Determination of the exercise intensity that elicits maximal fat oxidation in short-time testing

作者：Takagi Shun^*; Sakamoto Shizuo; Midorikawa Taishi; Konishi Masayuki; Katsumura Toshihito

来源：Journal of Sports Sciences, 2014, 32(2): 175-182.

DOI：10.1080/02640414.2013.815360

• ramp exercise
• exercise testing
• steady-state exercise
• hormonal response
• fat metabolism

Maximal fat oxidation (MFO) rate and the exercise intensity that elicits MFO (FATmax-intensity) were designed to evaluate fat metabolism capacity and to provide individuals with a target exercise intensity during prolonged exercise. However, the previous methods of determining FATmax-intensity were time-consuming. The purpose of this study was to examine the validity of FATmax-intensity determined by short-time testing. Nine healthy young men performed ramp exercise, in a short-time test, until exhaustion and 5 constant-load exercises of 60min each at individual FATmax-intensity determined by ramp protocol (FATmax-intensity((R))), FATmax-intensity((R))+/- 5% of peak oxygen uptake (VO(2)peak) and FATmax-intensity((R))+/- 10%VO(2)peak. FATmax-intensity was determined among 5 trials at points of early exercise (10min) and prolonged exercise (60min) to evaluate the validity of FATmax-intensity((R)). Ten minutes after starting constant-load exercise, FATmax-intensity((R)) showed the highest fat oxidation among 5 trials, even though MFO by ramp protocol was overestimated. Therefore, it may be useful for evaluation of fat metabolism to include the measurement of the FATmax-intensity in a routine ramp test. However, because FATmax-intensity((R)) did not elicit the highest fat oxidation among 5 trials of 60min each after starting constant-load exercise, FATmax-intensity((R)) may not be effective for prolonged exercise training.

• 出版日期2014-1-20