Coming into Balance: How Stress and Relaxation Work Together

by Baxter and Nina

Mirror Image by Melina Meza

So, you’re lying on a beautiful beach somewhere, feeling the warmth of the sun on your skin and listening to the sound of waves lapping at the shore, and you’re feeling totally comfortable and very relaxed. So what is happening to you? Is this the relaxation response? The rest and digest state? Conscious relaxation? Or what?

Another time you’re sitting alone in your house, meditating on your breath. Your knee hurts a bit. Your thoughts seem wild, and you feel fidgety and restless. But you keep coming back to your breath, and after several minutes your mind begins to settle and quiet. What’s happening to you now? And how is this different than being on the beach?

Or, let’s say one night you’re driving your car down a dark, winding road through a forest when suddenly a deer bolts into the road. Your heart begins to pound and your breath speeds up as you quickly try to take evasive action. Is this the stress response? The Fight or Flight response? On another night, you’re meeting someone you’ve just started dating. When you spot them on the street coming toward you, your heart begins to pound and your breath speeds up. It feels kind of like stress, but in a good way—you know, exciting. What’s going on there?

As we have been delving into the topics of stress and relaxation, we’ve found there’s some confusing terminology out there in the literature and even here on our own blog! So it seems like a good idea to try and define once and for all some of terms that have been most commonly bantered about. To start, let’s take a look at the following terms to get clearer on what they mean:

1. Stress Response
2. Fight or Flight State
3. Relaxation Response
4. Rest and Digest State
5. Conscious Relaxation

Stress Response. This term describes the response of your mind and body response of your mind and body when you are faced with a challenge. Sometimes the response is to a real or perceived threat, ranging from serious life or death situations to stressful situations like doing your taxes or getting lost. Other times the response is to a positive challenge, such as running a race, falling in love, brainstorming ideas, or creating a work of art. The stress response increases the activity of your sympathetic nervous system, speeding up your heart and breath rates, and dilating your pupils to get you ready for action. When the stress response is at its extreme, you shift into the Flight or Fight State.

Fight or Flight State. This term describes the state of your nervous system when your sympathetic system is fully operational, and generally you actually are in danger, threatened, or think you are in danger. For example, if you are about to get into a car accident, your nervous system sends quick signals to your adrenal glands to release adrenalin, unleashing a rapid physical response evolved to get you to safety. (See below for details.) 

Relaxation Response. This term describes the response of your mind and body to safe circumstances or a secure environment, causing your heart and breath rate to slow, your blood pressure to drop, your energy usage to slow and your digestion and immune systems to turn on. In our above example, if you successfully avoided the car crash, once you got home and had some time to decompress, your system would slowly shift to the relaxation response. The relaxation response increases the activity of your parasympathetic nervous system, and enters you into the Rest and Digest state. 

You can trigger the relaxation response through conscious relaxation techniques or just by ordinary resting and relaxing while you are awake, such as by listening to calming music on your couch or by lying on a beach feeling the sun on your skin and listening to the waves. (This is in contrast to activities that are distracting rather than relaxing. For example, while TV distracts us from our real-life concerns, it is not actually relaxing your nervous system because the action you’re watching is typically very stimulating—as anyone who tries to go to bed after a scary movie or violent show soon realizes.)

Rest and Digest State. This term describes the state of your nervous system when your parasympathetic system is fully operational, you are mentally and physically relaxed, your body’s vital signs are in their calm state, and the immune, repair, and digestive systems are up and operating. You enter this state naturally when relaxing at home or out in nature, or when you use conscious relaxation to trigger the relaxation response.

Conscious Relaxation. This term describes any technique that triggers the relaxation response, including meditation, breath practices that are calming, guided relaxation practices, and even gentle and restorative yoga asana practiced mindfully. Keep in mind that this describes an active practice technique with a desired goal. But the awesome thing about conscious relaxation is that you can use it anytime and anywhere. You don’t need to fly to Hawaii. And although a quiet peaceful environment is helpful, you can even meditate or do breath practices in challenging environments. (See 6 Ways to Bust Stress with Yoga).

The Healthy Balance of Stress and Relaxation

So let’s say you’re sitting outside in the garden talking with a friend, and you’re feeling very comfortable and relaxed. Then your friend tells you about an interesting idea he has, and you suddenly perk up a bit. You then pitch in with an idea of your own, and that leads to very animated discussion. What’s happening here? Are you relaxed or stressed? Or, is it possible that you are both at the same?

Ding, ding, ding! Yes, it’s both at the same time. As we described in Chapter x, your autonomic nervous system, which controls background processes that keep your body alive and healthy, such breathing, maintaining normal temperature, and adjusting blood pressure to match activity, is divided into two subsystems: your sympathetic nervous system and your parasympathetic nervous system. And these two subsystems work together in tandem, providing you with a healthy balance of activity and relaxation. 

Sympathetic Nervous System. This system stimulates you when you need to be active. The activity can be as basic as getting out of bed in the morning, writing an email, or practicing gentle yoga poses, something more challenging such as running a race or giving a public talk, or something really drastic such as trying to avoid a car accident. 

Your sympathetic nervous system prepares your body and mind for action by stimulating your heart to beat faster and stronger and slightly raising your blood pressure to improve blood flow, by opening your airways so you can breathe more easily, and by stimulating your thought processes so you can assess your situation and think more quickly.

In extreme situations—where serious action on your part is needed—your sympathetic nervous system triggers the Fight or Flight response, as described above. In this state, your sympathetic nervous system actually turns off the background functions of nourishment, restoration, and healing that are provided by the parasympathetic nervous system because these functions will slow you down. Being in the Fight or Flight state is normal and healthy as long as it doesn’t happen too frequently or continue for a long period of time, when it becomes chronic stress (see see About Stress: Acute Versus Chronic).

Parasympathetic Nervous System. This system is responsible for nourishing, restoring, and healing your body and mind. As you move through your day, whether you are totally relaxed, slightly active, or even very active, your parasympathetic nervous system stimulates digestion, activates various metabolic processes, and keeps your immune system turned on. (These functions will only be turned off temporarily when you’re in a Fight or Flight state.)

When you are physically still and your mind is quiet, your parasympathetic system functions optimally, allowing you to enter the Rest and Digest state. Being in the Rest and Digest state is normal and very desirable, as it gives your body and mind time to relax completely and recover from stressful periods. There’s probably no downside to spending a lot of time in this state, except you probably wouldn’t get very much done!

On an average good day, when you’re feeling rested and cheerful, and are involved in normal work and social activities, your sympathetic and parasympathetic systems work together to keep you in balance, allowing you to be both fully functional and stay healthy. A well-balanced yoga practice, including both physical exercise and stress management practices, will help you maintain this balance when there are minor challenges in your life. It is only when you spend too much time with an overactive sympathetic nervous system due to ongoing stressful life circumstances that you can become out of balance. At this point, it’s very important to take steps to reduce your chronic stress and bring yourself back into balance again, as chronic stress is harmful to your physical, emotional, and mental health (see About Stress: Acute Versus Chronic). And conscious relaxation with yoga is the way!

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Friday Q&A: Baxter, Are Backbends and Flow Sequences Stimulating or Relaxing?

Judi Friedman, Age 52, photographed by Robert Sturman

Q: Nina asked me what I thought about the recent conversation that she and Ram had via email (see Are Backbends Stimulating or Relaxing?) and I couldn’t help but chime in! So here is what I, Baxter, have to say about the effect of more intense poses and practices on the response of the Autonomic Nervous System and therefore on vagal tone:

A: Nina, I agree with your anecdotal observations as well as your theoretical ponderings (and on a few things, with Ram, too). And my reasons are multiple: 

1. Some students are going to be more challenged by advanced back bends and aerobic flow classes due to a) musculoskeletal issues that make backbends harder for their bodies to do, and b)aerobic fitness levels that are not equal to the intensity of the flow class they are taking. These situations are going to trigger the Sympathetic Nervous System (SNS) branch of the Autonomic Nervous System. 
2. All the other reasons Ram mentions could contribute to increased stress response in a person, thus triggering the Fight or Flight response of the SNS too. And, of course, I agree with his initial statement of the underlying goals of yoga. 
3. As you postulate, abnormal breathing patterns, such as restricted breath in backbends or the tendency to inhale and hold the breath momentarily when doing difficult or unfamiliar poses could also stimulate the SNS. 
4. I also agree that not all yoga practices are designed to quiet and calm the mind exclusively. As you rightly note, in the Hatha Yoga tradition, there is the idea of “firing the vessel,” as with pottery, to strengthen it and make it resilient under the challenges of the deeper levels of mental practices of yoga as one moves towards states like samadhi. So, at times, we want to stimulate the SNS, too, but not right before bedtime!

Nina wrote back: "I’d like to add that I wasn’t saying that backbends and/or flow don’t reduce stress by releasing held muscle tension! I was just saying that I did not believe that they actually triggered the Relaxation Response, which is something very specific. There is a difference between being in a pose and triggering the Relaxation Response in that pose (for example, Viparita Karani) and doing a lot of exercise and then feeling less stressed AFTER the exercise session."

To which I’m adding: Nina, this is a good point. In the moment of practicing, practices like deep, challenging backbends and strong flow practices will likely trigger the Sympathetic branch of the nervous system. If this is a strong enough stimulation, it could be challenging to calm the system during the course of practice. Vickie Russell Bell has a good sequencing way of balancing things out in her evening classes where she provides adequate time to cool the nervous system down. This will ideally allow the practitioner to shift the nervous system to the Parasympathetic side of things, so the entire system can have a greater chance to quiet and calm both body and mind. A big challenge today is that many yoga classes don’t provide adequate cool-down time, often only leaving 4-5 minutes at the end of class for Savasana. This is not likely going to induce the Relaxation Response, which Herbert Benson, MD, noted comes on between 7-10 minutes. 

And this is certainly not a black or white issue. There are some fit and flexible students who will remain relatively neurologically calm doing the proposed back bend and flow practices, and will likely wonder what all the fuss of over!

—Baxter

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Are Backbends Stimulating or Relaxing?

by Nina

Margann Green, Age 77

Did anyone besides me notice that in his post Yoga Practices to Optimize Vagal Tone, Ram said included both backbends and flow sequences as asanas that trigger the Relaxation Response? 

Before I published that article, I queried him about that. Because both from my own person experience and from what I’ve learned from various teachers, I’ve always believed that backbends and flow sequences, especially done rapidly, were actually highly stimulating, even causing insomnia in people who practice them in evening classes (see Yoga and Your Emotions). And I always considered those two types of asana as something to avoid when I was feeling highly anxious, and when I’m not, I always finish a sequence that includes those poses with some nice long calming poses and practices to balance myself. 

But Ram, it turned out, had a very different perspective on this issue, and that led us to have a very interesting little email discussion about this topic. In the end, I decided that it would be a good idea to share the exchange with you. This will not only allow you to see a bit of what our blog is like “behind the scenes,” but you may also wish to join in the discussion by adding your own comments.  

Nina: I’m confused by the following statement. "All of the above sequences have a quieting effect on the nervous system, encouraging a shift from Fight or Flight mode to Rest and Digest mode- hallmark of an optimally functioning vagus nerve.” This doesn’t really apply to all the poses and sequences you mentioned, right? Can I say EXCEPT flow sequences, standing poses, and active backbends?

Ram: Reg your query, all the sequences I mentioned (flow, active backbends and inversions), optimizes the vagal tone, switch on the parasympathetic nervous system and move the individual to a Rest and Digest mode. Let me know if I need to change it again to make it more clear.  

Nina: Well, I really wonder about that. It seems like some challenging poses, such as backbends, etc. and maybe flow sequences, are actually stressful and so can trigger Fight or Flight. That’s why people often can’t sleep at night after a backbend or flow class just before bed. At least that is my understanding of how the asana practice isn’t always relaxing.  

Ram: Very interesting opinion, Nina. I guess we can argue about this without reaching a satisfying explanation. 

Yoga (asanas + all the other angas) is a means to achieve enlightenment (knowing one’s true nature, awareness, intuition, clarity etc). Physical and mental stress can cloud the mind and so over the years Yoga was adopted to relieve physical and mental stress. If yoga truly relieves stress, then why should anyone experience stress after doing a yoga pose be it a backbend or sun salutation? I have never ever felt stressed out after doing yoga (even after attempting several challenging poses like in Ashtanga or Bikram); exhaustion yes, but not mental stress. 

In my opinion, the mental stress is not from the yoga poses but it is primarily due to the individual’s own demeanor before going to the mat. I can think of several possible reasons:

1. The individual continues to harbor disharmonious impressions while doing Yoga
2. The individual was not able to let go of the emotional turbulence even while doing the asanas
3. The individual got mentally challenged by the neighbors who were more agile
4. The individual did not like the particular teacher and was mentally upset
5. The individual did not appreciate the corrections from the teacher
6. The individual did not appreciate the neighbors who were sweating or breathing heavily. 

 All the above and others that I cannot think of right now can stress out an individual. So it is not asanas per se but the individual’s outlook and attitude.

I am not sure you will agree, but this has been my experience when teaching in the class. I do not want to put the blame on Yoga, at least not yet.  

Nina: Well, I will leave your post as is. But this is an interesting discussion that we should continue to have. 

I am not alone in my thoughts that some yoga asanas are stimulating rather than relaxing (perhaps “stress” is the wrong word, though I think others would agree with me in that they stimulate the sympathetic nervous system, just as some pranayma practices do). This is especially true for active backbends. (Recently at a class with Vickie Russell Bell, she said she always finishes the backbend section of her nighttime classes with a least a half an hour of relaxation, so people won’t go home and have trouble sleeping.) 

When I first started studying yoga, I had no idea why certain poses like Viparita Karani were so relaxing. But I experienced them as such. Later I learned from Roger Cole about baroreceptors and inversions. Likewise, I (and many others) have experienced backbends as highly stimulating. Many people talk about how they cause insomnia. We don’t have an explanation for this, but isn’t it possible than something physiological is going on that is causing this? For example, flexing the neck quiets the nervous system because of the baroreceptors. What does extending the neck, which we do in most backbends, cause? Or, Rodney Yee's theory was that exposing your vulnerable organs (the opposite of what animals on all fours do) triggers a bit of fear response. Maybe one day there will be a study on this. But for now, I’m sticking with my anecdotal experience and that of several of my teachers.

To me this is not “blaming” yoga; it is just another aspect of the asana practice. I think of the asanas as being developed to “fortify” the body for meditation, pranayma, and other spiritual practices, not to relieve stress. And backbends are an important part of a balanced asana practice to create a strong, healthy body. 

I agree with you, however, that the attitude with one approaches a yoga poses, perhaps one that you fear or dislike, could also contribute to its effects.

Ram did not respond to that message, so I guess he was still not convinced or was just busy with work, as he does have a full-time job after all! Then, yesterday, I was practicing Dhanurasana, and I noticed my heart racing after. It’s hard to breathe in this pose for me, as it is in many backbends. My breath speeds up for sure. Maybe my inhalations are longer. So I was wondering if the stuff Baxter taught me about pranayama and the nervous system (how longer inhalations are stimulating—see Pranayama: A Powerful Key to Your Nervous System) might apply to backbends as well and, likewise, flow, if it is rapid and challenging (like Ashtanga, which I have tried). That’s my latest theory of why backbends, flow sequences and other physically challenging poses do not trigger the Relaxation Response.

But as I told Ram, we can agree to disagree as there is no scientific study of this as far as we both know.

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Life-Changer: Understanding Your Autonomic Nervous System

by Nina

An Examination at the Faculty of Medicine, Paris by Toulouse-Lautrec

We’re going to have an anatomy lesson today! I know, I know, you thought after you graduated, you wouldn’t need to be learning any more dry, technical stuff. But I swear to you this information is so useful that it could literally change your life (see 2 Steps to Take Charge of Your Stress or Anxiety). I know that because it has changed mine.

So, take a deep breath and take a look at the autonomic nervous system. Your autonomic nervous system is the part of your nervous system that regulates involuntary body functions, such as heartbeat, blood flow, breathing, and digestion. It’s called “autonomic” (hahaha, I just learned this) because the system works autonomously (automatically) without your conscious effort. (You don’t need to tell your heart to beat the same way you need to tell your front knee to bend to 90 degrees in Warrior 2 pose. Voluntary movements, such as knee bending, are controlled by your somatic nervous system.)

Although the functions of the autonomic nervous system are generally outside of voluntary control, they are not outside of your awareness, and they may be influenced by your state of mind. For example, although you can’t tell your heart to beat faster or more slowly, you can feel it beating. And when you’re calm, you’ll notice that your heart beats more slowly and when you’re afraid or angry, you’ll notice it beating more rapidly. 

The autonomic nervous system is divided into two parts that function in tandem with each other: the Sympathetic Nervous System and the Parasympathetic Nervous system. After the autonomic nervous system receives information about your body and the external environment, it responds by stimulating body processes, usually through the sympathetic division, or inhibiting them, usually through the parasympathetic division. (Some sources also include the gut nervous system, or the Enteric Nervous System, as a third, separate part of the ANS. But I’m not going to take a stand on that anatomical debate.)

About Your Sympathetic Nervous System

Your Sympathetic Nervous System (SNS) prepares your body for stressful or emergency situations. That’s why it is commonly called the Fight or Flight response. To prepare your body to deal with a challenging situation or an emergency, your SNS releases hormones—adrenaline and noradrenaline—to increase your heart rate, blood pressure, blood flow to the muscles, and widens (dilates) your airways to make breathing easier. It also causes your body to release stored energy and increases muscle strength is increased. After all, you might need to fight or run! Something that is mentioned less often, but that I’ve really noticed myself and which is really pertinent to yoga, is that your SNS causes your mind to race to increase your ability to assess your current situation and make important decisions. 

Importantly, while your SNS is stimulating certain processes, it is also slowing body processes that are not needed in emergencies, such as digestion and urination. Healing, including restoration and building of tissues, is also slowed down. So you can see why you don’t want to be in a state of stress 24/7! 

In addition, because your body is working extra hard during stressful periods, it can just wear you out faster, which is why heart disease is associated with stress. And having a racing mind all the time, well, that causes emotional problems, such as anxiety and depression, as well as insomnia because you can’t let go and just fall asleep. All this why chronic stress is so harmful to your physical as well as emotional health (see Chronic Stress: An Introduction and Stress, Your Health, and Yoga for more info about chronic stress.) 

We can’t and should not eliminate stress entirely from our lives. Sometimes in the modern world we do need to get out of danger, including mundane situations such as getting out of the way of an oncoming car, or more in more rare circumstances, such as protecting a family member from a threat. But our stress response also prepares us for some really good things in life, including running a race, traveling to a foreign country, having a creative brainstorm, falling in love with someone (that can be so scary, right?) or even —ahem—having an orgasm. 

But problems arise when we’re living in a state of chronic stress due to demands of ongoing challenges, such as our job, commuting, or family problems. In this case, understanding what the symptoms of stress are can help you identify your current state. Because when you realize you’re stressed out, you can and should try to reduce your stress levels. And the thing that most people don’t realize is that you can intentionally change your nervous system from being in the stress mode triggered by your SNS to a different state.

About Your Parasympathetic Nervous System

Your Parasympathetic Nervous System (PNS) controls your controls body process during ordinary situations, enabling you to recover from stressful periods. That’s why it is sometimes called the Rest and Digest response. The PNS reduces the levels of stress hormones in your body, slowing your heart rate, decreasing blood pressure, and so on. After all, these organs don’t need to work as hard now that the stressful situation has passed. And, now that you’re out of danger, your racing mind will also slow down and you’ll experience feelings of relaxation (the PNS is also sometimes called the Relaxation Response). 

Importantly, the PNS stimulates your digestive tract to process food and eliminate wastes, and using the energy from the processed food is to restore and build tissues. After all, you need to build yourself back up after being depleted by a period of stress. So you can see how vital it is to spend some time in this mode, in which you are resting, recovering, and acquiring energy. 

It’s important to understand that Rest and Digest state is quite different than sleep (see Conscious Relaxation vs. Sleep). That’s why sleeping—if you can sleep—doesn’t fix stress-related problems, such as heart disease, high blood pressure, headaches, digestive problems, and so on. And, as you may have noticed, sleep also doesn’t quiet your mind, either, as many stressed people spend their days feeling anxious or wake in the middle of the night with a racing mind. That has a profound effect on your emotional well-being. So the bottom line is that if you want to do your best to protect both your physical and emotional health, you need to make an effort to less time in stress mode and more time in conscious relaxation mode. 

But, if your autonomic nervous system is “automatic,” how exactly can you change it?

Influencing Your Autonomic Nervous System with Yoga

Remember, I said earlier that although the functions of your autonomic nervous system are generally outside of voluntary control, they may be influenced by your state of mind. I also said that the autonomic nervous system responds to information that it receives from both your body and the external environment. And this is why yoga is such a powerful solution for managing stress. 

Quieting Your Mind. Yes, it turns out the original purpose of yoga described in the Yoga Sutras as “the stilling of the changing states of the mind” is one of the keys. By meditating—which typically involves concentrating on a non-stressful sight, sound, or physical sensation—you can quiet your mind. This in turn switches your nervous system from stress mode to relaxation mode. (See The Relaxation Response by Dr. Herbert Bensen for complete information on this.) 

Working with Your Breath. It also turns out that pranayama—or breath control—allows you access your nervous system. By slowing your breath, as it would be in a state of relaxation, you can actually switch your nervous system from stress mode to relaxation mode. Baxter described how this works in his post How Your Breath Affects Your Nervous System.

Working with Your Environment. Finally, you can use your asana practice to create physical environment that will encourage your nervous system switch from stress mode to relaxation mode. Practicing relaxing or quieting yoga poses, such as restorative poses and supported forward bends, in a warm room, will send messages to your nervous system that you’re safe and comfortable. Yoga nidra and other forms of guided relaxation that you practice in Savasana will have the same effect. Inverted poses are a special case because these yoga poses take advantage of the mechanisms in your body that control your blood pressure to “trick” your nervous system into switching into relaxation mode (see Why You Should Love Your Baroreceptors). 

See The Relaxation Response and Yoga for more information about how you can use yoga to trigger the relaxation response. 

Well, it seems I’ve gone on much longer than I expected, but I felt I had some important things to explain. For those of you who didn’t already know this information about the nervous system, I hope you will find it as compelling as I do, and that it will empower you to deal more effectively with stressful situations and reduce your overall stress levels.

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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.

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Your Key to Your Nervous System: Your Breath

by Nina

Tide Under First Bridge by Brad Gibson

NOTE: This post has information in it that has been corrected in a later post called Falling for Yoga Myths: Yawning and Sighing and Your Breath. Please read the later post after reading this one!

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.

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?

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Chronic Stress: An Introduction

by Nina

Wounded Bird by Brad Gibson

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.

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.

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