Michael Braun1-2, Bryant Stamford1. Acute Effect of Sprint Interval Cycling vs. Continuous Moderate Intensity Cycling on Postprandial Insulin Sensitivity. 1Kinesiology and Integrative Physiology Program, Hanover College, Hanover, IN, USA. 2High Altitude Exercise Physiology Program, Western Colorado University, Gunnison, CO, USA.
Abstract
Aim: The purpose of this study was to examine the effect of exercise intensity on postprandial glucose uptake. Methods: In a crossover experimental design, eight college aged male athletes completed separate bouts of continuous moderate-intensity (CMIE) exercise on the cycle ergometer and maximum effort sprint repeats of the Wingate test (SIE), each followed by an oral glucose tolerance test (OGTT). Glucose area under the curve (AUC) served as a proxy for acute postprandial insulin sensitivity. Total work output was kept constant between the CMIE and SIE sessions Results: Compared to control, both intensities were able to significantly reduce AUC, ΔAUC, and glucose concentrations at several time points during the OGTT. No statistically significant difference, aside from ΔBG at the 15- minute mark, was found between the two exercise conditions. Conclusions: Both CMIE and SIE improve acute postprandial insulin sensitivity in healthy young males.