For example, thyroid stimulating hormone (TSH) and growth hormone (GH) are strongly released before sleep and during sleep, respectively. Rapid shorter-term rhythms are termed ultradian, and arise primarily as pulsatile secretory episodes with day-night variation in pulse amplitude, and (occasionally...
Sanford, L. D.; Peacock, L. J. Circadian and ultradian activity rhythms in male Long-Evans rats: Relationship to feeding. J. Inter- discipl. Cycle Res. 22:311-324; 1991.Circadian and ultradian activity rhythms in male Long-Evans rats: Relationship to feeding - Sanford, Peacock - 1991 ...
During the work we revealed the persistence of the ultradian rhythms even when they are masked by circadian rhythms.Moreover, when transients were analyzed in both models, biological and mathematical, we were led to consider the hypothesis that ultradian rhythms could represent a regression to a ...
These results are discussed in terms of evidence for endogenous and exogenous origins of the observed rhythms, and of theories that have postulated the relationship between circadian and ultradian rhythms. It is concluded that the results from the present analyses are difficult to reconcile with the ...
Studies of ultradian rhythms (<1 day) in plants and in yeasts provide insights into the temporal hierarchy of living organisms. Primarily a reflection of intracellular control circuits, special rhythms are temperature-compensated that have evolved as timekeepers. The best understood ultradian clock is...
Healthy men at elevated altitudes show circadian and several ultradian rhythms of single VEs dependent on the hypoxia level. This new methodological approachevaluating the differences between two locations using delta valuespromises to provide deeper insight into the occurrence of premature beats. 展开 ...
Ultra Awareness of Ultradian Rhythms Home Circadian Rhythms, the True Rhythm of Life All of us have internal clocks regulated by the Suprachiasmatic Nuclei which in turn governs our sleep, energy levels, metabolism, our ability to stay focused and alert and even basic cellular processes essential ...
Circadian and Ultradian Rhythms of Free Glucocorticoid Hormone Are Highly Synchronized between the Blood, the Subcutaneous Tissue, and the Brain Total glucocorticoid hormone levels in plasma of various species, including humans, follow a circadian rhythm that is made up from an underlying series of ....
Mutations in the period (per) gene of Drosophila melanogaster affect both circadian and ultradian rhythms. Levels of per gene product undergo circadian oscillation, and it is now shown that there is an underlying oscillation in the level of per RNA. The
Although ultradian rhythms have been described for Tetrahymena thermophila and Euglena gracilis, they appear under different conditions: in the first case, a ... Balzer 被引量: 0发表: 0年 Toward a chronome of Euglena gracilis (Klebs) Euglena gracilis (Klebs) has extensively mapped circadians as...