Electromechanical delay of the hamstrings during eccentric muscle actions in males and females: Implications for non-contact ACL injuries

De Ste Croix, Mark B and Elnagar, Youssif O and Iga, John and James, David V and Ayala, Francisco (2015) Electromechanical delay of the hamstrings during eccentric muscle actions in males and females: Implications for non-contact ACL injuries. Journal of Electromyography and Kinesiology, 25 (6). pp. 901-906. ISSN 1050-6411

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Abstract

Sex differences in neuromuscular functioning has been proposed as one of the factors behind an increased relative risk of non-contact anterior cruciate ligament (ACL) injury in females. The aim of this study was to explore sex differences in electromechanical delay (EMD) of the hamstring muscles during eccentric muscle actions and during a range of movement velocities. This study recruited 110 participants (55 males, 55 females) and electromyography of the semitendinosus, semimembranosus and biceps femoris was determined during eccentric actions at 60, 120 and 240°/s. No significant sex differences were observed irrespective of muscle examined or movement velocity. Irrespective of sex EMD significantly increased with increasing movement velocity (P < 0.01). There was no significant difference in the EMD of the 3 muscles examined. Our findings suggest that during eccentric actions of the hamstrings that there are no sex differences, irrespective of movement velocity. This would suggest that other factors are probably responsible for the increased relative risk of non-contact ACL injury in females compared to males.

Item Type: Article
Article Type: Article
Uncontrolled Keywords: Electromechanical delay; Eccentric; Sex; Injury risk
Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure
G Geography. Anthropology. Recreation > GV Recreation Leisure > GV557 Sports
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Schools and Research Institutes > School of Sport & Exercise > Sport and Exercise
Research Priority Areas: Sport, Exercise, Health & Wellbeing
Depositing User: Anne Pengelly
Date Deposited: 30 Nov 2015 16:12
Last Modified: 04 Apr 2017 04:36
URI: http://eprints.glos.ac.uk/id/eprint/2869

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