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Wearable devices for studying microvascular reactivity – it is feasible?

Postolache, O. ; Postolache, G. ; Trandabat, A. ; Plopa, O. ; Girão, P.M.

Wearable devices for studying microvascular reactivity – it is feasible? , Proc IEEE Conf. on e-Health and Bioengineering - EHB, Iasi, Romania, Vol. 1, pp. 1 - 5, November, 2019.

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Abstract
We investigate what information can be obtained on
daily changes in microcirculation using wearable technologies in
out-of hospital or laboratory setting. The pulse wave,
electrocardiogram, body temperature and blood pressure data
obtained from seven days with normal physical activity was
compared with data from seven days with 50% increase in
physical activity. The number of steps and heart rate during
daily activities were acquired using an electronic wrist watch.
Radial artery and big toe digital artery pulse wave signals, wrist
and big toe skin temperature, heart rate variability, were
analyzed. The sympathetic nervous system influence on
microcirculation was evaluated using frequency domain analysis
of heart rate variability. The plantar signal was more influenced
by movements artifact than pulse wave signal from radial artery.
Low frequency component and ratio of low and high frequency
component of heart rate variability, associated with sympathetic
branch of autonomic nervous system was higher at night than in
the morning and after positional changes. LF/HF ratio decreased
in the week with more physical activity. Relevant information on
determinants of microcirculation changes can be obtained using
multimodal sensing supported by small devices that measure
individual and environmental parameters.