Abstract：
OBJECTIVE: The present study aimed to analyze the influence of muscle activation on lumbar injury under a specific +Gz load.
METHODS: A hybrid finite element human body model with detailed lumbar anatomy and lumbar muscle activation capabilities was developed. Using the specific +Gz loading acceleration as input, the kinematic and biomechanical responses of the occupant\'s lower back were studied for both activated and deactivated states of the lumbar muscles.
RESULTS: The results indicated that activating the major lumbar muscles enhanced the stability of the occupant\'s torso, which delayed the contact between the occupant\'s head and the headrest. Lumbar muscle activation led to higher strain and stress output in the lumbar spine under +Gz load, such as the maximum Von Mises stress of the vertebrae and intervertebral discs increased by 177.9% and 161.8%, respectively, and the damage response index increased by 84.5%.
CONCLUSIONS: In both simulations, the occupant\'s risk of lumbar injury does not exceed 10% probability. Therefore, the activation of muscles could provide good protection for maintaining the lumbar spine and reduce the effect of acceleration in vehicle travel direction.
METHODS: A hybrid finite element human body model with detailed lumbar anatomy and lumbar muscle activation capabilities was developed. Using the specific +Gz loading acceleration as input, the kinematic and biomechanical responses of the occupant\'s lower back were studied for both activated and deactivated states of the lumbar muscles.
RESULTS: The results indicated that activating the major lumbar muscles enhanced the stability of the occupant\'s torso, which delayed the contact between the occupant\'s head and the headrest. Lumbar muscle activation led to higher strain and stress output in the lumbar spine under +Gz load, such as the maximum Von Mises stress of the vertebrae and intervertebral discs increased by 177.9% and 161.8%, respectively, and the damage response index increased by 84.5%.
CONCLUSIONS: In both simulations, the occupant\'s risk of lumbar injury does not exceed 10% probability. Therefore, the activation of muscles could provide good protection for maintaining the lumbar spine and reduce the effect of acceleration in vehicle travel direction.
摘要：
目的：本研究的目的是分析特定Gz负荷下肌肉激活对腰椎损伤的影响。
方法：开发了具有详细的腰椎解剖结构和腰椎肌肉激活能力的混合有限元人体模型。使用特定的+Gz加载加速度作为输入，研究了乘员下背部在腰部肌肉激活和失活状态下的运动学和生物力学反应。
结果：结果表明，激活主要的腰部肌肉可以增强乘员躯干的稳定性，这延迟了乘员头部和头枕之间的接触。腰肌激活导致+Gz负荷下腰椎更高的应变和应力输出，如椎骨和椎间盘的最大Von-Mises应力分别增加了177.9%和161.8%,分别,损伤响应指数提高了84.5%。
结论：在两个模拟中，乘员腰部受伤的风险不超过10%。因此,肌肉的激活可以为腰椎的维护提供良好的保护，并减少车辆行驶方向的加速度的影响。
方法：开发了具有详细的腰椎解剖结构和腰椎肌肉激活能力的混合有限元人体模型。使用特定的+Gz加载加速度作为输入，研究了乘员下背部在腰部肌肉激活和失活状态下的运动学和生物力学反应。
结果：结果表明，激活主要的腰部肌肉可以增强乘员躯干的稳定性，这延迟了乘员头部和头枕之间的接触。腰肌激活导致+Gz负荷下腰椎更高的应变和应力输出，如椎骨和椎间盘的最大Von-Mises应力分别增加了177.9%和161.8%,分别,损伤响应指数提高了84.5%。
结论：在两个模拟中，乘员腰部受伤的风险不超过10%。因此,肌肉的激活可以为腰椎的维护提供良好的保护，并减少车辆行驶方向的加速度的影响。
