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Sports 2015, 3(4), 369-382; doi:10.3390/sports3040369

Physiological Responses Underlying the Perception of Effort during Moderate and Heavy Intensity Cycle Ergometry

Department of Nutrition and Health Sciences, 211 Ruth Leverton Hall, University of Nebraska-Lincoln, Lincoln, NE 68583, USA
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Author to whom correspondence should be addressed.
Academic Editor: Eling Douwe de Bruin
Received: 1 November 2015 / Revised: 3 December 2015 / Accepted: 7 December 2015 / Published: 14 December 2015
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Abstract

This study examined patterns of responses for physiological and perceptual variables during cycle ergometry at a constant rate of perceived exertion (RPE) within the moderate and heavy exercise intensity domains. Nineteen (mean age 21.3 ± 0.5 years; 43.4 ± 2.0 mL·kg−1·min−1 V ˙ O 2 Peak ) moderately trained cyclists performed an incremental test to exhaustion and two 60 min constant RPE rides at the RPE corresponding to the gas exchange threshold (RPEGET) and 15% above the GET (RPEGET+15%). Oxygen consumption ( V ˙ O2), respiratory exchange ratio (RER), heart rate (HR), minute ventilation ( V ˙ E ), breathing frequency ( ℱ b ), and power output (PO) were monitored throughout the rides. Polynomial regression analyses showed V ˙ O2, RER, HR, and V ˙ E (correlation = −0.85 to −0.98) tracked the decreases in PO required to maintain a constant RPE. Only ℱ b tracked RPE during the moderate and heavy intensity rides. Repeated measures ANOVAs indicated that V ˙ O2 during the 60 min rides at RPEGET was not different (p > 0.05) from V ˙ O2 at GET from the incremental test to exhaustion. Thus, monitoring intensity using an RPE associated with the GET is sustainable for up to 60 min of cycling exercise and a common mechanism may mediate ℱ b and the perception of effort during moderate and heavy intensity cycle ergometry. View Full-Text
Keywords: gas exchange threshold; perception; respiration; exercise intensity gas exchange threshold; perception; respiration; exercise intensity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cochrane, K.C.; Housh, T.J.; Hill, E.C.; Smith, C.M.; Jenkins, N.D.; Cramer, J.T.; Johnson, G.O.; Schmidt, R.J. Physiological Responses Underlying the Perception of Effort during Moderate and Heavy Intensity Cycle Ergometry. Sports 2015, 3, 369-382.

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