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Water can be pretty unforgiving. According to this, the USA had about 9 deaths in 2010 in triathlons. There are quite a few events with a lot of participants, but that just sounds unacceptable for any sporting event.I've never run a triathlon, but I have had a 2-leg cramp away from shore in salt-water. It was disturbing. According to the article above... Panic? I suppose, perhaps it is in part how one deals with something like a cramp, fatigue, or other injury.I'm seeing a few notes on portable life-jackets. http://www.youtube.com/watch?v=8ZpM0ulAfYUhttp://www.dcrainmaker.com/2012/05/myswimit-safety-device-good-or-bad-for.htmlRead the comments in the second link. I'm surprised the device isn't designed in the proper location right into the wetsuit, but perhaps an advantage of having it in a pouch is that it can be shared. Anyway, it might be worthwhile to require something like portable inflatable life jackets for first-time participants, and encourage others to carry them, as much to get them distributed in the group as anything else.
Is sheepy going to enter an Iron-ram? In a general sense, whilst swimming is a good form of exercise it is not entirely risk free. I do a lot of openwater swimming (not Tri's they are a bit too much like hard work) and I am a swiftwater rescue technician, so have learnt a little bit about the risks associated with cold water.When swimming hard in a race, it is quite easy to over exert yourself - and simply not get enough oxygen into the body, this can lead to heart failure. This can be compounded if you miss a breath or swallow water.There is also, on entering the water, the cold shock reflex triggered by rapid skin cooling - this can be reduced by conditioning yourself, but it is a reflex so cannot be eliminated entirely. It is the sudden gasping intake of breath when first entering cold water and can lead to hyper-ventilation. Part of the cold shock reflex is vasoconstriction - the blood vessels contract. This makes your heart work harder and can lead to heart failure particularly if you demand that it starts windmilling arms and kicking legs to win (or at least compete in a race) When you have survivied Cold Shock your body has to deal with the temperature change - water is far more effective at cooling you down than air and a wetsuit simply slows this process. Your body's natural reaction is to reduce the blood supply to the extremities in order to maintain core temperature. Doing so reduces the amount of oxygen avaliable for the muscles to work and will eventually lead to swim failure (aka cold incapacitation) where it is simply not possible to use your arms and legs to keep yourself afloat. It is a misconception to say that people who fall into icy water die of hypothermia in the water in x minutes, but they do drown in x minutes because their limbs stop working.
Many were increasingly of the opinion that they'd all made a big mistake in coming down from the trees in the first place. And some said that even the trees had been a bad move, and that no one should ever have left the oceans.
(no problem - I do occasionally get annoyed about the dieing of hypothermia in cold water thing - indeed there are a couple of cases - most noticeably Anna Bågenholm where hypothermia has actually prevented drowning -http://youtu.be/jLr15BBBtrc is a clip from a BBC Horizon documentary about it)There are issues when you get out of water after a prolonged period - although I am unsure whether they would affect Triathletes. There is a very complex physiological response known as circum rescue collapse - which I belive was a phrase coined 70 years ago in relation to recovering downed airmen from the sea. Briefly, if you remove a casualty from water vertically, they will suffer from a sudden loss of blood pressure that often leads to heart failure. This relates to the body's response to the pressure of the water, (the pressure 1m below the surface is aproximately 100mbar greater than at the surface) pooling of blood, the effects of the cold and the stress of needing rescuing! However if the casulaty is removed from the water horizontally, this is far less likely to occur.I think that the drop in blood pressure is probably on a spectrum so at the milder end it manifests iteself as "jelly legs" when you get out the water and perhaps, combined with the adrenaline/ cortisol of a race situation could trigger heart trouble during the transition.
" In A Triathlon, Why Do Most People Die In the Swimming Event ? "Because we are land animals?
Thanks Neilp..........you'd think that even though we are land animals we'd also have the ability to be natural fliers!... After all , we're surrounded by air (though I know we live on the land). Evolution should have left us with an affinity for the atmosphere!To be fair we are very good generalists. Compared to other animals that climb trees, we swim quite well.For reasonably good swimmers, we are very good runners.For good runners we do a very good job of climbing trees.Pretty much the only thing we are bad at is flying.But, when it comes down to it, if you get cramp on land, you fall over. If you get cramp in the sea you drown.Also, we are well equipped to lose heat- we have little hair (well, ewe might have plenty...), and we have the most successful sweat glands in the animal kingdom.(That's not something to brag about in a night club- trust me).The counterpoint to that is that we are rather susceptible to the cold.Water is a poor conductor of heat, but it's a great deal better than air. It also has a large heat capacity so it's very good at chilling you.We are warm blooded- getting too cold really messes us up- especially our brains and without the processing power of the brain we are in real trouble.So, if we leave our normal habitat and go somewhere rather cold then exercise pretty much to the point of collapse, we are pushing out luck.Sometimes, the luck runs out.