Body clock, nutrition and exercise

I watched Horizon documentary the other night:The Secret Life of Your Bodyclock and learned plenty about the way our bodies react throughout the day and night to our activities and conversely when those activities are best suited to our bodyclock. I was particularly interested by the ideas about exercise and eating. When is the best time to exercise and what should our eating patterns be like?

The documentary alluded to Siffre's famous experiments of living in a cave for 6 months without natural light to see how is body clock reacted. Based on this and other experts analysis the programme comes up with some interesting results:

- Between 7 and 11 in the  morning our body has an increased blood pressure, vessels can't widen and blood is stickier (more resistance to flow) showing that the heart is under great pressure. Statistically you are three times more likely to have a heart attack.

(Something I already knew! Mornings are for larks, not for people....)

- If you increase your activity at the right time of day it can be beneficial! Exercise in the afternoon reduces blood pressure by 10 -11 % while exercise in the morning does not reduce bp at all.

Even gently walking in the afternoon can be beneficial.

- Body temp and alertness rises in afternoon and exercise is best late afternoon /early evening.

When training or the Olympics, the cyclist Chris Boardman says he found no pain in evening training like he experienced in the mornings. Records in cycling tend to be broken in afternoon and evening. In cycling hard training seems to be often conducted in the evenings when the body temperature has risen. This helps as the body seems to be in a pre-race or warm up mode.

(The only caveat was that balance and hand steadiness may be better in the morning.)

- Our eating patterns now show that the average UK main meal of the day is at 8pm. Linda Morgan from Univ Surrey says that over the last 100 years our eating patterns have changed: 100 years ago we had big breakfasts, large lunches and less in evening. Recently this has been reversed so that little of our day's calories are consumed in the morning and more later in the night. This means glucose remains in the blood more in the evening: high blood glucose levels in the evening is not great. According to her experiments into eating we should aspire to: "Eat breakfast like a king, lunch like a prince and dine like a pauper."

So we haven't learned something we didn't already know, right? I mean we train in the evening as that's when most lessons are held: after people have come home from school and work and not too late as to interfere with our sleeping (I find if I exercise late int he evening I have to wait some time to come down before I can go to bed). 

Plus I eat too much anyway. Interestingly if I stack my calories up at the start of the day I'm in a better position for my insulin to regulate my blood glucose levels throughout the day (it seems). I did read a long time ago about an American football coach who recommended to players who wanted to lose weight to eat nothing after 8pm. This is something I aspire to do- it also helps with my IBS!

"Paleoanthropologists tell us that our ancestors left the trees for the ground millions of years ago. Competing hypotheses attribute this shift from a predominantly arboreal to terrestrial locomotion on postural-feeding, socialbehavioral, or thermoregulatory pressures. In any case there is a strong consensus among scientists that our heritage is deeply rooted in both climbing and bipedalism, i.e., both swinging from the trees and functioning on two feet."

"In the broadest and most useful sense, the functional distinction between arboreal and terrestrial skills is that arboreal skills are rich in pulling movements whereas the bipedal movements mostly comprise hip extension and pushing movements. As a consequence of this

distinction and the dearth of climbing skills drawn upon in fitness programs, the pulling capacity of modern athletes is woefully deficient. Compare briefly the number of pushing to pulling movements available in the course of our normal training. Push-ups, dips, handstand push-ups, bench press, shoulder press, and jerks versus, what, pull-ups and maybe rope climb?"

" Even the bodybuilding repertoire, which includes seated cable rows, bent-over rows, one-armed rows, and curls, includes more pulling movements than more functional and developmental weight training like weightlifting and powerlifting, but the motivation and value behind these moves is somewhat more anatomical or cosmetic than functional."

Thanks Crispin for pointing this out. Although a piece of advertorial for some climbing equipment I thought it was interesting to examine where we came from and how this affects our range of movement, limitations and strengths.

http://library.crossfit.com/free/pdf/18_04_Macroclimbing.pdf

The call of the dunes

As I woke up and curled under the duvet of the cold attic bedroom I knew the day had come. I could hear it calling me and although I wanted to stay a little longer in the warmth of the bed I could tell it wouldn't be long before my body would be inexplicably dragged to the seaside and beasted. To be honest I'd seen it coming. It had been calling me all weekend. The sea was waiting and I couldn't wait any longer. After a brief breakfast of a banana (this could have been a mistake but turned out to be fine in the end) I drove to the old fairground car park and looked out across the wide stretch of beach leading down to the North Sea. Seaton beach (recently famous as the place where the canoeist and scamster John Darwin lived and 'died') is beautiful. Wide and long with golden sand. Spoiled only by the odd littering it really is a marvellous place. The dunes, however have even more character and this is where I needed to run- to expend my energy and train my limbs and muscles.

As I set off on the bright and cold morning I headed to Longscar pier not knowing that when I arrived I'd be so inspired by the view that I'd continue on to Teesmouth which is what happened. Just before the pier I had picked up a fairly light but long log and perched it over my shoulders to give me more of a work out. At the mouth of the Tees there's a sand bar and small ridge of dunes where a lot of flotsam can be found. I exchanged my light log for a heavier one. It wasn't too bad-maybe 15-20kg but it was big!

I learned 3 main things as I chugged (I can't really say I 'ran') back to the car park along the dunes:

1. Breathe. It was a long old haul back to the car: about 2 miles and I was completely lost in the moment of carrying the log and progressing one foot after the next that I was aware of my

 breathing. Left to it's own course it was a choppy and fairly quick cadence: in over two paces and out over two paces. I found I could muster more energy by dropping into longer inhalations right down into my belly (using my diaphragm) and exhaling deliberately. It was enough to do this occasionally for a minute or so to keep me going.

2 Mind strength. More than a couple of times I thought, "Oh, knickers to this" and was about to drop the log, or even I found I wasn't jogging along but fast walking. Just at that point I simply told my body to keep going. Or I said sharply: "do it!" I was reasoning that actually my body could endure much more than it was going through at t hat moment and I used the power of my mind to keep at it. This time it worked! Other times it doesn't and I end up eating the chocolate bar....

3. Tucking my spine in. With the weight of the log and climbing dunes my bum started to stick out. I knew this wasn't a smart move as it puts great pressure on the lumbar region of the back so I tucked my butt in. This had the consequence of me waddling up the dune-with a straight back-but with my legs spliced out like a frogs'. Although seemingly ungainly I did work out my quads more in this fashion and saved my lower back some discomfort and possibly pain.

That last point reminds me of an article I read on Fighting Arts about front stance and posture. Go here to see 'A Simple Lesson in Body Mechanics'

Enjoy the route and the pics.

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