Miyamoto Naokazu, Hirata Kosuke, Kimura Noriko, Miyamoto-Mikami Eri
National Institute of Fitness and Sports in Kanoya, Department of Sports and Life Science, Kanoya, Japan.
Int J Sports Med. 2018 Feb;39(2):110-114. doi: 10.1055/s-0043-117411. Epub 2017 Nov 30.
The passive straight-leg-raise (PSLR) and the sit-and-reach (SR) tests have been widely used to assess hamstring extensibility. However, it remains unclear to what extent hamstring stiffness (a measure of material properties) contributes to PSLR and SR test scores. Therefore, we aimed to clarify the relationship between hamstring stiffness and PSLR and SR scores using ultrasound shear wave elastography. Ninety-eight healthy subjects completed the study. Each subject completed PSLR testing, and classic and modified SR testing of the right leg. Muscle shear modulus of the biceps femoris, semitendinosus, and semimembranosus was quantified as an index of muscle stiffness. The relationships between shear modulus of each muscle and PSLR or SR scores were calculated using Pearson's product-moment correlation coefficients. Shear modulus of the semitendinosus and semimembranosus showed negative correlations with the two PSLR and two SR scores (absolute r value≤0.484). Shear modulus of the biceps femoris was significantly correlated with the PSLR score determined by the examiner and the modified SR score (absolute r value≤0.308). The present findings suggest that PSLR and SR test scores are strongly influenced by factors other than hamstring stiffness and therefore might not accurately evaluate hamstring stiffness.
被动直腿抬高（PSLR）试验和坐位体前屈（SR）试验已被广泛用于评估腘绳肌的伸展性。然而，目前尚不清楚腘绳肌僵硬度（一种材料属性的度量）在多大程度上影响PSLR和SR试验得分。因此，我们旨在使用超声剪切波弹性成像技术来阐明腘绳肌僵硬度与PSLR和SR得分之间的关系。98名健康受试者完成了本研究。每位受试者均完成了PSLR测试以及右腿的经典和改良SR测试。将股二头肌、半腱肌和半膜肌的肌肉剪切模量作为肌肉僵硬度的指标进行量化。使用Pearson积差相关系数计算每块肌肉的剪切模量与PSLR或SR得分之间的关系。半腱肌和半膜肌的剪切模量与两个PSLR和两个SR得分均呈负相关（绝对r值≤0.484）。股二头肌的剪切模量与检查者确定的PSLR得分和改良SR得分显著相关（绝对r值≤0.308）。本研究结果表明，PSLR和SR试验得分受腘绳肌僵硬度以外的因素强烈影响，因此可能无法准确评估腘绳肌僵硬度。
