sympathetic tone — Blog — The Breathing Diabetic

Happy Monday to you! Welcome to a new edition of The Breathing 4.1.1.

Below you’ll find 4 thoughts, 1 quote, and 1 answer (think "Jeopardy"). Enjoy!

4 THOUGHTS

1. Breath Rate or Breath Control: Which is More Important?

Last week, we talked about a powerful evolutionary advantage: Rather than evolving to breathe slowly, we evolved the ability to control our breathing.

We know slow, controlled breathing is beneficial, but what about just the controlled aspect itself?

A study published in 2017 examined this by having participants perform controlled breathing at 12 breaths per minute. This rate is on the low end of average for spontaneous breathing.

They found that this practice reduced sympathetic activity. There was something about the act of consciously controlling the breath that helped promote autonomic balance, despite the rather ordinary rate.

Slow breathing provides a host of additional benefits. But let us not forget the power of simply controlling your body’s most important function: breathing.

2. While We’re on the Subject: Slow Breathing Restores Balance in COPD

People with COPD have similar complications to diabetics, such as increased sympathetic tone and reduced baroreflex sensitivity (BRS).

A study published in 2008 found that slow breathing at 6 breaths per minute for 4 minutes significantly reduced sympathetic activity and increased BRS in COPD patients. That is, it helped restore cardio-autonomic balance. 

Their words are always better than mine:

“In summary, patients with chronic obstructive pulmonary disease showed sympathetic excitation and depression of the baroreflex. Slow breathing counteracted these changes.” - Raupach et al.

3. Another Non-Breathing Tip: I Take This Every Morning

To build off of my #1 non-breathing tip (2-4 hours between dinner and bedtime), here’s another one I use every day: baking soda.

Baking soda has been shown to improve performance and even help with autoimmune conditions. From a breathing perspective, it has also been shown to increase breath-hold time (something I have anecdotally experienced).

Here’s how I take it every morning:

2 tablespoons of apple cider vinegar
1/2 teaspoon of baking soda
Mix and "enjoy"

It sounds disgusting, but it’s actually not too bad. Apple cider vinegar might also help control blood sugars, so that’s an added bonus for us diabetics.

4. A Race for the Future

"Looking at the evidence, it’s hard not to conclude that our entire physiology was engineered to reward us for moving." - Kelly McGonigal, The Joy of Movement

I love Physiology First, its mission, and the people behind it. On August 15, they are holding a run/walk to collectively cover 1,000 miles. You can join virtually anywhere (my wife and I will be joining from here on the Space Coast of Florida).

It’s been a while since my 100-mile ruck, so this is a great reason to get out and move for a good cause. Every mile helps, and there is no minimum. I hope to "e-see" you there!

More Details:

A RACE FOR THE FUTURE
(We’re signing up for the "1000 Miler")

1 QUOTE

Speaking of walking and breathing:

“We should take wandering outdoor walks, so that the mind might be nourished and refreshed by the open air and deep breathing.” —Seneca, On Tranquility of Mind

(I found this quote in Ryan Holiday’s Newsletter.)

1 ANSWER

Answer: The number of oxygen molecules in each red blood cell.

…

(Cue the Jeopardy music.)

…

Question: What is 1 billion?

In good breath,
Nick

P.S. Keeping Cool During COVID.

In post-traumatic stress disorder (PTSD), physiological arousal is increased when a person is reminded of their traumatic experience. This is somewhat unsurprising.

An over activated sympathetic nervous system almost certainly plays a role in this. However, under activation of the parasympathetic nervous system, or “low vagal tone,” might be equally important.

The goal of the paper I’m sharing this week was to examine these two components and determine which might be responsible for the enhanced stress response in PTSD.

As with most things, the answer is likely “they both matter.” But here is what they found.

Low Heart Rate Variability Linked to Enhanced Stress Response

(Read the Full Summary Here)

They measured high-frequency heart rate variability (HRV) as a marker of parasympathetic tone. Then, the participants were read a trauma script and their physiological response was recorded.

Results showed that patients with a higher baseline HRV did not experience as much stress. The subjects with lower HRV showed a higher heart rate peak, followed by a slower deceleration of heart rate. That is, they showed an elevated stress response.

The patients with lower baseline HRV also had longer half-recovery times, meaning that their stress response was not only elevated, but also prolonged.

These findings suggest that low parasympathetic tone, rather than just increased sympathetic activity, might help explain the increased physiological stress response in PTSD.

Two Takeaways

HRV measurements might provide insight into the severity of a person’s PTSD and predict how well they respond to stress.
Slow breathing is one of the easiest ways to improve HRV, both immediately and long term.

If HRV predicts the stress response, and HRV can be increased via breathing exercises, it is conceivable that breathing practices could improve stress resiliency in PTSD. (In fact, a 2013 study found that a yoga breathing program significantly improves PTSD symptoms in Australian Vietnam veterans.)

Finally (and importantly), these takeaways might be applicable to conditions other than PTSD, such as anxiety disorder, cardiovascular disease, and diabetes.