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Fitness Theory and Practice. CrossFit's rationale & foundations. Who is fit? What is fitness?

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Old 09-12-2006, 11:01 AM   #1
Tyler Fainstat
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Hello- Yesterday I had a fitness evaluation in a new gym I just joined. The physio had me stand on a machine that looked like an electronic scale. It electronically calculated that I have 23% body fat. I have been crossfiting for over two months, and always excercised religiously and eaten well.

My two questions are as follows, do these machines actually calculate accurately? What is a good body fat % to aim for?

Thanks very much for your responce(s)
Tyler
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Old 09-12-2006, 11:19 AM   #2
Anthony Bainbridge
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They aren't very accurate at all. They can vary dramatically depending on hydration, temperature, etc. I wouldn't even use it as a guideline to tell you if you're improving or not. For that, use a mirror - it doesn't lie. ;)

As for ideal body fat, are we talking about performance or looks? 8-10% for males is enough to get attention at the beach and is probably average for most athletes.

But honestly, I wouldn't worry too much about it ... if you continue training like this and eat properly, things will fall into place on their own.
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Old 09-12-2006, 12:06 PM   #3
Roger Harrell
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It's a bio impedence measurement. Not very accurate. No body fat check is terribly accurate but if you take the readings from several it will give you a good baseline.
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Old 09-12-2006, 08:55 PM   #4
Kevin McKay
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the most accurate you will get is hydro static weighing. If you want good numbers to base your protien intake on for the zone.
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Old 09-13-2006, 03:18 AM   #5
Anthony Bainbridge
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Just a nitpick, but DEXA is more accurate than hydro.
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Old 09-14-2006, 09:46 PM   #6
Veronica Carpenter
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What is DEXA?

And hyrdo is only as accurate as your ability to expel all the air in your lungs.
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Old 09-14-2006, 10:19 PM   #7
Andrew Cattermole
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Just pick one type, use it as a reference and make sure the testing is standarized so that all results are related to last test.
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Old 09-15-2006, 02:52 AM   #8
Fiona Muxlow
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Some of those scales, usually the cheaper ones, even though they claim to measure body fat actualy calulate your BMI, from details that are typed in and then give that as a body fat reading. Be careful.
Mirror and skin folds are often a better widely assesable option
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Old 09-15-2006, 03:37 AM   #9
Anthony Bainbridge
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Veronica, DEXA stands for dual energy X-ray absorptiometry. This is what came up from a quick search:

This test is used to measure bone density, but it also measures body fat percentage as well as where most of your fat is (as if you didn't know). The facts about DEXA:

- DEXA uses a whole body scanner and two different low-dose x-rays to read bone mass and soft tissue mass.

- It takes about 10-20 minutes to do a body scan

- It provides a high degree of precision with a 2-3 % margin of error.

- This is considered a gold standard for measuring body fat and bone density

- It's painless

- The cost is usually about $100.
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Old 09-15-2006, 11:30 AM   #10
Josh Brehm
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I seriously wouldn't spend $100 to see where my fat is and how much of it I have. I like the jumping mirror test. Jump in front of a mirror, while flexing. If something moves it's gotta go.
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