Your Key to Your Nervous System: Your Breath

by Nina

Have you ever wondered why you tend to yawn when you’re sleepy? Well, a yawn is a great big inhalation. And because your heart rate tends to speed up on your inhalation, that yawn in the middle of that boring lecture or business meeting is little message to your nervous system: wake up! On the other hand, when you are upset about something, you tend to sigh. That sigh—try one!—is an extra long exhalation. Because your heart rate tends to slow on your exhalation, that sigh while you are feeling emotional turmoil or are just stuck in traffic is a little message to your nervous system: take it easy, buddy, slow down a bit.

Your autonomic nervous system is the part of your nervous system that controls the functions of your body, such as digestion, heartbeat, blood pressure, and breathing, that are “involuntary,” meaning the functions that you don’t have to think about. The autonomic nervous system is also the part of your nervous system that sends you into stress mode (fight or flight) and that triggers the relaxation response. And while you cannot tell your nervous system directly to slow your heart beat, digest your food more quickly (that would be nice, wouldn’t it?), or to start relaxing right this minute, you can control your breath.

Think about it: even though you breathe without thinking about it, you can intentionally hold your breath, speed up your breath, slow down your breath, breathe through one nostril instead of the other, and so on. And this ability to alter your breathing is what gives you the key to your nervous system, providing you with some control over its “involuntary” functions.

Tide Under First Bridge by Brad Gibson

In my post on the stress response (see "Chronic Stress: An Introduction"), I mentioned that in stress mode your body uses more oxygen (for fighting or fleeing) while in relaxation mode your body needs less oxygen (for resting and digesting). It turns out that by intentionally taking in more oxygen (either by speeding up your breath or by lengthening your inhalation) you can stimulate your nervous system and that by taking in less oxygen (by slowing your breath or lengthening your exhalation), you can calm yourself down. It’s that simple. (See "Stress Test" for my example of using breath practice to stay calm during oral surgery.)

Yogic breath practices have evolved over thousands of years as yogis experimented on themselves and passed on their discoveries their students. And while some schools of yoga teach yogic breath practices (pranayama) to beginners, the type of yoga that I’m trained in, Iyengar style, considers breath practices to be so powerful that pranayama is introduced very gradually.

We’ll be introducing some simple breath practices in the coming weeks, but until then start by tuning into your breath throughout the day. When you’re standing in a long line at the post office, fighting the crowds at the grocery store, or are stuck in traffic, are you taking quick breaths, deep breaths or sighing? When you’re taking a hot bubble bath, petting your dog, or chatting with your partner after a good dinner, are you taking slow breaths, shallow breaths, or—oops!—yawning?