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Medicine & Science in Sports & Exercise:
doi: 10.1249/mss.0b013e31803174a8
APPLIED SCIENCES: Psychobiology and Behavioral Strategies

Carbohydrate Attenuates Perceived Exertion during Intermittent Exercise and Recovery

UTTER, ALAN C.1; KANG, JIE3; NIEMAN, DAVID C.1; DUMKE, CHARLES L.1; McANULTY, STEVEN R.1; McANULTY, LISA S.2

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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% 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.

©2007The American College of Sports Medicine

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