Bicep femoris voluntary activation deficits contribute to eccentric knee flexor weakness following intermittent running

Timmins, Ryan, Dear, Nuala, Opar, David, Williams, Morgan, & Shield, Anthony (2012) Bicep femoris voluntary activation deficits contribute to eccentric knee flexor weakness following intermittent running. In 14th Biennial Conference of the International Society of Electrophysiology and Kinesiology (ISEK 2012), 4-7 July 2012, Brisbane, QLD.

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INTRODUCTION: Hamstring strain injuries (HSI) are the predominant non-contact injury in many sports. Eccentric hamstring muscle weakness following intermittent running has been implicated within the aetiology of HSI. This weakness following intermittent running is often greater eccentrically than concentrically, however the cause of this unique, contraction mode specific phenomenon is unknown.

AIM: To determine if this preferential eccentric decline in strength is caused by declines in voluntary hamstring muscle activation.

METHODS: Fifteen recreationally active males completed 18 × 20m overground sprints. Maximal strength (concentric and eccentric knee flexor and concentric knee extensor) was determined isokinetically at the velocities of ±1800.s-1 and ±600.s- while hamstring muscle activation was assessed using surface electromyography, before and 15 minutes after the running protocol.

RESULTS: Overground intermittent running caused greater eccentric (27.2 Nm; 95% CI = 11.2 to 43.3; p=0.0001) than concentric knee flexor weakness (9.3 Nm; 95% CI = -6.7 to 25.3; P=0.6361). Following the overground running, voluntary activation levels of the lateral hamstrings showed a significant decline (0.08%; 95% CI = 0.045 to 0.120; P<0.0001). In comparison, medial hamstring activation showed no change following intermittent running.

CONCLUSION: Eccentric hamstring strength is decreased significantly following intermittent overground running. Voluntary activation deficits in the biceps femoris muscle are responsible for some portion of this weakness. The implications of this finding are significant because the biceps femoris muscle is the most frequently strained of all the hamstring muscles and because fatigue appears to play an important part in injury occurrence.

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ID Code: 54801
Item Type: Conference Item (Presentation)
Refereed: Yes
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > HUMAN MOVEMENT AND SPORTS SCIENCE (110600) > Human Movement and Sports Science not elsewhere classified (110699)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2012 [please consult the authors]
Deposited On: 15 Nov 2012 23:38
Last Modified: 22 Jul 2017 00:51

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