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Papers referenced in the video:

Inter- and intraindividual variability in daily resting heart rate and its associations with age, sex, sleep, BMI, and time of year: Retrospective, longitudinal cohort study of 92,457 adults

https://pubmed.ncbi.nlm.nih.gov/32023264/

Heart rate variability with photoplethysmography in 8 million individuals: a cross-sectional study

https://pubmed.ncbi.nlm.nih.gov/33328029/