CHANGES IN PHYSIOLOGICAL TREMOR PARAMETERS OF THE BRUSH FOR DIFFERENT HUMAN UPPER LIMB MUSCLE ACTIVITY
I.Yu. Gnatchuk, V. V. Manko
- Ivan Franko National University of Lviv, Ukraine
Influence of different types of activity of muscles of the upper
limb on the frequency and amplitude of physiological
tremor in 40 females of 18-19 years old was investigated.
Tests were carried out in two positions of the brush (palm
down and palm rib down) as well as in three positions (at
rest, in postural condition, and during loading). In the position
of the brush with the palm down in the rest, the frequency
of the physiological tremor was along the x-axis 7.74±0.28
Hz, y-axis - 7.38±0.34 Hz, z-axis - 7.47±0.22 Hz, whereas
the amplitude was 0.12±0.01, 0.22±0.02 and 0.24±0.02 mm,
respectively. As a result of displacement of the brush to the
postural condition, the frequency of physiological tremor
increased along the z-axis, which coincides with the force of
gravity, to 8.10±0.18 Hz, and the amplitude increased along
three axes by 33%, 90%, and 216%, respectively. Applying
the load 100 and 200 g led to a decrease in the frequency and
amplitude of the physiological tremor in this position of the
brush. In the position of the brush with a palm rib down, the
frequency data also varied only along the axis, which coincides
with the force of gravity, whereas changes in the amplitude
were not detected, which is explained by the features of the
radial-wrist joint structure. The results could be explained
by different activity and alternation of the muscles involved
in the work when maintaining the brush in a given position.
Consequently, in the state of rest, regardless of the position
of the brush, the muscle tone supporting the radial-wrist joint
practically does not affect the frequency and amplitude of the
physiological tremor. When transferring the limb to the postural
condition, in both cases, statistically significant changes
in the frequency of the physiological tremor are observed only
along the axis, which coincides with the force of gravity. The
tremor amplitude also depends on the load of the limb, but only
in the position of the hand with the palm down.
physiological tremor; frequency and amplitude of physiological tremor; hand brush position; load; radiocarpal joint; accelerometer
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