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Low carbohydrate diet affects the oxygen uptake on‐kinetics and rating of perceived exertion in high intensity exercise
Author(s) -
LimaSilva Adriano E.,
Pires FláVio O.,
Bertuzzi Rômulo C. M.,
Lira Fábio S.,
Casarini Dulce,
Kiss Maria Augusta P. D. M.
Publication year - 2011
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.2010.01059.x
Subject(s) - cardiorespiratory fitness , rating of perceived exertion , heart rate , medicine , chemistry , carbohydrate , endocrinology , perceived exertion , intensity (physics) , exercise intensity , psychology , zoology , blood pressure , biology , physics , quantum mechanics
The aim of this study was to determine if the carbohydrate (CHO) availability alters the rate of increase in the rating of perceived exertion (RPE) during high intensity exercise and whether this would be associated with physiological changes. Six males performed high intensity exercise after 48 h of controlled, high CHO (80%) and low CHO (10%) diets. Time to exhaustion was lower in the low compared to high CHO diet. The rate of increase in RPE was greater and the VO 2 slow component was lower in the low CHO diet than in the control. There was no significant condition effect for cortisol, insulin, pH, plasma glucose, potassium, or lactate concentrations. Multiple linear regression indicated that the total amplitude of VO 2 and perceived muscle strain accounted for the greatest variance in the rate of increase in RPE. These results suggest that cardiorespiratory variables and muscle strain are important afferent signals from the periphery for the RPE calculations.