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着陆冲击是载人飞船返回着陆必然要遇到的动力学因素，而胸部疼痛是人体对＋Ｇｘ着陆冲击的主要反应之一。为了研究胸部在＋Ｇｘ着陆冲击下的动态响应情况，做了３６人次的＋Ｇｘ冲击实验，实验中同时测量了冲击加速度和人体胸部的响应加速度。根据实验测量结果建立了人体胸部的动力学响应模型，模型计算的响应结果与实验测量的结果符合良好。用该模型计算了高６值＋Ｇｘ冲击下胸部的动力学响应，并根据计算结果推导出３５Ｇｘ作为＋Ｇｘ冲击胸部损伤的响应加速度限值，这个推导出的限值可以为胸部冲击损伤耐受限值的研究提供参考，本研究表明胸部的冲击响应具有非线性的特点，另外，为了减小胸部响应加速度的超调量，应避免使冲击加速度脉宽的倒数接近人体胸部的固有频率。
The landing impact is the kinetic factor that the manned spacecraft must encounter when returning to land. Chest pain is one of the main reactions of the human body to the + Gx landing impact. In order to study the dynamic response of the chest under the + Gx landing impact, 36 person-times of + Gx impact experiments were performed in which both the impact acceleration and the body’s chest response acceleration were measured. According to the experimental results, the dynamic response model of the human chest is established. The calculated response of the model is in good agreement with the experimental results. The model was used to calculate the dynamic responses of the thorax under the high-value + Gx impact and to derive the 35Gx as the response acceleration limit of the + Gx-impact thoracic injury based on the calculated results. The derived limit can be the thorax impingement injury tolerance limit This study shows that the impact response of the chest is non-linear. In addition, in order to reduce the overshoot of the chest response acceleration, the reciprocal of the impact acceleration pulse width should be avoided to be close to the natural frequency of the human chest.