A low body positions magnify problems

RE: A low body positions magnify problems

Former Member — Wed, 18 Nov 2009 16:20:12 GMT

At standard temperature and pressure, the density of air is 1.2754 kg/m3 Density of water is 1000 kg/m3 or almost a 1000 times that of air. Good thanks! Funny thing is that I read today in Maglischo's book that water was.... 1000 times more dense than air! Great thanks again!

RE: A low body positions magnify problems

orca1946 — Wed, 18 Nov 2009 07:10:18 GMT

The swimmer's natural float level will dictate a lot of this as well.

RE: A low body positions magnify problems

beluga — Wed, 18 Nov 2009 06:57:17 GMT

By the way I remember having learned (throughout my coaching certification path) that water was 160 times more dense than air. I later tried to find more evidence of this I couldn't. If anyone can shed some light, confirm true or false... At standard temperature and pressure, the density of air is 1.2754 kg/m3 Density of water is 1000 kg/m3 or almost a 1000 times that of air.

RE: A low body positions magnify problems

Former Member — Tue, 17 Nov 2009 15:21:39 GMT

I come away with a lot of great stuff from clinics. Here's one that was a eye opener. A vessel (swimmer's body, legs) that doubles it's depth requires eight times the force to maintain the same velocity. So, big kicks vs. small kicks, a low body position vs. one that's up, makes a difference. I'm sure you guys knew that but I thought the 8x thing was great. Well there are few variables that need to be taken into account though. A low body position requires more force to maintain the same velocity, but if the kick required to raise the body requires even more energy then the net result of the equation may be increased energy expenditure to maintain same velocity. All that being said, as a rule of thumb, 2 things: 1) Relatively deep under the surface, you find less turbulence therefore some breaststrokers still like to sink relatively deep. 2) the water line isn't a good place to swim. Better be either over the waterline (like you say be elevating the body) or under the waterline (breaststrokers, dolphin kickers etc). By the way I remember having learned (throughout my coaching certification path) that water was 160 times more dense than air. I later tried to find more evidence of this I couldn't. If anyone can shed some light, confirm true or false...

RE: A low body positions magnify problems

funkyfish — Tue, 17 Nov 2009 06:49:16 GMT