Zhu Yuanchun, Feng Yanan, Huang Fangchao, Li Yapeng, Wang Wenjing, Wang Xueqiang, Cao Xiangyang, Zhang Zhijie
Department of Sport Rehabilitation, Shanghai University of Sport, Shanghai, China.
Rehabilitation Therapy Center, Luoyang Orthopedic Hospital of Henan Province, Orthopedic Hospital of Henan Province, Luoyang, China.
Front Bioeng Biotechnol. 2022 Aug 15;10:958242. doi: 10.3389/fbioe.2022.958242. eCollection 2022.
Decreased muscle stiffness could reduce musculotendinous injury risk in sports and rehabilitation settings. Static stretching (SS) has been used to increase the flexibility of muscles and reduce muscle stiffness, but the effects of SS on the stiffness of specific regions of the knee extensor mechanism are unclear. The quadriceps femoris and patellar tendon are essential components of the knee extensor mechanism and play an important role in knee motion. Therefore, we explored the acute and prolonged effects of SS on the stiffness of the quadriceps femoris and patellar tendon and knee flexion range of motion (ROM). Thirty healthy male subjects participated in the study. Three 60-s SS with 30-s intervals were conducted in right knee flexion with 30° hip extension. We measured the ROM and stiffness of the vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF) and the proximal-(PPT), middle-(MPT), and distal-(DPT) region stiffness of the patellar tendon before and immediately after SS intervention, or 5 and 10 min after SS. The stiffness of the quadriceps muscle and patellar tendon were measured using MyotonPRO, and the knee flexion ROM was evaluated using a medical goniometer. Our outcomes showed that the ROM was increased after SS intervention in all-time conditions ( < 0.01). Additionally, the results showed that the stiffness of RF ( < 0.01) and PPT ( = 0.03) were decreased immediately after SS intervention. These results suggested that SS intervention could be useful to increase knee flexion ROM and temporarily reduce the stiffness of specific regions of the knee extensor mechanism.
肌肉僵硬度降低可降低运动和康复环境中肌肉肌腱损伤的风险。静态拉伸（SS）已被用于增加肌肉柔韧性并降低肌肉僵硬度，但SS对膝伸肌机制特定区域僵硬度的影响尚不清楚。股四头肌和髌腱是膝伸肌机制的重要组成部分，在膝关节运动中起重要作用。因此，我们探讨了SS对股四头肌和髌腱僵硬度以及膝关节屈曲活动度（ROM）的急性和长期影响。30名健康男性受试者参与了该研究。在右膝屈曲30°且髋关节伸展30°的情况下进行了3组每次60秒、间隔30秒的静态拉伸。我们在SS干预前、干预后即刻，以及干预后5分钟和10分钟测量了股内侧肌（VM）、股外侧肌（VL）和股直肌（RF）的ROM和僵硬度，以及髌腱的近端（PPT）、中间（MPT）和远端（DPT）区域僵硬度。使用MyotonPRO测量股四头肌和髌腱的僵硬度，使用医用角度计评估膝关节屈曲ROM。我们的结果表明，在所有时间条件下，SS干预后ROM均增加（<0.01）。此外，结果显示SS干预后即刻，RF的僵硬度（<0.01）和PPT的僵硬度（=0.03）降低。这些结果表明，SS干预可能有助于增加膝关节屈曲ROM，并暂时降低膝伸肌机制特定区域的僵硬度。
