Effects of training status on the metabolic responses to high carbohydrate and high fat meals.
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. 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.
Bowden
V L
VL
Department of Physical Education, Exercise and Sport Science, University of North Carolina, Chapel Hill 27599, USA.
McMurray
R G
RG
D000328:Adult; D000704:Analysis of Variance; D001481:Basal Metabolism / Q000502:physiology; D001827:Body Height; D001835:Body Weight; D004040:Dietary Carbohydrates / Q000008:administration & dosage / Q000378:metabolism* / Q000493:pharmacokinetics; D004041:Dietary Fats / Q000008:administration & dosage / Q000378:metabolism*; D004044:Dietary Proteins / Q000008:administration & dosage; D004063:Digestion / Q000502:physiology; D004734:Energy Metabolism / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008875:Middle Aged; D010084:Oxidation-Reduction; D010101:Oxygen Consumption / Q000502:physiology; D010809:Physical Fitness / Q000502:physiology*; D011659:Pulmonary Gas Exchange / Q000502:physiology; D012885:Skinfold Thickness; D013147:Spirometry
D004040:Dietary Carbohydrates; D004041:Dietary Fats; D004044:Dietary Proteins