The characterization of the transit through the anaerobic threshold based on relationships between RR and QRS cardiac intervals

• Published in: PloS one Vol. 14; no. 5; p. e0216938
• Main Authors: Saunoriene, Loreta, Siauciunaite, Vaiva, Vainoras, Alfonsas, Bertasiute, Virginija, Navickas, Zenonas, Ragulskis, Minvydas
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 15.05.2019; Public Library of Science (PLoS)
• Subjects: Adult; Algebra; Algorithms; Anaerobic threshold; Anaerobic Threshold - physiology; Analysis; Biology and Life Sciences; Carbon dioxide; Carbon Dioxide - physiology; Cardiology; Cardiovascular disease; Computer applications; Earth Sciences; Ecology and Environmental Sciences; EKG; Electrocardiography; Electrocardiography - statistics & numerical data; Ergometry; Exercise intensity; Exercise Test; Exhalation - physiology; Health sciences; Healthy Volunteers; Heart; Heart - physiology; Heart rate; Heart Rate - physiology; Humans; Intervals; Laboratories; Load; Male; Medicine and Health Sciences; Middle Aged; Oxygen; Oxygen - physiology; Physical Sciences; Physiology; Recovery; Research and Analysis Methods; Researchers; Transit; Ventilation; Lithuania
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0216938

This paper aims to develop a novel computational technique for the detection of the transit through the anaerobic threshold. This technique uses only cardiac intervals derived from the electrocardiogram and is based on algebraic relationships between RR and QRS intervals. Electrocardiograms are measured during the load and the recovery processes. Algebraic relationships between cardiac intervals are used not only to identify the anaerobic threshold but also to characterise individual features of the person during the transit through the threshold. The ratio between carbon dioxide and oxygen in the exhaled air is used to validate the results. The algebraic relationship between cardiac intervals serves as a stand-alone indicator for both the determination of the anaerobic threshold and the characterization of the performance of the person during the load and the recovery processes.