1. Aubert AE, Seps B, Beckers F (2003) Heart rate variability in athletes. Sports Med 33:889–919
2. Buccelletti F, Bocci MG, Gilardi E, Fiore V, Calcinaro S, Fragnoli C, Maviglia R, Franceschi F (2012) Linear and nonlinear heart rate variability indexes in clinical practice. Comput Math Methods Med 2012:219080. doi:10.1155/2012/219080
3. Carter JB, Banister EW, Blaber AP (2003) Effect of endurance exercise on autonomic control of heart rate. Sports Med 33:33–46
4. Costa de Rezende Barbosa MP, Silva NT, Azevedo FM, Pastre CM, Vanderlei LCM (2014) Comparison of Polar RS800G3 heart rate monitor with Polar S810i and electrocardiogram to obtain the series of RR intervals and analysis of heart rate variability at rest. Clin Physiol Funct Imaging. doi:10.1111/cpf.12203
5. Dahlstrom N, Nahlinder S (2006) A comparison of two recorders for obtaining in-flight heart rate data. Appl Psychophysiol Biofeedback 31:273–279