Effects of Training Status on the Metabolic Responses to High Carbohydrate and High Fat Meals

in International Journal of Sport Nutrition and Exercise Metabolism

Click name to view affiliation

Victoria L. Bowden
Search for other papers by Victoria L. Bowden in
Current site
Google Scholar
PubMed
Close
and
Robert G. McMurray
Search for other papers by Robert G. McMurray in
Current site
Google Scholar
PubMed
Close
Restricted access

The purpose of this study was to determine if there is a difference between the way in which aerobically trained and untrained women metabolize fats and carbohydrates at rest in response to either a high-fat or high-carbohydrate meal. Subjects, 6 per group, were fed a high CHO meal (2068 kJ, 76% CHO. 23% fat, 5% protein) and a high fat meal (2093 kJ, 21% CHO, 72% fat, 8% protein) in counterbalanced order. Resting metabolic rate (RMR) was measured every half-hour for 5 hours. RMR was similar between groups. Training status had no overall effect on postprandial metabolic rate or total energy expenditure. The high fat meal resulted in no significant differences in RMR or respiratory exchange ratio (RER) between groups. However, after ingesting a high CHO meal, trained subjects had a peak in metabolism at minute 60, not evident in the untrained subjects. In addition, postprandial RER from minutes 120-300 were lower and fat use was greater after the high CHO meal for the trained subjects. These results suggest that aerobically trained women have an accelerated CHO uptake and overall lower CHO oxidation following the ingestion of a high CHO meal.

The authors are with the Dept. of Physical Education, Exercise and Sport Science, University of North Carolina at Chapel Hill. Chapel Hill, NC 27599.

  • Collapse
  • Expand
All Time Past Year Past 30 Days
Abstract Views 2003 588 112
Full Text Views 64 16 0
PDF Downloads 88 30 2