| （Department of Sports Biomechanics，Beijing Sport University，Beijing 100084，China) Abstract: In order to study the characteristics of the gait of human walking when the trunk is loaded in different ways, and to probe into the effects of different ways of trunk load bearing on the gait, the authors selected 10 ordinary university stu-dents as the testees, who wore a specially made load rack and walked respectively under such 3 conditions as trunk basic load bearing, trunk front load bearing and trunk back load bearing, used a Kistler 3D force measuring platform and an in-frared high speed motion capture system to synchronously collect kinematic and dynamic data. The authors revealed the following findings: during walking, as compared with back load bearing, front load bearing significantly increased step width, horizontal swinging amplitude of center of gravity, maximum ankle dorsiflexion angle, maximum hip extension an-gle, maximum hip extension moment, hip positive work, maximum knee extension moment and knee negative work, and significantly decreased step length, trunk back and forth leaning amplitude, and maximum ankle plantar flexion moment. The authors drew the following conclusions: when walking with front load bearing, the human body has a smaller step length and a bigger step width, which will cause more energy consumption; the leaning backward of the trunk makes lower back muscles fatigue more easily, and tends to cause the occurrence of lower back pain and if it keeps happening; in the mean time, thigh muscles increase power exertion, consume more energy, fatigue faster when walking for a long time; when designing a biped walking robot with front load bearing, the designer should appropriately adjust corresponding pa-rameters and increase driving power, so as to meet more energy consumption.
Key words: sports biomechanics；way of load bearing；walking；trunk |
