title: Physiological responses at 0% and 10% treadmill incline using the RPE estimation-production paradigm.
abstract: 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% VO2max) during level (0% grade) and inclined (10% grade) treadmill exercise. Heart rate response (HR) and oxygen consumption (VO2) were compared between estimation (EST), level production (LPR), and incline production (IPR) trials using one-way repeated measures ANOVA. Results were considered significant at < or = 0.05.
  
  
  RESULTS
  At 50% VO2max, HR and VO2 were not significantly different between EST (134 +/- 13 b x min-1, 27.1 +/- 5.6 ml x kg x min-1) and IPR (139 +/- 18 b x min-1, 30.6 +/- 11.2 ml x kg x min-1). However, HR and VO2 during LPR (123 +/- 20 b x min-1, 24.3 +/- 8.8 ml x kg x min-1) were significantly lower than IPR. For 70% VO2max, HR and VO2 were not significantly different between EST (168 +/- 9 b x min-1, 42.1 +/- 9.4 ml x kg x min-1) and IPR (169 +/- 14 b x min-1, 41.1 +/- 10.2 ml x kg x min-1). However HR and VO2 during LPR (155 +/- 17 b x min-1, 35.1 +/- 8.1 ml x kg x 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.
authors.affiliation: Department of Physical Education and Recreation, Western Kentucky University, Bowling Green, KY 42101, USA. matt.green@wku.edu
authors.forename: J M
authors.initials: JM
authors.lastname: Green
authors.forename: T R
authors.initials: TR
authors.lastname: Crews
authors.forename: A M
authors.initials: AM
authors.lastname: Bosak
authors.forename: W
authors.initials: W
authors.lastname: Peveler
mesh_terms: D000328:Adult; D002985:Clinical Protocols; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology*; D013223:Statistics as Topic