Comput. Biol. Med. - A preliminary study on the differences in male and female muscle force distribution patterns during squatting and lunging maneuvers.

Tópicos

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Resumo

In the United States, 250,000 people tear their anterior cruciate ligament (ACL) annually with females at higher risk of ACL failure than males. By predicting muscle forces during low impact maneuvers we may be able to estimate possible muscle imbalances that could lead to ACL failure during highly dynamic maneuvers. The purpose of this initial study was to predict muscle forces in males and females similar in size and activity level, during squat and lunge maneuvers. We hypothesized that during basic low impact maneuvers (a) distribution of quadriceps forces are different in males and females and (b) females exhibit quadriceps dominance when compared to males. Two males and three females performed squatting and lunging maneuvers while electromyography (EMG) data, motion capture data, and ground reaction forces were collected. Nine individual muscle forces for muscles that cross the knee were estimated using an EMG-driven model. Results suggest that males activate their rectus femoris muscle more than females, who in turn activate their vastus lateralis muscle at their maximum flexion angle, and more their vastus medialis muscle when ascending from a squat. During the lunge maneuver, males used greater biceps femoris force than females, throughout the lunge, and females exhibited higher semitendinosus force. Quadriceps dominance was evident in both males and females during the prescribed tasks, and there was no statistical difference between genders. Understanding individual muscle force distributions in males and females during low impact maneuvers may provide insights regarding failure mechanisms during highly dynamic maneuvers, when ACL injuries are more prevalent.

Resumo Limpo

unit state peopl tear anterior cruciat ligament acl annual femal higher risk acl failur male predict muscl forc low impact maneuv may abl estim possibl muscl imbal lead acl failur high dynam maneuv purpos initi studi predict muscl forc male femal similar size activ level squat lung maneuv hypothes basic low impact maneuv distribut quadricep forc differ male femal b femal exhibit quadricep domin compar male two male three femal perform squat lung maneuv electromyographi emg data motion captur data ground reaction forc collect nine individu muscl forc muscl cross knee estim use emgdriven model result suggest male activ rectus femori muscl femal turn activ vastus laterali muscl maximum flexion angl vastus mediali muscl ascend squat lung maneuv male use greater bicep femori forc femal throughout lung femal exhibit higher semitendinosus forc quadricep domin evid male femal prescrib task statist differ gender understand individu muscl forc distribut male femal low impact maneuv may provid insight regard failur mechan high dynam maneuv acl injuri preval

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