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   » » Wiki: Waist
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The waist is the part of the between the and hips. On people with slim bodies, the waist is the narrowest part of the .

The waistline refers to the horizontal line where the waist is narrowest, or to the general appearance of the waist.


Structure
Because of this and because the waist is often synonymous with the stomach, one can become confused as to the exact location of the waist. Another confusing factor is that the waistline differs on different people. A study showed that self-reported measurements as opposed to measurement done by a technician, underestimated waist circumference and this underestimation increased with increased body size. In the study, waist circumference measured at the level of the umbilicus was larger than that measured at the natural waist. To locate the natural waistline, one need simply stand upright and then tilt over to the side keeping the legs and hips straight. Where the torso creases is the natural waistline.


Waist measurement
Waist size (waist ) is an indicator of abdominal . Excess abdominal fat is a risk factor for developing heart disease and other obesity related diseases. A study published in the European Heart Journal April 2007 showed that waist circumference and (defined as waist circumference divided by hip circumference) were predictors of cardiovascular events. The National Heart, Lung, and Blood Institute (NHLBI)
 [http://www.nhlbi.nih.gov/health/public/heart/obesity/lose_wt/risk.htm    Obesity Education Initiative, Aim for a Healthy Weight]
     
classifies the risk of obesity-related diseases as high if men have a waist circumference greater than and women have a waist circumference greater than .

The waist is usually measured at the smallest circumference of the natural waist, usually just above the belly button.

 [http://www.healthcalculators.org/calculators/waist_hip.asp Waist To Hip Calculator]
 at University of Maryland Medical System.
 Retrieved Dec 2010
     
Where the waist is convex rather than concave, as in pregnancy and obesity, the waist may be measured at a vertical level 1 inch above the navel. name="Brown">

Strictly, the waist circumference is measured at a level midway between the lowest palpable and the ,

 [http://www.bmj.com/content/311/7017/1401.abstract]
     
respectively typically 60% and 64% of total height. name= "(Gill & Parker, 2014)"/> It can be predicted as 72% of the neck height; an alternative approximation, very relevant in [[anthropometry]], is Small of the Back (SOB) + 2cm.
(2020). 9783033047631 .

It is important to note that variables such as posture significantly influence the measurement of the waist, and therefore any measurements for a group need to maintain a constant posture between the subjects.


Waist–hip ratio
Waist–hip ratio is the ratio of the circumference of the waist to that of the . It measures the proportion by which is distributed around the .

Waist–hip ratios of 0.7 for women and 0.9 for men have been shown to correlate strongly with general health and . Colloquially this shape is compared to the shape.Female Body Characteristics Related to Bra Fit - Page 20, 2007


Society and culture

Fashion
In modern clothing the region referred to as the waist is considerably below the waist as defined anatomically. With the advent of pants and skirts that do not require support from above, the clothing waist moved down to a position where the body starts to expand to form the buttocks and a support is therefore available. However, the waist region remains a highly important measurement and anthropometric landmark in garment construction.

, such as a , may be worn around either the clothing or anatomical waist.


Waist reduction and training
Waist reduction or waist training refer to the act of wearing a or other constricting garment to reduce or alter the waistline. The four may be permanently compressed or moved by such garments. A may also be used to alter the appearance of the waist.

Waist reduction may be used simply to reduce the width of the waist. This change can be permanent or temporary.

Waist training may be used to achieve a certain permanent waist shape, such as a .


History

Etymology
Definition: "middle part of the body," also "part of a garment fitted for the waist, portion of a garment that covers the waist" (but, due to fashion styles, often above or below it), probably from Old English *wæst "growth," hence, "where the body grows," from Proto-Germanic *wahs-tu- (cognates: Old English wæstm, Old Norse vöxtr, Swedish växt, Old High German wahst "growth, increase," Gothic wahstus "stature," Old English weaxan "to grow".


See also


External links

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