Volume 132, Number 2, October 2020
|Number of page(s)||7|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||22 December 2020|
Decreased coupling among respiratory variables with effort accumulation
1 Faculty of Physics, Warsaw University of Technology - Koszykowa 75, 00-662 Warsaw, Poland
2 University School of Health and Sport (EUSES), University of Girona - Calle Francesc Macià, 6517190 Girona, Spain
3 Complex Systems in Sport, Institut Nacional d'Educació Física de Catalunya (INEFC), Universitat de Barcelona Avinguda de l'Estadi, 12-22, 08038 Barcelona, Spain
4 Faculty of Electronics and Information Technology, Warsaw University of Technology - Nowowiejska 15/19, 00-665, Warsaw, Poland
5 Faculty of Physical Education, Sport and Health, Ss Cyril and Methodius University of Skopje - Dimche Mirchev 3, 1000 Skopje, Republic of Macedonia
6 Department Physiological Sciences, Universitat de Barcelona (UB) - Gran Via de les Corts Catalanes, 585, 08007 Barcelona, Spain
Received: 18 June 2020
Accepted: 14 September 2020
We applied symbolic transfer entropy (STE) for the detection of directed couplings between pulmonary variables registered during repeated progressive and maximal cardiopulmonary exercise tests (CPET). We verified the hypothesis whether effort accumulation has an impact on the decrease of the level of coupling between ventilation (VEbtps), fraction of expired oxygen (FeO2) and carbon dioxide (FeCO2). A group of 10 volunteers performed two consecutive CPET (T1 and T2) on a cycle ergometer. STE values obtained for T1 are higher than for T2, which indicates that the interaction of these variables is sensitive to effort accumulation. The difference of the STE between signals corresponds to the dominating direction of the coupling and indicates that FeO2 and FeCO2 drives the VEbtps.
PACS: 89.70.Cf – Entropy and other measures of information / 87.19.lo – Information theory / 87.19.Wx – Pneumodyamics, respiration
© 2020 The author(s)
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