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  Effects of infrared radiation on the diurnal rhythms of melatonin, rectal temperature and heart rate
 
 
Titel: Effects of infrared radiation on the diurnal rhythms of melatonin, rectal temperature and heart rate
Auteur: Griefahn, Barbara
Könemund, Christa
Blaszkewicz, Meinolf
Verschenen in: Occupational ergonomics
Paginering: Jaargang 6 (2006) nr. 1 pagina's 47-53
Jaar: 2006-09-07
Inhoud: Infrared radiation presented in the early night was expected to delay the circadian rhythm via suppression of melatonin synthesis. Seven healthy men (16-22 yrs) had completed a constant routine (24-h bedrest, <30 lux, 18°C) and 2 experimental sessions where bright light (BL, 1 500 lux) or infrared radiation (IR, 65°C) was applied from 1700 to 0100 h. Salivary melatonin levels were determined hourly, rectal temperature and heart rate continuously. Melatonin synthesis was suppressed by BL; the onset and the maximum of the melatonin profile and the minima of rectal temperature and heart rate were then delayed thus indicating a circadian effect. IR did not affect melatonin concentration whereas the minima of rectal temperature and heart rate were delayed indicating a dissociation due to the heat-induced elevation of both the latter variables rather than a chronobiologic effect. This study does not indicate that infrared radiation affects the circadian rhythm in night shift workers.
Uitgever: IOS Press
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

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