Action Analysis of Step Frequency on the Landing Characteristics of Lower Limbs During Long-Distance Running

• Main Authors: KUNG, CHEN-CHIN, 龔振欽
• Other Authors: TSENG, JUNG-GE
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/jmgag5

碩士 === 正修科技大學 === 休閒與運動管理所 === 107 === Background: Running is the simplest exercise and the first choice for general sports beginners. However, if there is no correct running technique and concept, it is easy to cause sports injuries, which makes people feel that running is not suitable for long-term exercise. Purpose: This study is to understand the running parameters and techniques to reduce the incidence of sports injuries and to improve running economy. Methods: This study is aimed at four leisure sports runners with long-term exercise habits. The Zebris FDM-T treadmill gait analysis system is used to obtain parameters under different running frequencies, namely 170, 180, 190, 200 steps per minute (spm) A high speed camera is used to record the running video which will be imported to Kinovea motion image analysis software to analyze parameters including lower limb knee flexion angle, ground contact angle, ground contact time, body vertical oscillation and plantar pressure during running. Also, single factor variance, Pearson correlation and regression trends are employed for statistical analysis. Results: In this study, under the control of the step frequency, the measured parameters of four subjects are compared from the lowest to the highest step frequencies. The knee flexion angle of the lower limbs was reduced by 1.49~6.75 degree, and the lower limb touch angle was reduced by 0.65~1.9 degree. The grounding time is reduced by 12.9~24.9 (ms), the vertical displacement of the body is reduced by 8.7~20.9 (mm), and the average plantar pressure is reduced by 13.48~68.37(N). In single factor variance analysis, the increase of step frequency with respect to the decrease of knee flexion angle, ground contact angle, ground contact time and plantar pressure are significant. Step frequency and degree of knee flexion are moderately correlated, while other parameters are highly correlated in Pearson correlation analysis. Only partially significant is found for knee flexion angle in regression analysis, and all other measurement parameters show a linear downward trend with respect to the increase of step frequency. Conclusion: This study shows that the increase of the step frequency will reduce the knee flexion angle, ground contact angle, ground contact time, body vertical displacement and average plantar pressure, etc. correspondingly. The promising results are suggested as an effective way for general casual runners to improve running economy and to reduce running injuries.