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The influence of prolonged vibration on motor unit behavior
Author(s) -
Mosier Eric M.,
Herda Trent J.,
Trevino Michael A.,
Miller Jonathan D.
Publication year - 2017
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.25270
Subject(s) - isometric exercise , electromyography , motor unit , medicine , motor unit recruitment , vastus lateralis muscle , physical medicine and rehabilitation , anatomy , cardiology , skeletal muscle
: The purpose of this study was to determine the effects of vibration (VIB) on motor unit (MU) behavior of the vastus lateralis (VL) muscle during a 40% maximal voluntary contraction (MVC). Methods : Eleven healthy (age 21.3 ± 2.6 years) individuals participated in the study. Surface electromyography (EMG) data were recorded from the VL during isometric trapezoidal muscle contractions at 40% MVC. Firing events of single MUs and EMG amplitude were reported for the first, middle, and final seconds of a 12‐second steady force segment at 40% MVC. VIB was applied at 55 H z to the patellar tendon for 15 minutes before and continued throughout the remainder of testing (VIB) or remained off (CON). Results : There were significant increases in MU firing rates during VIB in comparison to CON and no differences in EMG amplitude between VIB and CON. Conclusion : The VIB‐mediated reduction in muscle spindle function altered MU behavior at 40% MVC. Muscle Nerve 55 : 500–507, 2017