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1980 (1)
1979 (1)
1Author    A. Johnsson, W. Engelmann, W. Klemke, AudTveito EkseRequires cookie*
 Title    Free-Running Human Circadian Rhythms in Svalbard  
 Abstract    The body temperature, activity-rest time, electrolytes of urine samples and mood was measured in two persons during a 19 day period under continuous light conditions in the arctic (vicinity of Ny Alesund, Svalbard-Spitsbergen). For temperature recording a new thermoprobe and a portable printer was used. Possible week Zeitgeber of the 24 hour day did not synchronize the circadian system, since circadian rhythms of about 26 hours were found. These results open up the pos­ sibility to study effects of drugs on the circadian system of humans under Svalbard conditions. In tro d u c tio n 
  Reference    Z. Naturforsch. 34c, 470 (1979); received March 13 1979 
  Published    1979 
  Keywords    Circadian Rhythms, Body Temperature, Activity, Urine Electrolytes, Humans, Svalbard-Spitsbergen 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0470.pdf 
 Identifier    ZNC-1979-34c-0470 
 Volume    34 
2Author    Anders Johnsson, Wolfgang Engelmann, Burkhard Pflug, W. Aldem, Ar KlemkeRequires cookie*
 Title    Influence of Lithium Ions on Human Circadian Rhythms  
 Abstract    Lithium carbonate lengthens the circadian period in humans under temporal isolation (arctic summer four groups. L i+ ions are known to change the period length of several circadian rhythm s in plants and animals [1], In all cases reported so far the effect is a lengthening o f the free running period. An experiment has been performed on a single person in an isolation unit to test whether L i+ acts on hum an circadian rhythms and the results provided have not been conclusive [2]. We have conducted an experiment to determine the influence o f L i+ on the hum an circadian system under arctic sum m er conditions. The continuous light and abscence o f other 24 h tim e cues allows free run o f hum an circadian rhythms [3]. In this brief report, we present some salient results of the effects of Li+ on the tem perature-, sleep-wakefulness-, and activity rhythm in some humans. More details of this investigation will be published elsewhere. 
  Reference    Z. Naturforsch. 35c, 503—507 (1980); received January 14 1980 
  Published    1980 
  Keywords    Dedicated to Prof C H Hertz, Lund University, Sweden, on His 60th Birthday Circadian Rhythms, Lithium, Body Temperature, Activity, Svalbard-Spitsbergen 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0503.pdf 
 Identifier    ZNC-1980-35c-0503 
 Volume    35