The Effects of Gluteal Strength and Activation on the Relationship Between Femoral Alignment and Functional Valgus Collapse During a Single-Leg Landing

美第斯 外翻 臀肌 医学 口腔正畸科 等长运动 肌电图 地面反作用力 负重 解剖 物理疗法 物理医学与康复 外科 运动学 物理 经典力学
作者
Jennifer A. Hogg,Terry A. Ackerman,Anh‐Dung Nguyen,Scott E. Ross,Randy J. Schmitz,Jos Vanrenterghem,Sandra J. Shultz
出处
期刊:Journal of Sport Rehabilitation [Human Kinetics]
卷期号:30 (6): 942-951 被引量:8
标识
DOI:10.1123/jsr.2019-0528
摘要

A bias toward femoral internal rotation is a potential precursor to functional valgus collapse. The gluteal muscles may play a critical role in mitigating these effects.Determine the extent to which gluteal strength and activation mediate associations between femoral alignment measures and functional valgus collapse.Cross-sectional.Research laboratory.Forty-five females (age = 20.1 [1.7] y; height = 165.2 [7.6] cm; weight = 68.6 [13.1] kg) and 45 males (age = 20.8 [2.0] y; height = 177.5 [8.7] cm; weight = 82.7 [16.5] kg), healthy for 6 months prior.Femoral alignment was measured prone. Hip-extension and abduction strength were obtained using a handheld dynamometer. Three-dimensional biomechanics and surface electromyography were obtained during single-leg forward landings.Forward stepwise multiple linear regressions determined the influence of femoral alignment on functional valgus collapse and the mediating effects of gluteus maximus and medius strength and activation.In females, less hip abduction strength predicted greater peak hip adduction angle (R2 change = .10; P = .02), and greater hip-extensor activation predicted greater peak knee internal rotation angle (R2 change = .14; P = .01). In males, lesser hip abduction strength predicted smaller peak knee abduction moment (R2 change = .11; P = .03), and the combination of lesser hip abduction peak torque and lesser gluteus medius activation predicted greater hip internal rotation angle (R2 change = .15; P = .04). No meaningful mediation effects were observed (υadj < .01).In females, after accounting for femoral alignment, less gluteal strength and higher muscle activation were marginally associated with valgus movement. In males, less gluteal strength was associated with a more varus posture. Gluteal strength did not mediate femoral alignment. Future research should determine the capability of females to use their strength efficiently.
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