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BMI Limitations. 08/08/2010
1 Comment
 
Picture
A pear shape woman, is HEALTHY, yet it can be rated Overweight even Obese on a BMI chart. The body-builder also is given a False Obese rating using the BMI method to estimate Body Fat Percentage.
I am still having fun, spring cleaning and setting up house, following my arrival back to base camp cottage in Victoria, on Thursday afternoon.
My current project is converting the lower level, storeroom area of the split-level bedroom into an exercise area. 

Three bags full of rubbish to go out, piles of ribbons, arts and crafts supplies and stock for a  downsizing sale to start soon, and 12 hours of physical work including furniture removal as my calorie burn effort for the day, lol, I did my strength training moving a heavy table.

In the cleanup, I found a BMI and WHR or
Waist to Hip ration chart, I had made for me in a healthy weight medical assessment a year ago and the BMI put me at obese and the WHI puts me at normal healthy weight.  Two totally different figures and a skin fold test says I could still lose some excess weight but where that weight is, is not going to affect my health.  

 Three different, opinions from three, different tests, by the same-trained assessors.  

They put the least importance on BMI. 

As a swimmer, I have a lot of opportunity to see other women, entering or leaving a swimming pool wearing a costume that allows me to see the huge variation in each of us and I can plainly see that body fat percentage has nothing to do with height and weight. I can see for myself the total inaccuracy of BMI as a means of assessing fat percentage.


What is BMI

BMI was first proposed about 150 years ago as a way to estimate the body fat persentage of a human, using age, weight, height and sex to calculate the figure.  There are at least three different formulas you can use to work this out, none give an accurate assessment.  

The BMI value we can't tell definitely whether the person is thin or fat because it does not have the muscle mass to fatty mass percentage and yes some people's bones are thicker.  If you are assessing your body fat percentage and using BMI you may want to  take into account a number of other parameters along with the BMI.

Waist to Hip Ratio.

  • Waist-to-hip ratio: if the coefficient is 0.5 or more this means that a person has too much abdominal fat.  it is assumed that a WHR of 0.7 for women shows that she is has the ideal shape and body fat for good health and fertility. For men the optimal value of WHR is 0.9.
As the formulas for calculating true body fat percentage are too much like mathematics for my liking, lol, I simply strip off and look in the mirror, and decide, 'Yes, I have a little more work to do", or 'Looking good, maintenance time', and I also put my faith in excellent gym trainers interested in fitness and health, not just body image and pushing you to be slim, to advertise their gym or slim program.

lol, I have a feeling, that moving heavy furniture at 64 yeas of age, with my husband of almost 70, after midnight last night, lol, J, had a lot more to do with being an eccentric, personality than achieving my goal of balance in my life, but J, no harm done this morning, J, and I am very happy to have got the hard part out of the way, the rest is just a matter of working through the, sorting, organizing and downsizing.  Nowhere near as much fun though as the radical stuff I got up to last night nor the delight in finding those hip to waist ratio formulas and my peak flow airway monitor, that showed a 20% improvement in my lung capacity, to remind myself, I am ‘doing OK. J 

 


Comments

Carol Willis
08/08/2010 6:23pm

I totally agree about BMI - once I get to my goal weight, which I know is a good weight for me, I will still be on the high end of "overweight" according to the BMI calculation. I feel it's been over-used as a measure for women, particularly, to assess what their ideal weight should be. This, in turn, makes women obsess about a number on the scale instead of how they look and feel!

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