Latest field notes
Learn Longevity Through Science
Latest research and practical guides on HRV, recovery, and aging.
Biological Age: The "Speed of Aging" Found in 210,000 Wrists
The sensor that measures your HRV also knows how fast you are aging. The secrets of biological age revealed by data from 210,000 people.
Aging and HRV: Reading Your Biological Age
HRV knows your real age. From mortality studies to longevity strategies.
Alcohol and HRV: The Science of One Drink
How alcohol affects your heart and sleep. The uncomfortable truth the data reveals, and practical strategies to cope.
The Anatomy of Anxiety: Signals from a Worried Body
HRV patterns by anxiety disorder type, the physiology of the worry loop, and real-time coping techniques you can use now.
The Science of Breathing: What 5 Seconds Can Change
The secret of 6 breaths per minute. The most powerful HRV improvement method, proven by 223 studies.
The Anatomy of Burnout: Your Body Knows Before You Do
Burnout doesn't strike overnight. How HRV reveals your body's warning signs and the science of recovery.
The HRV Bible: Learning to Read Your Heart's Language
From the science of heart rate variability to practical biohacking. The complete guide to reading your body's most honest signal.
The Runner's HRV: Training with Data
How to decide training intensity based on morning HRV. The methods elite athletes use are now available to you.
The Science of Sleep: Signals from Your Sleeping Body
How does HRV change during sleep? The secret of 2 AM, patterns of insomnia, and the science of truly restful sleep.
Women and HRV: Reading Your Cycle
How does HRV change throughout your menstrual cycle? A data guide to understanding the female body.