Journal of Environmental Treatment Techniques
2019, Special Issue on Environment, Management and Economy, Pages: 1003-1005
Republic of Russia. The registration of HRV indices was
carried out during an active orthostatic test (lying down – 5
minutes, standing – 6 minutes). The average age of the
subjects was 28 ± 3.5 years. The data was monitored using
the «Varicard 2.51» complex in the second standard lead, and
the interval cardiogram analysis was performed using the
Iskim-6 program. The study was conducted in accordance
with the recommendations of the working group of the
European Society of Cardiology and the North American
Society of Cardiac Stimulation and Electrophysiology (6, 7).
The classification of the vegetative regulation types is based
on the idea of the presence of central and autonomic contours
of heart rhythm control, among which there are four types of
vegetative regulation:
3
Results and Discussion
Analysis of HRV indices showed that at rest in the
majority of the studied, type III (MPAR) is the predominant
type of vegetative regulation – 45.5% (5 people), type II
(
(
PPCR) is registered in 36.3% of cases (4 people) , Type I
MPCR) and type IV (PPAR) – in 18.2% of cases (1 person
each). The average group value of HRV indices testified to
the predominance of autonomic regulation of heart rhythm
(
type III) in the supine position. When performing an
orthostatic test, a decrease in parasympathetic activity and
tension in the central regulation with activation of
sympathetic effects were observed. This was accompanied by
a statistically significant decrease in MxDMn, RMSSD,
pNN50%, HF (ms2), PHF (%) and the prevalence of SI, PLF
Type
regulation (MPCR)
Type II - pronounced predominance of central
regulation (PPCR)
I - moderate prevalence of central
(
%), LF/HF in the standing position (Table 1). In the initial
autonomic type of regulation of cardiac activity, the
predominance of centralization of heart rhythm control
during orthostatic exposure is one of the optimal types of
reaction (4).
Type III - moderate prevalence of autonomic
regulation (MPAR)
The data analysis under the study also revealed the
paradoxical nature of the vegetative effect, which was
expressed in inhibition of the transmission of the nerve
impulse of the autonomic nervous system due to the
overpotential of the sympathetic channel. For instance, during
the three-time execution of an orthostatic test in the morning
time of day (08 h 30 min) before physical activity, a
paradoxical type of reaction was recorded successively for
three days by an employee of the special purpose detachment.
During the first test, activation of the central structures of
heart rhythm management in response to orthostatic effects is
noted, since the values of MxDM, TP, LF, VLF, ULF
increase and the activity of the sympathetic division of the
autonomic nervous system decreases, the value of the stress
index decreases. In the second study, an increase in LF, VLF
waves and a sharp decrease in ULF waves is recorded, while
the activity of HF waves remains almost unchanged. Such a
reaction to a change in body position is unfavorable and
indicates a decrease in the functional reserves of the body. In
the third trial, a special purpose detachment employee
responds with a significant increase in MxDM, LF and VLF
waves.
Type IV
autonomic regulation (PPAR).
-
pronounced predominance of
For the rapid assessment of the prevailing type of
autonomic regulation, the quantitative criteria for HRV
indices - SI and VLF (5) are taken as the basis. Interpretation
of the
results of an orthostatic test using
cardiointervalography was produced in accordance with the
assessment of vegetative reactivity proposed by R.M.
Baevsky and A.P. Berseneva (1).
Statistical data processing was performed using the Excel
007 software package. Standard methods of variation
statistics were used including the calculation of arithmetic
means, standard deviations, and standard error of the mean.
The results are presented as M ± m (M is the arithmetic
average, m is the error of the arithmetic average). Taking into
account the distribution of indicators close to normal (by
Kolmogorov-Smirnov criterion), the assessment of the
reliability of differences in averages was carried out using
Student's criterion. Used bilateral tests. Differences at
significance levels of p <0.05 were considered statistically
significant.
2
Table 1. Indicators of heart rate variability in employees of a special purpose detachment in orthostatic test (M ± m) (group mean values)
Indicators of
heart rate variability
Significance
Lying position
Standing position
р
MxDMn, мс
RMSSD, мс
pNN50%
SDNN, мс
CV, %
280,5±22,9
48,9±5,81
25,8±5,3
59,0±5,6
6,5±0,6
89,8±11,1
3120,0±710,0
1055,0±250,6
1176,3±366,4
394,0±100,3
495,0±124,1
41,3±4,7
232,2±20,2
27,4±5,5
5,0±1,8
51,5±5,5
6,7±0,6
166,0±30,5
2592,0±603,9
362,0±146,7
1502,0±467,4
327,0±58,8
400,7±69,1
15,4±3,1
<0,01
<0,01
<0,001
˃0,05
˃0,05
<0,05
˃0,05
<0,05
˃0,05
˃0,05
˃0,05
<0,001
<0,001
˃0,05
<0,01
SI, усл.ед.
2
TP, мс
2
HF, мс
2
LF, мс
2
VLF, мс
2
ULF, мс
PHF, %
PLF, %
PVLF, %
LF/HF
42,2±4,1
16,4±2,3
1,4±0,3
66,8±3,6
17,8±2,3
6,9±1,6
1
004