Onset and offset exercise response model in electronic terms

Acta Press
Publication Type:
Conference Proceeding
Proceedings of the IASTED International Conference Biomedical Engineering (BioMed 2012), 2012, pp. 122 - 128
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This paper investigated human heart rate (HR) and oxygen uptake (VO2) dynamics to running exercise and developed an electronic circuitry based mathematical model to quantitatively depict the metabolic and energy-generating process at both onset and offset of exercises. In order to investigate transient responses of both HR and VO2, eight healthy male subjects were asked to run on a motor-controlled treadmill exercise under a predefined running protocol. Heart rate and oxygen consumption were monitored and recorded using a COSMED portable gas analyzer (K4b2, Cosmed). The observed experimental results verified the belief that cardio-respiratory responses dynamics at onset and offset of moderate or high intense exercises are significantly different. In order to find a rational explanation for this phenomenon, a novel idea was inspired by applying a simple switchable resistance-capacitor (RC) circuit to unify the complex dynamics at onset and offset of exercises. The proposed physical system can not only analytically explain body's energy-generating process, metabolism and cardio-respiratory responses, but also mathematically account for cardio-respiratory dynamics at both onset and offset of exercises, in which the continuity of the output and states during switching is guaranteed.
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