Does Prior Hamstring Strain Injury Affect Hamstring Muscle Activation Patterns in Amateur Football Players? A Feasibility Study

Ahmed Ahmed


Hamstring stains are very common injuries among athletes. Re-injury rate for hamstring strains is high and factors effecting hamstring re-injury is a research topic of interest. The aim of this study was to determine if there is a relationship between prior hamstring strain injury and medial:lateral (M:L) hamstring activation ratio in amateur football players during normal gait. Six male amateur football players with a history of unilateral hamstring strain injury volunteered for participation in this study. EMG data from the semitendinosus and biceps femoris muscles was recorded across a full gait cycle. The results of this preliminary, feasibility study show no significant difference between mean M:L hamstring activation ratios in previously injured hamstrings (Mean (M)=2.54, Standard Deviation (SD)=1.56) and uninjured contralateral hamstrings (M=3.06, SD=2.86) across the full gait cycle; t(10) = 0.73, p>0.05. Mean M:L activation ratios during ‘Stance phase’ show no significant difference between case and control hamstrings; t(10)=0.88, p>0.05. During ‘Swing phase’ there is no significant difference in mean M:L activation ratios between previously injured and uninjured hamstrings; t(10)=0.61, p>0.05.


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