Faculty Collaboration Database

Acoustic myography compared to electromyography during isometric fatigue and recovery. Muscle Nerve 1993 Feb;16(2):188-92

Date

02/01/1993

Pubmed ID

8429844

DOI

10.1002/mus.880160212

Scopus ID

2-s2.0-0027472146 (requires institutional sign-in at Scopus site)   39 Citations

Abstract

This study compared the acoustic (RMS-AMG) to electromyographic (RMS-EMG) signal, median frequency of EMG power spectrum (Fm), and quadriceps torque during isometric fatiguing contraction (FC) and recovery. Seven subjects were tested for strength (MVC) and then, on separate days, maintained 20%, 40%, or 80% MVC to exhaustion followed by MVC testing at regular intervals. Throughout FC, RMS-EMG significantly (P < 0.05) increased and Fm significantly (P < 0.05) decreased during all trials; RMS-AMG significantly (P < 0.05) increased only during the 20% and 40% trials. During recovery, MVC and RMS-EMG recovered most slowly after the 20% trial and most rapidly after the 80% trial; Fm and RMS-AMG recovered by 90 seconds after all trials. RMS-AMG reflects RMS-EMG during low but not high levels of FC. Recovery of strength is most depressed following FC at lower relative levels of torque. We conclude that RMS-AMG behaves differently than RMS-EMG, torque, and Fm during FC and recovery.

Author List

Rodriquez AA, Agre JC, Knudtson ER, Franke TM, Ng AV

Author

Alexander V. Ng PhD Associate Professor in the Exercise Science department at Marquette University

MESH terms used to index this publication - Major topics in bold

Acoustics
Adult
Electromyography
Humans
Isometric Contraction
Male