Heart attacks that mostly happen in the morning tend to be more severe than cardiac arrests at night, warn researchers.
The study, published in the journal Trends in Immunology, discusses how time of the day affects severity of afflictions, ranging from allergies to heart attacks. For example, studies showed that adaptive immune responses — in which highly specialised, pathogen-fighting cells develop over weeks — are under circadian control.
Researchers compiled studies, predominantly in mice, that looked at the connection between circadian rhythms and immune responses. “This is ‘striking’ and should have relevance for clinical applications, from transplants to vaccinations,” said study senior author Christoph Scheiermann, Professor at the University of Geneva in Switzerland.