Effect of carbohydrate ingestion subsequent to carbohydrate supercompensation on endurance performance.
This investigation determined whether carbohydrate ingestion during prolonged moderate-intensity exercise enhanced endurance performance when the exercise was preceded by carbohydrate supercompensation. Seven male trained cyclists performed two trials at an initial power output corresponding to 71 +/- 1% of their peak oxygen consumption. During the trials, subjects ingested either a 6% glucose/sucrose (C) solution or an equal volume of artificially flavored and sweetened placebo (P) every 20 min throughout exercise. Both C and P were preceded by a 6-day carbohydrate supercompensation procedure in which subjects undertook a depletion-taper exercise sequence in conjunction with a moderate- and high-carbohydrate diet regimen. Statistical analysis of time to exhaustion, plasma glucose concentration, carbohydrate oxidation rate, fat oxidation rate, and plasma glycerol concentration indicated that in spite of a carbohydrate supercompensation procedure administered prior to exercise, carbohydrate ingestion during exercise can exert an additional ergogenic effect by preventing a decline in blood glucose levels and maintaining carbohydrate oxidation during the later stages of moderate-intensity exercise.
Kang
J
J
Department of Health and Exercise Sciences, Rowan College of New Jersey, Glassboro 08028, USA.
Robertson
R J
RJ
Denys
B G
BG
DaSilva
S G
SG
Visich
P
P
Suminski
R R
RR
Utter
A C
AC
Goss
F L
FL
Metz
K F
KF
D000328:Adult; D001642:Bicycling; D001786:Blood Glucose / Q000378:metabolism; D050260:Carbohydrate Metabolism; D004040:Dietary Carbohydrates / Q000008:administration & dosage*; D015444:Exercise / Q000502:physiology; D005990:Glycerol / Q000097:blood; D006801:Humans; D007700:Kinetics; D008297:Male; D010084:Oxidation-Reduction; D010101:Oxygen Consumption; D010807:Physical Endurance / Q000502:physiology*
D001786:Blood Glucose; D004040:Dietary Carbohydrates; D005990:Glycerol