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EMG Activity of the Shoulder Girdle Muscles of Humans after Surgical Refixation of the Ruptured m. Pectoralis Major Tendon under Conditions of Simple Bimanual Motor Acts

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Neurophysiology Aims and scope

In six men with injured m. pectoralis major and rupture of its tendon, subsequent reconstructive surgery, and a cycle of rehabilitation physical training, mechanograms of motor phenomena and EMG activity of four pairs of muscles of the shoulder girdle were recorded during tests with simple synchronous bimanual movements in which the mentioned muscles were involved. The experimental setup included a mechanotronic device with a coordinate table and a rail with a carriage and a force meter. Holding the rail by both hands, the subject had to either generate a static force with the rail and carriage being immobile, or make test movements according to the calibration trajectories, tracking these forces or movements with the help of visual feedback. The data were compared with similar data obtained in a control group of six healthy men of a comparable age. Special attention was paid to the analysis of the accuracy of performing motor test tasks, the asymmetry of EMG activity of the injured and intact m. pectoralis major, and manifestations of hysteresis in EMGs of shoulder girdle muscles. It was found that all the mentioned indices for the traumatized muscle in the group of patients did not show statistically significant differences compared with those of the intact muscle and similar muscles of the tested control group. It is concluded that the proposed restorative surgical intervention followed by an adequate cycle of rehabilitation training is effective and gives satisfactory results.

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Authors and Affiliations

  1. Institute of Traumatology and Orthopedics, National Academy of Medical Sciences of Ukraine, Kyiv, Ukraine

    Yu. A. Kulyk & S. S. Strafun

  2. Department of Movement Physiology, Bogomolets Institute of Physiology, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    A. V. Gorkovenko

Authors
  1. Yu. A. Kulyk
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  2. S. S. Strafun
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Correspondence to A. V. Gorkovenko.

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Kulyk, Y.A., Strafun, S.S. & Gorkovenko, A.V. EMG Activity of the Shoulder Girdle Muscles of Humans after Surgical Refixation of the Ruptured m. Pectoralis Major Tendon under Conditions of Simple Bimanual Motor Acts. Neurophysiology 54, 59–72 (2022). https://doi.org/10.1007/s11062-023-09936-0

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