Background Soccer-specific fatigue decreases eccentric peak torque and the functional peak hamstring to quadriceps torque ratio (fHecc:Qcon), changes thought to increase the risk of hamstring strain (HS). Inadequate eccentric muscle strength specifically at long length may also be a risk factor for HS. The effect of simulated soccer on the hamstring eccentric torque-angle profile, or the hamstring:quad torque ratio at specific joint angles has not been reported.
Objective To determine the effect of a simulated soccer on angle-specific eccentric hamstring torque and angle-specific.Hecc:Qcon (AS.Hecc:Qcon) across the range of motion.
Design Acute intervention.
Setting Semi-professional soccer.
Participants 9 male players.
Risk factor assessment Isokinetic concentric and eccentric knee flexion and concentric knee extension was evaluated in the dominant limb at 120°·s−1 pre and post the Loughborough Intermittent Shuttle Test (LIST).
Main outcome measurements Changes in eccentric hamstrings torque, concentric quadriceps torque and hamstring:quadriceps torque ratios at 9 joint angles (AS.Hecc:Qcon), angle of peak torque (APT), and fHecc:Qcon.
Results The LIST resulted in significant decreases in eccentric hamstring torque at 60˚, 50˚ and 10˚ and a significant (21.8%) decrease in AS.Hecc:Qcon at 10˚ (P<.05). Eccentric hamstring APT increased significantly (P<.05) from 7.1˚to 18.8˚.
Conclusions Simulated soccer produces angle-specific changes in hamstring eccentric torque and in AS.Hecc:Qcon and a shift in the eccentric hamstring APT. Our findings suggest that a prevention programs should both increase fatigue resistance in the hamstrings and include exercises that specifically develop long-length eccentric hamstring strength. Further research is also needed to determine if the evaluation of angle-specific.Hecc:Qcon improves the predictive power of injury risk screening over assessment of the peak torque fHecc:Qcon alone.
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