Effect of physical training on the oxidation of an oral glucose load at rest: a naturally labeled 13C-glucose study.
This study aimed at investigating, in six healthy, non obese, young (25 +/- 1 years) male volunteers, with strictly normal oral glucose tolerance, the influence of a six week physical training period (60 min bicycling 5 days/week at 30-40% of their individual VO2 max) on the hormonal and metabolic response to a 100 g oral 13C-naturally labeled glucose load given at rest before and 36 h after the last training session. Exogenous glucose oxidation was derived from 13CO2 measurements on expired air. Training resulted in: a 29% increase in VO2 max (2 p less than 0.002), a 27% decrease in plasma triglycerides (2 p less than 0.02). No changes were observed concerning weight, total body K, skinfold tolerance, which was strictly normal before training, remained unchanged, but the insulin response to the oral glucose load decreased by 24% (2 p less than 0.025). Exogenous glucose oxidation was similar before and after training, averaging 35.9 +/- 2.1 and 37.4 +/- 2.0 g/7 h respectively.


CONCLUSIONS
a 6 week training period, performed on strictly healthy young males, studied at rest, induced an increase in VO2 max, a decrease in plasma triglycerides and a lower insulin response to oral glucose while glucose tolerance and exogenous glucose oxidation remained unchanged.
D000328:Adult; D001786:Blood Glucose / Q000032:analysis; D002247:Carbon Isotopes; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005934:Glucagon / Q000097:blood; D005947:Glucose / Q000378:metabolism*; D005951:Glucose Tolerance Test; D006801:Humans; D007328:Insulin / Q000097:blood; D008055:Lipids / Q000097:blood; D008297:Male; D010084:Oxidation-Reduction; D010809:Physical Fitness
D001786:Blood Glucose; D002247:Carbon Isotopes; D005230:Fatty Acids, Nonesterified; D007328:Insulin; D008055:Lipids; D005934:Glucagon; D005947:Glucose