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Human body weight is a person's mass or weight.
Strictly speaking, body weight is the measurement of mass without items located on the person. Practically though, body weight may be measured with clothes on, but without shoes or heavy accessories such as mobile phones and wallets, and using manual or digital . Excess or reduced body weight is regarded as an indicator of determining a person's health, with body volume measurement providing an extra dimension by calculating the distribution of body weight.
Average adult human male weight varies by continent, from about in Asia and Africa to about in North America, with men on average weighing more than women.
The Leffler formula is used for children 0–10 years of age. In those less than a year old, it is
and for those 1–10 years old, it is
where m is the number of kilograms the child weighs and am and ay respectively are the number of months or years old the child is.
The Theron formula is
The most common estimation of IBW is by the Devine formula; other models exist and have been noted to give similar results. Other methods used in estimating the ideal body weight are body mass index and the Hamwi method. The IBW is not the perfect fat measurement, as it does not show the fat or muscle percentage in one's body. For example, athletes' results may show that they are overweight when they are actually very fit and healthy. Machines like the dual-energy X-ray absorptiometry can accurately measure the percentage and weight of fat, muscle, and bone in a body.
Fluctuation
Body weight varies in small amounts throughout the day, as the amount of water in the body is not constant. It changes due to activities such as drinking, urinating, or exercise. Professional sports participants may deliberately dehydrate themselves to enter a lower weight class, a practice known as weight cutting.
Ideal body weight
Ideal body weight (IBW) was initially introduced by Ben J. Devine in 1974 to allow estimation of drug clearances in obese patients; researchers have since shown that the metabolism of certain drugs relates more to IBW than total body weight. The term was based on the use of insurance data that demonstrated the relative mortality for males and females according to different height-weight combinations.
Devine formula
The Devine formula for calculating ideal body weight in adults is as follows:
Hamwi method
The Hamwi method is used to calculate the ideal body weight of the general adult: (1997). 9780412136412, Jones & Bartlett Learning. ISBN 9780412136412
Usage
Sports
Many disciplines in weightlifting or separate competitors into .
Medicine
Ideal body weight, specifically the Devine formula, is used clinically for multiple reasons, most commonly in estimating renal function in drug dosing, and predicting pharmacokinetics in morbidly obese patients.
Average weight around the world
By region
Data from 2005:
By country
18–79 2007–2009 Encuesta Nacional de Salud 2009–2010 (p. 81)
Global statistics
Researchers at the London School of Hygiene and Tropical Medicine published a study of average weights of adult humans in the journal BMC Public Health and at the United Nations conference Rio+20.Data extracted from
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See also
External links
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