@article{Amaral2001,
title={Behavioral-independent features of complex heartbeat dynamics},
author={Amaral LAN, 
Ivanov PC, 
Aoyagi N, 
Hidaka I, 
Tomono S, 
Goldberger AL, 
Stanley HE, 
Yamamoto Y},
abstract={We test whether the complexity of the cardiac interbeat interval time series is simply a consequence of the wide range of scales characterizing human behavior, especially physical activity, by analyzing data taken from healthy adult subjects under three conditions with controls: (i) a "constant routine" protocol where physical activity and postural changes are kept to a minimum, (ii) sympathetic blockade, and (iii) parasympathetic blockade. We find that when fluctuations in physical activity and other behavioral modifiers are minimized, a remarkable level of complexity of heartbeat dynamics remains, while for neuroautonomic blockade the multifractal complexity decreases.},
journal={Physical Review Letters},
volume={86},
doi={https://doi.org/10.1103/physrevlett.86.6026},
year={2001},
month={JUN},
day={25},
pages={6026--6029},
}