Aquino Cecília F, Fonseca Sérgio T, Gonçalves Gabriela G P, Silva Paula L P, Ocarino Juliana M, Mancini Marisa C
Fundação Educacional de Divinópolis, FUNEDI, Av. Sete de Setembro, 949. Centro, Divinópolis, Minas Gerais 35500-011, Brazil.
Man Ther. 2010 Feb;15(1):26-31. doi: 10.1016/j.math.2009.05.006. Epub 2009 Jul 25.
Stretching is used to modify muscle length. However, its effects seem to be temporary. There is evidence in animal models that strengthening in a lengthened position may induce long lasting changes in muscle length. The objective of this study was to compare changes in hamstrings flexibility, peak torque angle and stretch tolerance after two training programs: stretching and strengthening in a lengthened position. Forty-five subjects with tight hamstrings were randomly assigned into three groups: control, stretching and strength training in lengthened position. The interventions were performed three times a week for eight weeks. The subjects were assessed before and after the end of the programs. Data provided by an isokinetic dynamometer were used to assess hamstrings flexibility, peak torque angle, and stretch tolerance. The data analysis demonstrated that strengthening in lengthened position changed peak torque angle in the direction of knee extension (p=0.001). No change in flexibility was observed (p=0.449). Both experimental groups showed an increase in stretch tolerance (p=0.001). The results demonstrated that strengthening in a lengthened position produced a shift of the torque-angle curve, which suggests an increase in muscle length. Conversely, stretching did not produce modification of torque-angle curve and flexibility; its effects appear restricted to increases in stretch tolerance.
拉伸用于改变肌肉长度。然而，其效果似乎是暂时的。在动物模型中有证据表明，在拉长位置进行强化训练可能会引起肌肉长度的持久变化。本研究的目的是比较两种训练方案（拉伸和在拉长位置进行强化训练）后腘绳肌柔韧性、峰值扭矩角度和拉伸耐受性的变化。45名腘绳肌紧张的受试者被随机分为三组：对照组、拉伸组和在拉长位置进行力量训练组。干预措施每周进行三次，共八周。在训练方案结束前后对受试者进行评估。使用等速测力计提供的数据来评估腘绳肌柔韧性、峰值扭矩角度和拉伸耐受性。数据分析表明，在拉长位置进行强化训练使峰值扭矩角度向膝关节伸展方向改变（p = 0.001）。未观察到柔韧性变化（p = 0.449）。两个实验组的拉伸耐受性均有所增加（p = 0.001）。结果表明，在拉长位置进行强化训练会使扭矩-角度曲线发生偏移，这表明肌肉长度增加。相反，拉伸并未使扭矩-角度曲线和柔韧性发生改变；其效果似乎仅限于拉伸耐受性的增加。
