Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.
J Orthop Res. 2011 Nov;29(11):1759-63. doi: 10.1002/jor.21445. Epub 2011 Apr 21.
Static stretching (SS) is commonly used to prevent or improve limited joint mobility. However, it is unclear whether the components of the muscle-tendon unit (MTU) are affected by 5 min of SS. This study investigated the acute and prolonged effect of SS on the mechanical properties of the MTU. The subjects comprised 15 male participants (mean age: 21.5 ± 1.6 years). MTU stiffness, muscle stiffness, tendon stiffness, and fascicle length of the gastrocnemius muscle were measured by ultrasonography and a dynamometer while the ankle was passively dorsiflexed. The measurements were performed prior to the 5 min of SS, immediately after the SS, and 10 min after the SS. MTU stiffness and muscle stiffness significantly decreased at both immediately and 10 min after SS, whereas no significant differences in MTU stiffness and muscle stiffness were found between immediately and 10 min after SS. Tendon stiffness immediately after SS was significantly higher than prior to and 10 min after SS. No significant change in the fascicle length occurred after SS. These results suggest that 5 min of SS affects MTU and muscle stiffness both immediately and 10 min after SS, which may be associated with a change in the connective tissue properties.
静态伸展（SS）常用于预防或改善关节活动度受限。然而，目前尚不清楚肌肉-肌腱单元（MTU）的各个组成部分是否会受到 5 分钟 SS 的影响。本研究旨在探讨 SS 对 MTU 力学性能的急性和长期影响。15 名男性参与者（平均年龄：21.5±1.6 岁）参加了本研究。通过超声和测力计测量了跟腱被动背屈时的 MTU 硬度、肌肉硬度、肌腱硬度和腓肠肌肌束长度。测量在 5 分钟 SS 之前、SS 后即刻和 SS 后 10 分钟进行。SS 后即刻和 10 分钟时，MTU 硬度和肌肉硬度均显著降低，而 SS 后即刻和 10 分钟时 MTU 硬度和肌肉硬度无显著差异。SS 后即刻时的肌腱硬度明显高于 SS 前和 SS 后 10 分钟时的肌腱硬度。SS 后肌束长度无明显变化。这些结果表明，5 分钟 SS 会影响 MTU 和肌肉硬度，且影响会在 SS 后即刻和 10 分钟持续存在，这可能与结缔组织特性的变化有关。
