Wilson Samantha J, Christensen Bryan, Gange Kara, Todden Christopher, Hatterman-Valenti Harlene, Albrecht Jay M
J Sport Rehabil. 2019 Jan 1;28(1):67-71. doi: 10.1123/jsr.2017-0101.
Chronic plantarflexor (PF) stretching during ankle immobilization helps preserve calf girth, plantarflexion peak torque, and ankle dorsiflexion (DF) motion. Immobilization can lead to decreases in muscle peak torque, muscle size, and joint range of motion (ROM). Recurrent static stretching during a period of immobilization may reduce the extent of these losses.
To investigate the effects of chronic static stretching on PF peak torque, calf girth, and DF ROM after 2 weeks of ankle immobilization.
Randomized controlled clinical trial.
Athletic training facility.
A total of 36 healthy college-aged (19.81 [2.48]) females.
Subjects were randomly assigned to one of 3 groups: control group, immobilized group (IM), and immobilized plus stretching (IM+S) group. Each group participated in a familiarization period, a pretest, and, 2 weeks later, a posttest. The IM group and IM+S group wore the Aircast Foam Pneumatic Walker for 2 weeks on the left leg. During this time, the IM+S group participated in a stretching program, which consisted of two 10-minute stretching procedures each day for the 14 days.
One-way analysis of variance was used to determine differences in the change of ankle girth, PF peak torque, and DF ROM between groups with an α level of <.05.
A significant difference was noted between groups in girth (F2,31 = 5.64, P = .01), DF ROM (F2,31 = 26.13, P < .001), and PF peak torque (F2,31 = 7.74, P = .002). Post hoc testing also showed a significance difference between change in calf girth of the control group compared with the IM group (P = .01) and a significant difference in change of peak torque in the IM+S group and the IM group (P = .001). Also, a significant difference was shown in DF ROM between the control group and IM+S group (P = .01), the control group and the IM group (P < .001), and the IM+S group and the IM group (P < .001).
Chronic static stretching during 2 weeks of immobilization may decrease the loss of calf girth, ankle PF peak torque, and ankle DF ROM.
踝关节固定期间进行慢性跖屈（PF）拉伸有助于保持小腿围度、跖屈峰值扭矩和踝关节背屈（DF）活动度。固定会导致肌肉峰值扭矩、肌肉大小和关节活动范围（ROM）下降。在固定期间反复进行静态拉伸可能会减少这些损失的程度。
探讨踝关节固定2周后慢性静态拉伸对PF峰值扭矩、小腿围度和DF活动度的影响。
随机对照临床试验。
运动训练设施。
共36名健康的大学年龄（19.81[2.48]）女性。
受试者被随机分为3组之一：对照组、固定组（IM）和固定加拉伸（IM+S）组。每组都参与了一个熟悉期、一次预测试，以及2周后的一次后测试。IM组和IM+S组左腿佩戴Aircast泡沫充气式步行器2周。在此期间，IM+S组参与了一个拉伸计划，该计划包括在14天内每天进行两次10分钟的拉伸程序。
采用单因素方差分析来确定组间踝关节围度、PF峰值扭矩和DF活动度变化的差异，α水平<.05。
组间在围度（F2,31 = 5.64，P =.01）、DF活动度（F2,31 = 26.13，P <.001）和PF峰值扭矩（F2,31 = 7.74，P =.002）方面存在显著差异。事后检验还显示，对照组与IM组小腿围度变化之间存在显著差异（P =.01），IM+S组与IM组峰值扭矩变化之间存在显著差异（P =.001）。此外，对照组与IM+S组之间（P =.01）、对照组与IM组之间（P <.001）以及IM+S组与IM组之间（P <.001）的DF活动度也存在显著差异。
固定2周期间进行慢性静态拉伸可能会减少小腿围度、踝关节PF峰值扭矩和踝关节DF活动度的损失。
