The purpose of this study was to test the effect of acute dairy calcium intake on exercise energy metabolism and endurance performance. Trained female runners completed two trials. Each trial consisted of a 90-min glycogen depletion run followed by a self-paced 10K time trial, conducted one hour after consumption of a high dairy (500 mg Ca+2) or low dairy (80 mg Ca+2) meal. During the 90-min run, blood samples and respiratory gases were collected. No treatment main effects of acute dairy intake were found for respiratory exchange ratio (RER), calculated fat oxidation, lactate, glycerol, or 10K time. Following this protocol, acute dairy calcium intake did not alter fat utilization or endurance performance in trained female runners.
Kimberly M. White, Roseann M. Lyle, and Michael G. Flynn are with the Department of Health and Kinesiology, Dorothy Teegarden is with the Department of Foods and Nutrition, and Shawn S. Donkin is with the Department of Animal Sciences, all at Purdue University, West Lafayette Indiana. Kimberly White is also with the Division of Health Sciences at Carroll College in Waukeshau, WI. E-mail: firstname.lastname@example.org.