Electromechanical delay revisited using very high frame rate ultrasound

Nordez, Antoine, Gallot, Thomas, Catheline, Stefan, Guevel, Arnaud, Cornu, Christophe and Hug, Francois (2009) Electromechanical delay revisited using very high frame rate ultrasound. Journal of Applied Physiology, 106 6: 1970-1975. doi:10.1152/japplphysiol.00221.2009

Author Nordez, Antoine
Gallot, Thomas
Catheline, Stefan
Guevel, Arnaud
Cornu, Christophe
Hug, Francois
Title Electromechanical delay revisited using very high frame rate ultrasound
Journal name Journal of Applied Physiology   Check publisher's open access policy
ISSN 8750-7587
Publication date 2009-06
Year available 2009
Sub-type Article (original research)
DOI 10.1152/japplphysiol.00221.2009
Volume 106
Issue 6
Start page 1970
End page 1975
Total pages 6
Place of publication Bethesda, MD United States
Publisher American Physiological Society
Collection year 2010
Language eng
Formatted abstract
Electromechanical delay (EMD) represents the time lag between muscle activation and muscle force production and is used to assess muscle function in healthy and pathological subjects. There is no experimental methodology to quantify the actual contribution of each series elastic component structures that together contribute to the EMD. We designed the present study to determine, using very high frame rate ultrasound (4 kHz), the onset of muscle fascicles and tendon motion induced by electrical stimulation. Nine subjects underwent two bouts composed of five electrically evoked contractions with the echographic probe maintained over 1) the gastrocnemius medialis muscle belly (muscle trials) and 2) the myotendinous junction of the gastrocnemius medialis muscle (tendon trials). EMD was 11.63 ± 1.51 and 11.67 ± 1.27 ms for muscle trials and tendon trials, respectively. Significant difference (P < 0.001) was found between the onset of muscle fascicles motion (6.05 ± 0.64 ms) and the onset of myotendinous junction motion (8.42 ± 1.63 ms). The noninvasive methodology used in the present study enabled us to determine the relative contribution of the passive part of the series elastic component (47.5 ± 6.0% of EMD) and each of the two main structures of this component (aponeurosis and tendon, representing 20.3 ± 10.7% and 27.6 ± 11.4% of EMD, respectively). The relative contributions of the synaptic transmission, the excitationcontraction coupling, and the active part of the series elastic component could not be directly quantified with our results. However, they suggest a minor role of the active part of the series elastic component that needs to be confirmed by further experiments.
Keyword Muscle
Vastus Medialis Obliquus
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 41 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 28 Aug 2013, 16:44:30 EST by Francois Hug on behalf of School of Health & Rehabilitation Sciences