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Human Performance Laboratory, Ball State University, Muncie, Indianapolis, Indiana 47306
Received 19 August 1996; accepted in final form 22 November 1996.
Starling, Raymond D., Todd A. Trappe, Allen C. Parcell, Chad
G. Kerr, William J. Fink, and David L. Costill. Effects of diet on
muscle triglyceride and endurance performance. J. Appl. Physiol. 82(4): 1185-1189, 1997.
The
purpose of this investigation was to examine the effects of diet on
muscle triglyceride and endurance performance. Seven endurance-trained
men completed a 120-min cycling bout at 65% of maximal oxygen uptake.
Each subject then ingested an isocaloric high-carbohydrate (Hi-CHO;
83% of energy) or a high-fat (Hi-Fat; 68% of energy) diet for the
ensuing 12 h. After a 12-h overnight fast, a 1,600-kJ self-paced
cycling bout was completed. Muscle triglyceride measured before (33.0 ± 2.3 vs. 37.0 ± 2.1 mmol/kg dry wt) and after (30.9 ± 2.4 vs. 32.8 ± 1.6 mmol/kg dry wt) the 120-min cycling bout was not
different between the Hi-CHO and Hi-Fat trials, respectively. After the 24-h dietary-fasting period, muscle triglyceride was significantly higher for the Hi-Fat (44.7 ± 2.4 mmol/kg dry wt) vs. the Hi-CHO (27.5 ± 2.1 mmol/kg dry wt) trial. Furthermore,
self-paced cycling time was significantly greater for the Hi-Fat (139.3 ± 7.1 min) compared with the Hi-CHO (117.1 ± 3.2 min) trial.
These data demonstrate that there was not a significant difference in
muscle triglyceride concentration before and after a prolonged
moderate-intensity cycling bout. Nevertheless, a high-fat diet
increased muscle triglyceride concentration and reduced self-paced
cycling performance 24 h after the exercise compared with a
high-carbohydrate diet.
muscle glycogen; self-paced cycling performance; serum glucose
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