Goodwin Jon E, Bull Anthony M J
Faculty of Sport, Health and Applied Science, St Mary's University, Twickenham, London; and.
Imperial College, London, United Kingdom.
J Strength Cond Res. 2022 Oct 1;36(10):2762-2770. doi: 10.1519/JSC.0000000000004012. Epub 2021 Mar 31.
Goodwin, JE and Bull, AMJ. Novel assessment of isometric hip extensor function: reliability, joint angle sensitivity, and concurrent validity. J Strength Cond Res 36(10): 2762-2770, 2022-Closed-chain hip extension function has not been well examined. The aim of this study was to examine the reliability, joint angle sensitivity, muscle recruitment, and concurrent validity of a force plate-based isometric hip extensor test (isometric hip thrust). All subjects were active men aged 19-29 years. In part 1, bilateral and unilateral hip extensor testing was completed on 4 occasions by 14 subjects to evaluate repeatability of force and torque measures. In part 2, joint angle sensitivity of force, torque, and surface electromyography was assessed by 10 subjects completing testing at 4 hip joint angles in a single test session. In part 3, concurrent validity of joint torque was assessed relative to standing and supine test positions on an isokinetic dynamometer, by 10 subjects in a single test session. The repeatability study found small changes in the mean from sessions 1-2 (mean standardized change d = 0.31) and close to no change in later sessions (mean d = 0.12). Typical error was predominantly low to moderate (mean 0.42), and intraclass correlation coefficient (ICC) was typically high (mean ICC = 0.87). The joint angle sensitivity study showed that increasing the hip flexion resulted in increases in peak extension force ( p = 0.001) and gluteus maximus activation ( p = 0.003) and a reduction in biceps femoris activation ( p < 0.001). There was no change in torque ( p = 0.585) and vastus lateralis activation ( p = 0.482). The concurrent validity study found that torque was correlated with supine dynamometry ( R2 = 0.555) but not with standing dynamometry ( R2 = 0.193). In summary, the isometric hip thrust is repeatable, but benefits from familiarization. Force output and muscle recruitment are sensitive to joint position, providing an opportunity to assess different functional output.
古德温，JE和布尔，AMJ。等长髋关节伸肌功能的新型评估：可靠性、关节角度敏感性和同时效度。《力量与体能研究杂志》36(10): 2762 - 2770，2022年 - 闭链髋关节伸展功能尚未得到充分研究。本研究的目的是检验基于测力台的等长髋关节伸肌测试（等长臀桥）的可靠性、关节角度敏感性、肌肉募集情况和同时效度。所有受试者均为19 - 29岁的活跃男性。在第1部分，14名受试者进行了4次双侧和单侧髋关节伸肌测试，以评估力量和扭矩测量的重复性。在第2部分，10名受试者在单次测试中于4个髋关节角度完成测试，评估力量、扭矩和表面肌电图的关节角度敏感性。在第3部分，10名受试者在单次测试中相对于等速测力计上的站立和仰卧测试位置评估关节扭矩的同时效度。重复性研究发现，第1 - 2次测试的平均值变化较小（平均标准化变化d = 0.31），后续测试中变化接近零（平均d = 0.12）。典型误差主要为低到中等（平均0.42），组内相关系数（ICC）通常较高（平均ICC = 0.87）。关节角度敏感性研究表明，增加髋关节屈曲会导致伸展峰值力量增加（p = 0.001）和臀大肌激活增加（p = 0.003），股二头肌激活减少（p < 0.001）。扭矩（p = 0.585）和股外侧肌激活（p = 0.482）没有变化。同时效度研究发现，扭矩与仰卧测力相关（R2 = 0.555），但与站立测力无关（R2 = 0.193）。总之，等长臀桥测试具有可重复性，但熟悉过程会有帮助。力量输出和肌肉募集对关节位置敏感，这为评估不同功能输出提供了机会。
