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  • 1
    Electronic Resource
    Electronic Resource
    Plasma catecholamines and pituitary adrenal hormones in response to noise exposure (1980)
    Springer
    European journal of applied physiology 43 (1980), S. 253-261 
    Details
    ISSN: 1439-6327
    Keywords: Noise ; Plasma catecholamines ; Pituitary adrenal hormones ; Man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To evaluate the immediate effect of exposure to a high level of noise on the sympatho-adrenal and pituitary-adrenal systems, measurements were made of circulating catecholamines, growth hormone, ACTH, and cortisol in seven normal male subjects. They were studied on two random experimental days: a control day and a noise-exposure day with an intermittent noise alternating between 99 dB (A) and 45 dB (A) for 2 h. Analysis did not reveal any variation in the plasma levels of norepinephrine (NE), epinephrine (E) or dopamine (D), measured every 20 min, which might have been related to noise exposure. Similarly, analysis of the 2-h urine samples collected from 8 a.m. to 2 p.m. revealed no significant changes in urinary catecholamine excretion. Plasma levels of GH and ACTH did not differ significantly from those for control days, but cortisol showed a brief, significant levelling-off in its pattern during the exposure period. The data demonstrate that exposure to a high level of noise, although considered as “unpleasant”, does not induce any important endocrinological changes in man. These conclusions differ from those for studies on animals where reactions to noise may be related to a more general stressing situation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00421839
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Physiological effects of dehydration and rehydration with water and acidic or neutral carbohydrate electrolyte solutions (1990)
    Springer
    European journal of applied physiology 60 (1990), S. 209-216 
    Details
    ISSN: 1439-6327
    Keywords: Exercise ; Temperature regulation ; Sweat rate ; Cardiovascular responses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Five healthy young men exercised on an ergocycle for six 25-min periods separated by 5-min rest intervals in a warm dry environment (36°C). After 1 h of exercise without fluid intake, the subjects continued to be dehydrated or were rehydrated either with water (W) or with isosmotic electrolyte carbohydrate solutions, either acidic (AISO) or close to neutrality (NISO). The average amount of the fluid ingested progressively every 10 min (120 ml) at 20°C was calculated so as to compensate for 80% of the whole body water loss due to exercise in the heat. Dehydration associated with hyperosmotic hypovolaemia elicited large increases in heart rate (HR), and in rectal temperature (T re), while no decrease was found in either whole body or local sweat rates. Rehydration with water significantly reduced the observed disturbances, except for plasma osmolality and Na+ concentration which were significantly lower than normal. With both AISO and NISO there was no plasma volume reduction and osmolality increase. Although a plasma volume expansion was induced by NISO ingestion, the cardiac cost was not improved, as reflected by the absence of a decrease in HR. With NISO, sweating was not enhanced andT re tended to remain higher. It is concluded that efficient rehydration requires the avoidance of plasma volume expansion at the expense of interstitial and intracellular rehydration. During rehydration by oral ingestion of fluid, the pH of the drink may be an important factor; its effect remains unclear, however.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00839161
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Failure of noise exposure to modify temporal patterns of plasma cortisol in man (1977)
    Springer
    European journal of applied physiology 36 (1977), S. 239-246 
    Details
    ISSN: 1439-6327
    Keywords: Plasma cortisol ; Noise exposure ; Man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of this investigation was to assess the modification in the temporal pattern of plasma cortisol levels during exposure to noises of different intensities, frequencies and durations. Plasma cortisol concentrations were measured from 08.00 h to 15.00 h at 10 min intervals in eight subjects on a control day and one or two exposure days. Noise exposures induced no significant increase in plasma cortisol concentration. It is concluded that noise, at “safe” levels for human hearing conservation, when not associated with other potentially noxious stimuli does not cause hyperactivity of the pituitary-adrenocortical system. These results do not tally with those from animal studies where noise is known to activate corticotrophin (ACTH) secretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423049
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    Paper (German National Licenses)
    Fulltext
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