Time of Day as a Biological Variable in Cardiovascular and Kidney Disease Research: A Scientific Statement From the American Heart Association.
Level 5 - mechanism / opinion, no new human data
AHA scientific statement and narrative review without new human data or systematic synthesis
PubMed 42619612 · doi:10.1161/ATV.0000000000000198
What was done
This American Heart Association scientific statement reviewed time of day and endogenous circadian rhythms as biological variables in cardiovascular and kidney disease research, focusing on molecular clock mechanisms and experimental design considerations across basic and clinical science.
What was found
The abstract reports no quantitative data or numerical outcomes. It highlights that cardiovascular and renal systems function in a circadian fashion from gene expression to functional outputs, and emphasizes a translational mismatch where rodent experiments typically occur during daytime rest phases while human testing occurs during active phases.
Why it matters
It provides formal scientific guidance urging researchers to account for time of day to strengthen experimental rigor and bridge discrepancies between nocturnal animal models and diurnal human physiology.
Limits
This is a narrative consensus statement rather than an empirical study or systematic review. The abstract provides no original clinical trial data, sample sizes, or quantitative effect sizes.
Cited by
- supports Every cell in the human body contains internal circadian clocks.