Division of Sports Science, Konkuk University, Chungju, South Korea.
Sports Biomech. 2012 Jun;11(2):197-211. doi: 10.1080/14763141.2012.670662.
This study estimated the lumbar spinal loads at the L4-L5 level and evaluated electromyographic (EMG) activity of right and left rectus abdominis, external and internal obliques, erector spinae, and latissimus dorsi muscles during a golf swing. Four super VHS camcorders and two force plates were used to obtain three-dimensional (3D) kinematics and kinetics of golf swings performed by five male collegiate golfers. Average EMG levels for different phases of golf swing were determined. An EMG-assisted optimization model was applied to compute the contact forces acting on the L4-L5. The results revealed a mean peak compressive load of over six times the body weight (BW) during the downswing and mean peak anterior and medial shear loads approaching 1.6 and 0.6 BW during the follow-through phases. The peak compressive load estimated in this study was high, but less than the corresponding value (over 8 BW) reported by a previous study. Average EMG levels of different muscles were the highest in the acceleration and follow-through phases, suggesting a likely link between co-contractions of paraspinal muscles and lumbar spinal loads.
本研究旨在评估高尔夫挥杆过程中 L4-L5 节段的腰椎脊柱负荷，并分析右侧和左侧腹直肌、腹外斜肌、腹内斜肌、竖脊肌和背阔肌的肌电图（EMG）活动。本研究使用四台超 VHS 摄像机和两台测力板来获取五名男性大学生高尔夫球手的挥杆运动的三维（3D）运动学和动力学数据。确定了高尔夫挥杆不同阶段的平均 EMG 水平。应用肌电图辅助优化模型计算作用于 L4-L5 的接触力。结果显示，在下挥杆过程中，平均峰值压缩力超过体重（BW）的六倍，在随挥阶段，平均峰值前向和内侧剪切力接近 1.6 和 0.6 BW。与之前的研究（超过 8 BW）相比，本研究中估计的峰值压缩力较高，但仍低于相应值。不同肌肉的平均 EMG 水平在加速和随挥阶段最高，这表明脊柱旁肌肉的协同收缩与腰椎脊柱负荷之间可能存在联系。
