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01-09-2016 | Original Article

Inter-individual variability in the patterns of responses for electromyography and mechanomyography during cycle ergometry using an RPE-clamp model

Authors: Kristen C. Cochrane-Snyman, Terry J. Housh, Cory M. Smith, Ethan C. Hill, Nathaniel D. M. Jenkins, Richard J. Schmidt, Glen O. Johnson

Published in: European Journal of Applied Physiology | Issue 9/2016

Abstract

Purpose

To examine inter-individual variability versus composite models for the patterns of responses for electromyography (EMG) and mechanomyography (MMG) versus time relationships during moderate and heavy cycle ergometry using a rating of perceived exertion (RPE) clamp model.

Methods

EMG amplitude (amplitude root-mean-square, RMS), EMG mean power frequency (MPF), MMG-RMS, and MMG-MPF were collected during two, 60-min rides at a moderate (RPE at the gas exchange threshold; RPE_GET) and heavy (RPE at 15 % above the GET; RPE_GET+15 %) intensity when RPE was held constant (clamped). Composite (mean) and individual responses for EMG and MMG parameters were compared during each 60-min ride.

Results

There was great inter-individual variability for each EMG and MMG parameters at RPE_GET and RPE_GET+15 %. Composite models showed decreases in EMG-RMS (r ² = −0.92 and R ² = 0.96), increases in EMG-MPF (R ² = 0.90), increases in MMG-RMS (r ² = 0.81 and 0.55), and either no change or a decrease (r ² = 0.34) in MMG-MPF at RPE_GET and RPE_GET+15 %, respectively.

Conclusions

The results of the present study indicated that there were differences between composite and individual patterns of responses for EMG and MMG parameters during moderate and heavy cycle ergometry at a constant RPE. Thus, composite models did not represent the unique muscle activation strategies exhibited by individual responses when cycling in the moderate and heavy intensity domains when using an RPE-clamp model.

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Title: Inter-individual variability in the patterns of responses for electromyography and mechanomyography during cycle ergometry using an RPE-clamp model
Authors: Kristen C. Cochrane-Snyman
Terry J. Housh
Cory M. Smith
Ethan C. Hill
Nathaniel D. M. Jenkins
Richard J. Schmidt
Glen O. Johnson
Publication date: 01-09-2016
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Applied Physiology / Issue 9/2016
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-016-3394-y

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Inter-individual variability in the patterns of responses for electromyography and mechanomyography during cycle ergometry using an RPE-clamp model

Abstract

Purpose

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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