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J Appl Physiol (December 14, 2006). doi:10.1152/japplphysiol.01098.2006
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Submitted on September 29, 2006
Accepted on December 7, 2006

TWO WEEKS OF HIGH-INTENSITY AEROBIC INTERVAL TRAINING INCREASES THE CAPACITY FOR FAT OXIDATION DURING EXERCISE IN WOMEN

Jason L Talanian1*, Stuart D.R. Galloway2, George J.F. Heigenhauser3, Arend Bonen1, and Lawrence L. Spriet1

1 Human Health and Nutritional Sciences, University of Guelph, Guelph, Canada
2 Department of Sport Studies, University of Stirling, Stirling, Scotland, United Kingdom
3 Department of Medicine, McMaster University, Hamilton, Canada

* To whom correspondence should be addressed. E-mail: jtalania{at}uoguelph.ca.

Our aim was to examine the effects of seven high intensity aerobic interval training (HIIT) sessions over two weeks on skeletal muscle fuel content, mitochondrial enzyme activities, fatty acid transport proteins, VO2peak, and whole body metabolic, hormonal and cardiovascular responses to exercise. Eight females participated in the study (22.1 ± 0.2 yrs, 65.0 ± 2.2 kg, VO2peak: 2.36 ± 0.24 l·min-1). Subjects performed a VO2peak test and a 60-min cycling trial at ~60% VO2peak prior to and following training. Each session consisted of ten, 4-min bouts at ~90% VO2peak with 2-min rest between intervals. Training increased VO2peak by 13%. Following HIIT, plasma epinephrine and heart rate were lower during the final 30-min of the 60-min cycling trial at ~60% pre-training VO2peak. Exercise whole body fat oxidation (PRE: 15.0 ± 2.4, POST: 20.4 ± 2.5 g) increased 36% following HIIT. Resting muscle glycogen and triacylglycerol contents were unaffected by HIIT, but net glycogen use was reduced during the post-training 60-min cycling trial. HIIT significantly increased muscle mitochondrial {beta}-HAD (PRE: 15.44 ± 1.57, POST: 20.35 ± 1.40 mmol·min-1·kg wm-1) and citrate synthase (PRE: 24.45 ± 1.89, POST: 29.31 ± 1.64 mmol·min-1·kg wm-1) maximal activities by 32% and 20%, while cytoplasmic HSL protein content was not significantly increased. In addition, total muscle FABPpm content increased significantly (25%), while FAT/CD36 content was unaffected following training. In summary, seven sessions of HIIT over two weeks induced marked increases in whole body and skeletal muscle capacity for fatty acid oxidation during exercise in moderately active women.




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