Reduced biceps femoris myoelectrical activity influences eccentric knee flexor weakness after repeat sprint running

The aim of this study was to determine whether declines in knee flexor strength following overground repeat sprints were related to changes in hamstrings myoelectrical activity. Seventeen recreationally active men completed maximal isokinetic concentric and eccentric knee flexor strength assessments...

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Bibliographic Details
Published in:Scandinavian journal of medicine & science in sports 2014-08, Vol.24 (4), p.e299-e305
Main Authors: Timmins, R. G., Opar, D. A., Williams, M. D., Schache, A. G., Dear, N. M., Shield, A. J.
Format: Article
Language:English
Subjects:
Adult
eccentric
Electromyography
Exercise Test
Fatigue
hamstring injury
Humans
isokinetic dynamometry
Male
Muscle Contraction
Muscle Weakness - physiopathology
Muscle, Skeletal - physiology
Random Allocation
repeat sprint
Running - physiology
surface electromyography
Thigh
Torque
Young Adult
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Summary:The aim of this study was to determine whether declines in knee flexor strength following overground repeat sprints were related to changes in hamstrings myoelectrical activity. Seventeen recreationally active men completed maximal isokinetic concentric and eccentric knee flexor strength assessments at 180°/s before and after repeat sprint running. Myoelectrical activity of the biceps femoris (BF) and medial hamstrings (MHs) was measured during all isokinetic contractions. Repeated measures mixed model [fixed factors = time (pre‐ and post‐repeat sprint) and leg (dominant and nondominant), random factor = participants] design was fitted with the restricted maximal likelihood method. Repeat sprint running resulted in significant declines in eccentric, and concentric, knee flexor strength (eccentric = 26 ± 4 Nm, 15% P 
ISSN:0905-7188
1600-0838
DOI:10.1111/sms.12171