@article{leicht_allen_2008,  title={Moderate-term reproducibility of heart rate variability during rest and light to moderate exercise in children},  volume={41},  ISSN={0100-879X},  url={https://doi.org/10.1590/S0100-879X2008000700013},  DOI={10.1590/S0100-879X2008000700013},  number={7},  journal={Brazilian Journal of Medical and Biological Research},  publisher={Associação Brasileira de Divulgação Científica},  author={Leicht, A.S. and Allen, G.D.},  year={2008},  month={Jul},  pages={627–633} }