| Summary: | 碩士 === 國立成功大學 === 體育健康與休閒研究所 === 100 === According to previous studies, it has been found that there are differences between treadmill running and overground running for kinematic and kinetic parameters. Therefore, it seemed to be inappropriate to apply the results of treadmill running to overground running. Treadmill movement should be regarded as a new motion mode, and establishing the treadmill motion pattern will be necessary in the future. The purpose of this research is to investigate how the runners control their center of mass in safety region of the treadmill deck as the treadmill speed is changing. A motion capture system (visualeyes4000) was used in this study to capture the kinematics of the thirteen subjects who were asked to run on a motor driven treadmill for ten minutes. The protocol of the speed change is as following: up to 10 km/hr in 2mins, 10 km/hr to 11 km/hr after 4mins, 11 km/hr to 10 km/hr after 6mins, 10 km/hr to 9km/hr after 8mins, 9 km/hr to 10 km/hr after 10mins. The phase angle and bilateral limb angle of the bilateral heel movement were calculated and analyzed at heel strike (HS) and toe off (TO) events of right and left foot.
The results showed that the center of mass of the runners had a little shift during the ten minutes of treadmill running. As the speed increased, the phase angles of bilateral foot were significantly greater in transition phase than those in steady state. As the speed decreased, the phase angles of bilateral foot were significantly smaller in transition phase than those in steady state. However, the phase angle of bilateral foot will go back to stationary region from 1510 to 1570 in the following steady state phase. It seemed to be suggested that the runner seemed to adjust their relative movement of bilateral foot to control their center of mass in the safety region as the treadmill speed changed.
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