Ritmos biológicos em índios Guarani adultos / Biological rhythms in Guarani adult indians

AUTOR(ES)

Daniela Wey Camilo Lapa

DATA DE PUBLICAÇÃO

2007

RESUMO

Communities living in areas without electricity present biological rhythms synchronized by the day/night cycle and social schedules; it seems possible to detect seasonal differences in their behaviour. In urban areas electricity allow us to organize our activities according to our interests. This behaviour has been pointed as a cause for the absence of seasonality in human biological rhythms. The present naturalistic phenomenological study of Guarani indians that living in no electricity houses allowed us to think about the presence of seasonality in biological rhythms. Wrist temperature and activity/rest rhythms of 21 indians were compared between winter and summer. The temperature profile did not change, but a seasonal difference was found for amplitude and MESOR values which may be related to metabolic-behavioral processes involved in thermoregulation. In summer the vasodilation is intense and the heat dissipation is maximum (with low variability), the opposite tends to occur in winter. We did not find seasonality in acrophase values between subjects, and we also found the same correlation described for urban populations: a phase advance of body temperature in the elderly. From winter to summer the onsets/offset of rest were delayed, with no change in rest duration. For the indians there was no difference in the schedules of rest/activity during the week. The activity/rest cycle was not determined by the day/night cycle but showed a significant correlation with wrist temperature. The adult indians of Boa Vista settlement showed typical characteristics in their biological rhythms of a transition community. The activities in the settlement are synchronized by singular relationships that take place in each season.

ASSUNTO(S)

syncronization temperatura do corpo sincronização índios guarani biological rhythms body temperature ritmos biológicos guarani (indians)

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