Epidemic of sloth

I have mentioned previously that I reckon one of the most serious of the negative effects of motorized traffic is car-induced sloth.

There is a ton of evidence that physical activity is almost incredibly beneficial to health – if it were a drug you could swallow they would have put it in the water supply by now. “A ton of evidence”. Hmmm yes, that is a bit handwavy, I know. So, for my imaginary reader who is a naïf in the shouty world of transport policy:

* A bibliography of some actual proper journal papers

*A more lengthy (and chatty) compendium of evidence from Cycling England (and the very fact that the government created a quango to promote cycling tells you something about the amount of evidence)

If you care to google some suitable terms, you will find that there is more.


So yes, ok fine. Personally I’m prepared to take as given that moving about under my own muscle-power is good for me. I don’t have to chase up every single journal article – I’ll trust the published work of epidemiologists and medical statisticians and physiologists and whoever because I have no reason whatever to doubt that their knowledge is much more deeply grounded than mine in their areas of expertise. So physical activity is good for you, and it is very “dose responsive” – even a small amount is beneficial and you have to do a huge amount for it to be damaging.

I was thinking about this yesterday, while walking back home from Bristol City Museum, where I’d gone to buy a nice card for my mum in the museum shop (about half an hour each way). I wondered about the other side of the problem – how much physical activity are “we” actually doing?

I knew the recommended minimum levels – a total of two and a half hours a week of brisk walking or normal cycling plus a bit of muscle-type exercise. Two and a half hours walking? That’s really not a lot. A fifteen-minute-each-way commute to work would cover it – then dig the garden at the weekend and you could be smug. And anyway, the world seems to be chock-full of amateur athletes these days. Whole magazines devoted to triathlon and running and cycling and climbing and anything you can think of. Whole shops full of (frankly, rather sexy, cough) sports gear. Endless, endless, internet chat about the arcana of sports footwear. Everyone’s at it! I was suddenly overcome with doubt – surely there just couldn’t be a problem with levels of physical activity? Find some research.

First stop for this kind of question has to be the Office of National Statistics. From there I found the publication statistics on obesity, physical activity and diet 2013. The physical activity section relied heavily on some research from 2008, the health survey for England – 2008: physical activity and fitness.

Part of the survey involved a people wearing accelerometers while going about their daily lives so we have some objective measure of activity levels. The standout sentence in the summary report was:

Based on accelerometry, only 6%of men and 4%of women met the government’s current recommendations for physical activity, by achieving at least 30 minutes of moderate or vigorous activity on at least five days in the week of accelerometer wear, accumulated in bouts of at least 10 minutes

5% of the population manage to do what is, or should be, for an average person (and I’m sorry to have to put it this way, but really) the equivalent of a piddly bit of walking. It even counted if you did it in 10 minute bursts – the time it took me to walk to the bus or tube when I lived in London, the time it takes me to walk to the coach station in Bristol.

But wait, you think, maybe the survey included a disproportionate number of “old folk”. Well it was a proper large random sample, so the proportions would have matched those in the wider population, but just before I disappear in puff of flabbergastedness, let me add that, of course, as you would expect, the youngest age group did take a lot more exercise:

Men and women aged 16-34 were most likely to have met the recommendations (11% and 8%respectively),

I hardly know what to say. Yes, I knew that levels of activity were not as good as they should be, but it really hadn’t connected for me quite how bad things are … and yet there’s all that hoo-har about sport and fitness and going to the gym and doing marathons for charity … oh, we are such symbolic creatures aren’t we?


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