| Summary: | 碩士 === 臺北巿立體育學院 === 運動科學研究所 === 91 === The purposes of this study were to examine the relationship of reaction time in heel rising with related posture, stretch reflex, muscle fitness or range of motion.
Recruited were forty university students who did habitual exercise（19~23 years old, more than 3 days/week, more than 30 mins/day）. No disturbance existed before experiment, and sequences of measurement were randomized. Product-moment correlation of Carl Pearson were to used determine correlations between variables. The t-test and one-way ANOVA with a repeated design were used to test the reaction time of different conditions.
Findings were as follows：
（1）posture affects MRT（motor reaction time）more then PMRT（premotor reaction time）. All MRT, PMRT, and RT, of sitting were firstest, of readiness posture were slower, and of standing is the slowest.
（2）the subjects whose muscle strength were stronger had a faster MRT of sitting, and a slower PMRT of readiness posture and standing than the others. This is significance.
（3）the subjects who had better muscle endurance had a slower MRT of sitting, readiness posture, and standing than the others, but this is no significance.
（4）there was no correlation between reaction time and stretch reflex.
（5）the subjects whose dorsi-flexion angle were larger had a faster PMRT of sitting, and MRT of standing than the others. There was no correlation between reaction time and plant-flexion angle.
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