Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
from September 2014
©Journal of Sports Science and Medicine (2014) 13, 51 - 58

Research article
Comparing Fat Oxidation in an Exercise Test with Moderate-Intensity Interval Training
Shaea Alkahtani 
Author Information
Institute of Health and Biomedical Innovation, Queensland University of Technology, Australia & University of Dammam, Saudi Arabia

Shaea Alkahtani
✉ PO Box 2375 Dammam 31451, Saudi Arabia
Publish Date
Received: 05-07-2013
Accepted: 05-09-2013
Published (online): 20-01-2014
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This study compared fat oxidation rate from a graded exercise test (GXT) with a moderate-intensity interval training session (MIIT) in obese men. Twelve sedentary obese males (age 29 ± 4.1 years; BMI 29.1 ± 2.4 kg·m-2; fat mass 31.7 ± 4.4 %body mass) completed two exercise sessions: GXT to determine maximal fat oxidation (MFO) and maximal aerobic power (VO2max), and an interval cycling session during which respiratory gases were measured. The 30-min MIIT involved 5-min repetitions of workloads 20% below and 20% above the MFO intensity. VO2max was 31.8 ± 5.5 ml·kg-1·min-1 and all participants achieved ≥ 3 of the designated VO2max test criteria. The MFO identified during the GXT was not significantly different compared with the average fat oxidation rate in the MIIT session. During the MIIT session, fat oxidation rate increased with time; the highest rate (0.18 ± 0.11 g·min- 1) in minute 25 was significantly higher than the rate at minute 5 and 15 (p ≤ 0.01 and 0.05 respectively). In this cohort with low aerobic fitness, fat oxidation during the MIIT session was comparable with the MFO determined during a GXT. Future research may consider if the varying workload in moderate-intensity interval training helps adherence to exercise without compromising fat oxidation.

Key words: Interval exercise, FAT, maximal fat oxidation, obesity

           Key Points
  • Fat oxidation during interval exercise is not com-promised by the undulating exercise intensity
  • Physiological measures corresponding with the MFO measured during the GXT correlated well to the MIIT
  • The validity of exercise intensity markers derived from a GXT to reflect the physiological responses during MIIT.
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