Stress, Your Health, and Yoga

by Timothy

As I travel around the globe teaching workshops on yoga therapy—the use of yogic tools from postures to meditation to help people heal—I am struck by what an enormous problem stress-related illness is.  Everywhere I go, from ultra-modern cities like Stockholm where I've spent the last week, to less developed nations, people young and old are suffering the health consequences of their increasingly busy schedules and sometimes even busier minds.

Surprisingly, in this time of widespread tension, unrest and economic insecurity, most doctors still seem not to fully appreciate the deadly consequences of out-of-control stress or how much something like yoga can help. In medical school we were taught about the connection of stress to such health problems as duodenal ulcers, migraine headaches and irritable bowel syndrome. But scientific evidence is increasing indicating that stress can be a factor in life-threatening conditions from heart attacks to depression to hip fractures. Ironically, doctors may be among the most at-risk members of our society, due to their endemic stress and lack of understanding of simple non-drug tools like yoga that can fight it.

When scientists talk about the stress-response system, they are referring to a complex web of events that ramp the body up to deal with an acute crisis. The sympathetic nervous system—the so-called “fight or flight” system—kicks in, which among other things increases blood flow to the large muscles that help you defend yourself or run away from a physical threat. Stress hormones like adrenaline and cortisol are also released. In response, blood pressure and heart rate go up and breathing quickens. Blood sugar and other energy stores are mobilized to fuel whatever challenge you are about to face. In case you are injured, your blood begins to clot more easily. In crisis mode, the body shunts energy away from restorative functions like digestion and reproduction, mediated by the parasympathetic nervous system, which you can think of as the “rest and digest” system.

Arctic Landscape by Michele Macartney-Filgate

This built-in stress-response system is well-adapted to acute crises but can lead to all kinds of problems if it doesn’t gets switched off after the acute crisis passes. Blood clots increase the risk of a heart attack or a stroke, as does the high blood pressure and elevated blood lipids that stress contributes to. Elevated levels of cortisol are associated with everything from major depression to osteoporosis to overeating and weight gain (and the many problems that result from that). And while the immune system initially gets stronger during an acutely stressful event, it starts functioning less well if the stress goes on too long, raising the risk of serious infections and, as at least some evidence suggests, autoimmune diseases.

The problem is that the ancient human stress-response system isn’t so well adapted to mostly non-physical modern world stressors like work deadlines, traffic jams, and even abstract ideas about whether you are happy or fulfilled. If you repeatedly mull these problems over, the chemical and physical changes that were designed to deal with an acute threat to physical health—and which are then supposed to shut off when the threat is removed—remain activated. Such mental tape loops can thus turn abstract worries into concrete threats to health and even to life itself.

Yoga is arguably the best overall system of stress reduction ever invented. More and more evidence suggests the practice can help treat and prevent a wide range of health problems (for details see my web site). Beyond the harmful effects on the body, feeling stressed is a drag. It can make you feel anxious, preoccupied, full of dread.

Yoga can—sometimes within minutes—quiet down an overactive stress-response system. One of the great insights of the ancient yoga masters is that when you move and breathe with awareness, it calms your nervous system and slows down the tape loops in your mind. When your inner monologue slows, most people experience a sense of peace, relaxation and a feeling of being centered.

At first, this only happens when you are doing yoga and perhaps for a short time afterwards. But if you maintain a steady practice, more and more you become aware of and can tap into the tranquility you find in yoga throughout the rest of your day. Over time, you can actually make your nervous system less reactive to minor stressors, and less likely to get knocked off balance by life's inevitable ups and downs. You learn that you can be in a difficult situation, but nonetheless keep the breath slow and deep, and the mind both relaxed and attentive.

This sense of inner calm can make you feel more grateful for what you have, appreciate the beauty around you (which you otherwise might not have noticed) and help you realize that some of the stuff you're getting bent out of shape about may, ultimately, not be very important. And that may be one of the best stress reducers of all.

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?

CHRONIC STRESS: AN INTRODUCTION

by Nina

An ongoing theme that we’ll be exploring in depth on this blog is the negative effects of chronic stress on long-term health and the need for stress management as an important aspect of healthy aging. So perhaps it’s a good time for me to define exactly what we mean by “chronic stress” and to let you know a little about why it is such a serious problem.

I learned about dangers of chronic stress the hard way. Back in the early nineties, I had a job as the documentation manager and lead technical writer at a software start-up company, while at the same time I was raising two children. As you might imagine, the pressure was intense as our small company struggled to meet our first deadline, the first test of the product by real customers (who needed my manuals to teach them how to use the product!). As the deadline approached and I started working overtime, I began having difficulty sleeping. I also started losing weight because the stress made me so feel nauseated that I lost my appetite. Eventually I was so anxious, exhausted and nauseated that even though I met my deadline (and the company went on to success), I couldn’t bounce back to normal health. It took a year and half of therapy, medication, and lifestyle changes to recover completely.

Wounded Bird by Brad Gibson

Feeling stressed is not always a bad thing, however. It’s your body’s normal response to perceived danger or extreme physical activity (often called the “fight or flight response”), which is vital in keeping you safe and active. When you encounter a stressful situation, whether it is a grizzly bear or a stack of tax forms, your body releases hormones (adrenaline and noradrenaline) to provide you with the energy and alertness needed to cope with the situation. And anyone who has almost been run over an SUV knows the feeling: heart racing, rapid breathing, gut clenching. This is because in stress mode, your nervous system stimulates your organs and mobilizes energy by:

• raising your blood pressure
• increasing your heart rate and the blood supply to your skeletal muscles (and away from your gut)
• dilating your pupils and bronchioles, providing improved vision and oxygenation
• generating needed energy by breaking down sugar and fat stores for immediate use

Between stressful situations, your body needs to rest, recover, and acquire new energy, so your nervous system responds by:

• lowering your blood pressure
• reducing your heart rate, diverting blood back to the skin and gastrointestinal tract
• contracting your pupils and your bronchioles for reduced oxygenation
• stimulating your salivary gland secretion, accelerating digestion, and promoting normal movement of food through the gut

But what if the stress is long term? When you almost get hit by a car, escape from a bear or finish your taxes, the incident is over quickly and you bounce back to normal soon after. But if the stress is ongoing or “chronic,” maybe because of continuing job pressures (like mine at the software company), marriage problems, health problems, and so on, your nervous system is continuously on the alert and this can overtax your body potentially causing:

• heart disease
• hypertension (high blood pressure)
• insomnia and/or fatigue
• digestive disorders
• headaches
• chronic anxiety or depression
• weakened immune system

(Hmm, I just counted, and it seems I developed almost half of those symptoms, rather impressive in a weird sort of way.)

Of course, these symptoms are not only unpleasant but will seriously compromise your long-term health if you can’t manage to bring them under control. In addition, several age-related diseases, such as Alzheimer’s, Parkinson’s, and Diabetes are exacerbated by stress, and some theories of aging itself (such as the telomere theory I discussed last week) propose stress as a factor in the aging process itself.

I hope you’re not getting too stressed out by reading all of this! I credit yoga with helping me stay well since that breakdown. And in the coming weeks, we’ll be offering many different alternatives for managing your stress even as you take on the many challenges that life has to offer.