The influence of bike positioning on joint angle variations and pedaling power performance

• Main Authors: Lee, Hui-Shan, 李慧珊
• Other Authors: Wu, Chih-Min
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/kcyze3

碩士 === 正修科技大學 === 休閒與運動管理所 === 106 === In the process of long-time cycling, the seat height either too high or too low may lead to wrong riding posture which then causes the fatigue accumulation rapidly and even led to sports injuries. This problem would directly affect the riding performance of the cyclist. Purpose: To investigate the effect of cycling posture correction on joint angle differences and pedaling power. Methods: Seven male amateur experienced road cycling cyclists were volunteered to participate in this study. The subjects cycling experience were 2-8 years. The bicycles of the experiment were equipped with Garmin-VectorTW2 pedaling power meter to collect power data, and video recording for motion analysis. The joints angles were analyzed by Kinovea program. In this study, the variance analysis ANOVA was conducted to detect during 5-minute sprint (1) the differences between the average joint angle of the first minute sprint and the average joint angle of the fifth minute sprint before and after the posture correction, (2) the differences between the speed, power and cadence before and after the posture correction. The significant level value is set to α=.05. Results: The average joint angle of the first minute sprint and the fifth minute sprint after posture correction elbow, shoulder, pelvis, knee, ankle joint in Top dead center, Push period, Bottom dead point, Pull-up period variants difference wert not significantly. The average cadence(F=0.197, p>.05), the highest cadence(F=0.086, p>.05), the Normalized Power(F=0.066, p>.05), the average power(F=0.047, p>.05), and the maximum power(F=0.040, p>.05). Conclusion: After the LeMond method positioning, the angle variation , power and cadence performance are not significantly improved, but the ride comfort of the athlete is improved. we suggest the future study of similar experiments can be conducted with other height settings to find the most suitable seat height setting.