Yoshikawa Kohei, Kida Noriyuki, Jiroumaru Takumi, Murata Yuta, Noguchi Shinichi
Kanazawa Orthopaedic and Sports Medicine Clinic, 881 Ono, Ritto 520-3016, Japan.
Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan.
J Funct Morphol Kinesiol. 2024 Dec 18;9(4):276. doi: 10.3390/jfmk9040276.
BACKGROUND/OBJECTIVES: The active straight leg raise requires intricate coordination between the hip, knee, pelvis, and spine. Despite its complexity, limited research has explored the relationship between lower limb raising velocity and trunk muscle motor control during an active straight leg raise in healthy individuals. This study aimed to explore the potential effects of increased lower limb raising velocity on core muscle contractions during active straight leg raises.
Six healthy adult men (mean age: 24.5 ± 2.5 years) participated in this study. Electromyography signals were recorded using surface electrodes placed on the rectus abdominis, external oblique, and internal oblique/transverse abdominis muscles. The participants performed active straight leg raises at three different velocities: 3 s, 2 s, and as fast as possible (max). The electromyography data were analyzed from 250 ms before to 1000 ms after movement initiation, with muscle activity expressed as a percentage of the maximal voluntary isometric contraction. Statistical analyses were conducted using non-parametric tests, including the Friedman test for overall differences, followed by pairwise Wilcoxon signed-rank tests with Bonferroni correction for multiple comparisons ( < 0.05).
During the 250 ms before movement initiation, the internal oblique/transverse abdominis, external oblique, and rectus abdominis muscles showed greater activity in the max condition compared to the 3 s and 2 s conditions (Friedman test, < 0.05), but no significant differences were found in pairwise comparisons (Wilcoxon test, > 0.05). Similarly, during the 500 ms after movement initiation, internal oblique/transverse abdominis activity was higher in the max condition, with no significant pairwise differences observed.
Faster lower limb raising velocities during active straight leg raise may enhance core stability by activating anticipatory and sustained internal oblique/transverse abdominis, external oblique, and rectus abdominis activity on the raised limb side. Training to promote this activation could improve dynamic stability in rapid or asymmetric movements.
背景/目的：主动直腿抬高需要髋、膝、骨盆和脊柱之间复杂的协调。尽管其复杂性，但在健康个体的主动直腿抬高过程中，探索下肢抬高速度与躯干肌肉运动控制之间关系的研究有限。本研究旨在探讨主动直腿抬高过程中下肢抬高速度增加对核心肌肉收缩的潜在影响。
六名健康成年男性（平均年龄：24.5±2.5岁）参与了本研究。使用放置在腹直肌、腹外斜肌和腹内斜肌/腹横肌上的表面电极记录肌电图信号。参与者以三种不同速度进行主动直腿抬高：3秒、2秒和尽可能快（最大速度）。从运动开始前250毫秒到运动开始后1000毫秒分析肌电图数据，肌肉活动以最大自主等长收缩的百分比表示。使用非参数检验进行统计分析，包括用于总体差异的Friedman检验，随后进行成对的Wilcoxon符号秩检验，并采用Bonferroni校正进行多重比较（<0.05）。
在运动开始前250毫秒期间，与3秒和2秒条件相比，腹内斜肌/腹横肌、腹外斜肌和腹直肌在最大速度条件下显示出更大的活动（Friedman检验，<0.05），但在成对比较中未发现显著差异（Wilcoxon检验，>0.05）。同样，在运动开始后500毫秒期间，腹内斜肌/腹横肌活动在最大速度条件下更高，未观察到显著的成对差异。
主动直腿抬高过程中更快的下肢抬高速度可能通过激活抬高肢体侧的预期和持续的腹内斜肌/腹横肌、腹外斜肌和腹直肌活动来增强核心稳定性。促进这种激活的训练可以改善快速或不对称运动中的动态稳定性。
