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Reindeer in the Arctic reduce sleep need during rumination.
Furrer, Melanie; Meier, Sara A; Jan, Maxime; Franken, Paul; Sundset, Monica A; Brown, Steven A; Wagner, Gabriela C; Huber, Reto.
Afiliação
  • Furrer M; Child Development Center and Children's Research Center, University Children's Hospital Zurich, University of Zurich, Steinwiesstrasse 75, 8032 Zurich, Switzerland.
  • Meier SA; Institute of Pharmacology and Toxicology, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
  • Jan M; Center for Integrative Genomics, University of Lausanne, Génopode building, 1015 Lausanne, Switzerland; Bioinformatics Competence Center, University of Lausanne, Génopode building, 1015 Lausanne, Switzerland.
  • Franken P; Center for Integrative Genomics, University of Lausanne, Génopode building, 1015 Lausanne, Switzerland.
  • Sundset MA; Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Framstredet 39, 9019 Tromsø, Norway.
  • Brown SA; Institute of Pharmacology and Toxicology, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
  • Wagner GC; Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Framstredet 39, 9019 Tromsø, Norway; Division of Forest and Forest Resources, Norwegian Institute of Bioeconomy Research, Holtvegen 66, 9016 Tromsø, Norway. Electronic address: gabriela.wagner@nibio.no.
  • Huber R; Child Development Center and Children's Research Center, University Children's Hospital Zurich, University of Zurich, Steinwiesstrasse 75, 8032 Zurich, Switzerland; Department of Child and Adolescent Psychiatry and Psychotherapy, Psychiatric Hospital Zurich, University of Zurich, Lenggstrasse 31, 80
Curr Biol ; 34(2): 427-433.e5, 2024 01 22.
Article em En | MEDLINE | ID: mdl-38141616
ABSTRACT
Timing and quantity of sleep depend on a circadian (∼24-h) rhythm and a specific sleep requirement.1 Sleep curtailment results in a homeostatic rebound of more and deeper sleep, the latter reflected in increased electroencephalographic (EEG) slow-wave activity (SWA) during non-rapid eye movement (NREM) sleep.2 Circadian rhythms are synchronized by the light-dark cycle but persist under constant conditions.3,4,5 Strikingly, arctic reindeer behavior is arrhythmic during the solstices.6 Moreover, the Arctic's extreme seasonal environmental changes cause large variations in overall activity and food intake.7 We hypothesized that the maintenance of optimal functioning under these extremely fluctuating conditions would require adaptations not only in daily activity patterns but also in the homeostatic regulation of sleep. We studied sleep using non-invasive EEG in four Eurasian tundra reindeer (Rangifer tarandus tarandus) in Tromsø, Norway (69°N) during the fall equinox and both solstices. As expected, sleep-wake rhythms paralleled daily activity distribution, and sleep deprivation resulted in a homeostatic rebound in all seasons. Yet, these sleep rebounds were smaller in summer and fall than in winter. Surprisingly, SWA decreased not only during NREM sleep but also during rumination. Quantitative modeling revealed that sleep pressure decayed at similar rates during the two behavioral states. Finally, reindeer spent less time in NREM sleep the more they ruminated. These results suggest that they can sleep during rumination. The ability to reduce sleep need during rumination-undisturbed phases for both sleep recovery and digestion-might allow for near-constant feeding in the arctic summer.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Rena Limite: Animals Idioma: En Revista: Curr Biol Assunto da revista: BIOLOGIA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Suíça

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Rena Limite: Animals Idioma: En Revista: Curr Biol Assunto da revista: BIOLOGIA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Suíça