Two weeks of reduced‐volume sprint interval or traditional exercise training does not improve metabolic functioning in sedentary obese men. Issue 12 (16th July 2013)

• Record Type: Journal Article
• Authors: Skleryk, J. R.; Karagounis, L. G.; Hawley, J. A.; Sharman, M. J.; Laursen, P. B.; Watson, G.
• Is Part Of: Diabetes, obesity & metabolism. Volume 15:Issue 12(2013:Dec.)
• Page Start: 1146
• Page End: 1153
• Publication Date: 2013-07-16
• Subjects: exercise -- glucose uptake -- obesity -- skeletal muscle; Diabetes -- Periodicals; Obesity -- Periodicals; Metabolism -- Disorders -- Periodicals; Clinical pharmacology -- Periodicals; 616.462
• DOI: 10.1111/dom.12150
• Languages: English
• ISSNs: 1462-8902

Abstract

Abstract : Aims: To investigate the effects of short‐term, reduced‐volume sprint interval training (SIT) compared to traditional exercise recommendations (TER) in sedentary obese men. Methods: Sixteen subjects [37.8 ± 5.8 years; body mass index (BMI) 32.8 ± 4.7 kg/m 2 ] were randomly allocated to 2 weeks of either SIT (6 sessions of 8–12 × 10 s sprints) or TER [10 sessions of 30 min at 65% peak oxygen consumption (VO2peak )] cycle exercise. Fasting plasma glucose, insulin, non‐esterified fatty acids (NEFA), homeostasis model assessment of insulin sensitivity (HOMA–IR), body composition and VO2peak were assessed at baseline and approximately 72 h after the final training bout. Skeletal muscle biopsy samples were also obtained before and 72 h after training and analysed for AS160 phosphorylation and COX II, COX IV, GLUT‐4, Nur77 and SIRT1 protein expression. Results: No changes in BMI, body composition, VO2peak, glucose, insulin, NEFA and HOMA–IR were observed after training, either within or between groups. Skeletal muscle markers of glucose metabolism and mitochondrial function also remained unaltered after 2 weeks of exercise training. Conclusions: Our findings show that 2 weeks of reduced‐volume SIT or TER did not elicit any measurable metabolic adaptations in sedentary obese men. Further work is needed to determine the minimal amount of exercise required for short‐term adaptations in this population.