Noise has been demonstrated to induce a variety of physiological changes in mammals, such as changes in the cardiovascular homeostasis and in the secretion of hormones. Through hearing impulses are given to the brain stem and the hypothalamus. From formatio reticularis the sympathetic nervous system is influenced. Via the hypophysis, adrenocorticotropic hormone (ACTH), and thyroid-stimulating hormone (TSH) the hypothalamus gives signals to the adrenal medulla and the thyroid gland. The parasympathetic nervous system is also influenced and has a mainly reversed effect compared to the sympathetic nervous system (Algers et al., 1978; Manteuffel, 2002).