TY  - JOUR
A1  - Mendez-Rebolledo, Guillermo
A1  - Gatica-Rojas, Valeska
A1  - Martinez-Valdes, Eduardo Andrés
A1  - Xie, H. B.
T1  - The recruitment order of scapular muscles depends on the characteristics of the postural task
JF  - Journal of electromyography and kinesiology
N2  - Previous studies show that the scapular muscle recruitment order could possibly change according to the characteristics of the postural task. We aimed to compare the activation latencies of serratus anterior (SA), upper, middle, and lower trapezius (UT, MT and LT, respectively) between an unpredictable perturbation (sudden arm destabilization) and a predictable task (voluntary arm raise) and, to determine the differences in the muscle recruitment order in each task. The electromyographic signals of 23 participants were recorded while the tasks were performed. All scapular muscles showed earlier onset latency in the voluntary arm raise than in the sudden arm destabilization. No significant differences were observed in the muscle recruitment order for the sudden arm destabilization (p > 0.05). Conversely, for voluntary arm raise the MT, LT SA and anterior deltoid (AD) were activated significantly earlier than the UT (p < 0.001). Scapular muscles present a specific recruitment order during a predictable task: SA was activated prior to the AD and the UT after the AD, in a recruitment order of SA, AD, UT, MT, and LT. While in an unpredictable motor task, all muscles were activated after the destabilization without a specific recruitment order, but rather a simultaneous activation. (C) 2016 Elsevier Ltd. All rights reserved.
KW  - Reaction time
KW  - Muscle latency
KW  - Electromyography
KW  - Motor control
KW  - Anticipatory
KW  - Compensatory
Y1  - 2016
U6  - https://doi.org/10.1016/j.jelekin.2016.09.001
SN  - 1050-6411
SN  - 1873-5711
VL  - 31
SP  - 40
EP  - 47
PB  - Elsevier
CY  - Oxford
ER  -