Yamane Masahiro, Aoki Mitsuhiro, Sasaki Yuji, Kawaji Hayato
Department of Rehabilitation, Health Sciences University of Hokkaido Hospital, Sapporo, Japan.
Department of Physical Therapy, School of Rehabilitation Sciences, Health Sciences University of Hokkaido, Tobetsu, Japan.
Prog Rehabil Med. 2019 Feb 16;4:20190007. doi: 10.2490/prm.20190007. eCollection 2019.
The aim of this study was to elucidate the activities of the hip flexor muscles during straight leg raising (SLR) in healthy subjects. We also investigated the activities of these muscles during SLR with deep flexion, abduction, and external rotation.
The ten dominant right legs of ten male volunteers were analyzed in this study. Twelve SLR motion tasks were performed; these comprised combinations of hip flexion at 30°, 45°, and 60°; abduction at 0° and 20°; and external rotation at 0° and 30°. The activities of the psoas major (PM) and iliacus (IL) were measured using fine-wire electrodes, whereas the activities of the rectus femoris, sartorius, adductor longus, and tensor fasciae latae muscles were measured using surface electrodes. The percentage of the maximal voluntary isometric muscle contraction (%MVC) during SLR was calculated for each muscle and used for data analyses. The Friedman test and the Wilcoxon signed-rank test were performed for statistical analyses. The significance level was set at P <0.05.
The %MVCs for the PM and IL at 60° flexion were significantly larger than those at 30° or 45° flexion. Moreover, for a constant hip flexion, the %MVC values for the PM and IL showed no significant changes when hip abduction and external rotation were added. For the other muscles, the %MVC values showed no significant change with increasing hip flexion with or without added abduction and external rotation.
Our findings suggest that subjects who perform SLR of up to 60° mainly activate the PM and IL at larger hip flexion angles, whereas the other muscles included in the analysis do not contribute greatly to increased flexion angles during SLR.
本研究旨在阐明健康受试者直腿抬高（SLR）过程中髋屈肌的活动情况。我们还研究了在深度屈曲、外展和外旋的SLR过程中这些肌肉的活动。
本研究分析了10名男性志愿者的10条优势右腿。进行了12项SLR运动任务；这些任务包括30°、45°和60°的髋部屈曲；0°和20°的外展；以及0°和30°的外旋的组合。使用细丝电极测量腰大肌（PM）和髂肌（IL）的活动，而使用表面电极测量股直肌、缝匠肌、长收肌和阔筋膜张肌的活动。计算每条肌肉在SLR过程中最大自主等长肌肉收缩百分比（%MVC），并用于数据分析。进行Friedman检验和Wilcoxon符号秩检验进行统计分析。显著性水平设定为P<0.05。
60°屈曲时PM和IL的%MVC显著大于30°或45°屈曲时。此外，对于恒定的髋部屈曲，当增加髋部外展和外旋时，PM和IL的%MVC值没有显著变化。对于其他肌肉，无论是否增加外展和外旋，随着髋部屈曲增加，%MVC值没有显著变化。
我们的研究结果表明，进行高达60°SLR的受试者在较大的髋部屈曲角度时主要激活PM和IL，而分析中包括的其他肌肉在SLR过程中对增加屈曲角度的贡献不大。
