Burtis CA, Ashwood ER (eds) (1996) Tietz fundamentals of clinical chemistry, 4th edn. Saunders, Philadelphia, pp 772–821
Cheng Y, Schwartz J, Vokonas PS, Weiss ST, Aro A, Hu H (1998) Electrocardiographic conduction disturbances in association with low-level lead exposure (the Normative Aging Study). Am J Cardiol 82:594–599
Elinder CG, Piscator M (1978) Cadmium and Zn relationships. Environ Health Perspect 25:129–132
Goyer RA (1995) Nutrition and metal toxicity. Am J Clin Nutr 61 [Suppl]:646S–650S
Goyer RA (1996) Toxic effects of metals. In: Klaassen CD, Amdur MO, Doull J (eds) Casarett and Doull’s toxicology: the basic science of poisons, 5th edn. McGraw-Hill, New York, pp 691–736
Herber RF, Christensen JM, Sabbioni E (1997) Critical evaluation and review of cadmium concentrations in blood for use in occupational health according to the TRACY protocol. Int Arch Occup Environ Health 69:372–378
Jensen-Urstad K, Storck N, Bouvier F, Ericson M, Lindblad LE, Jensen-Urstad M (1997) Heart rate variability in healthy subjects is related to age and gender. Acta Physiol Scand 160:235–241
Liao D, Barnes RW, Chambless LE, Simpson RJ Jr, Sorlie P, Heiss G (1995) Age, race, and sex differences in autonomic cardiac function measured by spectral analysis of heart rate variability—the ARIC study. Am J Cardiol 76:906–912
Magari SR, Schwartz J, Williams PL, Hauser R, Smith TJ, Christiani DC (2002) The association of particulate air metal concentrations with heart rate variability. Environ Health Perspect 110:875–880
Pieper SJ, Hammill SC (1995) Heart rate variability: technique and investigational applications in cardiovascular medicine. Mayo Clin Proc 70:955–964
Sorensen N, Murata K, Budtz-Jorgensen E, Weihe P, Grandjean P (1999) Prenatal methylmercury exposure as a cardiovascular risk factor at seven years of age. Epidemiology 10:370–375
Task Force of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology (1996) Heart rate variability: standards of measurement, physiological interpretation and clinical use. Circulation 93:1043–1065
Tsuji H, Larson MG, Venditti FJ Jr, Manders ES, Evans JC, Feldman CL, Levy D (1996) Impact of reduced heart rate variability on risk for cardiac events. The Framingham heart study. Circulation 94:2850–2855
US Center for Disease Control and Prevention (2003) Second national report on human exposure to environmental chemicals [online]. Available from URL: http://www.cdc.gov/exposurereport/pdf/secondner.pdf
Vallee BL, Ulmer DD (1972) Biochemical effects of mercury, Cd, and Pb. Annu Rev Biochem 41:91–128
van Ravenswaaij-Arts CM, Kollee LA, Hopman JC, Stoelinga GB, van Geijn HP (1993) Heart rate variability. Ann Intern Med 118:436–447
Vupputuri S, He J, Muntner P, Bazzano LA, Whelton PK, Batuman V (2003) Blood lead level is associated with elevated blood pressure in blacks. Hypertension 41:463–468