Aslan Hussain, Buddhadev Harsh H, Suprak David N, San Juan Jun G
Western Washington University, Bellingham, WA, USA.
Better Health Thru Exercise, Kirkland, WA, USA.
Int J Sports Phys Ther. 2018 Aug;13(5):846-859.
Tightness of hip flexor muscles has been recognized as a risk factor for various musculoskeletal injuries in the lower extremities.
The purpose of this study was to examine the acute effects of two hip flexor stretching techniques (dynamic and hold-relax proprioceptive neuromuscular facilitation, HR-PNF) on hip extension (ROM), knee joint position sense (JPS) and balance in healthy college age students who exhibit tightness in hip flexor muscles.
Pretest-posttest randomized experimental groups.
Thirty-six healthy college age students (mean = 22.37 years) with tight hip flexors participated in this study. Hip extension ROM, knee joint position sense and dynamic balance were tested pre- and post-stretching using a digital inclinometer, an iPod touch and the Y-Balance test, respectively. Subjects were randomly divided into dynamic and HR-PNF stretching groups. Three-way mixed analysis of variance was utilized to explore if an interaction existed between the groups in tested variables.
There was a significant effect of time on hip extension ROM in both groups ( < 0.001). There was also a significant effect of stretch type on hip extension ROM ( = 0.004) favoring hold-relax over dynamic stretching group. There was a non-significant effect of time on mean knee joint position replication error in both groups. There was a significant main effect of time on the Y-Balance test's mean distance of reach to posteromedial and posterolateral directions ( < 0.001). There was also a significant main effect of directions of reach on distances achieved ( < 0.001) favoring posterolateral over posteromedial, and the latter over anterior direction.
The results of this study demonstrated the effectiveness of both HR-PNF and dynamic stretching techniques which resulted in a significant acute improvement in hip extension ROM and dynamic balance measures, with HR-PNF being more effective than dynamic stretch. However, there were no significant improvements in knee joint position replication over time in either stretching group.
2b.
髋屈肌紧张已被认为是下肢各种肌肉骨骼损伤的一个危险因素。
本研究的目的是检验两种髋屈肌拉伸技术（动态拉伸和保持 - 放松本体感觉神经肌肉促进法，HR - PNF）对髋伸展度（ROM）、膝关节位置觉（JPS）以及髋屈肌紧张的健康大学生平衡能力的急性影响。
前测 - 后测随机实验组。
36名髋屈肌紧张的健康大学生（平均年龄 = 22.37岁）参与了本研究。分别使用数字倾角仪、iPod touch和Y平衡测试，在拉伸前后测试髋伸展度ROM、膝关节位置觉和动态平衡。受试者被随机分为动态拉伸组和HR - PNF拉伸组。采用三因素混合方差分析来探讨测试变量在两组之间是否存在交互作用。
两组中时间对髋伸展度ROM均有显著影响（< 0.001）。拉伸类型对髋伸展度ROM也有显著影响（ = 0.004），保持 - 放松组优于动态拉伸组。两组中时间对平均膝关节位置复制误差均无显著影响。时间对Y平衡测试中向后内侧和向后外侧方向的平均伸展距离有显著主效应（< 0.001）。伸展方向对达到的距离也有显著主效应（< 0.001），向后外侧优于向后内侧，且向后内侧优于前方。
本研究结果表明，HR - PNF和动态拉伸技术均有效，能使髋伸展度ROM和动态平衡指标有显著急性改善，HR - PNF比动态拉伸更有效。然而，在任何一个拉伸组中，膝关节位置复制随时间均无显著改善。
2b。
