Nara Ginji, Samukawa Mina, Oba Kensuke, Koshino Yuta, Ishida Tomoya, Kasahara Satoshi, Tohyama Harukazu
Rehabilitation Center, NTT Medical Center Sapporo, Sapporo, Japan; Graduate School of Health Sciences, Hokkaido University, Sapporo, Japan.
Faculty of Health Sciences, Hokkaido University, Sapporo, Japan.
Phys Ther Sport. 2022 Jan;53:91-96. doi: 10.1016/j.ptsp.2021.11.011. Epub 2021 Nov 30.
To investigate the effects of knee flexion angle on peak torque, rate of torque development (RTD) during isometric contraction and hamstring flexibility after hamstring strain injury (HSI).
Cross-sectional.
Controlled laboratory research.
Fourteen male athletes with a history of HSI and 14 athletes without HSI (controls).
Hamstring flexibility was evaluated using active knee extension test. Isometric knee flexion peak torque and RTD were determined at 30°, 60°, and 90° of knee flexion measured by an isokinetic dynamometer.
Individuals with a history of HSI had statistically significant, moderate deficits in isometric peak torque at 30° of knee flexion (P = 0.037; effect size = 0.55) in the HSI limb than in the uninjured limb, but not at 60° and 90° of knee flexion. In the control group, no significant differences in isometric peak torque at any angle were found between limbs. No differences in peak RTD and flexibility were found between limbs in both groups.
Isometric peak torque at 30° of knee flexion was lower in the injured limb than in the uninjured limb. Isometric strength deficits after HSI tended to be affected by lengthened hamstring angles.
探讨屈膝角度对腘绳肌拉伤（HSI）后等长收缩时的峰值扭矩、扭矩发展速率（RTD）以及腘绳肌柔韧性的影响。
横断面研究。
对照实验室研究。
14名有HSI病史的男性运动员和14名无HSI病史的运动员（对照组）。
采用主动伸膝试验评估腘绳肌柔韧性。通过等速测力计测定在屈膝30°、60°和90°时的等长屈膝峰值扭矩和RTD。
有HSI病史的个体，患侧肢体在屈膝30°时的等长峰值扭矩较健侧肢体有统计学意义的中度不足（P = 0.037；效应量 = 0.55），但在屈膝60°和90°时无此现象。在对照组中，各角度下两侧肢体的等长峰值扭矩均无显著差异。两组中两侧肢体的峰值RTD和柔韧性均无差异。
患侧肢体在屈膝30°时的等长峰值扭矩低于健侧肢体。HSI后的等长力量不足往往受腘绳肌角度延长的影响。
