Abstract
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% V̇O2peak 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.
Original language | English |
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Pages (from-to) | 880-885 |
Number of pages | 6 |
Journal | Medicine and Science in Sports and Exercise |
Volume | 39 |
Issue number | 5 |
DOIs | |
State | Published - May 2007 |
Keywords
- Fatigue
- Glucose
- RPE
- Rest interval