Sawada Masahiro, Kubo Yusuke, Kageyama Tetsuya, Yamashita Kohtaro, Sugiyama Shuhei, Takachu Rie, Sugiura Takeshi, Kobori Kaori, Kobori Makoto, Nejishima Makoto
Department of Rehabilitation Medicine, Kobori Orthopedic Clinic, Hamamatsu, JPN.
Department of Physical Therapy, Chuo Medical Health Vocational College, Shizuoka, JPN.
Cureus. 2024 Nov 4;16(11):e72958. doi: 10.7759/cureus.72958. eCollection 2024 Nov.
Objective This study aimed to compare the lumbar spine, pelvic alignment, and trunk muscle activity in healthy participants with and without shoulder flexion restriction in a streamlined posture. Methods The lumbar lordosis angle, pelvic anteversion angle, and trunk muscle activity were measured in 31 young, healthy men in the resting standing position. The streamlined (SL) posture and correlation analysis were performed. Multiple regression analysis was performed to analyze variables that affect the lumbar lordosis angle in the SL posture. Results Correlation analysis revealed that the lumbar lordosis angle in the SL posture had a significant negative correlation with the muscle activity of the internal oblique/transversus abdominis muscle (IO/TrA) during the SL posture (r=-0.37, p<0.045). Multiple regression analysis revealed that lumbar lordosis angle in the SL posture was associated with lumbar lordosis angle in the upright position (β=0.46), IO/TrA activity (β=-0.37), shoulder joint flexion range of motion (β=-0.37), and longissimus dorsi muscle activity during the SL posture (β=-0.28), with a Durbin-Watson statistic adjusted coefficient of determination R of 0.67 (p<0.001). Conclusion The lumbar lordosis angle in the SL posture was likely to be high when the range of motion of shoulder joint flexion was small, the activity of the longissimus dorsi muscle in the SL posture was high, and the activity of the IO/TrA was low. This suggests that limited shoulder flexion causes excessive lumbar lordosis, which may be a mechanism of low back pain in swimmers.
目的 本研究旨在比较处于简化姿势时，有无肩部屈曲受限的健康参与者的腰椎、骨盆排列及躯干肌肉活动情况。方法 对31名年轻健康男性在静息站立位时的腰椎前凸角、骨盆前倾角度及躯干肌肉活动进行测量。进行简化（SL）姿势及相关性分析。采用多元回归分析来分析影响SL姿势下腰椎前凸角的变量。结果 相关性分析显示，SL姿势下的腰椎前凸角与SL姿势期间腹内斜肌/腹横肌（IO/TrA）的肌肉活动呈显著负相关（r=-0.37，p<0.045）。多元回归分析显示，SL姿势下的腰椎前凸角与直立位时的腰椎前凸角（β=0.46）、IO/TrA活动（β=-0.37）、肩关节屈曲活动范围（β=-0.37）及SL姿势期间背阔肌活动（β=-0.28）相关，Durbin-Watson统计量调整后的决定系数R为0.67（p<0.001）。结论 当肩关节屈曲活动范围较小、SL姿势下背阔肌活动较高且IO/TrA活动较低时，SL姿势下的腰椎前凸角可能较大。这表明有限的肩部屈曲会导致腰椎前凸过度，这可能是游泳运动员腰痛的一种机制。
