Williams Michael, Harveson Lanisa, Melton Jason, Delobel Ashley, Puentedura Emilio J
Department of Physical Therapy, School of Allied Health Sciences, University of Nevada Las Vegas, 4505 Maryland Parkway, P.O. Box 453029, Las Vegas, NV 89154-3029, USA.
J Sports Med (Hindawi Publ Corp). 2013;2013:481490. doi: 10.1155/2013/481490. Epub 2013 Nov 7.
Purpose. To examine the effects of static and proprioceptive neuromuscular facilitation (PNF) stretching of the shoulder internal rotators on throwing velocity. Subjects. 27 male throwers (mean age = 25.1 years old, SD = 2.4) with adequate knowledge of demonstrable throwing mechanics. Study Design. Randomized crossover trial with repeated measures. Methods. Subjects warmed up, threw 10 pitches at their maximum velocity, were randomly assigned to 1 of 3 stretching protocols (static, PNF, or no stretch), and then repeated their 10 pitches. Velocities were recorded after each pitch and average and peak velocities were recorded after each session. Results. Data were analyzed using a 3 × 2 repeated measures ANOVA. No significant interaction between stretching and throwing velocity was observed. Main effects for time were not statistically significant. Main effects for the stretching groups were statistically significant. Discussion. Results suggest that stretching of the shoulder internal rotators did not significantly affect throwing velocity immediately after stretching. This may be due to the complexity of the throwing task. Conclusions. Stretching may be included in a thrower's warm-up without any effects on throwing velocity. Further research should be performed using a population with more throwing experience and skill.
目的。研究肩部内旋肌的静态拉伸和本体感觉神经肌肉促进法（PNF）拉伸对投掷速度的影响。受试者。27名男性投掷运动员（平均年龄 = 25.1岁，标准差 = 2.4），对可证实的投掷力学有充分了解。研究设计。采用重复测量的随机交叉试验。方法。受试者进行热身，以最大速度投掷10次投球，被随机分配到3种拉伸方案中的1种（静态拉伸、PNF拉伸或不拉伸），然后重复进行10次投球。每次投球后记录速度，每次训练后记录平均速度和峰值速度。结果。使用3×2重复测量方差分析对数据进行分析。未观察到拉伸与投掷速度之间的显著交互作用。时间的主效应无统计学意义。拉伸组的主效应有统计学意义。讨论。结果表明，肩部内旋肌的拉伸在拉伸后即刻对投掷速度没有显著影响。这可能是由于投掷任务的复杂性。结论。拉伸可纳入投掷运动员的热身活动中，而不会对投掷速度产生任何影响。应使用更具投掷经验和技能的人群进行进一步研究。
