| Summary: | 碩士 === 國立臺灣師範大學 === 體育學系 === 96 === Purpose: To investigate the effect of gradual intensity decrement long duration running on fat metabolism and energy expenditure. Methods: Twelve healthy male served as subjects (age:25.2 ± 2.4 yrs ; height:176.9 ± 6.6 cm ; weight: 70.2 ± 9.0 kg ; BMI:22.5 ± 3.8 kg/m2 ; body fat %:17.6 ± 5.2 % ; VO2max:48.2 ± 5.3 ml/kg/min). Subjects performed the same duration (60 min) treadmill running with constant intensity exercise (CIE) and with gradual intensity decrement exercise (GDE). A repeated-measures design (seven days apart) was used, and the testing order was counter balanced. All numerical data were expressed in mean + SD. Repeated measures one-way ANOVA and Student’s paired t-test were used for statistical analysis (SPSS 13.0). The significance level was set at p <.05. Results: CIE was significantly higher than GDE on the 20~30、40~50、50~60 min of the energy expenditure (122.8 ± 26.9 kcal v.s. 114.1 ± 24.3 kcal ; 124.1 ± 23.5 kcal v.s. 103.0 ± 23.8 kcal ; 124.9 ± 23.6 kcal v.s. 102.8 ± 25.3 kcal). CIE was significantly higher than GDE of the accumulate energy expenditure (736.2 ± 149.3 kcal v.s. 673.0 ± 137.5 kcal). CIE was significantly higher than GDE total energy expenditure (1600.1 ± 323.7 kcal v.s. 1283.3 ± 228.0 kcal). On fat metabolism, the RER of GDE was significantly lower than CIE on the 40~50 and 50~60 min (0.80 ± 0.06 v.s. 0.83 ± 0.06 ; 0.79 ± 0.06 v.s. 0.83 ± 0.06). Fat as the fuel of energy expenditure, two patterns had no significant differences. The total fat metabolism and the ratio of fat utilization also had no significant differences. Both CIE and GDE increase fat metabolism as exercise duration increase. On the rating of perceived exertion (RPE), GDE was significantly lower than CIE on the 20~30、30~40、40~50、50~60 min (10.6 ± 1.4 v.s. 12.0 ± 1.9 ; 10.8 ± 1.9 v.s. 12.3 ± 2.2 ; 10.4 ± 2.2 v.s. 12.7 ± 2.4 ; 10.3 ± 2.4 v.s. 13.0 ± 2.6). Conclusions: Although CIE expensed more calorie than GDE, it was not significantly higher than GDE on fat metabolism. Both CIE and GDE increase fat metabolism as exercise duration increase. However, due to the decrease of exercise intensity, GDE would make it easier to increase exercise duration. Therefore, GDE is an alternative mode of exercise for weight loss.
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