How Much Physical Activity is Enough?

by Nina

The Walk by Vincent van Gough

After reading all those posts by Ram and me (Sitting is the New Smoking, The Ill Effects of Prolonged Sitting (Part 2), The Ill Effects of Prolonged Sitting (Part 1)) about the dangers of being sedentary and/or inactive, you might be wondering exactly how much exercise do you need to do to counteract the time you spend sitting. (A great many of us work at desk jobs, so for many of us spending many hours a day sitting is just a fact of life.) Fortunately for us, some scientists had the exact same question. A recent study in The Lancet called Does physical activity attenuate, or even eliminate, the detrimental association of sitting time with mortality? A harmonised meta-analysis of data from more than 1 million men and women reported the results of a systematic review (meta-analysis) of data from 16 studies that associated daily sitting time and physical activity with �all-cause� mortality. 

I don�t want to keep you in suspense, so I�ll just tell you what they found: 60-75 minutes per day of physical activity seemed to eliminate the increased risk of death associated with too much sitting time. Here�s the conclusion of the study: 

�High levels of moderate intensity physical activity (ie, about 60�75 min per day) seem to eliminate the increased risk of death associated with high sitting time. These results provide further evidence on the benefits of physical activity, particularly in societies where increasing numbers of people have to sit for long hours for work and may also inform future public health recommendations.� 

Now that might leave you with an important question: do I have to do all that exercise in single session?

In the NPR piece in which I heard about this study Care To Offset All Your Office Sitting? It'll Take Just An Hour A Day, Allison Aubrey asked the lead author of the study, Prof Ulf Ekelund, PhD, those very questions. He told her that the answer is yes, you can do your exercise in bits and pieces, at different times of the day, and with different types of exercise He said just be sure that the intensity of your exercise is high enough to get your heart rate up (walking at a brisk pace, for example). He also added, somewhat encouragingly, that even 20 minutes reduces some of the risk. But the more you can exercise you can do, the better. 

So that means if you're practicing yoga for exercise, you don't have to do a single practice that is at least one hour long�you could, for example, do one half an hour in the morning and one half an hour in the evening.  And you could also do a shorter practice and combine with a brisk walk or a bicycle ride or any other physical activity that you enjoy. 

I�m sure we�ll be hearing more on this topic in the near future and they'll probably be changing their minds like they always seem to do. But I say for now aiming for 60 minutes of physical activity per day is a reasonable goal to aim for. Are you with me?

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Sitting is the New Smoking

by Nina

Woman Smoking by Kitagawa Utamaro

�Being out of shape could be more harmful to health and longevity than most people expect, according to a new, long-term study of middle-aged men. The study finds that poor physical fitness may be second only to smoking as a risk factor for premature death.� �Gretchen Reynolds, New York Times 

Have you heard the phrase �Sitting is the New Smoking� yet? Because recently I�ve been hearing it more and more often. And although lthough Ram didn�t use it in his recent post The Ill Effects of Prolonged Sitting he did say, �For people who engage in prolonged sitting activities, their risk of heart attack is about the same as smoking.� 

His post cited three different studies that showed the dangers of spending too many hours a day sitting. (That post got me to spend more time standing up at my sit-stand desk!) Then just a week later I read a NY Times article Being Unfit May Be Almost as Bad for You as Smoking about a new study on the longevity of men who were active versus those who were inactive (they measured aerobic capacity to indicate the subjects' general level of activity and fitness). What was special about this study was that it focused on a large group of about 1,000 healthy Swedish men of age 50, and followed them through the rest of their life spans (45 years!). (Many of these types of studies in the past have been done on older people for much shorter periods of time.)

The conclusion of the study Low aerobic capacity in middle-aged men associated with increased mortality rates during 45 years of follow-up was this:

�In this representative population sample of middle-aged men, low aerobic capacity was associated with increased mortality rates, independent of traditional risk factors, including smoking, blood pressure and serum cholesterol, during more than 40 years of follow-up.� 

And not only was poor fitness/low aerobic capacity second only to smoking as a risk factor for increased mortality, it was actually even unhealthier than high blood pressure or high cholesterol! Yes, the study found that the men who were rated as highly fit but who had high blood pressure or high cholesterol levels tended to live longer than men who were rated as �out-of-shape� but who healthy blood pressure and cholesterol levels. 

And although the study just focused on men (an ongoing problem in scientific studies), the NY Times reported that: 

But �there is no reason not to think� that the rest of us would also share any beneficial associations between fitness and longevity, said Per Ladenvall, a researcher at the Sahlgrenska Academy at the University of Gothenburg, who led the study. Past studies involving women have found such links, he said. 

Perhaps I am preaching to the choir by sharing this information (because you may already be practicing yoga on a regular basis and understand all its many benefits), but for those who are not yet physically active or who have family members or friends who are not active, the takeaway is clear: start being more physically active! The New York Times article concluded by quoting the Dr. Ladenvall saying that even small amounts of physical activity can have a positive effect.

�Encouragingly, if you now are concerned about the state of your particular aerobic capacity, you most likely can increase it just by getting up and moving. �Even small amounts of physical activity,� Dr. Ladenvall said, �may have positive effects on fitness.�

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The Ill Effects of Prolonged Sitting

by Ram

Paul Writing by Camille Pissarro

We live in a hyper-competitive world, where most of us work at stressful, sedentary jobs. In fact, nearly 86 percent of American workers sit all day at their jobs. Furthermore, accumulating evidence suggests that we spend a majority of our time sitting and indulging in sedentary activities. Sedentary activities includes the time spent sitting in an automotive on a long commute, sitting at a desk at work, sitting on the couch after work, watching television, reading, and playing games or surfing the internet. Recent research indicates that on an average, an American adult spends 10-12 hours each day sitting. Notice that sitting is now the norm and physical exercise is considered an intervention program advised by your personal physician to nullify the negative impacts on your health.

Prolonged sitting time considered as one of the major instance of sedentary behavior has emerged as a strong risk factor for various negative health outcomes. Study results have demonstrated associations of prolonged sitting time with premature mortality, chronic diseases such as cardiovascular disease, diabetes, and cancer, metabolic syndrome, and obesity. Those who spend a lot of time sitting have an almost eight-fold increased risk of dying prematurely compared to those who exercise often and are hardly sedentary. Medical experts agree that one of the reasons for a high rate of obesity, high blood pressure, diabetes, cancer, depression and other health issues seen predominantly in younger age individuals is due to prolonged sitting and physical inactivity. For people who engage in prolonged sitting activities, their risk of heart attack is about the same as smoking. The negative consequences are so alarming that medical experts have started referring to the poor health outcome from prolonged sitting as �sitting disease�. 

The ill effects from prolonged sitting are not restricted to the US population alone. In a recent study All-Cause Mortality Attributable to Sitting Time: Analysis of 54 Countries Worldwide in the American Journal of Preventive Medicine, researchers used survey data from 54 countries, analyzing the time spent sitting more than three hours a day along with data on population size, actuarial tables, and overall deaths. More than 60 percent of people worldwide spend more than three hours a day sitting down, and the researchers calculated that sitting time contributed to some 433,000 deaths a year (nearly 3.8% of all-cause mortality) among those 54 countries. 

The above findings agree with another survey of some 220,000 Australian adults Sitting time and all-cause mortality risk in 222 497 Australian adults that was published in the Archives of Internal Medicine. Those who sat for more than eight hours a day had a 15 percent greater risk of dying within three years than those who sat for fewer than four hours a day. The results were more alarming for those who sat for 11 hours or more a day; they had a 40 percent greater risk of early death compared to those who sat for under four hours. This risk sustained even for those who spent some time exercising. Experts now are of the unanimous opinion that even 30 minutes of physical activity is insufficient to neutralize the detrimental effects of 8 hours or more of sitting.

You may wonder why prolonged sitting contributes to negative health outcomes. There are evolutionary and biochemical reasons for this. As humans, our body was simply not designed to sit for prolonged hours. We were evolutionarily designed to "work out,� as evident from our ancestral hunter-gatherers. Hence our body reacts negatively to prolonged sitting. At the cellular level, numerous changes happen all of which trigger the detrimental effects. Prolonged sitting:

• decreases the activity and levels of an enzyme that helps burn fat
• reduces bone mineral density and blocks new bone formation
• reduces the diameter of arteries putting the individual at risk for heart disease
• makes the body insensitive to insulin thus resulting in type-2 diabetes

Additionally, prolonged sitting affects the architecture of the spine, hips and neck as well putting the individual at risk for skeletal fractures. Furthermore, a recent study Television Viewing and Time Spent Sedentary in Relation to Cancer Risk: A Meta-Analysis found that prolonged sitting whether at work or home increases the risk of three cancers namely colon, endometrial and lung. The study also found that high participation in sedentary activities and low participation in physical activities was linked with a 41 percent higher risk of recurrence of colorectal adenomas.

For many of us sitting for eight hours a day at our job is inevitable. This compounded with the extra sitting outside of work is what makes it harmful. Besides, too much sitting is harmful even if you're getting enough exercise. This means you could be meeting the recommended guidelines for a daily exercise but you will still be at higher risk of disease if you sit for long periods each day. So how can one avoid the dreaded effects that come from prolonged sitting? The best solution is to drastically change your lifestyle. While standing for long hours by no means is the answer, most experts recommend a 50:50 sit-stand allowance for optimal health. If your occupation involves sitting for long periods, work at a standing desk. The potential benefits from a standing desk are manifold including: higher productivity, reduced absenteeism, and lower health care costs among many (see A Neutral Posture White Paper). Experts also agree that it is beneficial to interrupt sitting time as often as possible. One way to do this is to move or stretch for at least 10 minutes for every hour of sitting time. 

For those of us who have an active yoga practice, you can either bring in a mini office yoga series (Featured Sequence: Mini Office Yoga Practice) or supplemental yoga with you (Yoga, Your Companion Through the Day). If you need to stretch your back and do not have too much time at hand, you could think of the mini series for the back (Featured Sequence: Low Back Care). Since prolonged sitting is not only having an impact on public health but also has effects on the health span of the individual, it is never too late to make simple changes and maintain a reasonable amount of activity particularly across the middle and later years to avoid early death and serious illness. 

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Energizing Yourself: Overcoming Styana and Alasya (Rerun)

by Nina

Women and Birds at Sunrise by Joan Miro*

I don�t know about you, but Ram�s post The Dangers of Being Sedentary scared me a bit. 

Findings from a recent study showed that individuals who sat for more than 11 hours daily were 40 percent more likely to die within the next three years than those who sat for four hours or less daily�even when people�s physical activity at other times of the day was accounted for. Studies have also indicated that sitting daily for less than 3 hours and watching TV for less than 2 hours extends life expectancy by an estimated 1 to 2 years. Studies reported in the prestigious journals Lancet and the British Medical Journal suggest that a sedentary lifestyle is the cause of one in 10 deaths worldwide. It�s now known that Americans are working less (26 minutes a day less compared to Y2007) and idling off more. Adults in the U.S. spend an average of 55 percent of their day engaged in some kind of sedentary behavior (see Sedentary behaviour and life expectancy in the USA: a cause-deleted life table analysis).

In his post, Ram identified two obstacles that cause us to be sedentary: styana (inefficiency, idleness, procrastination, dullness) and alasya (laziness, sloth). The problem is, how do we overcome these obstacles? I mean, we all basically know that sitting around all day isn�t a good thing, but after hours of doing it�so many of us sit at desks all day or have long commutes�inertia tends to set in. And this can create a lot of resistance to the idea of getting up to practice yoga, even if you know it will be good for you and that you�ll feel better afterward. You think: Oh, I just don�t feel like it today�maybe tomorrow.

"Old man, stiff man, weak man, sick man, they can all take practice but only a lazy man can't take practice." � Sri K. Pattabhi Jois

I know this because even after years of practicing yoga at home on my own, I sometimes notice that tendency in myself. I do have some tricks up my sleeve, however. And I thought today would be a good day to share them, so you�d have some new ideas for fighting both styana and alysya.

My first trick is a mental one: I tell myself that I don�t need to do a full practice, that I can just do one single pose, you know, like Downward-Facing Dog. But I might want to warm up a bit before that one, so, let�s see, maybe a Half Downward-Facing Dog at the wall followed by a full Downward-Facing Dog on my mat. And guess what, by that time, my energy starts flowing and my momentum starts to build, and I end up doing a full-length practice.

My second trick is to pick a pose to start that will energize me, even just a bit. I know that moving with your breath is a good way to fire up your energy. So standing in Mountain pose and raising arms overhead on the inhalation and down by your sides on the exhalation is a good way to energize yourself, maybe even shake off a feeling of depression, and that can lead to some other vinyasas or who knows where.

But if you don�t feel like standing up�yeah, I know, sometimes you just don�t�you can get on your hands and knees and do the Cat-Cow pose, inhaling as you come into the Cow position (the sway back position) and exhaling as you come into the Cat pose (the arching position). That leads very nicely into Downward-Facing Dog pose, and then maybe Standing Forward Bend, by which time you might feel ready to stand up on your mat!

My third trick is that when I�m feeling particularly tired or lazy, I tell myself that I can start lying down. Ah, yes, lying down sounds real good.

Often I start with Reclined Leg Stretch and other reclined hip openers, and even just moving my legs around gets me in the mood for a Downward-Facing Dog pose (and helps make that pose easier), which in turn leads....

Another way to energize yourself is to open your chest, and that�s also a good way to counteract all the forward bending you�ve been doing by sitting down for hours. Good news is this is also something you can do lying down. Try a passive backbend over a blanket roll or a bolster for three or more minutes (see Featured Pose: Supported Backbend). Then roll over and see what you might feel like doing next. Lately I�ve been starting by doing a reclined shoulder opener that my teacher often has us do in the middle of class: lying on your back, with a strap just above your elbows, bring your arms up and overhead (if they don�t reach the floor, try holding a block between your hands). Three minutes of that, and if I�m not ready for Downward-Facing Dog pose, I might procrastinate a bit with some reclined hip stretches. It�s all good. 

And if this strategy doesn�t work? What if you only end up doing just the one or two poses? Well, that�s much better than nothing. It might even start a new habit that will allow you to gradually grow into a longer practice over time�my own home practice started with me practicing just a few poses. And, besides, you can always try again in a couple of hours....

Of course, what I�ve mentioned here are just a few of many possibilities. Readers, how do you shake off your lethargy and start moving? I�d love to hear your recommendations.

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