Relationships between quadriceps and hamstring muscles isokinetic profile for sprinters with and without hamstring injuries

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Relationships between quadriceps and hamstring muscles isokinetic profile for sprinters with and without hamstring injuries

 

Author: Tse, Chi-yan
Title: Relationships between quadriceps and hamstring muscles isokinetic profile for sprinters with and without hamstring injuries
Degree: M.Sc.
Year: 2005
Subject: Hong Kong Polytechnic University -- Dissertations
Muscle strength
Overuse injuries
Department: Dept. of Rehabilitation Sciences
Pages: ix, 71 leaves : col. ill. ; 0 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1818224
URI: http://theses.lib.polyu.edu.hk/handle/200/4843
Abstract: Hamstring strain injury is prevalent injury in sports activities involving sprinting and kicking. Etiology studies suggested that hamstring strain is a multi-factorial disorder. Although Muscle imbalance factor has been studied over few decades, well designed prospective hamstrings prevention studies are lacking. The purpose of this study was to investigate the relationship of quadriceps and hamstring isokinetic profile in sprinters with and without hamstring Strain injuries. Forty-four sprinters were recruited in the study; the subjects were divided in two groups. One group with history of unilateral hamstring strain injury, another group with no history of lower limb injury. The peak torque of quadriceps and hamstrings in both concentric and eccentric mode were measured by isokinetic dynamometer at the angular velocity of 60, 120, 180 and 240 degree per second. Hamstrings to quadriceps ratio (HQR) was calculated in both conventional and functional means at optimum angle and 5o, 10o, 15o, 20o of knee flexion for analysis. No significant difference was found between [1] the injured and uninjured leg of the previously injured group and [2] the injured group and uninjured group at all the speed and range tested, suggesting that there is no difference between the HQR among the injured and uninjured sprinters. Further research is required understanding of the association between HQR and hamstring strain injuries in sprinters.

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