Angle-specific hamstring-to-quadriceps ratio: A comparison of football players and recreationally active males
It is currently unclear how football participation affects knee-joint muscle balance, which is widely considered a risk factor for hamstrings injury. This study compared the angle-specific functional hamstring-to-quadriceps (H:Q) ratio (hamstrings eccentric torque as a ratio of quadriceps concentric torque at the same knee-joint angle) of football players with recreationally active controls. Ten male footballers and 14 controls performed maximal voluntary isometric and isovelocity concentric and eccentric contractions (60, 240 and 400°/s) of the knee extensors and flexors. Gaussian fitting to the raw torque values was used to interpolate torque values for knee-joint angles of 100-160° (60°/s, 105-160° (240°/s and 115-145° (400°/s. The angle-specific functional H:Q ratio was calculated from the knee flexors eccentric and knee extensors concentric torque at the same velocity and angle. No differences were found for the angle-specific functional H:Q ratio between groups, at any velocity. Quadriceps and hamstrings strength relative to body mass of footballers and controls was similar for all velocities, except concentric knee flexor strength at 400°/s (footballers +40%; P < 0.01). In previously uninjured football players, there was no intrinsic muscle imbalance and therefore the high rate of hamstring injuries seen in this sport may be due to other risk factors and/or simply regular exposure to a high-risk activity.
© Copyright 2015 Journal of Sports Sciences. Taylor & Francis. Kaikki oikeudet pidätetään.
Aiheet: | jalkapallo lihas lihasfysiologia voima, vahvuus |
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Aihealueet: | urheilukilpailut junioriurheilu |
DOI: | 10.1080/02640414.2014.942680 |
Julkaisussa: | Journal of Sports Sciences |
Julkaistu: |
2015
|
Vuosikerta: | 33 |
Numero: | 3 |
Sivuja: | 309-319 |
Julkaisutyypit: | artikkeli |
Kieli: | englanti (kieli) |
Taso: | kehittynyt |