Title page for ETD etd-3621142439741131

Type of Document Master's Thesis
Author Rieger, Brian W.
Author's Email Address brieger@vt.edu
URN etd-3621142439741131
Title Physiological and Metabolic Responses to Constant-Load Exercise on an Inclined Stepper and Treadmill
Degree Master of Science
Department Human Nutrition, Foods, and Exercise
Advisory Committee
Advisor Name Title
Redican, Kerry J.
Sebolt, Don R.
Davis, Shala E. Committee Chair
  • maximal exercise
  • incremental
  • stepper
Date of Defense 1997-03-25
Availability unrestricted

by Brian W. Rieger

Dr. Shala Davis, Chairman Department of Human Nutrition, Foods, and Exercise


This study evaluated oxygen uptake (VO2), heart rate (HR), and lactate [HLa] responses between the treadmill (TM) and the CardiosquatTM 1650 LETM inclined stepper by StairMasterTM (SM) during constant-load exercise. The slow component of VO2 (SC) was a central variable assessed during exercise. Twenty-two healthy college-aged (18-30) subjects completed an incremental TM and SM exercise test to establish a workload equivalent to 70% VO2peak. Following each incremental test, a 20-minute constant-load exercise bout was performed . Incremental and instant-load exercise bouts were separated by at least 48 hours. The order of the tests were randomized. VO2, HR, and [HLa] were evaluated at 5, 10, 15, and 20-minutes of exercise. Expired gases were analyzed using a Med Graphics CPX/D metabolic cart.

Blood samples were analyzed immediately for lactate concentration with an automated lactate analyzer (Yellow Springs Instrument Model 1500 Sport ). A two-way ANOVA with repeated measures was performed on the rate of change between the treadmill and stepper for VO2, HR, and [HLa]. No significant differences were found for any of the response variables (P>0.05). These results suggest at that the same relative workload, the SM does not elicit a more pronounced SC than the TM.

Based on these findings, the SM appears to be an appropriate modality of exercise for various clinical populations.

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