Takagi Shun, Sakamoto Shizuo, Midorikawa Taishi, Konishi Masayuki, Katsumura Toshihito
a Department of Sports Medicine for Health Promotion , Tokyo Medical University , Shinjuku , Japan.
J Sports Sci. 2014;32(2):175-82. doi: 10.1080/02640414.2013.815360. Epub 2013 Sep 9.
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 60 min each at individual FATmax-intensity determined by ramp protocol (FATmax-intensity(R)), FATmax-intensity(R) ± 5% of peak oxygen uptake (VO₂peak) and FATmax-intensity(R) ± 10%VO₂peak. FATmax-intensity was determined among 5 trials at points of early exercise (10 min) and prolonged exercise (60 min) 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 60 min each after starting constant-load exercise, FATmax-intensity(R) may not be effective for prolonged exercise training.
最大脂肪氧化（MFO）率以及引发MFO的运动强度（脂肪最大氧化强度，FATmax强度）旨在评估脂肪代谢能力，并为个体在长时间运动期间提供目标运动强度。然而，先前确定FATmax强度的方法耗时较长。本研究的目的是检验通过短时间测试确定的FATmax强度的有效性。九名健康年轻男性在短时间测试中进行递增运动直至力竭，并在由递增方案确定的个体FATmax强度（FATmax强度（R））、FATmax强度（R）±峰值摄氧量（VO₂峰值）的5%以及FATmax强度（R）±VO₂峰值的10%下分别进行5次每次60分钟的恒负荷运动。在5次试验中的早期运动（10分钟）和长时间运动（60分钟）阶段确定FATmax强度，以评估FATmax强度（R）的有效性。在开始恒负荷运动10分钟后，FATmax强度（R）在5次试验中显示出最高的脂肪氧化，尽管递增方案得出的MFO被高估了。因此，在常规递增测试中纳入FATmax强度的测量可能有助于评估脂肪代谢。然而，由于在开始恒负荷运动后，FATmax强度（R）在每次60分钟的5次试验中并未引发最高的脂肪氧化，所以FATmax强度（R）可能对长时间运动训练无效。
