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Plot Agonist-Antagonist Co-Activation

Source: R/emg-plot.R
plotCoactivation.Rd

Overlays the agonist and antagonist envelopes and shades their common (co-contraction) area, annotated with the co-contraction index.

Usage

plotCoactivation(
  x,
  agonist,
  antagonist,
  method = c("falconer_winter", "rudolph", "frost"),
  normalize = TRUE,
  assay_name = NULL
)

Arguments

x

A PhysioExperiment object of EMG envelopes.

agonist, antagonist

Channel index or label of the two muscles.

method

Co-contraction index for the annotation (see emgCoContraction()).

normalize

Peak-normalize each channel before plotting (default: TRUE).

assay_name

Input assay name (default: first assay).

Value

A ggplot object.

References

Falconer, K. & Winter, D.A. (1985). "Quantitative assessment of co-contraction at the ankle joint in walking." Electromyography and Clinical Neurophysiology, 25(2-3), 135-149.

See also

emgCoContraction()

Examples

t <- seq_len(1000)
a <- exp(-((t - 400) / 120)^2); b <- exp(-((t - 600) / 120)^2)
pe <- PhysioExperiment(assays = list(env = cbind(a, b)),
  colData = S4Vectors::DataFrame(label = c("TA", "GAS")), samplingRate = 1000)
plotCoactivation(pe, "TA", "GAS")