Abstract
KLEITMAN has postulated that a ‘basic rest-activity cycle’ exists which is an extension of the rhythmically recurring patterns of sleep cycles in man1. Such ultradian rhythms, with a periodicity of approximately 90 min in non-human primates, have been associated with motor activity2 and feeding behaviour3. Additionally, we have reported that plasma cortisol secretion in the rhesus monkey occurred in 90-min cycles which were synchronised for an entire group of monkeys over a 6-mth period, despite individual housing conditions of the animals4. Plasma noradrenaline (NA) is a reliable indicator of sympathetic nervous system activity5, in part because of its short half life of less than 2 min6. If Kleitman's hypothesis is correct, one might expect to see a basic 90-min rhythm for plasma NA, even though its short half life would favour the finding of a much faster rhythm. We have found a 90-min rhythm for plasma NA in the rhesus monkey, which was temporally synchronised for the experimental group as a whole. The presence of this rhythm suggests a tonic waxing and waning of sympathetic nervous system activity compatible with Kleitman's hypothesis.
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References
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LEVIN, B., GOLDSTEIN, A. & NATELSON, B. Ultradian rhythm of plasma noradrenaline in rhesus monkeys. Nature 272, 164–166 (1978). https://doi.org/10.1038/272164a0
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DOI: https://doi.org/10.1038/272164a0
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