p < 0.05). The hip flexion angle did not influence the recorded muscle activation signals (p > 0.05). For the range of hip flexion angles tested, routine isokinetic assessment of conventional H:Q ratio and functional H:Q ratio at slow speed is not angle-dependent. Should assessment of the functional H:Q ratio at fast angular velocity or the mixed ratio is required, then selection of hip flexion angle is important.
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spelling pubmed-64097752019-03-29 Effect of Hip Flexion Angle on the Hamstring to Quadriceps Strength Ratio Kellis, Eleftherios Ellinoudis, Athanasios Kofotolis, Nikolaos Sports (Basel) Article The purpose of this study was to compare the hamstring to quadriceps ratio (H:Q) obtained from three different hip flexion angles. Seventy-three young athletes performed maximum isokinetic concentric and eccentric knee extension and flexion efforts at 60 °·s(−1) and 240 °·s(−1) from hip flexion angles of 90°, 60°, and 120°. The conventional (concentric to concentric), functional (eccentric to concentric) and mixed (eccentric at 30 °·s(−1) to concentric torque at 240 °·s(−1)) H:Q torque ratios and the electromyographic activity from the rectus femoris and biceps femoris were analyzed. The conventional H:Q ratios and the functional H:Q ratios at 60 °·s(−1) did not significantly differ between the three testing positions (p > 0.05). In contrast, testing from the 90° hip flexion angle showed a greater functional torque ratio at 240 °·s(−1) and a mixed H:Q torque ratio compared with the other two positions (p < 0.05). The hip flexion angle did not influence the recorded muscle activation signals (p > 0.05). For the range of hip flexion angles tested, routine isokinetic assessment of conventional H:Q ratio and functional H:Q ratio at slow speed is not angle-dependent. Should assessment of the functional H:Q ratio at fast angular velocity or the mixed ratio is required, then selection of hip flexion angle is important. MDPI 2019-02-15 /pmc/articles/PMC6409775/ /pubmed/30781438 http://dx.doi.org/10.3390/sports7020043 Text en © 2019 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 Article
Kellis, Eleftherios
Ellinoudis, Athanasios
Kofotolis, Nikolaos
Effect of Hip Flexion Angle on the Hamstring to Quadriceps Strength Ratio
title Effect of Hip Flexion Angle on the Hamstring to Quadriceps Strength Ratio
title_full Effect of Hip Flexion Angle on the Hamstring to Quadriceps Strength Ratio
title_fullStr Effect of Hip Flexion Angle on the Hamstring to Quadriceps Strength Ratio
title_full_unstemmed Effect of Hip Flexion Angle on the Hamstring to Quadriceps Strength Ratio
title_short Effect of Hip Flexion Angle on the Hamstring to Quadriceps Strength Ratio
title_sort effect of hip flexion angle on the hamstring to quadriceps strength ratio
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6409775/
https://www.ncbi.nlm.nih.gov/pubmed/30781438
http://dx.doi.org/10.3390/sports7020043
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