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Motor unit control strategies of endurance‐ versus resistance‐trained individuals
Author(s) -
Herda Trent J.,
Siedlik Jacob A.,
Trevino Michael A.,
Cooper Michael A.,
Weir Joseph P.
Publication year - 2015
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.24597
Subject(s) - isometric exercise , motor unit , electromyography , motor unit recruitment , physical medicine and rehabilitation , vastus lateralis muscle , muscle fatigue , medicine , muscle contraction , mathematics , physical therapy , anatomy , skeletal muscle
: We examined motor unit (MU) control properties of resistance‐trained (RT) and endurance‐trained (ET) individuals. Methods : Five RT (age 25 ± 4 years) and 5 ET (age 19 ± 1 years) subjects participated. Surface electromyography (EMG) data were recorded from the vastus lateralis during isometric trapezoid muscle actions at 40% and 70% of maximal voluntary contraction. Decomposition and wavelet transform techniques were applied to the EMG signals to extract the firing events of single MUs and EMG intensity across the frequency spectrum. Results : There were significant differences between RT and ET for the mean MU firing rate and derecruitment threshold versus recruitment threshold relationships and EMG intensity at various wavelet bands during the linearly increasing, steady force, and linearly decreasing segments of the trapezoid contraction. Conclusions : MU behavior is altered as a function of training status and is likely the result of differences in the physical properties of the MU. Muscle Nerve 52 : 832–843, 2015