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Purpose  The objectives of this study were to examine the effect of 4-week moderate- and high-intensity interval training (MIIT and HIIT) on fat oxidation and the responses of blood lactate (BLa) and rating of perceived exertion (RPE).    Methods  Ten overweight/obese men (age = 29 ±3.7 years, BMI = 30.7 ±3.4 kg/m 2 ) participated in a cross-over study of 4-week MIIT and HIIT training. The MIIT training sessions consisted of 5-min cycling stages at mechanical workloads 20% above and 20% below 45%VO 2peak . The HIIT sessions consisted of intervals of 30-s work at 90%VO 2peak  and 30-s rest. Pre- and post-training assessments included VO 2max  using a graded exercise test (GXT) and fat oxidation using a 45-min constant-load test at 45%VO 2max . BLa and RPE were also measured during the constant-load exercise test.    Results  There were no significant changes in body composition with either intervention. There were significant increases in fat oxidation after MIIT and HIIT (p ≤ 0.01), with no effect of intensity. BLa during the constant-load exercise test significantly decreased after MIIT and HIIT (p ≤ 0.01), and the difference between MIIT and HIIT was not significant (p = 0.09). RPE significantly decreased after HIIT greater than MIIT (p ≤ 0.05).    Conclusion  Interval training can increase fat oxidation with no effect of exercise intensity, but BLa and RPE decreased after HIIT to greater extent than MIIT.

Effect of interval training intensity on fat oxidation, blood lactate and the rate of perceived exertion in obese men