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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2007 Marzo;47(1):18-24

lingua: Inglese

RPE drift during cycling in 18ºC vs 30ºC wet bulb globe temperature

Green J. M. 1, Pritchett R. C. 1, Crews T. R. 2, Tucker D. C. 2, Mclester J. R. 3, Wickwire P. J. 3

1 Department of Kinesiology The University of Alabama, Tuscaloosa, AL, USA
2 Department of Physical Education and Recreation Western Kentucky University Bowling Green, KY, USA
3 Department of Health Physical Education and Sport Science Kennesaw State University, Kennesaw, GA, USA


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Aim. The potential influence of a hotter vs cooler environment on ratings of perceived exertion (RPE) estimations during longer duration exercise is not well-understood. This study compared overall and differentiated RPEs during cycling in 18°C vs 30ºC wet bulb globe temperature (WBGT).
Methods. Male volunteers (n=16) completed a maximal cycling trial (60 rev·min-1, 25 Watts•min-1) to determine V.O2 max and ventilatory threshold (VT) before completing 2 (counterbalanced) longer duration cycling trials. At 30ºC WBGT (30C) and 18ºC WBGT (18C), subjects cycled 60 min (60 rev·min-1, 90% individualized VT). Heart rate (HR, b·min-1) and rectal temperature (Tre, ºC) were recorded every 5 min with corresponding RPE-overall (RPE-O), RPE-legs (RPE-L) and RPE-chest (RPE-C) estimations.
Results. HR was not significantly different at 5 min but was greater (P£0.05) for 30C at all other time points. During 30C, Tre was significantly greater (25, 30, 35, 40, 45, 50, 55 and 60 min), RPE-O was significantly greater (5, 40, 45, 50, 55 and 60 min), RPE-L was significantly greater (55 and 60 min) and RPE-C was significantly greater (35, 40, 45, 50, 55 and 60 min).
Conclusion. Greater cardiovascular (HR) and thermal (Tre) strain partially explain greater perceptual ratings during 30C. Discernible RPE differences resulted mid-way through 60 min cycling with minimal differences initially. Results suggest RPEs are magnified in a 30ºC (vs 18ºC) environment beyond 30 min duration. Additionally, a 30ºC environment resulted in a less pronounced impact on RPE-L (vs RPE-C and RPE-O).

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