Population
Human subjects
Design
Other
Authors
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Supports exploration of ultradian heart rate rhythms; leaves open any clinical relevance or application.
Demonstrates the presence of a 90-minute ultradian rhythm in resting human heart rate that is modulated by a circadian rhythm.
Orr et al. (1974) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: