Re: Recommended Body mass index thresholds for women
- From: calypso47@xxxxxxxxxxx
- Date: 27 May 2005 23:18:01 GMT
The bmi does exactly what it was designed to do. Every one wants to tell
us how arnnie s. proves it is wrong, or some nfl jock; and I will throw in
fashion models to make the same point in the oppisite direction. Both are
not normal, they are distortions people express in the normal distribution
curve that bmi uses. Nor is the question ignored by the "stupid"
scientists who don't know what direction is up, because evryone wants to
see themselves as another arnnie or model who proves that the abnormal is
the rule. In the now outdated charts using "small, medium, large" bones;
everyone saw themselves as "large" who could carry more weight. The best
use of the bmi is in conjunction with waiste measure, the latter being
more finely tuned to the more specific question of body fat percent and
distribution then the bmi does as a statistical expression that covers
just about everyone just fine. Consider:
http://www.nhlbi.nih.gov/guidelines/obesity/e_txtbk/txgd/4142.htm
The numbers cover both genders the same, there has been some adjustment
based on populations in some areas where the risk factors upon which the
bmi cutoff,ie. 25 for upper limit for normal, were originally formed. In
those populations it is usually found that the cutoff is best put at 23 or
so to account for the same risk level.
>>>>The BMI is an outdated statistical formula that doesnt translate into
>>>>real life. Not only does it not address the gender or age factors but
>>>>the most important variable is a persons BODYFAT percentage. Two men
>>>>could weigh 180lbs @ 6ft tall but one is at 10% bodyfat and the other
>>>>at 28% bodyfat - they would have totally differen physiques yet be
>>>>considered the same BMI - so its a stupid outdated formula.
>>>
>>> Do you have some new method of measuring lean body mass with high
>>> precision? (<5% deviance)
>>
>>Well, I don't know if it's "high precision", but I read of this formula
>>(for men):
>>
>>Percentage of fat body mass =
>>= {Weight in kilos - [44.636 + (1.0817 * Weight in kilos) - (0.7396 * Waist
>>in centimeters)]}/Weight in kilos*100
>>
>>For instance, if Weight is 63 Kg and Waist is 78 cm, here we go...:
>>
>>{63 - [44.636 + (1.0817 * 63) - (0.7396 * 78)]} / 63 * 100
>>= (63 - 44.636 - 1.0817 * 63 + 0.7396 * 78) / 63 * 100
>>= (18.364 - 68,1471 + 57.6888) / 63 * 100
>>= 12,5% fat body mass
>>
>>
>>> BMI can be measured with very high precision.
>>> Only problem is when BMI is on the limit to be fat, that is, BMI
>>> 25-28.
>>> When passing BMI of 30, you are definitively overweight, even if you
>>> have a lot of muscles (you must have in order to move). Generally, a
>>> person with BMI 35 has much higher total EE than a person of 20.
>>
>>I read that someone has a different view about that....
>>
>>they say that BMI shouldn't exceed 22% in men and 20% in women,
>>
>I think it should be the other way around for obvious reasons.
.
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