Proceedings of The Physiological Society

Europhysiology 2018 (London, UK) (2018) Proc Physiol Soc 41, PCA162

Poster Communications

The effect of high intensity interval training (HIIT) without dietary intervention on glucose regulation in sedentary aging men and masters athletes.

L. D. Hayes1, P. Herbert2, N. Sculthorpe3, F. Grace4

1. University of Cumbria, Lancaster, England, United Kingdom. 2. University of Wales, Carmathen, United Kingdom. 3. University of the West of Scotland, Hamilton, United Kingdom. 4. Federation University, Ballarat, Victoria, Australia.

The aim of the present investigation was to establish whether masters athletes (LEX) exhibited improved glucose regulation (fasting glucose, fasting insulin, and the homeostatic model assessment of insulin resistance and insulin sensitivity [HOMA-IR and HOMA-IS respectively]) compared to sedentary older males (SED). A secondary aim was to investigate whether 6 weeks' high intensity interval training (HIIT; 6 x 30 s sprints at 40% peak power, once every five days) preceded by 6 weeks' aerobic preconditioning would affect glucose regulation. Twenty-two males (62 ± 2 years) comprised the SED group and 17 males (60 ± 5 years) were enrolled as LEX. Insulin, HOMA-IR, and HOMA-IS were lower in LEX than SED (P<0.05). HIIT did not alter glucose, insulin, HOMA-IR, or HOMA-IS in LEX (P>0.05). HIIT reduced SED glucose compared to baseline (P=0.013, Cohen's d=0.36) and compared to post-preconditioning (P=0.009, Cohen's d=0.35). HIIT reduced HOMA-IR in SED compared to baseline (P=0.027, Cohen's d=0.25), and compared to after preconditioning (P=0.069, Cohen's d=0.36). Results of this study indicate that HIIT preceded by preconditioning without dietary intervention improve glucose regulation in SED, as evidenced by reduced fasting glucose and HOMA-IR.

Where applicable, experiments conform with Society ethical requirements