Premium
Two weeks of reduced‐volume sprint interval or traditional exercise training does not improve metabolic functioning in sedentary obese men
Author(s) -
Skleryk J. R.,
Karagounis L. G.,
Hawley J. A.,
Sharman M. J.,
Laursen P. B.,
Watson G.
Publication year - 2013
Publication title -
diabetes, obesity and metabolism
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.445
H-Index - 128
eISSN - 1463-1326
pISSN - 1462-8902
DOI - 10.1111/dom.12150
Subject(s) - sprint , medicine , endocrinology , interval training , nefa , skeletal muscle , high intensity interval training , vo2 max , insulin , glucose homeostasis , insulin resistance , physical therapy , heart rate , blood pressure
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 ( VO 2peak )] cycle exercise. Fasting plasma glucose, insulin, non‐esterified fatty acids ( NEFA ), homeostasis model assessment of insulin sensitivity ( HOMA–IR ), body composition and VO 2peak 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, VO 2peak , 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.