Time course of changes in neuromuscular responses during rides to exhaustion above and below critical power

Taylor K. Dinyer; M. Travis Byrd; Kristen C. Cochrane-Snyman; Nathaniel D M Jenkins; Terry J. Housh; Richard J. Schmidt; Glen O. Johnson; Haley C. Bergstrom

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Time course of changes in neuromuscular responses during rides to exhaustion above and below critical power

Journal article

Open access

Peer reviewed

Time course of changes in neuromuscular responses during rides to exhaustion above and below critical power

Taylor K. Dinyer, M. Travis Byrd, Kristen C. Cochrane-Snyman, Nathaniel D M Jenkins, Terry J. Housh, Richard J. Schmidt, Glen O. Johnson and Haley C. Bergstrom

Journal of musculoskeletal & neuronal interactions, Vol.19(3), pp.266-275

09/01/2019

PMCID: PMC6737559

PMID: 31475933

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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6737559/View

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Abstract

Objectives: To examine the time course of changes in electromyographic (EMG) and mechanomyographic (MMG) amplitude (AMP) and mean power frequency (MPF) responses during cycle ergometry to exhaustion performed above (CP+10%) and below (CP-10%) critical power (CP) to infer motor unit activation strategies used to maintain power output. Methods: Participants performed a 3-min all out test to determine CP, and 2 randomly ordered, continuous rides to exhaustion at CP+10% and CP-10%. (V) over dot O-2, EMG AMP, EMG MPF, MMG AMP, MMG MPF, and time to exhaustion (T-lim) were recorded. Responses at CP-10% and CP+10% were analyzed separately. Results: At CP-10%, EMG and MMG AMP were significantly greater than the initial 5% timepoint at 100% T-lim. EMG MPF and MMG MPF reflected a downward trend that resulted in no significant difference between timepoints. At CP+10%, EMG AMP was significantly greater than the initial 5% timepoint from 60% to 100% T-lim. MMG AMP was less than the initial 5% timepoint at only 50% T-lim. EMG and MMG MPF were significantly less than the initial 5% timepoint at 20% T-lim and 100% T-lim, respectively. Conclusions: The time-course of changes in EMG and MMG signals were different at CP-10% and CP+10%, but responses observed indicated cycle ergometry to exhaustion relies on similar motor unit activation strategies.

Physiology

Life Sciences & Biomedicine

Neurosciences

Neurosciences & Neurology

Science & Technology

Details

Title: Subtitle: Time course of changes in neuromuscular responses during rides to exhaustion above and below critical power
Creators: Taylor K. Dinyer - Univ Kentucky, Dept Kinesiol & Hlth Promot, Lexington, KY 40502 USA
M. Travis Byrd - Univ Kentucky, Dept Kinesiol & Hlth Promot, Lexington, KY 40502 USA
Kristen C. Cochrane-Snyman - Concordia University Chicago
Nathaniel D M Jenkins - Oklahoma State University
Terry J. Housh - University of Nebraska–Lincoln
Richard J. Schmidt - University of Nebraska–Lincoln
Glen O. Johnson - University of Nebraska–Lincoln
Haley C. Bergstrom - University of Kentucky
Resource Type: Journal article
Publication Details: Journal of musculoskeletal & neuronal interactions, Vol.19(3), pp.266-275
PMID: 31475933
PMCID: PMC6737559
NLM abbreviation: J Musculoskelet Neuronal Interact
ISSN: 1108-7161
Publisher: Jmni
Number of pages: 10
Language: English
Date published: 09/01/2019
Academic Unit: Center for Social Science Innovation; Injury Prevention Research Center; Health, Sport, and Human Physiology
Record Identifier: 9984258345202771

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