Heart & nervous system
Understand what your heart rate, rhythm, and recovery reveal about your health — and what keeps your heart and nervous system resilient.
Most read
August 11, 2026
What is a good HRV? An HRV chart by age and sex, and how to read your own number
There's no single good HRV number — it depends on your age, sex, and above all your own baseline. Rough RMSSD ranges by age, why comparing to others is meaningless, and how to actually tell if your HRV is healthy: your baseline and your trend.
August 11, 2026
Why is my HRV so low? What a low heart rate variability actually means
A low HRV usually means your body is under stress or not recovering well — from poor sleep, alcohol, hard training, illness, or stress. What it means, the common causes, a normal dip vs a chronic low, and when it's worth checking.
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Latest articles
Atrial fibrillation (AFib): what it is, symptoms, stroke risk, and when to see a doctor
August 21, 2026
Exertional dyspnea: why you get short of breath on exertion — from deconditioning to the signals that matter
August 18, 2026
Why are my hands always cold? Five causes on the spectrum from normal to worth checking
August 18, 2026
Why is my heart racing at night? What a pounding heart at bedtime actually means
August 18, 2026
Heart rate variability meaning: what HRV measures and what it doesn’t
August 16, 2026
Heart rate variability: what HRV measures, what affects it, and how to read your numbers
August 16, 2026
How medications change your heart rate zones
August 12, 2026
HRV during sleep: why it's measured overnight and what it reveals about your recovery
August 11, 2026
Why does my HRV change so much day to day? (And when to actually worry)
August 11, 2026
What is a good HRV? An HRV chart by age and sex, and how to read your own number
August 11, 2026
Why is my HRV so low? What a low heart rate variability actually means
August 11, 2026
How to improve your HRV: what actually works, and how long it takes
August 11, 2026
Low resting heart rate: athlete's heart or something to worry about? How to tell
August 10, 2026
Why is my resting heart rate so high? The real causes, when to worry, and how to bring it down
August 10, 2026
What is a normal resting heart rate? The real range, by age and fitness — and how to read your own
August 10, 2026
Vagus nerve exercises: 7 that actually shift vagal tone (and the ones that just sound good)
August 6, 2026
What is the vagus nerve? How vagal tone, your parasympathetic system, and HRV actually connect
August 6, 2026
HRV by age: normal ranges by decade, why it declines, and how to read yours
August 1, 2026
What causes arrhythmias and heart palpitations? Triggers, underlying conditions, and when to worry
July 24, 2026
Heart arrhythmia and palpitations: what a racing, fluttering, or irregular heartbeat means — and when it's dangerous
July 24, 2026