| Summary: | 碩士 === 國立臺北教育大學 === 體育學系碩士班 === 95 === Purpose：The purpose of this study was to compare the effects of bicycle seat tube angles (STA) of (72° and 82°) on EMG of the leg muscles during incremental test on cycle ergometer. Method：Ten male experienced triathletes
(age 23.70 ± 3.3 yrs；height 171.64 ± 7.65 cm；weight 69.91 ± 10.43 kg ) completed two tests respectively with the counter-balance design. During the two tests, we assessd the exercise time, muscle activation, and the angles of the joints. Result：The significant (p<.05) differences were as follows: in part of the time to exhaustion, STA82° > STA72°; in part of the joints angle, Hip angle was significantly higher at STA 82° compared to STA 72°; in part of the muscle activeation, Vastus Lateralis and Biceps Femoris activation was significantly lower at STA 82° compared to STA 72°; in part of the normalized slop data, Biceps Femoris was significantly lower at STA 82° compared to STA 72°; in part of The EMG signals of the median frequency (MF), Vastus Lateralis, Biceps Femoris and Soleus were significantly lower at STA 82° compared to STA 72°. Conclusion： The primary finding was that increasing the STA from 72° to 82° enabled triathletes to increase the exercise time, while significantly reducing the part of muscular activation.
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