Humming vs Slow Breathing for the Vagus Nerve

I get asked about the humming vagus nerve connection more than you’d think.

It usually sounds like this: “Jesse, does humming stimulate the vagus nerve, and is it better than slow breathing?”

I like the question, because it’s practical. People want a tool they can use in real life. And humming feels almost too easy to count as a “technique,” which is exactly why it’s worth looking at the data.

Let’s talk about what a physiology study actually found when it put humming breath up against slow-paced breathing, and what that does (and does not) mean for humming for anxiety.

First, what do people mean by “humming vagus nerve”

When most people say “humming stimulates the vagus nerve,” they’re usually pointing at one of these ideas:

• Humming feels calming, so it must be vagal.

• Humming changes HRV, and HRV gets talked about as “vagal tone.”

• Humming creates vibration in the throat, face, and chest, and that feels like a nervous system “reset.”

Here’s the cleaner way to say it:

• The vagus nerve is a major player in parasympathetic regulation, including heart function.

• Parts of HRV (especially high-frequency HRV) are commonly used as an indirect window into vagal activity, but HRV is not a direct vagus nerve measurement.

So yes, humming for anxiety can make sense as a calming practice. But I’m always careful with the wording. You’re influencing physiology through breath patterns and exhale length, and maybe vibration, not “zapping” a nerve like a device would.

The 2025 physiology study: humming vs slow-paced breathing

This is the study people are referencing in the “humming vs slow breathing” conversation:

Woo & Kim (2025), Physiology & Behavior.

What they tested

They brought in 16 healthy adults and measured HRV for five minutes in three conditions:

1. Rest
   

2. Slow-paced breathing with a 5-second inhale and a 5-second exhale (paced using the EliteHRV app)
   

3. Humming breathing (Bhramari pranayama)

They also used a Visual Analogue Scale to rate:

• anxiety

• stress

• relaxation

• confidence

…across baseline, rest, slow breathing, and humming.

What they found

Both slow-paced breathing and humming breathing increased HRV compared to rest, and both improved relaxation ratings compared to baseline.

And here’s the key point:

There were no significant differences between humming and slow-paced breathing for HRV outcomes or the self-report ratings.

What “HRV improved” means in this study

The study reported increases in HRV markers, including:

• SDNN (variability in beat-to-beat intervals)

• Total Power

• Low Frequency (LF)

…during both slow breathing and humming compared to rest.

If you’ve spent time around HRV conversations, you’ve probably noticed people argue about LF, HF, and what each “means.” Fair. HRV interpretation can get messy fast.

What I take from this paper is simpler:

• These breathing patterns increased overall variability and were associated with greater relaxation in the moment.

• Humming did not require a pacing app and still performed similarly.

Also worth noting: slow breathing has a long history of showing HRV benefits, especially around slower rates near ~6 breaths per minute in many contexts.

So, humming matching, it is nothing.

Does humming stimulate the vagus nerve? What this study can and cannot say

This is the part where I slow everyone down a little.

What the study supports

• Humming breath can improve HRV markers and subjective relaxation similarly to slow-paced breathing in healthy adults.

What the study does not prove

• It does not directly measure vagus nerve firing.

• It does not prove that humming is “better for anxiety” than slow breathing.

• It does not tell us how this works in clinical anxiety populations (this was a small pilot with healthy participants).

So if your goal is “vagus nerve stimulation,” the honest statement is:

Humming may support parasympathetic leaning physiology (as indirectly reflected by HRV changes), but calling it direct vagus nerve stimulation is more marketing than measurement.

Why humming might feel different than slow breathing

Even if the numbers look similar, people experience these practices differently. That matters because the best technique is the one you will actually do.

Here are a few reasons humming can feel uniquely calming:

1) It lengthens the exhale without you overthinking it

A lot of people struggle to “do slow breathing right.” Humming naturally slows your exhale because you need time to sustain the sound.

2) It adds gentle vibration and auditory feedback

The sound gives your brain something to track. You’re not just counting seconds and wondering if you’re doing it wrong.

3) It can increase nasal nitric oxide during humming

There’s classic research showing nasal nitric oxide rises dramatically during humming compared to quiet exhalation.

That doesn’t automatically mean “less anxiety,” but it’s a real physiological difference that makes humming interesting beyond vibe and folklore.

Humming breath vs slow breathing: quick comparison

Feature	Humming breath (Bhramari style)	Slow-paced breathing (paced 5 in, 5 out)
Tools needed	None	Often easier with a timer or pacing app
What the 2025 study showed	Increased HRV and relaxation vs rest	Increased HRV and relaxation vs rest
Difference between them	No meaningful difference in HRV or ratings	Same
What it feels like	More sensory, less “technical”	Structured, clean, measurable
Best use case	When you want calming without screens	When you like structure and pacing

How I recommend using humming for anxiety

If you’re trying humming for anxiety relief, keep it simple and repeatable.

Two-minute starter (easy to commit to)

1. Inhale through the nose
   

2. Exhale slowly while humming at a comfortable pitch
   

3. Keep the throat and jaw soft
   

4. Repeat for 2 minutes

Five-minute session (closer to what studies often test)

• Set a timer for 5 minutes

• Each exhale is a hum

• Let the inhale be quiet and unforced

• If you feel lightheaded, back off on intensity and return to normal breathing

The goal is “settle the system,” not “do the technique perfectly.”

What to watch for

• If humming makes you self-conscious, do it quietly with lips closed. Even a low hum counts.

• If you’re congested, try slow breathing instead. Humming can feel irritating when your sinuses are inflamed.

• If you’re already agitated, humming can sometimes work better than paced breathing because it gives your attention a sensory anchor.

FAQ

Does humming stimulate the vagus nerve?

Humming may influence autonomic balance and relaxation, and HRV is often used as an indirect marker related to parasympathetic activity. But HRV is not a direct vagus nerve measurement. A 2025 pilot study found humming breathing improved HRV and relaxation similarly to slow-paced breathing in healthy adults.

Is humming for anxiety actually evidence-based?

There is some evidence that humming-style breathing can improve HRV measures and subjective relaxation, at least acutely in small studies. The 2025 Physiology & Behavior pilot found that humming and slow-paced breathing both improved HRV compared to rest, with no meaningful difference between the two.

What is humming breath, exactly?

“Humming breath” usually means breathing with a relaxed inhale and a slow exhale, where you hum (often similar to Bhramari pranayama). In the 2025 study, the humming condition was Bhramari style humming breathing performed for five minutes, compared against paced slow breathing and rest.

Which is better: humming or slow breathing?

Based on the 2025 pilot study, neither clearly wins. Both increased HRV markers and improved relaxation ratings compared to baseline, and there were no significant differences between them. In practice, choose the one you can stick with and that feels easiest to do consistently.

My take

If you’ve been chasing the perfect vagus nerve trick, here’s the grounded answer:

You don’t need a perfect trick. You need a reliable practice.

This physiology study basically gives you permission to pick your lane. If paced slow breathing feels clean and steady, use it. If humming breath feels more natural and easier to repeat without an app, use that. Either way, you’re training in the same direction: less frantic respiration, more regulation, and better control over how you respond to stress.

If you want my full framework for building breathwork into training, recovery, and daily nervous system hygiene (without gimmicks), I teach it inside my certification.