Petroski.2sites {bodycomp}

Percent Body Fat Estimates Using Petroski (1995).

Description

This function calculates the percent body mass estimates based on 2 sites skinfold measurements using the equations of Petroski (1995). Population Specifications: Brazilian Males aged 18-66.

Usage

Petroski.2sites(TR, MA, Age, Equation, Output.format)

Arguments

TR

a value or a vector representing Triceps Skinfold measurements. Direction of Fold: Vertical (midline). Anatomical Reference: Acromial process of scapula and olecranon process of ulna. Measurement: Using a tape measure, distance between lateral projection of acromial process and inferior margin of olecranon process is measured on lateral aspect of arm with elbow flexed 90°. Midpoint is marked on lateral side of arm. Fold is lifted 1 cm above marked line on posterior aspect of arm. Caliper is applied at marked level.

MA

Site: a value or a vector representing Midaxillary Skinfold measurements. Direction of Fold: Oblique (Adapted from Author). Anatomical Reference: Xiphisternal junction (point where costal cartilage of ribs 5-6 articulates with sternum, slightly above inferior tip of xiphoid process). Measurement: Fold is taken on midaxillary line at level of xiphisternal junction. Petroski choose modifications in the verification of the AM fold for obliques because it's most used procedures in Brazil.

Age

a value or a vector representing the age (in years) from subject assessed.

Equation

desired estimation equation. Two possible choices: 1 or 2.

Output.format

desired output information. Tree possible choices: 0, 1 or 2.

Details

Equation: Use 1 for Siri (1961) equation or 2 for Brozek et al. (1963) equation. Output.format: Use 0 to display Percent Body Fat (%BF) and Body Density (BD) together; use 1 to display %BF only; use 2 to display BD only.

Value

Returns a data frame with the values of the % body fat and body density from a subject assessed by skinfold measurements

References

Petroski, E. L. Desenvolvimento e validação de equações generalizadas para a estimativa da densidade corporal em adultos. 1995. Tese (Doutorado) – UFSM, Santa Maria.

Harrison GG, Buskirk ER, Carter JEL, Johnston FE, Lohman TG, Pollock ML, et al. Skinfold thicknesses and measurements technique. In: Lohman TG, Roche AF, Martorell R, editors. Anthropometric standardizing reference manual. Champaign (Illinois): Human Kinetics Books; 1991. p.55-80

International Society for the Advancement of Kinanthropometry (ISAK), 2001. International Standards for Anthropometric Assessment. (Underdale, SA, Australia.)

Eston, R. (Ed.). (2008). Kinanthropometry and Exercise Physiology Laboratory Manual: Tests, Procedures and Data: Volume One: Anthropometry (3rd ed.). Routledge. https://doi.org/10.4324/9780203868744

Siri, W. E. Body composition from fluid space and density. In: BROZEK, J.; HANSCHEL, A. (Eds.). Techniques for measuring body composition. Washing, D.C.:National Academy of Science, 1961. p. 223-224.

Brozek J., F. Grande, J. Anderson, et al. 1963. Densitometric analysis of body composition: Revision of some quantitative assumptions. Annals of the New York Academy of Sciences 110: 113-140.

Examples

# Predicting % body fat

df<- Petroski.2sites(TR = c(23,24), MA = c(34,33), Age = c(24,27), Equation = 1, Output.format = 0)