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P1.6 Carotid-Radial Pulse Transit Time Compared to the Pulse Arrival Time to the Capillary Bed of the Finger Tip During and After Aerobic Exercise in Young Healthy Subjects

Abstract

Objectives

Measurement of the propagation times of cardiac-induced pulses along the arterial tree provides an important tool for studying arteries. The aim of our study was to measure the carotid-radial pulse transit time (c-rtT) in young healthy subjects before, during and 20 minutes after aerobic exercise and to compare it with the pulse arrival time to the capillary bed of the finger tip (PATc).

Methods

Following ethical approval eight men (20.8±0.4 years old) were recruited. We measured ECG, arterial blood pressure using Finapres Ohmeda, laser Doppler skin blood flow on the finger pulp and carotid or radial pulse with a tonometer (Millar SPT 30). After 5 minutes supine rest subjects mounted the cycloergometer and started a graded exercise until 85% of their maximal heart rate was reached. They recovered for 20 minutes. c-rtT and PATc were calculated.

Results

Our results revealed that c-rtT exhibited no statistically significant differences before and 20 minutes after exercise (111.3±4.1ms and 109.7±3.5ms), but was significantly decreased at highest workload (90.1±0,2ms). On the other hand PATc was increased 20 minutes after exercise compared to resting values (130.3±8.1ms and 120.7±5.5ms) and significantly decreased at highest workload (104.5±1.6ms). A linear correlation between c-rtT and corresponding RR interval duration during exercise was found (p<0.001) but no correlation between PATc and RR.

Conclusions

During exercise increased sympathetic tone could be the main reason for the decreased c-rtT, but other mechanisms should contribute to the regulation of the finger tip skin microcirculation, where termoregulation plays a major role.

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This is an open access article distributed under the CC BY-NC license http://creativecommons.org/licenses/by/4.0/.

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Potocnik, N., Lenasi, H. P1.6 Carotid-Radial Pulse Transit Time Compared to the Pulse Arrival Time to the Capillary Bed of the Finger Tip During and After Aerobic Exercise in Young Healthy Subjects. Artery Res 8, 130–131 (2014). https://doi.org/10.1016/j.artres.2014.09.087

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  • DOI: https://doi.org/10.1016/j.artres.2014.09.087