Philpott Emily J, Bahrami Mohammadmahdi, Sardroodian Mahta, Behm David G
School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, NL A1C 5S7, Canada.
Sports (Basel). 2024 Sep 18;12(9):257. doi: 10.3390/sports12090257.
Increases in contralateral range of motion (ROM) have been shown following acute high-intensity and high-duration static stretching (SS) with no significant change in contralateral force, power, and muscle activation. There are currently no studies comparing the effects of a high-intensity, short-duration (HISD) or low-intensity, long-duration (LILD) SS on contralateral performance.
The aim of this study was to examine how HISD and LILD SS of the dominant leg hamstrings influence contralateral limb performance.
Sixteen trained participants (eight females, eight males) completed three SS interventions of the dominant leg hamstrings; (1) HISD (6 × 10 s at maximal point of discomfort), (2) LILD (6 × 30 s at initial point of discomfort), and (3) control. Dominant and non-dominant ROM, maximal voluntary isometric contraction (MVIC) forces, muscle activation (electromyography (EMG)), and unilateral CMJ and DJ heights were recorded pre-test and 1 min post-test.
There were no significant contralateral ROM or performance changes. Following the HISD condition, the post-test ROM for the stretched leg (110.6 ± 12.6°) exceeded the pre-test (106.0 ± 9.0°) by a small magnitude effect of 4.2% ( = 0.008, d = 0.42). With LILD, the stretched leg post-test (112.2 ± 16.5°) exceeded (2.6%, = 0.06, d = 0.18) the pre-test ROM (109.3 ± 16.2°) by a non-significant, trivial magnitude. There were large magnitude impairments, evidenced by main effects for testing time for force, instantaneous strength, and associated EMG. A significant ROM interaction ( = 0.02) showed that with LILD, the stretched leg significantly ( = 0.05) exceeded the contralateral leg by 13.4% post-test.
The results showing no significant increase in contralateral ROM with either HISD or LILD SS, suggesting the interventions may not have been effective in promoting crossover effects.
急性高强度、长时间静态拉伸（SS）后，对侧运动范围（ROM）有所增加，而对侧力量、功率和肌肉激活无显著变化。目前尚无研究比较高强度、短时间（HISD）或低强度、长时间（LILD）SS对侧肢体表现的影响。
本研究旨在探讨优势腿腘绳肌的HISD和LILD SS如何影响对侧肢体表现。
16名训练有素的参与者（8名女性，8名男性）完成了优势腿腘绳肌的三种SS干预；（1）HISD（在最大不适点进行6×10秒），（2）LILD（在初始不适点进行6×30秒），以及（3）对照。在测试前和测试后1分钟记录优势侧和非优势侧的ROM、最大自主等长收缩（MVIC）力量、肌肉激活（肌电图（EMG））以及单侧纵跳和深蹲跳高度。
对侧ROM或表现无显著变化。在HISD条件下，拉伸腿的测试后ROM（110.6±12.6°）比测试前（106.0±9.0°）小幅增加了4.2%（P = 0.008，d = 0.42）。对于LILD，拉伸腿的测试后ROM（112.2±16.5°）比测试前ROM（109.3±16.2°）增加了2.6%（P = 0.06，d = 0.18），幅度不显著且微小。力量、瞬时力量和相关EMG的测试时间主效应表明存在大幅损伤。显著的ROM交互作用（P = 0.02）表明，对于LILD，拉伸腿在测试后比非拉伸腿显著增加了13.4%（P = 0.05）。
结果表明，HISD或LILD SS均未使对侧ROM显著增加，这表明这些干预措施可能在促进交叉效应方面无效。
