NDLI: Electromyogram features during linear torque decrement and their changes with fatigue

Content Provider	Springer Nature Link
Author	Andrzejewska, Renata Jaskólski, Artur Jaskólska, Anna Gobbo, Massimilia Orizio, Claudio
Copyright Year	2014
Abstract	Surface electromyogram (EMG) spike shape analysis (SSA) has recently been proposed as an adjunct tool to EMG time and frequency domain analysis to increase our knowledge of motor unit (MU) control strategies. The study was aimed to understand more in MU deactivation strategy during torque decrement, and its possible changes in fatigued muscle, using a combination of traditional time and frequency domain analysis and SSA techniques.EMG was detected from the biceps brachii of 11 untrained male subjects during static down-going ramp contractions (90–0 % of the maximal voluntary contraction, MVC) under non-fatigued (DGR) and fatigued (FDGR) conditions. The root mean square (RMS) and mean frequency (MF), as well as SSA parameters, were calculated on 1-s EMG windows centred on each 10 % MVC step for both conditions.In both the DGR and FDGR EMG-RMS, mean spike amplitude and mean spike slope decreased by 50 % in the 90–60 % MVC. The mean spike frequency also decreased by 50 % in the 30–10 % MVC. Except the “mean number of spikes per second” all the other estimated EMG parameters were significantly different during FDGR compared to DGR.The dynamics of EMG parameters during torque decrement would support a MU deactivation strategy which relies more on MU de-recruitment in the high % MVC range and more on firing rate reduction in the low % MVC range. The adopted integrated approach to EMG signal processing could indicate that SSA is an important tool to disclose alterations in motor control due to fatigue.
Starting Page	2105
Ending Page	2117
Page Count	13
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	114
Issue Number	10
e-ISSN	14396327
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-06-24
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Motor control Motor units Muscle fatigue Time and frequency domain analysis Spike shape analysis Human Physiology Occupational Medicine/Industrial Medicine Sports Medicine
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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