Relative and Absolute Measurements

Validation of a bioelectrical impedance scale for the estimation of body fat in adolescents

Revista Brasileira de Fisiologia do Exercício ◽

10.33233/rbfex.v19i5.4106 ◽

2020 ◽

Vol 19 (5) ◽

pp. 369

Author(s):

Andreia Pelegrini ◽

André De Araújo Pinto ◽

Hector Cris Colares De Angelo ◽

Gaia Salvador Claumann ◽

Diego Augusto Santos Silva ◽

...

Keyword(s):

Body Fat ◽

Bioelectrical Impedance ◽

Air Displacement Plethysmography ◽

Overweight Adolescents ◽

The Absolute ◽

Absolute Measurements

Several different instruments available on the market have been used for the estimation of body fat. However, many of these instruments have not been compared with reference criteria to verify their true accuracy. This study aimed to verify the validity of a bioelectrical impedance scale (OMRON-514C) for the estimation of body fat. Forty-four overweight adolescents (25 females) participated in this study, with an average age of 12.3 ± 1.1 years. All were submitted to body fat evaluations by air displacement plethysmography and bioelectrical impedance. Higher values of relative and absolute body fat were estimated by bioelectrical impedance compared to plethysmography (p < 0.05). There was no correlation between the relative body fat measurements between the two methods (r = 0.185; p = 0.228). The absolute measurements of body fat were correlated (r = 0.497, p = 0.001). Both in the measurements of relative (p= 0.034) and absolute body fat (p = 0.021), the bioelectrical impedance overestimated the measured values. Thus, in adolescents with characteristics similar to the present study, the estimate of body fat by the bioelectrical impedance (OMRON-514C) should be used with caution.Keywords: plethysmography, bioelectrical impedance, adolescents, overweight.

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Absolute measurements of the O+C2H4 rate coefficient

Symposium (International) on Combustion ◽

10.1016/s0082-0784(69)80411-x ◽

1969 ◽

Vol 12 (1) ◽

pp. 289-299 ◽

Cited By ~ 10

Author(s):

A.A. Westenberg ◽

N. deHaas

Keyword(s):

Rate Coefficient ◽

Absolute Measurements

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Absolute measurements of light emission from CO+2 and CO in the interaction of He(23S) with CO2

Journal of Quantitative Spectroscopy and Radiative Transfer ◽

10.1016/0022-4073(72)90051-9 ◽

1972 ◽

Vol 12 (3) ◽

pp. 371-378 ◽

Cited By ~ 24

Author(s):

T.S. Wauchop ◽

H.P. Broida

Keyword(s):

Light Emission ◽

Absolute Measurements

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Absolute measurements of the frequency of an He—Ne/CH4standard over a decade

Quantum Electronics ◽

10.1070/qe1996v026n12abeh000878 ◽

1996 ◽

Vol 26 (12) ◽

pp. 1081-1084 ◽

Cited By ~ 4

Author(s):

Yurii S Domnin ◽

Leonid N Kopylov ◽

A N Malimon ◽

V P Tenishev ◽

P S Shumyatskii

Keyword(s):

Absolute Measurements

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A standard measuring machine

Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character ◽

10.1098/rspa.1912.0093 ◽

1912 ◽

Vol 87 (597) ◽

pp. 385-390

Keyword(s):

National Physical Laboratory ◽

Standard Measuring ◽

Physical Laboratory ◽

Accurate Comparison ◽

Measuring Machine ◽

Regular Work ◽

Absolute Measurements ◽

Line Standard

In some physical researches it is required to measure the dimensions of a regular solid, whether parallel-sided, cylindrical, or spherical-ended, with the greatest possible accuracy. Again, in the regular work of a metrology bureau, accurate comparison of the size of an end-standard of length with reference to a line-standard is required. Until 1906 the only apparatus available for these purposes was the measuring machine made for comparing engineering gauges. In that year the writer described a machine based on the principle of electric touch, which was much more delicate than the older mechanical machines. It also had facilities for exploring the solid under test, to prove its accuracy of figure. This machine has been installed and used in the National Physical Laboratory since 1909. Improvements in it were described later. The present paper gives an outline of an improved machine of the same type embodying the experience gained in using the 1906 machine. The chief novelties are: (1) greater strength in the supporting parts, and consequent rigidity of the whole apparatus; (2) larger and much improved table to carry the solid under test; (3) improved measuring-ends; (4) an innovation for making absolute measurements, whereby the line-standard moves but the reading microscope remains fixed; (5) side girders to relieve the bed of load and so reduce friction, abrasion, and strain.

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