Petroski.4sites {bodycomp}

Percent Body Fat Estimates Using Petroski (1995).

Description

This function calculates the percent body mass estimates based on 4 sites skinfold measurements using the equations of Petroski (1995). Population Specifications: Brazilians Male (aged 18-66) and Female (aged 18-51).

Usage

Petroski.4sites(
  Sex,
  TR,
  SB,
  SI,
  CA,
  MA,
  TH,
  Age,
  Weight,
  Height,
  Equation,
  Output.format
)

Arguments

Sex

a value or a vector representing the sex declared by the subject. Two possible choices: 0 or 1.

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.

SB

a value or a vector representing Subscapular Skinfold measurements. Direction of Fold: Diagonal. Anatomical Reference: Inferior angle of scapula. Measurement: Fold is along natural cleavage line of skin just inferior to inferior angle of scapula, with caliper applied 1 cm below fingers.

SI

a value a vector representing Suprailiac Skinfold measurements. Direction of Fold: Oblique. Anatomical Reference: Iliac crest. Measurement: Fold is grasped posteriorly to midaxillary line and superiorly to iliac crest along natural cleavage of skin with caliper applied 1 cm below fingers.

CA

a value or a vector representing Calf Skinfold measurements. Direction of Fold: Vertical (medial aspect). Anatomical Reference: Maximal calf circumference. Measurement: Fold is lifted at level of maximal calf circumference on medial aspect of calf with knee and hip flexed to 90°.

MA

a value or a vector representing Midaxillary Skinfold measurements. Direction of Fold: Horizontal. 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.

TH

a value or a vector representing Thigh Skinfold measurements. Direction of Fold: Vertical (midlin). Anatomical Reference: Inguinal crease and patella. Measurement: Fold is lifted on anterior aspect of thigh midway between inguinal crease and proximal border of patella. Body weight is shifted to left foot and caliper is applied 1 cm below fingers.

Age

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

Weight

a value a vector representing the body weight in kilograms (kg).

Height

a value a vector representing the body stature in centimeters (cm).

Equation

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

Output.format

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

Details

Sex:Use 0 for Male and 1 for Female. 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.)

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.4sites(Sex = 1, SI = 9, CA = 17, MA = 33, TH = 12, Age = 27,
                      Weight = 70, Height = 180, Equation = 1, Output.format = 0)