7Adeyemi EO, Desai KD, Towsey M, et al. Characterization of autonomic dysfunction in patients with irritable bowel syndrome by means of heart rate variability studies. Am J Gastroenterol 1999; 94 (3): 816 - 23
8Pigozzi F, Alabiso A, Parisi A, et al. Effects of aerobic exercise training on 24 hr profile of heart rate variability in female athletes. J Sports Med Phys Fitness 2001;41(1): 101 -7
9Huikuri HV, Makikallio T, Airaksinen KE, et al. Measurement of heart rate variability: a clinical tool or a research toy? J Am Coll Cardiol 1999; 34 (7): 1878 -83
10Filipe JA, Falcao-Reis F, Castro-Correia J, et al. Assessment of autonomic function in high level athletes by pupillometry. Auton Neurosci 2003; 104 ( 1 ): 66 - 72