Body fat percentage
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The body fat percentage (BFP) of a human or other living being is the total mass of
The body fat percentage is a measure of fitness level, since it is the only body measurement which directly calculates a person's relative body composition without regard to height or weight. The widely used body mass index (BMI) provides a measure that allows the comparison of the adiposity of individuals of different heights and weights. While BMI largely increases as adiposity increases, due to differences in body composition, other indicators of body fat give more accurate results; for example, individuals with greater muscle mass or larger bones will have higher BMIs. As such, BMI is a useful indicator of overall fitness for a large group of people, but a poor tool for determining the health of an individual.[citation needed]
Typical body fat amounts
The examples and perspective in this section may not represent a worldwide view of the subject. (September 2021) |
Epidemiologically, the percentage of body fat in an individual varies according to sex and age.[1] Various theoretical approaches exist on the relationships between body fat percentage, health, athletic capacity, etc. Different authorities have consequently developed different recommendations for ideal body fat percentages.
This graph from the National Health and Nutrition Examination Survey (
In males, mean percentage body fat ranged from 23% at age 16–19 years to 31% at age 60–79 years. In females, mean percentage body fat ranged from 32% at age 8–11 years to 42% at age 60–79 years. But it is important to recognise that women need at least 9% more body fat than men to live a normal healthy life.[2]
Data from the 2003–2006 NHANES survey showed that fewer than 10% of American adults had a "normal" body fat percentage (defined as 5–20% for men and 8–30% for women).[3]
Results from the 2017–2018 NHANES survey indicate that an estimated 43% of noninstitutionalized U.S. adults aged 20–74 are obese (including 9% who are severely obese) and an additional 31% are overweight.[4] Only 26% were either normal weight or are underweight.
In 1983, the body fat percentages of American Olympians averaged 14–22% for women and 6–13% for men.[5]
Body fat guidelines
The examples and perspective in this section may not represent a worldwide view of the subject. (September 2021) |
Essential fat is the level at which physical and physiological health would be negatively affected, and below which death is certain.
Athletic performance might be affected by body fat: A study by the University of Arizona indicated that the ideal body fat percentage for athletic performance is 12–18% for women and 6–15% for men.[6]
Bodybuilders may compete at essential body fat range. Certified personal trainers will suggest competitors keep that extremely low level of body fat only for the contest time. However, it is unclear that such levels are ever actually attained since (a) the means to measure such levels are, as noted below, lacking in principle and inaccurate, and (b) 4–6% is generally considered a physiological minimum for human males.[7]
Measurement techniques
Underwater weighing
Irrespective of the location from which they are obtained, the fat cells in humans are composed almost entirely of pure
With a well engineered weighing system, body density can be determined with great accuracy by completely submerging a person in water and calculating the volume of the displaced water from the weight of the displaced water. A correction is made for the buoyancy of air in the lungs and other gases in the body spaces. If there were no errors whatsoever in measuring body density, the uncertainty in fat estimation would be about ± 3.8% of the body weight, primarily because of normal variability in body constituents.
Whole-body air displacement plethysmography
Whole-body air displacement plethysmography (ADP) is a recognised and scientifically validated densitometric method to measure human body fat percentage.[9] ADP uses the same principles as the gold-standard method of underwater weighing, but representing a densitometric method that is based on air displacement rather than on water immersion. Air-displacement plethysmography offers several advantages over established reference methods, including a quick, comfortable, automated, noninvasive, and safe measurement process, and accommodation of various subject types (e.g., children, obese, elderly, and disabled persons).[10] However, its accuracy declines at the extremes of body fat percentages, tending to slightly understate the percent body fat in overweight and obese persons (by 1.68–2.94% depending on the method of calculation), and to overstate to a much larger degree the percent body fat in very lean subjects (by an average of 6.8%, with up to a 13% overstatement of the reported body percentage of one individual — i.e. 2% body fat by DXA but 15% by ADP).[11]
Near-infrared interactance
A beam of
Dual energy X-ray absorptiometry
Dual energy X-ray absorptiometry, or DXA (formerly DEXA), is a newer method for estimating body fat percentage, and determining body composition and bone mineral density.
X-rays of two different energies are used to scan the body, one of which is absorbed more strongly by fat than the other. A computer can subtract one image from the other, and the difference indicates the amount of fat relative to other tissues at each point. A sum over the entire image enables calculation of the overall body composition.
Expansions
There are several more complicated procedures that more accurately determine body fat percentage. Some, referred to as multicompartment models, can include DXA measurement of bone, plus independent measures of
Body average density measurement
Prior to the adoption of DXA, the most accurate method of estimating body fat percentage was to measure that person's average density (total mass divided by total volume) and apply a formula to convert that to body fat percentage.
Since fat tissue has a lower density than muscles and bones, it is possible to estimate the fat content. This estimate is distorted by the fact that muscles and bones have different densities: for a person with a more-than-average amount of bone mass, the estimate will be too low. However, this method gives highly reproducible results for individual persons (± 1%), unlike the methods discussed below, which can have an uncertainty of 10%, or more. The body fat percentage is commonly calculated from one of two formulas (ρ represents density in g/cm3):
Bioelectrical impedance analysis
The bioelectrical impedance analysis (BIA) method is a lower-cost (from less than one to several hundred US dollars in 2006
Each (bare) foot may be placed on an electrode, with the current sent up one leg, across the abdomen and down the other leg. (For convenience, an instrument which must be stepped on will also measure weight.) Alternatively, an electrode may be held in each hand; calculation of fat percentage uses the weight, so that must be measured with scales and entered by the user. The two methods may give different percentages, without being inconsistent, as they measure fat in different parts of the body. More sophisticated instruments for domestic use are available with electrodes for both feet and hands.
There is little scope for technician error as such, but factors such as eating, drinking and exercising must be controlled[16] since hydration level is an important source of error in determining the flow of the electric current to estimate body fat. The instructions for use of instruments typically recommended not making measurements soon after drinking or eating or exercising, or when dehydrated. Instruments require details such as sex and age to be entered, and use formulae taking these into account; for example, men and women store fat differently around the abdomen and thigh region.
Different BIA analysers may vary. Population-specific equations are available for some instruments, which are only reliable for specific ethnic groups, populations, and conditions. Population-specific equations may not be appropriate for individuals outside of specific groups.[17]
Anthropometric methods
There exist various anthropometric methods for estimating body fat. The term anthropometric refers to measurements made of various parameters of the human body, such as circumferences of various body parts or thicknesses of skinfolds. Most of these methods are based on a statistical model. Some measurements are selected, and are applied to a population sample. For each individual in the sample, the method's measurements are recorded, and that individual's body density is also recorded, being determined by, for instance, under-water weighing, in combination with a multi-compartment body density model. From this data, a formula relating the body measurements to density is developed.
Because most anthropometric formulas such as the Durnin-Womersley skinfold method,[18] the Jackson-Pollock skinfold method, and the US Navy circumference method, actually estimate body density, not body fat percentage, the body fat percentage is obtained by applying a second formula, such as the Siri or Brozek described in the above section on density. Consequently, the body fat percentage calculated from skin folds or other anthropometric methods carries the cumulative error from the application of two separate statistical models.
These methods are therefore inferior to a direct measurement of body density and the application of just one formula to estimate body fat percentage. One way to regard these methods is that they trade accuracy for convenience, since it is much more convenient to take a few body measurements than to submerge individuals in water.
The chief problem with all statistically derived formulas is that in order to be widely applicable, they must be based on a broad sample of individuals. Yet, that breadth makes them inherently inaccurate. The ideal statistical estimation method for an individual is based on a sample of similar individuals. For instance, a skinfold based body density formula developed from a sample of male collegiate rowers is likely to be much more accurate for estimating the body density of a male collegiate rower than a method developed using a sample of the general population, because the sample is narrowed down by age, sex, physical fitness level, type of sport, and lifestyle factors. On the other hand, such a formula is unsuitable for general use.
Skinfold methods
The skinfold estimation methods are based on a skinfold test, also known as a pinch test, whereby a
Skinfold-based body fat estimation is sensitive to the type of caliper used, and technique. This method also only measures one type of fat: subcutaneous adipose tissue (fat under the skin). Two individuals might have nearly identical measurements at all of the skin fold sites, yet differ greatly in their body fat levels due to differences in other body fat deposits such as visceral adipose tissue: fat in the abdominal cavity. Some models partially address this problem by including age as a variable in the statistics and the resulting formula. Older individuals are found to have a lower body density for the same skinfold measurements, which is assumed to signify a higher body fat percentage. However, older, highly athletic individuals might not fit this assumption, causing the formulas to underestimate their body density.
Ultrasound
Ultrasound is used extensively to measure tissue structure and has proven to be an accurate technique to measure subcutaneous fat thickness.[22] A-mode and B-mode ultrasound systems are now used and both rely on using tabulated values of tissue sound speed and automated signal analysis to determine fat thickness. By making thickness measurements at multiple sites on the body you can calculate the estimated body fat percentage.[23][24] Ultrasound techniques can also be used to directly measure muscle thickness and quantify intramuscular fat. Ultrasound equipment is expensive, and not cost-effective solely for body fat measurement, but where equipment is available, as in hospitals, the extra cost for the capability to measure body fat is minimal.[16]
Height and circumference methods
There also exist formulas for estimating body fat percentage from an individual's weight and girth measurements. For example, the U.S. Navy circumference method compares abdomen or waist and hips measurements to neck measurement and height and other sites claim to estimate one's body fat percentage by a conversion from the body mass index. In the U.S. Navy, the method is known as the "rope and choke." There is limited information, however, on the validity of the "rope and choke" method because of its universal acceptance as inaccurate and easily falsified.[citation needed]
The
Methods using circumference have little acceptance outside the Department of Defense due to their negative reputation in comparison to other methods. The method's accuracy becomes an issue when comparing people with different body compositions, those with larger necks artificially generate lower body fat percentage calculations than those with smaller necks.
From BMI
Body fat can be estimated from
Body fat may be estimated from the body mass index by formulae derived by Deurenberg and co-workers. When making calculations, the relationship between densitometrically determined body fat percentage (BF%) and BMI must take age and sex into account. Internal and external cross-validation of the prediction formulas showed that they gave valid estimates of body fat in males and females at all ages. In obese subjects, however, the prediction formulas slightly overestimated the BF%. The prediction error is comparable to the prediction error obtained with other methods of estimating BF%, such as skinfold thickness measurements and bioelectrical impedance. The formula for children is different; the relationship between BMI and BF% in children was found to differ from that in adults due to the height-related increase in BMI in children aged 15 years and younger.[27]
- where sex is 0 for females and 1 for males.
However – contrary to the aforementioned internal and external cross-validation –, these formulae definitely proved unusable at least for adults and are presented here illustratively only.
Still, the following formula designed for adults proved to be much more accurate at least for adults:[28]
- where, again, gender (sex) is 0 if female and 1 if male to account for the lower body fat percentage of men.
Other indices may be used; the body adiposity index was said by its developers to give a direct estimate of body fat percentage, but statistical studies found this not to be so.[29]
See also
- Adipose tissue
- Andreas Münzer
- Body water
- Classification of obesity
- Lizzie Velásquez, a woman with "zero percent body fat"
- Relative Fat Mass (RFM)
References
- PMID 12037649.
- ^ "QuickStats: Mean Percentage Body Fat, by Age Group and Sex – National Health and Nutrition Examination Survey, United States, 1999–2004". cdc.gov.
- S2CID 5230674.
- ^ Fryar, Carroll, Afful (5 February 2021). "Prevalence of Overweight, Obesity, and Severe Obesity Among Adults Aged 20 and Over: United States, 1960–1962 Through 2017–2018".
{{cite journal}}
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(help) - S2CID 25043685. Retrieved July 29, 2021.
- ISBN 978-1-4081-0538-2. Retrieved July 29, 2021.
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- S2CID 11986135.
- PMID 8614326.
- PMID 11864850.
- PMID 25607661.
- S2CID 4506987. Archived from the original(PDF) on 2019-02-22.
- PMID 6465059.
- S2CID 2191337.
- ^ Siri WE (1961). "Body composition from fluid spaces and density: Analysis of methods". In Brozek J, Henzchel A (eds.). Techniques for Measuring Body Composition. Washington: National Academy of Sciences. pp. 224–244.
- ^ ISBN 978-0-7817-7730-8.
- PMID 18778488.
- PMID 4843734.
- . In this paper the terms "skinfold caliper" and "plicometer" are used interchangeable, as in the description of Table 2
- PMID 9725657.
- ^ Bruner R (2 November 2001). "A–Z of health, fitness and nutrition". The Jerusalem Post. Archived from the original on 11 April 2013. Retrieved 21 October 2011.
- ISBN 978-0-7360-4655-8.
- S2CID 24424682.
- PMID 18408602.
- ^ "B–3" (PDF). Army Regulation 600–9: The Army Body Composition Program. Department of the Army. 28 June 2013. pp. 26–31. Archived from the original (PDF) on 7 October 2022. Retrieved 21 August 2017.
Description of circumference sites and their anatomical landmarks and technique
- ^ "Gastric Banding Surgery". UC San Diego. Archived from the original on 2011-04-15. Retrieved 2011-02-10.
- PMID 2043597.
- ^ How to Convert BMI to Body Fat Percentage. By Jessica Bruso with reference to a study published in the International Journal of Obesity and Related Metabolic Disorders in 2002. July 18, 2017.
- PMID 21862743.
External links
- Gallagher D, Heymsfield SB, Heo M, Jebb SA, Murgatroyd PR, Sakamoto Y (September 2000). "Healthy percentage body fat ranges: an approach for developing guidelines based on body mass index". The American Journal of Clinical Nutrition. 72 (3): 694–701. PMID 10966886.