Fatigue Research Today is a free monthly online journal that collates and summarizes the latest research about Fatigue, including details on chronic fatigue syndrome, exhaustion, causes, diagnosis.

Carbohydrate attenuates perceived exertion during intermittent exercise and recovery.

Utter AC, Kang J, Nieman DC, Dumke CL, McAnulty SR, McAnulty LS

Departments of Health, Leisure, and Exercise Science, Appalachian State University, Boone, NC 28608, USA. utterac@appstate.edu

PURPOSE: The purpose of this study was to examine the effect of carbohydrate supplementation on differentiated and undifferentiated ratings of perceived exertion (RPE) during prolonged intermittent exercise and recovery. METHODS: Twelve male subjects cycled for 2.0 h at 64% Wmax and 73% V O2peak with 3-min rest intervals interspersed every 10 min (2.6 h of total exercise time, including rest intervals) with placebo (P) or carbohydrate (C) beverages. RPE was assessed during the last minute of each 10-min exercise interval and then every 30 s during the 3-min recovery period. RESULTS: The pattern of change in RPE over time was significantly different between C and P ingestion (P < 0.05), with attenuated RPE responses found for both overall body (O) and legs (L). A significant main effect was found for recovery RPE-O between C and P ingestion (P < 0.05), with attenuated RPE responses found in the later part of the 2-h run. C relative to P ingestion was associated with higher respiratory exchange ratios and plasma levels of glucose and with lower levels of plasma cortisol. CONCLUSIONS: These data indicate that carbohydrate supplementation attenuates perceived exertion during prolonged intermittent exercise and recovery.

Published 30 April 2007 in Med Sci Sports Exerc, 39(5): 880-5.
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