WEARABLE LASER DOPPLER FLOWMETRY DEVICES FOR ASSESSING THE EFFECT OF HYPER- AND HYPOVENTILATION RESPIRATORY YOGA EXERCISES ON PERIPHERAL BLOOD FLOW PARAMETERS
1* Loktionova Yu.I., 2 Frolov A.V., 1 Zharkikh E.V., 3 Sidorov V.V., 4 Tankanag A.V., 1 Dunaev A.V.
1 Orel State University named after I.S. Turgenev, Russia, Orel,
2 Ltd. St. Petersburg Institute of Oriental Methods of Rehabilitation, Russia, St. Petersburg,
3 SPE «LAZMA» Ltd, Russia, Moscow,
4 Institute of Cell Biophysics of the Russian Academy of Sciences, Pushchino, Russia
Abstract
Yoga breathing exercises are an arbitrary change in the minute volume of breathing upward (hyperventilation) and downward (hypoventilation) with the maximum respiratory volume and corresponding changes in gas exchange. The aim of this work was to assess the effect of hypo- and hyperventilation yoga breathing exercises on the parameters of peripheral blood flow and their relationship with parameters of spirometry and gas analysis.
The study included 22 conditionally healthy volunteers (16 men and 6 women). Blood perfusion was registered by distributed system of portable analyzers "LAZMA-PF" (SPE "LAZMA" Ltd., Moscow). The devices have identical channels for recording skin microcirculation by laser Doppler flowmetry, which also allows evaluating the work of peripheral blood flow regulation mechanisms.
The devices were fixed symmetrically to the right and left on the forehead, third fingers and first toes. Study was carried out at 3 stages: stage 1 and 3 implied normal uncontrolled breathing; at stage 2 volunteers achieved hypoventilation (respiratory rate 1-1.5 times per minute) and hyperventilation (respiratory rate 2-3 times per minute), that was confirmed by spirometry and gas analysis (spirometer MAS-2C («Belintelmed», Belarus)).
Correlation between the parameters of blood microcirculation and gas analysis during free breathing and hypoventilation was found. After hypoventilation, the contribution of the myogenic component to the overall perfusion during measurements on the forehead and fingers was higher than after hyperventilation. In the toes the contribution of the neurogenic component was higher after hyperventilation.
The results obtained can be useful in studying the peculiarities of the mechanisms of oxygen delivery to biological tissues, and will also allow us to develop an instrumental method for monitoring the performance of full breathing exercises and their effectiveness in rehabilitation.
Loktionova Yu.I., Zharkikh E.V. and Dunaev A.V. thank the RFBR for financial support of studies No. 20-08-01153 A and No. 19-29-14194, respectively.
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Yulia Loktionova
Orel State University named after I.S. Turgenev, Russia, Ore
Russia
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