The effect of liquid carbohydrate ingestion on repeated maximal effort exercise in competitive cyclists.
We investigated the effects of carbohydrate ingestion during recovery from high-intensity exercise on subsequent high-intensity exercise in trained cyclists. Aerobic power was determined, and the competitive cyclists (N = 7) were familiarized with the 100-kJ test protocol (100 KJ-TEST). The subjects performed a first 100 KJ-TEST (RIDE-1), ingested 0.7 g.(kg body mass)(-1) of Gatorlode (CHO) or placebo (PLC), rested for 60 minutes, and then performed a second 100 KJ-TEST (RIDE-2). Blood samples taken before (PRE-1) and after (POST-1) RIDE-1 and before (PRE-2) and after (POST-2) RIDE-2 were analyzed for plasma glucose ([glucose]), lactate, and nonesterified fatty acids ([NEFA]). No significant differences (p > 0.05) were observed between treatments in time to complete RIDE-1 (CHO = 270.3 +/- 29.0 seconds; PLC = 269.9 +/- 33.0 seconds) and RIDE-2 (CHO = 271.7 +/- 26.6 seconds; PLC = 275.3 +/- 30.6 seconds). Plasma [glucose] significantly decreased during the 60-minute recovery for PLC. There was an interaction effect for [NEFA] during recovery, with [NEFA] increasing for PLC and decreasing for CHO. Carbohydrate ingestion after maximal exercise does not appear to influence subsequent short-duration maximal effort exercise in competitive cyclists but does alter plasma [glucose] and [NEFA] relative to a PLC condition.
Haub
Mark D
MD
Department of Human Nutrition, Kansas State University, Manhattan, Kansas 66506, USA. haub@humec.ksu.edu
Haff
G Gregory
GG
Potteiger
Jeffrey A
JA
D000328:Adult; D001628:Beverages; D001642:Bicycling / Q000502:physiology*; D001786:Blood Glucose / Q000032:analysis; D004040:Dietary Carbohydrates / Q000008:administration & dosage*; D004311:Double-Blind Method; D002149:Energy Intake; D005230:Fatty Acids, Nonesterified / Q000097:blood; D006801:Humans; D007552:Isotonic Solutions / Q000008:administration & dosage; D019344:Lactic Acid / Q000097:blood; D008297:Male; D008320:Maltose / Q000008:administration & dosage; D010101:Oxygen Consumption; D010807:Physical Endurance / Q000502:physiology*; D011134:Polysaccharides / Q000008:administration & dosage
D001786:Blood Glucose; D004040:Dietary Carbohydrates; D005230:Fatty Acids, Nonesterified; D007552:Isotonic Solutions; D011134:Polysaccharides; C011259:gatorade; D019344:Lactic Acid; D008320:Maltose; C008315:maltodextrin