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Electromechanical delay in biceps brachii assessed by ultrafast ultrasonography
Author(s) -
Hug François,
Gallot Thomas,
Catheline Stefan,
Nordez Antoine
Publication year - 2011
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.21948
Subject(s) - biceps , fascicle , neuromuscular transmission , contraction (grammar) , anatomy , muscle contraction , excitation–contraction coupling , ultrasonography , ultrasound , medicine , skeletal muscle , surgery , radiology
Using ultrasound we tested the utility of determining the relative contribution of the main muscle structures/mechanisms to the electromechanical delay in the biceps brachii. Nine subjects underwent electrically evoked contractions with the echographic probe maintained over the muscle and the myotendinous junction. No difference was found between the onset of muscle fascicle motion (Dm, 5.57 ± 1.37 ms) and the onset of myotendinous junction motion (Dt, 5.47 ± 1.38 ms), whereas significant differences were found between Dm/Dt and electromechanical delay (approximately 10 ms). Electromechanical delay can be used as a model for studying the effects of neuromuscular disorders or various constraints that affect excitation–contraction coupling and/or muscle force transmission. Muscle Nerve, 2011