@article{herdy_fay_bornschein_stein_2003,  title={Importance of heart rate analysis in exercise tolerance test},  volume={9},  ISSN={1517-8692},  url={https://doi.org/10.1590/S1517-86922003000400006},  DOI={10.1590/S1517-86922003000400006},  number={4},  journal={Revista Brasileira de Medicina do Esporte},  publisher={Sociedade Brasileira de Medicina do Exercício e do Esporte},  author={Herdy, Artur Haddad and Fay, Carlos Eduardo Schio and Bornschein, Christian and Stein, Ricardo},  year={2003},  month={Jul},  pages={252–256} }