Rees Sven S, Murphy Aron J, Watsford Mark L, McLachlan Ken A, Coutts Aaron J
Biomechanics Laboratory, School of Leisure, Sport and Tourisn, University of Technology, Sydney, Australia.
J Strength Cond Res. 2007 May;21(2):572-7. doi: 10.1519/R-20175.1.
The purpose of this study was to examine the effect of proprioceptive neuromuscular facilitation (PNF) stretching on musculotendinous unit (MTU) stiffness of the ankle joint. Twenty active women were assessed for maximal ankle range of motion, maximal strength of planter flexors, rate of force development, and ankle MTU stiffness. Subjects were randomly allocated into an experimental (n = 10) group or control group (n = 10). The experimental group performed PNF stretching on the ankle joint 3 times per week for 4 weeks, with physiological testing performed before and after the training period. After training, the experimental group significantly increased ankle range of motion (7.8%), maximal isometric strength (26%), rate of force development (25%), and MTU stiffness (8.4%) (p < 0.001). Four weeks of PNF stretching contributed to an increase in MTU stiffness, which occurred concurrently with gains to ankle joint range of motion. The results confirm that MTU stiffness and joint range of motion measurements appear to be separate entities. The increased MTU stiffness after the training period is explained by adaptations to maximal isometric muscle contractions, which were a component of PNF stretching. Because a stiffer MTU system is linked with an improved the ability to store and release elastic energy, PNF stretching would benefit certain athletic performance due to a reduced contraction time or greater mechanical efficiency. The results of this study suggest PNF stretching is a useful modality at increasing a joint's range of motion and its strength.
本研究的目的是探讨本体感觉神经肌肉促进法（PNF）拉伸对踝关节肌肉肌腱单元（MTU）僵硬度的影响。对20名活跃女性进行了踝关节最大活动范围、跖屈肌最大力量、力量发展速率和踝关节MTU僵硬度的评估。受试者被随机分为实验组（n = 10）或对照组（n = 10）。实验组每周对踝关节进行3次PNF拉伸，共4周，并在训练前后进行生理测试。训练后，实验组的踝关节活动范围显著增加（7.8%）、最大等长力量增加（26%）、力量发展速率增加（25%）以及MTU僵硬度增加（8.4%）（p < 0.001）。四周的PNF拉伸有助于MTU僵硬度增加，这与踝关节活动范围的增加同时出现。结果证实，MTU僵硬度和关节活动范围测量似乎是独立的指标。训练期后MTU僵硬度增加是由于对最大等长肌肉收缩的适应性变化，这是PNF拉伸的一个组成部分。由于更僵硬的MTU系统与储存和释放弹性能量的能力提高有关，PNF拉伸可能会因缩短收缩时间或提高机械效率而有益于某些运动表现。本研究结果表明，PNF拉伸是增加关节活动范围和力量的一种有效方式。
