Effects of controlled breathing, mental activity and mental stress with or without verbalization on heart rate variability - Bernardi, L.; Wdowczyk-Szulc, J.; Valenti, C.; Castoldi, S.; Passino, C.; Spadacini, G.; Sleight, P. (Journal of the American College of Cardiology, 2000)
Keywords: heart rate variability; respiration; psychoregulation; psychic process; sport psychology; stress; USA; social sciences; biological and medical sciences