Substrate utilization during endurance exercise in men and women after endurance training

1  Rehabilitation and 2  Neurology, Department of Medicine, McMaster University, Hamilton, Ontario, Canada L8N 3Z5 We investigated the effect of endurance training on whole body substrate, glucose, and glycerol utilization during 90 min of exercise at 60% peak O 2 consumption ( O 2 peak ) in males a...

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Published in:American journal of physiology: endocrinology and metabolism 2001-06, Vol.280 (6), p.E898-E907
Main Authors: Carter, S. L, Rennie, C, Tarnopolsky, M. A
Format: Article
Language:English
Subjects:
Adaptation, Physiological - physiology
Adult
Blood Glucose
Dietary Carbohydrates - pharmacokinetics
Dietary Fats - pharmacokinetics
Epinephrine - blood
Female
Glucose - pharmacokinetics
Glycerol - metabolism
Humans
Lactic Acid - blood
Longitudinal Studies
Male
Norepinephrine - blood
Oxidation-Reduction
Oxygen Consumption - physiology
Physical Endurance - physiology
Sex Characteristics
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Summary:1  Rehabilitation and 2  Neurology, Department of Medicine, McMaster University, Hamilton, Ontario, Canada L8N 3Z5 We investigated the effect of endurance training on whole body substrate, glucose, and glycerol utilization during 90 min of exercise at 60% peak O 2 consumption ( O 2 peak ) in males and females. Substrate oxidation was determined before and after 7 wk of endurance training on a cycle ergometer, with posttesting performed at the same absolute (ABS, W) and relative (REL, % O 2 peak ) intensities. [6,6- 2 H]glucose and [1,1,2,3,3- 2 H]glycerol tracers were used to calculate the respective substrate tracee flux. Endurance training resulted in an increase in O 2 peak for both males and females of 17 and 22%, respectively ( P  
ISSN:0193-1849
1522-1555
DOI:10.1152/ajpendo.2001.280.6.e898