Freitas Sandro R, Mil-Homens Pedro
University of Lisbon, Faculty of Human Kinetics, CIPER, Lisbon, Portugal.
J Strength Cond Res. 2015 Jun;29(6):1737-40. doi: 10.1519/JSC.0000000000000800.
Previous studies have reported no changes on muscle architecture (MA) after static stretching interventions; however, authors have argued that stretching duration and intensity may not have been sufficient. A high-intensity stretching intervention targeting the knee flexors with an 8-week duration was conducted to observe the effects on biceps femoris long head (BF) architecture. Participants (n = 5) performed an average of 3.1 assisted-stretching sessions per week, whereas a control group (n = 5) did not perform stretching. The knee extension passive maximal range of motion (ROM), and BF fascicle length (FL), fascicle angle, and muscle thickness were assessed before and after the intervention. A significant increase was observed for FL (+12.3 mm, p = 0.04) and maximal ROM (+14.2°, p = 0.04) for the stretching group after the intervention. No significant changes were observed for the control group in any parameter. An 8-week high-intensity stretching program was observed to efficiently increase the BF FL, as well as the knee extension maximal ROM. Stretching intensity and duration may play an important role on MA adaptation.
以往研究报告称，静态拉伸干预后肌肉结构（MA）无变化；然而，作者认为拉伸持续时间和强度可能不够。进行了一项针对膝屈肌、为期8周的高强度拉伸干预，以观察对股二头肌长头（BF）结构的影响。参与者（n = 5）每周平均进行3.1次辅助拉伸训练，而对照组（n = 5）不进行拉伸。在干预前后评估膝关节伸展被动最大活动范围（ROM）以及BF肌束长度（FL）、肌束角度和肌肉厚度。干预后，拉伸组的FL显著增加（+12.3 mm，p = 0.04），最大ROM显著增加（+14.2°，p = 0.04）。对照组在任何参数上均未观察到显著变化。观察到一个为期8周的高强度拉伸计划能有效增加BF的FL以及膝关节伸展最大ROM。拉伸强度和持续时间可能在MA适应中起重要作用。
