Abstract:

 In order to revealregularities of the change of human body size and the deformation of the skin during cycling, the paper firstly used the OptiTrack motion capture system to get the position change of the human body marker point iand track of motion in the cycling movement, and analyze qualitatively the dynamic change of the human body. And then the regularities of leg skin deformation were further strdied by lineation-on-body experiment. It is found that the fluctuation of the markers and human body size in the waist and above is slight change, the change fluctuationof the lower is larger than above the waist, especially in the knee, and the change of the vertical direction is greater than that in the horizontal direction. Furthermore, the results show that the change of the leg is complicated and differences in the changes exist on different regions during cycling, the change rate of girth is in the range of -8% to 16% and the length is in the range of -60%, 40%. The change of knee is the most obvious and the maximum change rate is about -60%, and the change of thigh and lower leg is small.

Key words: cycling motion, motion capture, human body, skin deformation