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| Titel: |
Independence between Rhythms of Temperature and Progesterone in Mares |
| Auteur: |
Caldas, Maria Clara Soares Fleury, Jo'Junqueira Costa-Veto, Jo'Batista Figueiredo Ara, John Fontenele Marques, Nelson Silva, Alzira Am Martins Rosa E. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 31 (2000) nr. 1 pagina's 108-116 |
| Jaar: |
2000-02-01 |
| Inhoud: |
We investigated the ultradian and diurnal body temperature and plasma progesterone concentration rhythms and the temporal relationship between them in mares during the midluteal phase. Data were obtained from 6 mares at 3-h intervals for 3 consecutive days. Cosinor analysis showed that body temperature acrophases occurred in the evening, whereas the progesterone acrophases occurred in the early morning (3 mares) and at night (3 mares). The spectral analysis of the temperature data showed periods of 24 hr for all mares and of 8 hr for 1 mare. In contrast, the periods observed for plasma progesterone concentration were quite divergent (24 and 12 hr). The small variation in the rhythmic parameters of body temperature suggests that its oscillator system is stable. No phase relationship was detected between the rhythmometric parameters of body temperature and plasma progesterone concentration, suggesting that the physiological mechanisms of control of the 24 hr and ultradian rhythm of the two variables are not coupled during the midluteal phase. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 11 gevonden artikelen
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