Blood Test #2 by 2022: Cardiovascular Fitness Metrics and Supplements (HRV,RHR)
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This link to my website contains Levine’s Biological Age Calculator as an Excel document.
The video includes references to papers:
Retrospective longitudinal cohort study on 92 457 adults.
https://pubmed.ncbi.nlm.nih.gov/32023264/
Photoplethysmography of heart rate variability in 8 million people: A cross-sectional analysis.
https://pubmed.ncbi.nlm.nih.gov/33328029/
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