NDLI: Time to task failure in shoulder elevation is associated to increase in amplitude and to spatial heterogeneity of upper trapezius mechanomyographic signals

Content Provider	Springer Nature Link
Author	Madeleine, Pascal Farina, Dario
Copyright Year	2007
Abstract	This study investigates the changes in mechanomyographic (MMG) topographical maps of the upper trapezius muscle during short and sustained isometric contractions until task failure. MMG signals were detected over the dominant upper trapezius muscle of 12 volunteers using an unstructured grid of 12 accelerometers. The subjects performed isometric shoulder elevation at (1) maximal voluntary contraction (100% MVC), (2) 10–20–40–60–80–100% MVC for 10 s and (3) 20% MVC until task failure. Maps of absolute and normalised average rectified value (ARV) and mean power frequency (MNF) were obtained from the two-dimensional MMG recordings. Entropy (measure of heterogeneity of maps) of the MMG ARV and MNF distributions, changes over time of ARV and MNF, and the ratio between ARV at the task failure and at 100% MVC (activation ratio) were analysed in relation to the time to task failure. For the short duration and sustained contractions, MMG ARV and MNF depended on accelerometer location (P < 0.001) while normalised values did not. The activation ratio was positively correlated with the time to task failure (R 2 = 0.36, P < 0.05). Lower ARV entropy values (P < 0.05), greater MMG ARV increase during the endurance test (P < 0.001) and higher values of ARV activation ratio (P < 0.001) were observed in the subjects with longer time to task failure. The results demonstrate an association between time to task failure and MMG activation ratio and ARV entropy, which indicates that spatial variations in MMG activity and its changes over time underlie functional mechanisms for the maintenance of force during fatiguing contractions.
Starting Page	325
Ending Page	333
Page Count	9
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	102
Issue Number	3
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-10-18
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Muscle fatigue Spatial dependency Accelerometer Topographical maps Sports Medicine Occupational Medicine/Industrial Medicine Human Physiology
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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