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Effects of static stretching on the hamstrings-to-quadriceps ratio and electromyographic amplitude in men

机译:静态拉伸对男性the绳肌-股四头肌比例和肌电幅度的影响

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Aim. The purpose of this study was to examine the effects of posterior thigh and leg stretching on leg flexion peak torque (PT), leg extension PT, the hamstrings-to-quadriceps (H:Q) ratio, and electromyographic (EMG) amplitude of the hamstrings and quadriceps in recreationally-active men. Methods. Fifteen men (mean age±SD=22.0±4.4 years; body mass=82.7±16.1 kg; height=173.1±6.8 cm) performed three maximal voluntary concentric isokinetic leg extension and flexion muscle actions at three randomly ordered angular velocities (60,180, and 300°·s~(-1)) before and after hamstring and calf static stretching. The stretching protocol consisted of 1 unassisted and 3 assisted static stretching exercises designed to stretch the posterior muscles of the thigh and leg. Four repetitions of each stretch were held for 30 s with 20-s rest between repetitions.rnResults. These findings indicated no significant (P>0.05) stretching-induced changes in leg flexion PT, leg extension PT, or EMG amplitude at 60,180, or 300°·s~(-1). However, the non-significant (P>0.05) 2-4% increases in leg extension PT combined with the non-significant (P>0.05) 1-2% decreases in leg flexion PT resulted in the significant (P≤0.05) 2-9% decreases in the H:Q ratio from pre- to post-stretching for all three velocities. Conclusion. These findings suggested that static stretching of the hamstrings and calf muscles may decrease the H:Q ratio. These results may be useful for athletic trainers, physical therapists, and other allied health professionals who may use the H:Q ratio as a clinical assessment.
机译:目标。这项研究的目的是检查后大腿和小腿伸展对小腿屈曲峰值扭矩(PT),小腿伸展PT,绳肌与股四头肌(H:Q)比率以及肌电图(EMG)振幅的影响。从事娱乐活动的男性的绳肌和股四头肌。方法。 15名男子(平均年龄±SD = 22.0±4.4岁;体重= 82.7±16.1公斤;身高= 173.1±6.8厘米)以三种随机有序的角速度(60,180和绳肌和小腿静态拉伸前后300°·s〜(-1))。拉伸方案包括1个无辅助的和3个辅助的静态拉伸运动,旨在拉伸大腿和小腿的后部肌肉。每次拉伸重复四次,每次30 s,两次之间休息20 s。这些发现表明,在60,180或300°·s〜(-1)时,腿部屈曲PT,腿部伸展PT或EMG幅度没有明显的拉伸诱导变化(P> 0.05)。但是,腿部伸展PT的不显着(P> 0.05)增大2-4%,而腿部屈曲PT的不显着(P> 0.05)1-2%减小导致显着(P≤0.05)2对于所有三种速度,从拉伸前到拉伸后的H:Q比率降低-9%。结论。这些发现表明,绳肌和小腿肌肉的静态拉伸可能会降低H:Q比。这些结果对于运动训练师,理疗师和其他可能使用H:Q比率作为临床评估指标的专职健康专业人员有用。

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  • 作者单位

    Biophysics Laboratory, Department of Health and Exercise Science University of Oklahoma, Norman, OK, USA;

    rnBiophysics Laboratory, Department of Health and Exercise Science University of Oklahoma, Norman, OK, USA;

    rnBiophysics Laboratory, Department of Health and Exercise Science University of Oklahoma, Norman, OK, USA;

    rnBiophysics Laboratory, Department of Health and Exercise Science University of Oklahoma, Norman, OK, USA;

    rnBiophysics Laboratory, Department of Health and Exercise Science University of Oklahoma, Norman, OK, USA;

    rnBiophysics Laboratory, Department of Health and Exercise Science University of Oklahoma, Norman, OK, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    injury risk; isokinetic; peak torque; leg extension; muscle;

    机译:受伤风险;等速运动峰值扭矩腿部伸展肌肉;
  • 入库时间 2022-08-17 23:08:23

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