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Cardiovascular response to physical stress based on control system theory principles

We studied the heart rate and the blood pressure responses to a stepwise physical stress with different intensity based on control system theory principles. We found that in a certain range of intensities both the heart rate and the blood pressure regulation can be represented by a simple linear feedback model. We suggest a typical response model to physical stress that is both reproducible and scalable for a given individual. The suggested approach could be useful to estimate the cardiovascular system functional status.