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

Abstract

PurposeThe 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).MethodsTen overweight/obese men (age = 29 ±3.7 years, BMI = 30.7 ±3.4 kg/m2) 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%VO2peak. The HIIT sessions consisted of intervals of 30-s work at 90%VO2peak and 30-s rest. Pre- and post-training assessments included VO2max using a graded exercise test (GXT) and fat oxidation using a 45-min constant-load test at 45%VO2max. BLa and RPE were also measured during the constant-load exercise test.ResultsThere 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).ConclusionInterval training can increase fat oxidation with no effect of exercise intensity, but BLa and RPE decreased after HIIT to greater extent than MIIT.

Rating of Perceived Exertion and Serum Leptin Responses to Maximal Exercise in Obese Female Adolescents: Effects of Exercise Training Intensity

“…In this context, we have to note that HIIT group had the greater decrease in the RPE score, which corroborates with the findings of a recent study (Alkahtani et al, 2013). Therefore, we can conclude that the two types of training program reflected a decrease in plasma leptin levels.…”

“…Further, both training modalities enhanced positively the plasma leptin levels which were based on supplementary energy expenditure leading to the body fat mass decrease. As recently demonstrated (Alkahtani et al, 2013), the interval training intensity in the current study (HIIT and MIIT) helped to decrease fasting plasma glucose levels in both groups. This is due to the enhancement of insulin sensitivity (Host et al 1998), shown in the following study by a decrease in HOMA-IR.…”

High-intensity intermittent training versus moderate-intensity intermittent training: is it a matter of intensity or intermittent efforts?

“…Alkahtani et al 5 examined the effect of 4-week MIIT and HIIT on fat oxidation and the responses of blood lactate and rating of perceived exertion in obese men. The MIIT protocol alternated cycling stages (1:1) between 25% and 65% of mechanical workloads, while HIIT combined stages of work (1:1) at 90% with rest.…”

The Effect of a Short-Term High-Intensity Circuit Training Program on Work Capacity, Body Composition, and Blood Profiles in Sedentary Obese Men: A Pilot Study

“…Both types of exercise have been prescribed to sedentary and obese individuals, and resulted in improved blood pressure (BP), heart rate (HR), body composition, biochemical markers (insulin, glucose, cholesterol, etc. ), and strength [6–15]. Combination training (i.e., aerobic and resistance training combined) appears to have a greater effect on BP, arterial stiffness, body composition, and ${\dot{\text{V}}\text{O}}_{\text{2max}}$ than performing either type of exercise independently [13, 14].…”