Calculate complete body composition (Mid-level - Main function) — calculate_body

Main function that calculates all body composition components and energy density from weight and processed parameters

Usage

calculate_body_composition(weight, processed_composition_params)

Arguments

weight: Total wet weight (g)
processed_composition_params: List with processed composition parameters

Value

A named list with 13 elements describing the body composition:

total_weight: Numeric. Total wet weight (g), equal to weight.
water_g: Numeric. Water content (g).
protein_g: Numeric. Protein content (g), estimated from water via Breck (2014) regression.
ash_g: Numeric. Ash content (g), estimated from water via Breck (2014) regression.
fat_g: Numeric. Fat content (g), calculated by subtraction and bounded to [0, max_fat_fraction * weight].
water_fraction: Numeric. Water as a fraction of total weight.
protein_fraction: Numeric. Protein as a fraction of total weight.
ash_fraction: Numeric. Ash as a fraction of total weight.
fat_fraction: Numeric. Fat as a fraction of total weight.
energy_density: Numeric. Energy density (J/g wet weight).
total_energy: Numeric. Total body energy (J).
total_fraction: Numeric. Sum of all four fractions; should be close to 1.
balanced: Logical. TRUE if total_fraction is within 0.05 of 1.

Returns create_empty_composition() when weight <= 0.

Examples

params <- list(water_fraction = 0.72, fat_energy = 36450,
               protein_energy = 17990, max_fat_fraction = 0.30)
calculate_body_composition(weight = 100,
                           processed_composition_params = params)
#> $total_weight
#> [1] 100
#> 
#> $water_g
#> [1] 72
#> 
#> $protein_g
#> [1] 15.48219
#> 
#> $ash_g
#> [1] 1.787121
#> 
#> $fat_g
#> [1] 10.73069
#> 
#> $water_fraction
#> [1] 0.72
#> 
#> $protein_fraction
#> [1] 0.1548219
#> 
#> $ash_fraction
#> [1] 0.01787121
#> 
#> $fat_fraction
#> [1] 0.1073069
#> 
#> $energy_density
#> [1] 6696.582
#> 
#> $total_energy
#> [1] 669658.2
#> 
#> $total_fraction
#> [1] 1
#> 
#> $balanced
#> [1] TRUE
#>