The effect of intensity of interval training on fat oxidation, blood lactate and rating of perceived exertion in obese men — ASN Events
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The effect of intensity of interval training on fat oxidation, blood lactate and rating of perceived exertion in obese men (#69)

shaea alkahtani 1 , Neil King 2 , Andrew Hills 3 , Nuala Byrne 2
  1. University of Dammam, Dammam, Saudi Arabia
  2. Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, QLD, AU
  3. Mater Medical Research Institute and Griffith Health Institute, Griffith University, Brisbane, QLD, AU

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, insulin sensitivity 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.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 insulin sensitivity using the homeostasis model assessment of insulin resistance (HOMA-IR), 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. Results There were no significant changes in body composition or HOMA-IR with either intervention. There was a significant increase 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). It decreased after HIIT greater than MIIT, but 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 during HIIT greater than MIIT.