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ISSN 2522-9028 (Print)
ISSN 2522-9036 (Online)

Fiziologichnyi Zhurnal

is a scientific journal issued by the

Bogomoletz Institute of Physiology
National Academy of Sciences of Ukraine

Editor-in-chief: V.F. Sagach

The journal was founded in 1955 as
1955 – 1977 "Fiziolohichnyi zhurnal" (ISSN 0015 – 3311)
1978 – 1993 "Fiziologicheskii zhurnal" (ISSN 0201 – 8489)
1994 – 2016 "Fiziolohichnyi zhurnal" (ISSN 0201 – 8489)
2017 – "Fiziolohichnyi zhurnal" (ISSN 2522-9028)

Fiziol. Zh. 2020; 66(1): 35-43


V.E. Shekh, G.D. Dubina, L.S. Shchyrova

    V.N. Karazin Kharkiv National University, Kharkiv, Ukraine


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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