Flávio Pires is grateful to CAPES (Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior) for his scholarships (PDEE BEX 1900/08-0) and FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo) for the financial support to this study (Process 2006/60641-6). Timothy Noakes and Mike Lambert are supported by the Discovery Health, the Medical Research Council, and the University of Cape Town.
The influence of peripheral afferent signals on the rating of perceived exertion and time to exhaustion during exercise at different intensities
Version of Record online: 4 MAR 2011
Copyright © 2011 Society for Psychophysiological Research
Volume 48, Issue 9, pages 1284–1290, September 2011
How to Cite
Pires, F. O., Lima-Silva, A. E., Bertuzzi, R., Casarini, D. H., Kiss, M. A. P. D. M., Lambert, M. I. and Noakes, T. D. (2011), The influence of peripheral afferent signals on the rating of perceived exertion and time to exhaustion during exercise at different intensities. Psychophysiology, 48: 1284–1290. doi: 10.1111/j.1469-8986.2011.01187.x
The authors acknowledge the presence of a different manuscript (Pires et al., 2011, British Journal of Sports Medicine, In Press, published online, April 4, 2011; DOI: 10.1136/bjsm.2010.079087) which utilized the same data to respond to a different objective.
- Issue online: 27 JUL 2011
- Version of Record online: 4 MAR 2011
- (Received July 1, 2010; Accepted January 6, 2011)
- Multiple linear regressive model;
- Brain activity;
- Central nervous system;
- Afferent feedback
This study determined which peripheral variables would better predict the rating of perceived exertion (RPE) and time to exhaustion (TE) during exercise at different intensities. Ten men performed exercises at first lactate threshold (LT1), second lactate threshold (LT2), 50% of the distance from LT1 to LT2 (TT50%), and 25% of the distance from LT2 to maximal power output (TW25%). Lactate, catecholamines, potassium, pH, glucose, V̇O2, VE, HR, respiratory rate (RR) and RPE were measured and plotted against the exercise duration for the slope calculation. Glucose, dopamine, and noradrenaline predicted RPE in TT50% (88%), LT2 (64%), and TW25% (77%), but no variable predicted RPE in LT1. RPE (55%), RPE+HR (86%), and RPE+RR (92% and 55%) predicted TE in LT1, TT50%, LT2, and TW25%, respectively. At intensities from TT50% to TW25%, variables associated with brain activity seem to explain most of the RPE slope, and RPE (+HR and+RR) seems to predict the TE.