תזונה ותוספים Low carbohydrate diet affects the oxygen uptake on-kinetics and rating of perceived e

[Mike Bikov]

Psychophysiology. 2010 Jul 6. [Epub ahead of print]
Low carbohydrate diet affects the oxygen uptake on-kinetics and rating of perceived exertion in high intensity exercise.

Lima-Silva AE, Pires FO, Bertuzzi RC, Lira FS, Casarini D, Kiss MA.

School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.
Abstract

Abstract 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.​

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