|Appears in Collections:||Faculty of Health Sciences and Sport Journal Articles|
|Peer Review Status:||Refereed|
|Title:||Two weeks of high-intensity aerobic interval training increases the capacity for fat oxidation during exercise in women|
|Authors:||Talanian, Jason L|
Galloway, S D
Heigenhauser, George J F
Spriet, Lawrence L
fatty acid transport
|Citation:||Talanian JL, Galloway SD, Heigenhauser GJF, Bonen A & Spriet LL (2007) Two weeks of high-intensity aerobic interval training increases the capacity for fat oxidation during exercise in women, Journal of Applied Physiology, 102 (4), pp. 1439-1447.|
|Abstract:||The present study examined the effects of seven high intensity, intermittent training (HIIT) sessions on skeletal muscle fuel contents, mitochondrial enzyme activities, whole muscle fatty acid transport proteins, whole body VO2peak, and whole body metabolic, hormonal and cardiovascular responses to submaximal exercise. Eight females participated in the study (22.1 ± 0.2 yrs, 65.0 ± 0.8 kg, VO2peak: 2.36 ± 0.17 lmin-1). Subjects performed a VO2peak test and a 60 min cycling trial at ~60% VO2peak prior to and following training. HIIT consisted of 7 sessions in total performed every other day over a two week period. Each HIIT session consisted of ten 4 min bouts at ~90% VO2peak with 2 min of rest between bouts. VO2peak increased (p < 0.05) 13% following training. Following HIIT, plasma epinephrine and lactate concentrations, heart rate, RER and whole body fat oxidation (PRE: 15.0 2.4, POST: 20.4 2.5 ghr-1) were lower during the final 30 min of the 60 min cycling trial at ~60% pre-training VO2peak. Resting muscle glycogen and triacylglcyerol contents were unaffected by HIIT, but net glycogen use was reduced during the 60 min cycling trial. HIIT significantly increased muscle β-HAD (PRE: 15.44 1.57, POST: 20.35 1.40 mmolmin-1kg ww) and citrate synthase (PRE: 24.45 1.89, POST: 29.31 1.64 mmolmin-1kg ww) maximal activities, while cytoplasmic HSL protein content was not significantly increased. In addition, total muscle FABPpm content increased significantly (25%), while FAT/CD36 content was unaffected by training. In summary, only seven sessions of HIIT over 2 weeks induced marked increases in the whole body and skeletal muscle capacity for fat oxidation during exercise in moderately active women. The increase in muscle fat oxidation after training may involve greater fatty acid uptake at the muscle and mitochondrial membranes as a result of increases in fatty acid transport (FABPpm) content.|
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