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#' Demo data
#'
#' A dataset containing the lactate and heart rate data collected from a step-incremental
#' test as an example
#'
#' @format A data frame with 8 rows and 5 variables:
#' \describe{
#' \item{step}{the number of the step, starting at zero for the baseline.}
#' \item{length}{the length of each step.}
#' \item{intensity}{the intensity performed on each step (in this case in watts).}
#' \item{lactate}{the blood lactate concentration.}
#' \item{heart_rate}{the heart rate associated with that step.}
#' }
"demo_data"
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