This study was designed to identify the maximal fat oxidation exercise intensity(MFOEI) during graded maximal exercise test(GXT) performed utilizing the cycle ergometer. Additionally, this study was intended to compare fat oxidation-related variables obtained during submaximal exercise performed at ...
This study was designed to identify the maximal fat oxidation exercise intensity(MFOEI) during graded maximal exercise test(GXT) performed utilizing the cycle ergometer. Additionally, this study was intended to compare fat oxidation-related variables obtained during submaximal exercise performed at MFOEI by aerobic capacity(AC). Twenty healthy male university students were volunteered to participate in this study. They were randomly assigned to one of two groups, i.e., high AC group(n=11) and low AC group(n=9). Following an overnight fast, subjects completed graded maximal exercise test to determine MFOEI, and submaximal exercise test at MFOEI on separate days. The GXT was performed utilizing the cycle ergometer, and 25W was increased every 2-min stage until exhaustion. Expired gases were collected and analyzed each 1 min using QMC(USA). The MFOEI was defined as the intensity at which fat oxidation was maximal. Fat kilocalorie per minute(Fkcal) was determined by converting VO2 to Fkcal at each cycle exercise stage using RER(respiratory exchange ratio) and a Lusk table. Submaximal test was performed at MFOEI, and each subject was asked to cycle for 40minutes at 60 rpm during the test. The mean MFOEI of two groups was compared utilizing independent t-test. In addition, fat oxidation-related variables obtained during 40-min submaximal exercise test was compared using two-way repeated ANOVA. The results of this study are as follows : 1. There was significant difference in VO2max between high AC group(52.1±3.48ml/kg/min) and low AC group(41.5±5.96ml/kg/min) (p<0.05). 2. There was no significant difference in %VO2max, %HRmax, and %VT which indicate the MFOEI between the two groups. 3. There was no significant difference in VO2, RER, HR and Fkcal between two groups. However, total kilocalorie per minute(Tkcal) obtained at MFOEI was significantly higher in high AC group(6.63± 1.75kcal/min) than low AC group(5.01±1.49kcal/min)(p<0.05). 4. VO2 and Tkcal were significantly higher in thigh AC group than low AC group throughout the submaximal exercise test performed for 40 minutes at MFOEI, except at 10 minute during the test. % fat oxidation and Fkcal were significantly higher in high AC group than low AC group, while RER was significantly lower in hgh AC group than low AC group throughout the test(p<0.05). 5. There was no significant difference between two groups in average of four means of all variables obtained at each time during 40-min submaximal exercise test, except VO2(1.47±0.36 vs. 1.16±0.24L/min), Tkcal(7.08±1.76 vs. 5.65±1.25Kcal/min), Fkcal(4.56±1.13 vs. 2.82± 0.78Kcal/min) were significantly higher in high AC group than low AC group(p<0.05). 6. There was significantly negative relationship between fat oxidation-related variables and RER obtained during submaximal exercise in both groups. And there was significantly positive relationship between VO2max and Fkcal(r=.495 ; p=.027). VO2 was negatively related with Tkcal in low AC group, while VO2 was positively related with Tkcal in high AC group. It was concluded that exercise intensity for weight regulation should be prescribed according to fitness level of each individual.
This study was designed to identify the maximal fat oxidation exercise intensity(MFOEI) during graded maximal exercise test(GXT) performed utilizing the cycle ergometer. Additionally, this study was intended to compare fat oxidation-related variables obtained during submaximal exercise performed at MFOEI by aerobic capacity(AC). Twenty healthy male university students were volunteered to participate in this study. They were randomly assigned to one of two groups, i.e., high AC group(n=11) and low AC group(n=9). Following an overnight fast, subjects completed graded maximal exercise test to determine MFOEI, and submaximal exercise test at MFOEI on separate days. The GXT was performed utilizing the cycle ergometer, and 25W was increased every 2-min stage until exhaustion. Expired gases were collected and analyzed each 1 min using QMC(USA). The MFOEI was defined as the intensity at which fat oxidation was maximal. Fat kilocalorie per minute(Fkcal) was determined by converting VO2 to Fkcal at each cycle exercise stage using RER(respiratory exchange ratio) and a Lusk table. Submaximal test was performed at MFOEI, and each subject was asked to cycle for 40minutes at 60 rpm during the test. The mean MFOEI of two groups was compared utilizing independent t-test. In addition, fat oxidation-related variables obtained during 40-min submaximal exercise test was compared using two-way repeated ANOVA. The results of this study are as follows : 1. There was significant difference in VO2max between high AC group(52.1±3.48ml/kg/min) and low AC group(41.5±5.96ml/kg/min) (p<0.05). 2. There was no significant difference in %VO2max, %HRmax, and %VT which indicate the MFOEI between the two groups. 3. There was no significant difference in VO2, RER, HR and Fkcal between two groups. However, total kilocalorie per minute(Tkcal) obtained at MFOEI was significantly higher in high AC group(6.63± 1.75kcal/min) than low AC group(5.01±1.49kcal/min)(p<0.05). 4. VO2 and Tkcal were significantly higher in thigh AC group than low AC group throughout the submaximal exercise test performed for 40 minutes at MFOEI, except at 10 minute during the test. % fat oxidation and Fkcal were significantly higher in high AC group than low AC group, while RER was significantly lower in hgh AC group than low AC group throughout the test(p<0.05). 5. There was no significant difference between two groups in average of four means of all variables obtained at each time during 40-min submaximal exercise test, except VO2(1.47±0.36 vs. 1.16±0.24L/min), Tkcal(7.08±1.76 vs. 5.65±1.25Kcal/min), Fkcal(4.56±1.13 vs. 2.82± 0.78Kcal/min) were significantly higher in high AC group than low AC group(p<0.05). 6. There was significantly negative relationship between fat oxidation-related variables and RER obtained during submaximal exercise in both groups. And there was significantly positive relationship between VO2max and Fkcal(r=.495 ; p=.027). VO2 was negatively related with Tkcal in low AC group, while VO2 was positively related with Tkcal in high AC group. It was concluded that exercise intensity for weight regulation should be prescribed according to fitness level of each individual.
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