COMPARATIVE ANALYSIS OF ELECTROMYOGRAPHIC MUSCLE ACTIVITY OF THE HUMAN HAND DURING CYCLIC TURNS OF ISOMETRIC EFFORT VECTOR OF WRIST IN OPPOSITE DIRECTIONS
A.V. Lehedza1, A.V. Gorkovenko1, I.V. Vereshchaka1, M. Dornowski2, A. I. Kostyukov1
- A.A.Bogomoletz Institute of Physiology of National
Academy of Sciences of Ukraine, Kyiv;
- Academy of Physical Education and Sports, Gdansk, Poland
The features of the formation of targeted tonic isometric effort
created by muscles of the shoulder girdle and shoulder
were compared for two opposite changes of the directions
of arbitrary force vector - clockwise and counterclockwise.
The magnitude of the effort vector remained constant. The
intensity of the central motor commands (CMC) was evaluated
according to the area of founded rectified, averaged and
approximated electromyographic (EMG) recorded from the
investigated muscles. The effort development was carried out
in determined direction in operation space of the horizontal
plane under angles of 75° in the shoulder joint and 90° in the
elbow one. The synergic interaction of individual functional
groups of muscles under certain reaction force was found. In
the case of space, it was determined the main activity areas
of the investigated muscles within the operating space. The
differences were shown in the levels of EMG amplitude in opposite
directions bypass of effort vector. Coactivation of flexor
muscles was found, while the extensors showed their activity
only within their functional sectors. Half of the investigated
muscles showed an increase of the EMG amplitude for the
counter-clockwise direction in relation to EMG amplitude for
the clockwise direction. This can be attributed to more complex
patterns of motor commands organization which consistently
addressed to the muscles of the shoulder and forearm caused
by atypical sequence of activation of antagonist muscles
under making hand movements in cyclic mode during tonic
two-joint isometric effort, central motor commands, force vector; electromyogram.
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