Evidence map›Paper›PMID 33484337›Full record

ArticleEuropean journal of applied physiology2021

Motor unit action potential amplitude during low torque fatiguing contractions versus high torque non-fatiguing contractions: a multilevel analysis.

Kylie K Harmon, Adam S Hamilton, Brent D Johnson, Frank J Bartek, Ryan M Girts, Rob J MacLennan, Debbie L Hahs-Vaughn, Matt S Stock

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Article in European journal of applied physiology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.

0numbers the graph read from it
0cells of the map it votes in
4citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

4 citing papers in PubMed.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Kylie K HarmonNeuromuscular Plasticity Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12805 Pegasus Drive, HS 1, Room 258, Orlando, FL, 32816-2205, USA.
Adam S HamiltonNeuromuscular Plasticity Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12805 Pegasus Drive, HS 1, Room 258, Orlando, FL, 32816-2205, USA.
Brent D JohnsonNeuromuscular Plasticity Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12805 Pegasus Drive, HS 1, Room 258, Orlando, FL, 32816-2205, USA.
Frank J BartekNeuromuscular Plasticity Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12805 Pegasus Drive, HS 1, Room 258, Orlando, FL, 32816-2205, USA.
Ryan M GirtsNeuromuscular Plasticity Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12805 Pegasus Drive, HS 1, Room 258, Orlando, FL, 32816-2205, USA.
Rob J MacLennanSchool of Kinesiology, Applied Health and Recreation, Oklahoma State University, Stillwater, OK, USA.
Debbie L Hahs-VaughnDepartment of Learning Sciences and Educational Research, University of Central Florida, Orlando, FL, 32816-2205, USA.
Matt S StockNeuromuscular Plasticity Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12805 Pegasus Drive, HS 1, Room 258, Orlando, FL, 32816-2205, USA. matt.stock@ucf.edu.ORCID http://orcid.org/0000-0003-1156-1084

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThe ability to maintain an absolute, submaximal torque level during fatiguing contractions is controlled, in part, by the recruitment of larger motor units. These motor units are commonly identified based on greater action potential peak-to-peak amplitude values. It is unclear, however, if motor unit action potential (MUAP) amplitude values during low torque, fatiguing contractions reach similar levels as those observed during non-fatigued, high torque contractions. To establish a clearer understanding of motor unit control during fatigue, we compared MUAP amplitude during 50 and 80% maximum voluntary contraction (MVC) torque contractions and at the beginning, middle, and end of a 30% MVC fatigue protocol.

methodsEleven untrained men (mean age = 24 years) performed isometric contractions at 50 and 80% MVC, followed by repeated contractions at 30% MVC. Surface electromyographic (EMG) signals were detected from the vastus lateralis and decomposed to quantify the peak-to-peak amplitude of individual MUAPs. A two-level multilevel model was estimated, allowing examination of simultaneous measures of MUAP amplitude within participants and controlling for the dependence between measures within participants.

resultsResults from the multilevel analyses suggested that there were not statistically significant differences in MUAP amplitude between 80% MVC and end fatigue. Separate repeated-measures analyses of variance indicated that there were not statistically significant mean differences in greatest MUAP or surface EMG amplitude between 80% MVC and end fatigue.

conclusionsMUAP and surface EMG amplitude values during a 30% MVC fatiguing protocol appear to be comparable to those observed during a non-fatigued 80% MVC condition.

Indexed as

Evoked Potentials, MotorIsometric ContractionMuscle FatigueAdultHumansMaleMuscle, SkeletalTorqueFatigueMotor unit recruitmentMotor unit sizeSurface EMG

Identifiers

PMID33484337

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.