title: Determination of the exercise intensity that elicits maximal fat oxidation in short-time testing.
abstract: 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.
authors.affiliation: a Department of Sports Medicine for Health Promotion , Tokyo Medical University , Shinjuku , Japan.
authors.forename: Shun
authors.initials: S
authors.lastname: Takagi
authors.forename: Shizuo
authors.initials: S
authors.lastname: Sakamoto
authors.forename: Taishi
authors.initials: T
authors.lastname: Midorikawa
authors.forename: Masayuki
authors.initials: M
authors.lastname: Konishi
authors.forename: Toshihito
authors.initials: T
authors.lastname: Katsumura
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism*; D000328:Adult; D002153:Calorimetry, Indirect / Q000379:methods* / Q000592:standards; D004734:Energy Metabolism / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D050356:Lipid Metabolism; D008297:Male; D010084:Oxidation-Reduction; D010101:Oxygen Consumption; D005082:Physical Exertion / Q000502:physiology*; D015203:Reproducibility of Results; D055815:Young Adult