What is HRV?
Heart rate variability — HRV — is the variation in time between consecutive heartbeats. A healthy heart does not beat like a metronome. It speeds up and slows down subtly based on breath, stress, movement, and recovery. More variation is generally better.
HRV is one of the most validated real-time indicators of autonomic nervous system function. It's used in elite sport, clinical cardiology, burnout research, and increasingly in consumer wearables (Oura, Whoop, Apple Watch).
What your HRV tells you
- High HRV — your nervous system is adaptable. You can mobilize when needed and recover when safe.
- Low HRV — your nervous system is stuck. Often associated with chronic stress, poor sleep, illness, overtraining, or systemic inflammation.
- Declining trend — something is taxing you more than you're recovering from.
- Rising trend — you're adapting well to the load on your life.
Absolute numbers vary by person, age, and device. Trends over time matter more than any single reading.
What drives low HRV
- Chronic sleep debt
- Ongoing emotional stress (work, caregiving, grief)
- Unresolved illness or inflammation
- Alcohol and late-night eating
- Over-scheduling and under-recovering
- Sympathetic-dominant posture patterns (desk work, hunched nursing, compensation from old injuries)
- Subluxation patterns that disrupt vagal tone
How chiropractic care supports HRV
Gentle spinal adjustments — especially at the upper cervical spine and sacrum, where vagal and parasympathetic outflow are most concentrated — have been associated in clinical observation with upward HRV trends after care.
At Fika, we measure HRV at every exam and every rescan using our INSiGHT neuroPULSE sensor. That means we don't guess whether your nervous system is trending in the right direction — we show you the data.
Building HRV at home
Things that reliably help HRV over weeks to months:
- Consistent sleep and wake times
- Slow nasal breath practice — especially 4-7-8 - 4 second inhale, 7 second hold, 8 second exhale. Do this for 10–15 minutes daily
- Daylight exposure within an hour of waking
- Zone 2 aerobic training — easy walking, cycling, or running most days
- Limiting alcohol, especially close to bedtime
- Reducing late-night eating
- Meaningful social connection
A note on wearables
Wearable HRV data is useful for trend tracking, but it's measured under different conditions than a clinical scan. We treat them as complementary: your wearable tracks recovery day-to-day; our INSiGHT scans measure in a standardized clinical posture so your numbers are comparable across months.