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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
EXERCISE PHYSIOLOGY AND BIOMECHANICS
Green J. M., Crews T. R., Bosak A. M., Peveler W.
From the Department of Physical Education and Recreation Western Kentucky University, Bowling Green, KY, USA
Background. This study examined physiological responses during 0% and 10% inclined treadmill exercise at prescribed ratings of perceived exertion (RPE) using the perceptual estimation-production paradigm.
Methods. RPE’s were estimated during a Bruce treadmill test to volitional exhaustion. Subjects then produced individually prescribed RPE’s (associated with 50% and 70% V.O2max) during level (0% grade) and inclined (10% grade) treadmill exercise. Heart rate response (HR) and oxygen consumption (V.O2) were compared between estimation (EST), level production (LPR), and incline production (IPR) trials using one-way repeated measures ANOVA. Results were considered significant at p≤0.05.
Results. At 50% V.O2max, HR and V.O2 were not significantly different between EST (134±13 b·min-1, 27.1±5.6 ml·kg·min-1) and IPR (139±18 b·min-1, 30.6±11.2 ml·kg·min-1). However, HR and VO2 during LPR (123±20 b·min-1, 24.3±8.8 ml·kg·min-1) were significantly lower than IPR. For 70% V.O2max, HR and V.O2 were not significantly different between EST (168±9 b·min-1, 42.1±9.4 ml·kg·min-1) and IPR (169±14 b·min-1, 41.1±10.2 ml·kg·min-1). However HR and V.O2 during LPR (155±17 b·min-1, 35.1±8.1 ml·kg·min-1) were significantly lower than during EST and IPR.
Conclusions. Results suggest physiological responses during RPE estimation-production trials correspond better when estimation and production trials were performed at a similar treadmill incline. For exercise prescription purposes, RPE estimations made during inclined treadmill exercise may require adjustments to achieve appropriate intensities during level treadmill exercise.