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Analysis of heart rate and oxygen uptake kinetics studied by two different pseudo-random binary sequence work rate

U Drescher¹, J Koschate¹, T Schiffer²

¹Institute of Physiology and Anatomy, Am Sportpark Müngersdorf 6, German Sport University Cologne, Cologne, 50933, Germany.

Respiratory Physiology & Neurobiology

|March 10, 2017

Abstract

Purpose:

The aim of the study was to compare the kinetics responses of heart rate (HR), pulmonary (V˙O₂pulm) and predicted muscular (V˙O₂musc) oxygen uptake between two different pseudo-random binary sequence (PRBS) work rate (WR) amplitudes both below anaerobic threshold.

Methods:

Eight healthy individuals performed two PRBS WR protocols implying changes between 30W and 80W and between 30W and 110W. HR and V˙O₂pulm were measured beat-to-beat and breath-by-breath, respectively. V˙O₂musc was estimated applying the approach of Hoffmann et al. (Eur J Appl Physiol 113: 1745-1754, 2013) considering a circulatory model for venous return and cross-correlation functions (CCF) for the kinetics analysis.

Results:

HR and V˙O₂musc kinetics seem to be independent of WR intensity (p>0.05). V˙O₂pulm kinetics show prominent differences in the lag of the CCF maximum (39±9s; 31±4s; p<0.05).

Conclusions:

A mean difference of 14W between the PRBS WR amplitudes impacts venous return significantly, while HR and V˙O₂musc kinetics remain unchanged.

Keywords:

Kinetics analysis Moderate exercise intensity Oxygen uptake Physiological modeling Venous return

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