NDLI: Isometric fatigue patterns in time and time-frequency domains of triceps surae muscle in different knee positions.

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Isometric fatigue patterns in time and time-frequency domains of triceps surae muscle in different knee positions.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Pereira, Glauber Ribeiro de Oliveira, Liliam Fernandes Nadal, Jurandir
Description	Country affiliation: Brazil Author Affiliation: Pereira GR ( Biomedical Engineering Program-COPPE, Federal University of Rio de Janeiro, P.O. Box 68510, 21941-972 Rio de Janeiro, RJ, Brazil.)
Abstract	The occurrence of fatigue in triceps surae (TS) muscles during sustained plantar flexion contraction is investigated by means of the RMS electromyogram (EMG) and the instantaneous median frequency (IMF) of the short time Fourier transform (STFT). Six male subjects realized a 40% maximal plantar flexion isometric voluntary contraction until fatigue in two knee positions. Electrodes were positioned on gastrocnemius medialis, gastrocnemius lateralis and soleus muscles. The torque (TO) and EMG signals were synchronized. The RMS and the median of the IMF values were obtained, respectively, for each 250 ms and 1s windows of signal. Each signal was segmented into 10 epochs, from which the mean values of IMF, RMS and TO were obtained and submitted to linear regressions to determine parameter trends. Friedman test with the Dunn's post hoc were used to test for differences among muscles activation for each knee position and among slopes of regression curves, as well as to observe changes in TS RMS values over time. The results indicate different activation strategies with the knee extended (KE) in contrast to knee flexed (KF). With the KE, the gastrocnemii showed typical fatigue behavior with significant (p<0.05) IMF reductions and RMS increases over time, while soleus showed concomitant RMS and IMF increases (p<0.05) suggesting an increased soleus contribution to the torque production. With KF, the gastrocnemii were under activated, increasing the role of soleus. Thus, time-frequency analysis represented an important tool for TS muscular fatigue evaluation, allowing differentiates the role of soleus muscle.
File Format	HTM / HTML
ISSN	10506411
Issue Number	4
Volume Number	21
e-ISSN	18735711
Journal	Journal of Electromyography and Kinesiology
Language	English
Publisher	Elsevier
Publisher Date	2011-08-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Cardiology Electromyography Isometric Contraction Physiology Knee Joint Muscle Fatigue Muscle, Skeletal Humans Male Range Of Motion, Articular Torque Young Adult Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Neuroscience Neurology (clinical) Biophysics Sports Science

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