Heart rate, lifespan, and mortality risk.
Level 5 - mechanism / opinion, no new human data
Narrative review of cross-species and observational human data with no systematic search methodology
PubMed 19022405 · doi:10.1016/j.arr.2008.10.001
What was done
This narrative review synthesized cross-species comparative biology and human observational studies to evaluate the relationship between resting heart rate, basal metabolic rate, biological aging mechanisms (such as oxidation, inflammation, and telomere shortening), and lifespan.
What was found
The abstract provides no quantitative data, odds ratios, or hazard ratios. It reports qualitatively that resting heart rate is inversely correlated with lifespan across homeothermic mammals and that higher resting heart rate is universally linked to increased mortality risk in human cohort stratification.
Why it matters
The paper frames resting heart rate not merely as a cardiovascular risk marker but as a potential biological constraint on maximum longevity that warrants investigation as a therapeutic target for cardiac slowing.
Limits
The abstract describes a non-systematic narrative review providing no primary human data, pooled effect sizes, or confidence intervals. The observed associations between heart rate and lifespan do not establish causality, and potential confounding variables are not quantified.