Anuloma Viloma TimerSunday is World Hypertension Day. The piece that gets shared on Sunday will be about a clinical trial in patients who were already on blood pressure medication. This piece is about the person earlier in the funnel: someone who has never done a breathing practice, is not on medication yet, and is asking the most reasonable question in the world. Will this actually do anything for me?
A 2025 study answered that question with an ECG.
The Study
In 2025, Niharika Punia and colleagues published “Exploring the Immediate Effects of Nadi Shuddhi Pranayama on Heart Rate Variability Among Young Adults” in Applied Psychophysiology and Biofeedback (Springer). The paper is open access on PubMed Central as PMC12331837. The full citation: Appl Psychophysiol Biofeedback (2025), DOI 10.1007/s10484-025-09710-4.
The recruitment criterion was specific. Forty participants between 20 and 40 years old. All had to be naive to pranayama. The point of the study was to measure what happens the first time, in people who had no prior practice to fall back on.
The protocol was three blocks: fifteen minutes of supine ECG baseline, fifteen minutes of guided Nadi Shuddhi Pranayama (the formal Sanskrit name for what most people call Anulom-Vilom or alternate nostril breathing), and fifteen minutes of supine ECG recovery. The same person, on the same morning, measured before and after the same single session.
What The ECG Showed
The autonomic nervous system has two branches. Sympathetic is the gas pedal. Parasympathetic is the brake. Healthy resting state is brake-dominant. Stress shifts the balance toward the gas pedal. The relative weight of the two branches can be read off the ECG using standard heart rate variability measures.
In the recovery block, after the single fifteen-minute session, the participants showed three things at once. SDNN (total HRV) rose significantly. LF (sympathetic drive) fell significantly. HF (parasympathetic engagement and vagal tone) rose significantly. Systolic blood pressure came down.
That is the single session moving the needle on every one of those measures at statistical significance, in forty people who had never tried pranayama before.
Why This One
There are bigger studies of pranayama. The Mittal trial from 2025 (PMC11996816) is a six-week randomised trial in hypertensive patients already on medication. That is Sunday’s piece. Their numbers went further down with daily practice.
The Punia study sits earlier in the funnel. Single session, no clinical selection, no prior experience, measured before and after fifteen minutes in a lab. Does anything measurable happen the first time?
The answer is yes. SDNN, LF, HF, and systolic BP all move in the direction that maps to “more parasympathetic, less sympathetic, calmer cardiovascular tone.” The shift was not contingent on the person liking the practice. It was contingent on the person doing it.
What The Practice Is
Sit upright. Close the right nostril with the right thumb, inhale slowly through the left. Close the left with the ring finger, release the thumb, exhale through the right. Inhale right, close right, release left, exhale left. That is one round.
A beginner round is thirty to forty seconds. Twenty rounds is ten to fifteen minutes. Slow, comfortable, even. No forcing, no breath-holding required at this level. The Punia protocol was fifteen guided minutes of exactly this.
What It Means If You Have Never Tried This
The Punia study asked the simplest question. Does anything measurable happen the first time. It does. SDNN up. LF down. HF up. Systolic BP down.
The design is the experiment you would run on yourself. Take a baseline. Sit down, set a timer, do one fifteen-minute session. Take another reading. Compare.
You need fifteen minutes, a timer that handles the alternation so you can close your eyes, and any baseline measure (home BP cuff, a heart-rate sensor on a watch you already own, or your honest sense of before-and-after). The timer version we make is free. Anuloma Viloma Timer is on the App Store. No subscription necessary.
Notes on Limitations
The Punia study measured young adults aged 20 to 40 in a lab. It is acute physiology in a relatively healthy population. It does not establish dose-response and is not a clinical trial in diagnosed hypertensives. It answers one narrow question well: when a typical person without prior practice tries this once, this is what is measurable afterward. For the chronic-condition question, Sunday’s piece on the Mittal trial covers it.
The Two-Sentence Version
You do not have to be sick for this to work. You do not have to have practised before. The 2025 Springer paper measured the autonomic shift on the first try.
Anuloma Viloma Timer is free on the App Store. No subscription necessary.