Muscle- and Mode-Specific Responses of the Forearm Flexors to Fatiguing, Concentric Muscle Actions

Overview

Journal Sports (Basel)

Publisher MDPI

Specialty Public Health

Date 2018 Jun 19

PMID 29910296

Citations 6

Authors

Ethan Hill

Terry Housh

Cory Smith

Richard Schmidt

Glen Johnson

Affiliations

Soon will be listed here.

Abstract

Background: Electromyographic (EMG) and mechanomyographic (MMG) studies of fatigue have generally utilized maximal isometric or dynamic muscle actions, but sport- and work-related activities involve predominately submaximal movements. Therefore, the purpose of the present investigation was to examine the torque, EMG, and MMG responses as a result of submaximal, concentric, isokinetic, forearm flexion muscle actions.

Methods: Twelve men performed concentric peak torque (PT) and isometric PT trials before (pretest) and after (posttest) performing 50 submaximal (65% of concentric PT), concentric, isokinetic (60°·s), forearm flexion muscle actions. Surface EMG and MMG signals were simultaneously recorded from the biceps brachii and brachioradialis muscles.

Results: The results of the present study indicated similar decreases during both the concentric PT and isometric PT measurements for torque, EMG mean power frequency (MPF), and MMG MPF following the fatiguing workbout, but no changes in EMG amplitude (AMP) or MMG AMP.

Conclusions: These findings suggest that decreases in torque as a result of fatiguing, dynamic muscle actions may have been due to the effects of metabolic byproducts on excitation⁻contraction coupling as indicated by the decreases in EMG MPF and MMG MPF, but lack of changes in EMG AMP and MMG AMP from both the biceps brachii and brachioradialis muscles.

Citing Articles

Biceps Brachii and Brachioradialis Excitation in Biceps Curl Exercise: Different Handgrips, Different Synergy.

Coratella G, Tornatore G, Longo S, Toninelli N, Padovan R, Esposito F Sports (Basel). 2023; 11(3).

PMID: 36976950 PMC: 10054060. DOI: 10.3390/sports11030064.

Fatigue effect on cross-talk in mechanomyography signals of extensor and flexor forearm muscles during maximal voluntary isometric contractions.

Mohamad Ismail M, Lam C, Sundaraj K, Fazalul Rahiman M J Musculoskelet Neuronal Interact. 2021; 21(4):481-494.

PMID: 34854387 PMC: 8672403.

Elements Influencing sEMG-Based Gesture Decoding: Muscle Fatigue, Forearm Angle and Acquisition Time.

Qing Z, Lu Z, Cai Y, Wang J Sensors (Basel). 2021; 21(22).

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Electrode Size and Placement for Surface EMG Bipolar Detection from the Brachioradialis Muscle: A Scoping Review.

Merlo A, Bo M, Campanini I Sensors (Basel). 2021; 21(21).

PMID: 34770627 PMC: 8587451. DOI: 10.3390/s21217322.

Sex differences for fatigue-induced changes in muscle blood flow, but not eccentric peak torque or neuromuscular responses.

Hill E, Housh T, Keller J, Smith C, Schmidt R, Johnson G J Musculoskelet Neuronal Interact. 2018; 18(4):427-437.

PMID: 30511947 PMC: 6313047.

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