Electromyographic, mechanomyographic, and metabolic responses during cycle ergometry at a constant rating of perceived exertion

Kristen C Cochrane; Terry J Housh; Nathaniel D.M Jenkins; Haley C Bergstrom; Cory M Smith; Ethan C Hill; Glen O Johnson; Richard J Schmidt; Joel T Cramer

doi:10.1139/apnm-2015-0144

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Electromyographic, mechanomyographic, and metabolic responses during cycle ergometry at a constant rating of perceived exertion

Journal article

Peer reviewed

Electromyographic, mechanomyographic, and metabolic responses during cycle ergometry at a constant rating of perceived exertion

Kristen C Cochrane, Terry J Housh, Nathaniel D.M Jenkins, Haley C Bergstrom, Cory M Smith, Ethan C Hill, Glen O Johnson, Richard J Schmidt and Joel T Cramer

Applied physiology, nutrition, and metabolism, Vol.40(11), pp.1178-1185

2015

DOI: 10.1139/apnm-2015-0144

PMID: 26481288

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Abstract

Ten subjects performed four 8-min rides (65%–80% peak oxygen consumption) to determine the physical working capacity at the OMNI rating of perceived exertion (RPE) threshold (PWC OMNI ). Polynomial regression analyses were used to examine the patterns of responses for surface electromyographic (EMG) amplitude (EMG AMP), EMG mean power frequency (EMG MPF), mechanomyographic (MMG) AMP, and MMG MPF of the vastus lateralis as well as oxygen consumption rate, respiratory exchange ratio (RER), and power output (PO) were examined during a 1-h ride on a cycle ergometer at a constant RPE that corresponded to the PWC OMNI . EMG AMP and MMG MPF tracked the decreases in oxygen consumption rate, RER, and PO, while EMG MPF and MMG AMP tracked RPE. The decreases in EMG AMP and MMG MPF were likely attributable to decreases in motor unit (MU) recruitment and firing rate, while the lack of change in MMG AMP may have resulted from a balance between MU de-recruitment as PO decreased, and an increase in the ability of activated fibers to oscillate. The current findings suggested that during submaximal cycle ergometry at a constant RPE, MU de-recruitment and mechanical changes within the muscle may influence the perception of effort via feedback from group III and IV afferents.

aerobic evaluation

electromyography

exercise intensity

feedback models

intensité de l’exercice

mechanomyography

modèles de rétroaction

mécanomyographie

électromyographie

évaluation de l’effort aérobie

Details

Title: Subtitle: Electromyographic, mechanomyographic, and metabolic responses during cycle ergometry at a constant rating of perceived exertion
Creators: Kristen C Cochrane - University of Nebraska–Lincoln
Terry J Housh - University of Nebraska–Lincoln
Nathaniel D.M Jenkins - University of Nebraska–Lincoln
Haley C Bergstrom - University of Kentucky
Cory M Smith - University of Nebraska–Lincoln
Ethan C Hill - University of Nebraska–Lincoln
Glen O Johnson - University of Nebraska–Lincoln
Richard J Schmidt - University of Nebraska–Lincoln
Joel T Cramer - University of Nebraska–Lincoln
Resource Type: Journal article
Publication Details: Applied physiology, nutrition, and metabolism, Vol.40(11), pp.1178-1185
DOI: 10.1139/apnm-2015-0144
PMID: 26481288
NLM abbreviation: Appl Physiol Nutr Metab
ISSN: 1715-5312
eISSN: 1715-5320
Publisher: NRC Research Press
Language: English
Date published: 2015
Academic Unit: Center for Social Science Innovation; Injury Prevention Research Center; Health, Sport, and Human Physiology
Record Identifier: 9984259400002771

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