J Sport Rehabil. 2020 Nov 25;30(4):573-581. doi: 10.1123/jsr.2020-0268.
Hip muscle strength has previously been evaluated in various sagittal plane testing positions. Altering the testing position appears to have an influence on hip muscle torque during hip extension, abduction, and external rotation. However, it is unknown how altering the testing position influences hip muscle activity during these commonly performed assessments.
To evaluate how hip sagittal plane position influences hip muscle activation and torque output.
Cross-sectional.
Laboratory.
A total of 22 healthy females (age = 22.1 [1.4] y; mass = 63.4 [11.3] kg; height = 168.4 [6.2] cm) were recruited.
None.
Participants completed isometric contractions with surface electromyography on the superior and inferior gluteus maximus; anterior, middle, and posterior gluteus medius; biceps femoris, semitendinosus, adductor longus, and tensor fascia latae. Extension and external rotation were tested in 0°, 45°, and 90° of hip flexion and abduction was tested in -5°, 0°, and 45° of hip flexion. Repeated-measures analysis of variances were used for statistical analysis (P ≤ .01).
Activation of gluteal (P < .007), semitendinosus (P = .002), and adductor longus (P = .001) muscles were lesser for extension at 90° versus less flexed positions. Adductor longus activity was greatest during 90° of hip flexion for external rotation torque testing (P < .001). Tensor fascia latae (P < .001) and gluteus maximus (P < .001) activities were greater in 45° of hip flexion. Significant differences in extension (P < .001) and abduction (P < .001) torque were found among positions.
Position when assessing hip extension and abduction torque has an influence on both muscle activity and torque output but only muscle activity for hip external rotation torque. Clinicians should be aware of the influence of position on hip extension, abduction, and external rotation muscle testing and select a position most in line with their clinical goals.
髋关节肌肉力量已在各种矢状面测试位置进行了评估。改变测试位置似乎会对髋关节伸展、外展和外旋时的髋关节肌肉扭矩产生影响。然而，目前尚不清楚改变测试位置如何影响这些常见评估中的髋关节肌肉活动。
评估髋关节矢状面位置如何影响髋关节肌肉激活和扭矩输出。
横断面研究。
实验室。
共招募了 22 名健康女性（年龄=22.1[1.4]岁；体重=63.4[11.3]kg；身高=168.4[6.2]cm）。
无。
参与者在 0°、45°和 90°髋关节屈曲位进行等长收缩，同时进行表面肌电图检测上、下臀大肌；前、中、后臀中肌；股二头肌、半腱肌、长收肌和阔筋膜张肌。在-5°、0°和 45°髋关节屈曲位测试外展，在 0°、45°和 90°髋关节屈曲位测试伸展。使用重复测量方差分析进行统计学分析（P≤.01）。
与较不弯曲的位置相比，伸展时在 90°时臀肌（P<.007）、半腱肌（P=.002）和长收肌（P=.001）的激活较小。在外展扭矩测试中，当髋关节处于 90°屈曲位时，长收肌的活动最大（P<.001）。阔筋膜张肌（P<.001）和臀大肌（P<.001）的活动在髋关节屈曲 45°时更大。在伸展（P<.001）和外展（P<.001）扭矩位置之间发现了显著差异。
评估髋关节伸展和外展扭矩的位置会对肌肉活动和扭矩输出产生影响，但仅对外展旋转扭矩的肌肉活动有影响。临床医生应意识到位置对髋关节伸展、外展和外旋肌肉测试的影响，并选择最符合其临床目标的位置。
