Waist to Height Ratio (WHtR)
Waist-to-Height Ratio (WHtR)
The waist-to-height ratio (WHtR) is calculated by dividing your waist size by your height. The WHtR may give a more accurate assesment of health for serious athletes, especially body builders, who have a higher percentage of muscle and a lower percentage of body fat, or for women who have a "pear" rather than an "apple" shape. A WHtR under 50.0% is generally considered healthy.
Current guidelines, as given by the World Health Organization, or the National Heart, Lung and Blood Institute, only give values for waist circumference. Those at substantially increased risk have the same risk as someone with a BMI of 30. Assuming the average male is 5' 9", and the average female is 5' 4", here are the waist cutoff values, and the corresponding WHtR
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Increased RiskSubstantially
Increased Risk
Waist (WHtR)
Waist (WHtR)
Men
37.0" (53.6%)
40.2" (58.3%)
Women
31.5" (49.2%)
34.6" (54.1%)
Here are some values of WHtR that I have come across:
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Subjects
WHtR
Barbie Doll
25.0%
Ken Doll
36.0%
Female College Swimmers
42.4%
Male College Swimmers
42.8%
Willoughby Ideal
45.8%
WHO Increased Risk Females
49.2%
General Healthy Cutoff
50.0%
NHANES Risk Equivalent to BMI of 25
51.0%
WHO Increased Risk Males
53.6%
WHO Substantially Increased Risk Females
54.1%
NHANES Risk Equivalent to BMI of 30
57.0%
Willoughby Obese
57.7%
WHO Substantially Increased Risk Males
58.2%
Conclusions about the NHANES data were lifted from Am J Clin Nutr 2002 76 743. An interesting perspective on height-to-waist ratio is provided in Int J Obes Relat Metab Disord. 2003 May; 27(5): 610-6. Also see Prev Med. 2005 Feb; 40(2): 216-20. Hsieh SD, Muto T., The superiority of waist-to-height ratio as an anthropometric index to evaluate clustering of coronary risk factors among non-obese men and women.
As your weight changes, you can expect to lose about 1" from your waistline for each 6-8 lbs of weight loss.
Here's an excellent thesis on the predictive power of Waist-to-Height Ratio for overall fitness written by Captain Steven Swiderski at the Air Force Institute of Technology.
Source : home.fuse.net
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