走幅跳における踏切の動作解析の検討

The purpose of present study was to examine motion analysis for long jump by using personal devices. After takeoff, increased knee flexion speed of takeoff leg caused fall of the trunk. During takeoff phase, the deep knee flexion caused slow speed of approach run. It brought bad result. Just after takeoff, powerful pulling action of arm of opposite from takeoff leg, it raised the trunk. It produces good result. In conclusion, motion analysis by using personal devices produces useful information of sports skill and training

自転車エルゴメータ駆動時の負荷が力効率指数に及ぼす影響

The purpose of this study was to investigate the effect of exercise intensity on index of effectiveness (IE) during bicycle ergometer cycling. Four healthy males and one experienced cyclist performed incremental exercise on an electrically braked cycle ergometer. For measuring crank angle, pedal forces and pedal angles, rotary encoders and triaxis force sensors were mounted on the ergometer. The resultant pedal force (FR) and the force perpendicular component of the crank (FE) were calculated. IE was calculated from the ratio of FE to FR. The work load was increased 20 W every 15 sec until they could not maintain pedalling at 90 rpm. As exercise intesity was increased, IE during whole one cycle (0～360 deg ; tIE) and up phase (180～360 deg ; uIE) increased lineary, and IE during down phase (0～180 deg ; dIE) increased logarithmically. lE\u27s at 50% of maximal work rate in the experienced cyclist were higher than other subjects. This result suggested that IE should be evaluated by relative work load