Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine · 2026
Limb underloading and reduced functional use of the knee during the squat is linked to reduced jumping performance in athletes six months after anterior cruciate ligament reconstruction.
СтатьяНазвание и аннотация: Перевод пока не подготовлен
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Tsai Yi-Ju, Tsai Liang-Ching, Sprague Peter, Lyle Mark A
Аннотация
OBJECTIVES: Examine between-limb kinetic asymmetries during the ascent phase of the squat and countermovement jump (CMJ) in athletes 6 months post-anterior cruciate ligament reconstruction (ACLR). Determine whether squatting mechanics are associated with jumping mechanics and performance.
DESIGN: Cross-sectional.
SETTING: Biomechanics laboratory.
PARTICIPANTS: Twenty-two athletes (14-26 years), six months post-ACLR.
MAIN OUTCOME MEASURES: Average vertical ground reaction force (vGRF), hip and knee extensor moments, hip/knee moment ratios, and limb symmetry indices (LSIs) during the ascent phase of squatting and CMJ and jump height and reactive strength index.
RESULTS: ACLR limbs demonstrated lower knee extensor moments and vGRF, and higher hip/knee moment ratios during squat and jump ascent. LSIs for vGRF and knee extensor moment, along with the hip/knee moment ratio of the ACLR limb, were moderately-strongly correlated across squatting and jumping (r = 0.473-0.683; p < 0.05). Greater hip extensor moments and hip/knee moment ratios in both limbs were associated with poorer jump performance (r = -0.433 to -0.614; p < 0.05).
CONCLUSIONS: Squat kinetic asymmetries were associated with asymmetries in CMJ mechanics, while hip-dominant squat mechanics were associated with poorer jump performance. Physical therapy should counter hip-overreliance strategies by increasing functional use of the ACLR knee to support return to sport readiness.
DESIGN: Cross-sectional.
SETTING: Biomechanics laboratory.
PARTICIPANTS: Twenty-two athletes (14-26 years), six months post-ACLR.
MAIN OUTCOME MEASURES: Average vertical ground reaction force (vGRF), hip and knee extensor moments, hip/knee moment ratios, and limb symmetry indices (LSIs) during the ascent phase of squatting and CMJ and jump height and reactive strength index.
RESULTS: ACLR limbs demonstrated lower knee extensor moments and vGRF, and higher hip/knee moment ratios during squat and jump ascent. LSIs for vGRF and knee extensor moment, along with the hip/knee moment ratio of the ACLR limb, were moderately-strongly correlated across squatting and jumping (r = 0.473-0.683; p < 0.05). Greater hip extensor moments and hip/knee moment ratios in both limbs were associated with poorer jump performance (r = -0.433 to -0.614; p < 0.05).
CONCLUSIONS: Squat kinetic asymmetries were associated with asymmetries in CMJ mechanics, while hip-dominant squat mechanics were associated with poorer jump performance. Physical therapy should counter hip-overreliance strategies by increasing functional use of the ACLR knee to support return to sport readiness.