Electromyographic Analysis of Lower Extremity for Road Bike Training Under Different Pedaling Rates and Bike Frames Setting

Autor: Horng-Jer Shieh, 謝弘哲
Rok vydání: 2018
Druh dokumentu: 學位論文 ; thesis
Popis: 106
The aim of this study is to compare the lower extremity EMG changes in different pedaling rates and frame settings of road bike at fixed training platform, and then explore the best pedaling rate. Five recreational road bike riders were recruited in this study. Four pedaling rates 60, 70, 80, and 90 rpm, with the three frames setting (top tube length 530, 560, and 590 mm) were counterbalanced. Surface EMG signals of rectus femoris (RF), biceps femoris (BF), gluteus maximus (GMax), tibialis anterior (TA), gastrocnemius medialis (GM), gastrocnemius lateralis (GL), soleus (SOL) muscles, and the knee joint angle during the pedaling cycle were measured. Repeated measures two-way ANOVA was applied to analyze the lower extremity EMG under the twelve experimental designs. By the two-stage analysis of the lifting section and the stepping section, the statistical analysis results showed that under the α=0.05 significant level, (1) the two-factor interaction between the frame setting and the pedaling frequency, (2) the main effects of the pedaling frequency factor, and (3) The main effect of the frame setting factor could not be confirmed by this research experiment. In the comparison of frame settings, muscle activation in BF and TA at 530 mm was significantly lower than the frame 560 mm during the lifting section. The short frame length of the upper tube reduced the muscle activation during the lifting section, resulting in better riding efficiency. In the paired comparisons of pedaling rates, when the muscle activation of TA for the pedaling rate of 70 rpm was significantly lower than the pedaling rate of 100 rpm. The low pedaling rate can reduce the activation of the TA muscle at the stepping stage, In conclusion, for recreational road bike riders in present study, a shorter frame setting at 530mm and a lower pedaling rate at 70 rpm are the most appropriate combination. Keyword: Cycling Sport、Bike Fitting、EMG
Databáze: Networked Digital Library of Theses & Dissertations
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