ETHNIC DIFFERENCES OF THE CARDIOVASCULAR SYSTEM AND HEART RATE VARIABILITY REACTIVITY ON COLD STIMULATION IN STUDENTS FROM DIFFERENT GEOGRAPHIC REGIONS
V.E. Shekh, G.D. Dubina, L.S. Shchyrova
V.N. Karazin Kharkiv National University, Kharkiv, Ukraine
DOI: https://doi.org/10.15407/fz66.01.035
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Abstract
The effect of cold stress on blood pressure, heart rate, and
heart rate variability (HRV) was studied in 80 young men
with normal pressure and prehypertensive status from different
geographical areas: Ukraine, West Africa, Arab countries, and
India. It was found that under cold stress systolic, diastolic
pressure and heart rate increased simultaneously only in prehypertensive
Ukrainians and Indians. Thus, they significantly
increased the activity of the sympathetic nervous system and/
or had hyperreactivity of the cardiovascular system and lack
of baroreflex regulation. In Africans and Arabs, the response
of the cardiovascular system and HRV to the cold pressor test
were not statistically significant, which may be a manifestation
of decreased sensitivity of cold and pain receptors or inhibition
of another part of cardiovascular reflex regulation. In
normotensive Indians the high- and low-frequency power of
the HRV spectrum increased from 6.558 ± 0.464 and 6.518 ±
0.382 to 7.246 ± 0.429 and 7.005 ± 0.322 Lnms2, respectively.
This indicates an increase of the activity of parasympathetic
nervous system and a tendency to increase the activity of
baroreflex during the cold test.
Keywords:
ethnic differences; cardiovascular system; heart rate variability; prehypertension, cold stimulation
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