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Int J Sports Med 2015; 36(06): 466-473
DOI: 10.1055/s-0034-1396826
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Physiological Responses during Cycle Ergometry at a Constant Perception of Effort

K. C. Cochrane
1   Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States
,
T. J. Housh
1   Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States
,
H. C. Bergstrom
1   Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States
,
N. D. M. Jenkins
1   Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States
,
G. Johnson
1   Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States
,
R. J. Schmidt
1   Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States
,
J. T. Cramer
1   Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, United States
› Author Affiliations
Further Information

Publication History



accepted after revision 07 October 2014

Publication Date:
20 February 2015 (online)

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Abstract

13 subjects performed an incremental test to exhaustion, 4, 8-min submaximal rides, and a 1-h ride at the rating of perceived exertion (RPE) that corresponded to the physical working capacity at the OMNI threshold (PWCOMNI) to examine: 1) the oxygen consumption (V̇O2), heart rate (HR), minute ventilation (+V̇ E ), respiratory frequency (FR), and power output responses during 1-h work bouts at a constant RPE that corresponded to the PWCOMNI; and 2) the ability of current models to explain the responses for physiological and perceptual parameters during the 1-h work bouts. The RPE that corresponded to the PWCOMNI represented a sustainable exercise intensity (56±5% (V̇O2Peak ) within the moderate-intensity domain. The mean, normalized slope coefficients for the V̇O2, +V̇ E , and power output vs. time relationships during the 1-h rides were significantly less than zero. The mean, normalized slope coefficient for the FR vs. time relationship during the 1-h rides, however, was not significantly different from zero. Thus, RPE most clearly tracked FR responses during the 1-h rides. It was hypothesized that afferent feedback from respiratory muscles may have mediated the perception of effort during cycle ergometry at a constant RPE in the moderate-intensity domain.

Key words

exercise intensity - power output - feedback models - aerobic evulation - RPE
 

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