AbstractsMedical & Health Science

Lipid oxidation in females during the postexercise recovery period: one vs. two bouts of exercise

by Jennifer L Barker




Institution: California State University – Chico
Department:
Year: 2015
Keywords: Lipid oxidation; Postexercise recovery; Exercise
Posted: 02/05/2017
Record ID: 2130116
Full text PDF: http://hdl.handle.net/10211.3/144682


Abstract

Research has shown that there is a difference in postexercise substrate (lipid and carbohydrate) oxidation rates and duration during one bout of exercise, most notably, an increase in lipid oxidation when compared to rest. However, it is unclear what happens to substrate oxidation rates during postexercise recovery during same-day split exercise sessions in females. The purpose of this study was to determine if total postexercise lipid oxidation in recreationally athletic females is affected by frequency of exercise (1 vs. 2 bouts) while keeping total workload the same (60 minutes at 65% VO2max). Seven recreationally athletic females were randomly allocated to each treatment and participated as their own control group. During the control trial, resting VO2, substrate oxidation (lipid and carbohydrate) rates, RER and VO2max were determined using indirect calorimetry. Subjects were then randomly allocated to each treatment, either 60 minutes of exercise at 65% VO2max on a cycle ergometer, or two 30- minute bouts at 65% VO2max on a cycle ergometer, separated by five hours. After each bout, metabolic parameters were collected every 15 minutes for three hours. A significant difference in both lipid oxidation (p < 0.0001) and carbohydrate oxidation (p < 0.005) was found between the 60-min trial postexercise recovery period and the sum of the split 30-min sessions. Significant differences in carbohydrate oxidation were found between exercise and control, and between exercise and all postexercise timepoints (p < 0.008). Although no significant differences in lipid or carbohydrate oxidation were found between the control trial and any of the postexercise timepoints of any trial, trends in increased lipid oxidation and decreased carbohydrate oxidation are seen. These results may indicate that split exercise bouts of identical workload may lead to an overall greater postexercise lipid oxidation when combined, compared to a single exercise session. Advisors/Committee Members: Azevedo, John L (advisor).