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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 43 (1980), S. 253-261 
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 36 (1977), S. 239-246 
    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
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  • 3
    ISSN: 1439-6327
    Keywords: Hydration ; Growth hormone ; Prolactin ; Exercise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of progressive rehydration with either water or a carbohydrate solution on the plasma growth hormone (GH) and prolactin (PRL) response to exercise was examined together with plasma somatostatin. Five subjects underwent four 3-h experimental sessions at 36°C in which 25-min exercise periods alternated with 5-min rest periods. The sessions were conducted without fluid replacement (DH) or under rehydration with either water or isosmotic carbohydrate solutions AISO (acid) or NISO (neutral). The fluid was given every 10 min after the 1st h of exercise. Plasma GH increased significantly (p 〈 0.01) under DH after 2 and 3 h of exercise; this increase was prevented by rehydration with water, AISO and NISO. Plasma glucose was significantly higher following AISO and NISO rehydration compared with DH. This possibly influenced the GH response, but there was no difference between plasma glucose levels under DH and water rehydration at any time. The solutions tended to attenuate the increase in heart rate, rectal temperature and plasma cortisol, suggesting that the lack of GH response under rehydration conditions is a result of decreasing physiological stress levels. The GH response could not be explained by plasma somatostatin, which tended to decline in all sessions. Plasma PRL did not increase in any of the sessions, confirming that exercise without rehydration is a more potent stimulator of GH than of PRL. It is concluded that progressive rehydration with water is sufficient to prevent the exercise-induced increase in plasma GH.
    Type of Medium: Electronic Resource
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