Lipid Oxidation in Females During the Postexercise Recovery Period: One Vs. Two Bouts of Exercise
Year: 2015
Type: dissertation
Study design: Clinical Trial
Abstract: Research has shown that there is a difference in postexercise substrate (lipid \nand carbohydrate) oxidation rates and duration during one bout of exercise, most notably, \nan increase in lipid oxidation when compared to rest. However, it is unclear what \nhappens to substrate oxidation rates during postexercise recovery during same-day split \nexercise sessions in females. The purpose of this study was to determine if total \npostexercise lipid oxidation in recreationally athletic females is affected by frequency of \nexercise (1 vs. 2 bouts) while keeping total workload the same (60 minutes at 65% \nVO2max). \nSeven recreationally athletic females were randomly allocated to each \ntreatment and participated as their own control group. During the control trial, resting VO2, substrate oxidation (lipid and carbohydrate) rates, RER and VO2max were \ndetermined using indirect calorimetry. Subjects were then randomly allocated to each \ntreatment, either 60 minutes of exercise at 65% VO2max on a cycle ergometer, or two 30- \nminute bouts at 65% VO2max on a cycle ergometer, separated by five hours. After each \nbout, metabolic parameters were collected every 15 minutes for three hours. A \nsignificant difference in both lipid oxidation (p < 0.0001) and carbohydrate oxidation (p \n< 0.005) was found between the 60-min trial postexercise recovery period and the sum of \nthe split 30-min sessions. Significant differences in carbohydrate oxidation were found \nbetween exercise and control, and between exercise and all postexercise timepoints (p < \n0.008). Although no significant differences in lipid or carbohydrate oxidation were found \nbetween the control trial and any of the postexercise timepoints of any trial, trends in \nincreased lipid oxidation and decreased carbohydrate oxidation are seen. These results \nmay indicate that split exercise bouts of identical workload may lead to an overall greater \npostexercise lipid oxidation when combined, compared to a single exercise session.
Author: Jennifer Lynde Barker
Language: English
Subfield: Physiology (medical)
Field: Medicine
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W2245903094