Effect of foot type on hip muscle activation

NewsBot · Mar 18, 2015

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Effect of foot type on knee valgus, ground reaction force, and hip muscle activation in female soccer players.
Rath ME, Walker CR, Cox JG, Stearne DJ.
J Sports Med Phys Fitness. 2015 Mar 17

AIM:
The purpose of this study was to determine the degree to which subtalar joint pronation resulting from a SP foot affects knee alignment, hip muscle activation and ground reaction force attenuation in female athletes during a broad jump-to-cut maneuver.
METHODS:
Twelve National Collegiate Athletic Association (NCAA) Division II female soccer players (age=19.4 ± 1.4 years, height=1.64±0.05 m, mass=64.10±4.8 kg) were identified as having either supple planus (SP) or rigid feet (RF). Participants completed three broad jump-tocut trials onto a force plate while EMG and motion data were collected. Muscle activation levels (%MVC) in the gluteus maximus, gluteus medius, biceps femoris, and rectus femoris were calculated, and peak vertical and medial shear force, rate of loading, and valgus angle were collected for each trial.
RESULTS:
Mann-Whitney U tests revealed no statistical significance between foot-type groups, however, effect size statistics revealed practical significance for between-group %MVC biceps femoris (d=1.107), %MVC gluteus maximus (d=1.069), and vertical ground reaction force (d=1.061).
CONCLUSION:
Athletes with a SP foot type may experience decreased hip muscle activation associated with increased vertical ground reaction force during a broad jump-to-cut maneuver. This might result in reduced dynamic stability and neuromuscular control during deceleration, potentially increasing the risk of non-contact ACL injury in female soccer players.
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Admin2 · Mar 19, 2015

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