Cargando…
Relationship between Nordic hamstring strength and maximal voluntary eccentric, concentric and isometric knee flexion torque
Nordic hamstring exercise is performed to prevent knee flexor muscle strain injuries and used to assess their injury risks. However, what exactly Nordic hamstring strength indicates is not clear. We investigated the relationship between Nordic hamstring strength and maximal voluntary contraction (MV...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2022
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8880649/ https://www.ncbi.nlm.nih.gov/pubmed/35213652 http://dx.doi.org/10.1371/journal.pone.0264465 |
_version_ | 1784659266906357760 |
---|---|
author | Nishida, Satoru Nakamura, Masatoshi Kiyono, Ryosuke Sato, Shigeru Yasaka, Koki Yoshida, Riku Nosaka, Kazunori |
author_facet | Nishida, Satoru Nakamura, Masatoshi Kiyono, Ryosuke Sato, Shigeru Yasaka, Koki Yoshida, Riku Nosaka, Kazunori |
author_sort | Nishida, Satoru |
collection | PubMed |
description | Nordic hamstring exercise is performed to prevent knee flexor muscle strain injuries and used to assess their injury risks. However, what exactly Nordic hamstring strength indicates is not clear. We investigated the relationship between Nordic hamstring strength and maximal voluntary contraction (MVC) torque of the knee flexors measured by an isokinetic dynamometer. Sixteen healthy young men who had not experienced hamstring strain injuries participated in the study. In Nordic hamstring, each participant was instructed to lean forward as far as possible in 3 s (approximately 30°/s), and force at the ankle joint of the dominant leg was measured during the movement. The force was multiplied by lower leg length and converted into torque. MVC torque of the knee flexors was measured isometrically at 30°, 45°, 60°, and 90° knee flexion joint angles, and concentrically and eccentrically at 30°/s and 60°/s in 10°–90° knee flexion for the dominant leg in a prone position. Correlations among the dependent variables were assessed using Pearson’s correlation coefficients. Peak Nordic hamstring torque ranged 96.8–163.5 Nm, and peak MVC eccentric torque ranged 50.7–109.4 Nm at 30°/s and 59.2–121.2 Nm at 60°/s. No significant correlations were evident between the peak Nordic hamstring torque and peak eccentric knee flexion torque (r = 0.24–0.3, p = 0.26–0.4). This was also the case for the Nordic hamstring torque and MVC torque of isometric (r = −0.03–0.1, p = 0.71–0.92) and concentric contractions (r = 0.28–0.49, p = 0.053–0.29). These results show that Nordic hamstring strength is not associated with the knee flexor torque measured by an isokinetic dynamometer. It may be that other factors than static and dynamic hamstring strengths affect Nordic hamstring strength. |
format | Online Article Text |
id | pubmed-8880649 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-88806492022-02-26 Relationship between Nordic hamstring strength and maximal voluntary eccentric, concentric and isometric knee flexion torque Nishida, Satoru Nakamura, Masatoshi Kiyono, Ryosuke Sato, Shigeru Yasaka, Koki Yoshida, Riku Nosaka, Kazunori PLoS One Research Article Nordic hamstring exercise is performed to prevent knee flexor muscle strain injuries and used to assess their injury risks. However, what exactly Nordic hamstring strength indicates is not clear. We investigated the relationship between Nordic hamstring strength and maximal voluntary contraction (MVC) torque of the knee flexors measured by an isokinetic dynamometer. Sixteen healthy young men who had not experienced hamstring strain injuries participated in the study. In Nordic hamstring, each participant was instructed to lean forward as far as possible in 3 s (approximately 30°/s), and force at the ankle joint of the dominant leg was measured during the movement. The force was multiplied by lower leg length and converted into torque. MVC torque of the knee flexors was measured isometrically at 30°, 45°, 60°, and 90° knee flexion joint angles, and concentrically and eccentrically at 30°/s and 60°/s in 10°–90° knee flexion for the dominant leg in a prone position. Correlations among the dependent variables were assessed using Pearson’s correlation coefficients. Peak Nordic hamstring torque ranged 96.8–163.5 Nm, and peak MVC eccentric torque ranged 50.7–109.4 Nm at 30°/s and 59.2–121.2 Nm at 60°/s. No significant correlations were evident between the peak Nordic hamstring torque and peak eccentric knee flexion torque (r = 0.24–0.3, p = 0.26–0.4). This was also the case for the Nordic hamstring torque and MVC torque of isometric (r = −0.03–0.1, p = 0.71–0.92) and concentric contractions (r = 0.28–0.49, p = 0.053–0.29). These results show that Nordic hamstring strength is not associated with the knee flexor torque measured by an isokinetic dynamometer. It may be that other factors than static and dynamic hamstring strengths affect Nordic hamstring strength. Public Library of Science 2022-02-25 /pmc/articles/PMC8880649/ /pubmed/35213652 http://dx.doi.org/10.1371/journal.pone.0264465 Text en © 2022 Nishida et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Nishida, Satoru Nakamura, Masatoshi Kiyono, Ryosuke Sato, Shigeru Yasaka, Koki Yoshida, Riku Nosaka, Kazunori Relationship between Nordic hamstring strength and maximal voluntary eccentric, concentric and isometric knee flexion torque |
title | Relationship between Nordic hamstring strength and maximal voluntary eccentric, concentric and isometric knee flexion torque |
title_full | Relationship between Nordic hamstring strength and maximal voluntary eccentric, concentric and isometric knee flexion torque |
title_fullStr | Relationship between Nordic hamstring strength and maximal voluntary eccentric, concentric and isometric knee flexion torque |
title_full_unstemmed | Relationship between Nordic hamstring strength and maximal voluntary eccentric, concentric and isometric knee flexion torque |
title_short | Relationship between Nordic hamstring strength and maximal voluntary eccentric, concentric and isometric knee flexion torque |
title_sort | relationship between nordic hamstring strength and maximal voluntary eccentric, concentric and isometric knee flexion torque |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8880649/ https://www.ncbi.nlm.nih.gov/pubmed/35213652 http://dx.doi.org/10.1371/journal.pone.0264465 |
work_keys_str_mv | AT nishidasatoru relationshipbetweennordichamstringstrengthandmaximalvoluntaryeccentricconcentricandisometrickneeflexiontorque AT nakamuramasatoshi relationshipbetweennordichamstringstrengthandmaximalvoluntaryeccentricconcentricandisometrickneeflexiontorque AT kiyonoryosuke relationshipbetweennordichamstringstrengthandmaximalvoluntaryeccentricconcentricandisometrickneeflexiontorque AT satoshigeru relationshipbetweennordichamstringstrengthandmaximalvoluntaryeccentricconcentricandisometrickneeflexiontorque AT yasakakoki relationshipbetweennordichamstringstrengthandmaximalvoluntaryeccentricconcentricandisometrickneeflexiontorque AT yoshidariku relationshipbetweennordichamstringstrengthandmaximalvoluntaryeccentricconcentricandisometrickneeflexiontorque AT nosakakazunori relationshipbetweennordichamstringstrengthandmaximalvoluntaryeccentricconcentricandisometrickneeflexiontorque |