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The Effect of Liquid Carbohydrate Ingestion on Repeated Maximal Effort Exercise in Competitive Cyclists

HAUB, MARK D.1; Haff, G. Gregory2; POTTEIGER, JEFFREY A.3

The Journal of Strength & Conditioning Research: February 2003 - Volume 17 - Issue 1 - p 20–25
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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 (100KJ-TEST). The subjects performed a first 100KJ-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 100KJ-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.

1Department of Human Nutrition, Kansas State University, Manhattan, Kansas 66506

2Department of Health, Leisure, and Exercise Science, Appalachian State University, Boone, North Carolina 28608

3Department of Health, Physical Education, and Recreation, Virginia Commonwealth University, Richmond, Virginia 23284.

© 2003 National Strength and Conditioning Association