Before revision:  As a first-pass application of our method, we provide evidence in favor of the hypothesis that heart rate variability is not chaotic  , and instead reflects a nonlinear stochastic process in both health and disease.
After revision:  As a first-pass application of our method, we provide evidence in favor of the hypothesis that heart rate variability is not chaotic as some have proposed , and instead reflects a nonlinear stochastic process in both health and disease.