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Calculate additional variables related to body mass for cardiopulmonary exercise testing data

Source: R/add_bodymass.R
add_bodymass.Rd

add_bodymass() adds body mass-related variables to processed gas exchange data.

Usage

add_bodymass(data, bodymass = NULL)

Arguments

data

A data.frame of the class spiro containing the gas exchange data. Usually the output of a spiro call.

bodymass

A numeric value to manually set the participant's body mass. Defaults to NULL to use body mass data from the file's meta data. Set to NA to ignore the meta data without setting a new body mass.

Value

A data.frame of the class spiro containing the cardiopulmonary exercise testing data including variables related to body mass.

Details

Based on an individual's body mass, relative oxygen uptake (VO2_rel) and carbon dioxide output (VCO2_rel) are calculated. For running protocols, running economy (RE) is calculated.

Examples

# get example file
file <- spiro_example("zan_gxt")

s <- spiro(file)
out <- add_bodymass(s, bodymass = 65.3)
head(out)
#>   load step time    VO2   VCO2    RR   VT    VE HR PetO2 PetCO2 VO2_rel
#> 1    0    0    1     NA     NA    NA   NA    NA NA    NA     NA      NA
#> 2    0    0    2     NA     NA    NA   NA    NA NA    NA     NA      NA
#> 3    0    0    3     NA     NA    NA   NA    NA NA    NA     NA      NA
#> 4    0    0    4 399.08 323.70 13.94 0.77 10.72 NA    NA     NA    6.11
#> 5    0    0    5 409.83 330.26 14.50 0.74 10.66 NA    NA     NA    6.28
#> 6    0    0    6 420.58 336.82 15.06 0.71 10.60 NA    NA     NA    6.44
#>   VCO2_rel RE  RER  CHO   FO
#> 1       NA NA   NA   NA   NA
#> 2       NA NA   NA   NA   NA
#> 3       NA NA   NA   NA   NA
#> 4     4.96 NA 0.81 0.20 0.13
#> 5     5.06 NA 0.81 0.19 0.13
#> 6     5.16 NA 0.80 0.19 0.14