The recruitment order of scapular muscles depends on the characteristics of the postural task

Abstract 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 u...

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2016-12, Vol.31, p.40-47
Main Authors: Mendez-Rebolledo, Guillermo, Gatica-Rojas, Valeska, Martinez-Valdes, Eduardo, Xie, H.B
Format: Article
Language:English
Subjects:
Anticipatory
Compensatory
Electromyography
Female
Humans
Male
Motor control
Muscle latency
Muscle, Skeletal - innervation
Muscle, Skeletal - physiology
Physical Medicine and Rehabilitation
Posture
Reaction Time
Recruitment, Neurophysiological
Scapula - innervation
Scapula - physiology
Shoulder - physiology
Shoulder Joint - physiology
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Summary:Abstract 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.
ISSN:1050-6411
1873-5711
DOI:10.1016/j.jelekin.2016.09.001