The Autonomic blog

Reading your nervous system, in plain language.

Field notes on HRV, POTS, dysautonomia and post-viral recovery, what the numbers mean, and how to turn them into better days.

Willian Justen de Vasconcellos / Unsplash
Austin Spaeth July 9, 2026 Basics

Autonomic BP Indices: Kérdő, Robinson & Kvas

Four derived indices squeeze extra meaning from a simple blood-pressure-plus-pulse reading. The Kérdő vegetative index reads autonomic balance (near zero is balanced, positive leans sympathetic, negative leans parasympathetic). The Robinson index (rate-pressure product) estimates the heart's workload. The Kvas index and BCE both gauge circulatory efficiency, where lower is better. None of these are routine clinical tests (they are older physiology formulas), so their real value is watching your own trend, not one number.

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The pillar guides: start here

A handful of deep guides that cover the core of reading and recovering your nervous system. Read them in order and you'll have the whole map.

  1. 01 The Autonomic Nervous System & Dysautonomia: A Complete Guide Your autonomic nervous system runs everything you never think about: heart rate, blood pressure, digestion, temperature. When it stops regulating properly, that's dysautonomia. Here is how it works, what goes wrong, and why it's measurable.
  2. 02 HRV: The Complete Guide to Reading Your Nervous System Heart rate variability is the single clearest at-home window into your autonomic nervous system. This is the complete guide: what RMSSD, SDNN, HF and LF actually mean, what moves them, how to measure well, and how to read the trend without spiraling.
  3. 03 POTS, Long COVID & MCAS: Why They Travel Together POTS, long COVID, ME/CFS and MCAS overlap so much that many people are told they have several at once. Here's what actually connects them, how they differ, and which parts of each you can track at home.
  4. 04 Recovery from Post-Viral Dysautonomia: Turning Data Into Decisions Recovery from POTS and post-viral dysautonomia is slow, noisy and non-linear, which is exactly why it's so easy to lose hope in the day-to-day. Here's how to pace, read your trends, and turn months of scattered data into decisions that actually bend the curve.
  5. 05 Autonomic: Measure, Analyze, Monitor, Act Everything about autonomic recovery comes down to one loop: measure what's happening, analyze the trend, monitor for warnings, and act. Autonomic is the app built to close that loop: private, offline, and scored against medical thresholds.

Heart Rate Variability

What HRV measures, why it falls in POTS and post-viral illness, and how to read RMSSD, SDNN and power without obsessing.

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Food & Diet

What to eat when your gut and nervous system are dysregulated: the POTS diet, low-histamine and MCAS eating, the SIBO gut connection, the Mediterranean pattern, and simple meal ideas for hard days.

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POTS & Dysautonomia

Practical guidance for postural orthostatic tachycardia syndrome and broader dysautonomia, from daily patterns to what actually moves recovery.

Open the POTS hub →

Long COVID, MCAS & Post-Viral

Long COVID, ME/CFS and MCAS overlap heavily with dysautonomia. What connects them, why they travel together, and how to track the parts you can measure.

Open the Long COVID hub →

Recovery

The long view, pacing, trends, milestones and turning months of data into decisions that bend your recovery the right way.

Open the Recovery hub →

Using Autonomic

How the Autonomic app works: scoring readings against medical thresholds, reading trends, and using AI to turn your data into doctor-ready summaries.

Open the app hub →

Research & News

Plain-language summaries of new research on HRV, POTS, long COVID and dysautonomia: what the studies actually found, and what it means for you.

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Basics

Start-here explainers, the core concepts and vocabulary behind reading your nervous system as a recovery instrument.

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Good to know

What is HRV, in one sentence?+

Heart rate variability is the tiny beat-to-beat variation in the time between your heartbeats, more variation usually means a more flexible, better-regulated nervous system.

Do I need special hardware to use any of this?+

No. You can log readings from a ring, chest strap, BP cuff or pulse oximeter, Autonomic scores whatever you record.

Is anything here medical advice?+

No. These are educational field notes to help you read your own data and have better conversations with your clinician, they do not diagnose or treat.

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Track your recovery with Autonomic

A private, offline journal that scores your daily HRV, BP and orthostatic readings against medical thresholds. Free to download, with $7.99/mo Pro when you want the deep-analysis tools.

Download on the App Store