Create a Basic EMG PhysioExperiment

Generates a synthetic multi-channel EMG PhysioExperiment object with simulated muscle activity. Each channel contains baseline noise with a burst of higher-amplitude activity in the middle 40 percent of the signal (from 30 to 70 percent), mimicking a typical voluntary contraction.

Usage

make_emg(n_time = 2000, n_channels = 4, sr = 1000)

Arguments

n_time

Number of time points (default: 2000).

n_channels

Number of EMG channels (default: 4).

sr

Sampling rate in Hz (default: 1000).

Value

A PhysioExperiment object with a single "raw" assay containing simulated EMG data (time x channels matrix), channel metadata in colData, and the specified sampling rate.

References

Merletti, R. & Parker, P.A. (2004). "Electromyography: Physiology, Engineering, and Non-Invasive Applications." Wiley-IEEE Press. doi:10.1002/0471678384

See also

make_emg_contraction() for EMG with a defined contraction window, make_emg_fatigue() for EMG with fatigue progression, emgEnvelope() for extracting amplitude envelopes

Examples

pe <- make_emg()
pe
#> class: PhysioExperiment
#> dim: 2000 x 4 
#> assays(1): raw
#> samplingRate: 1000 Hz
#> channels(4): EMG1, EMG2, EMG3, EMG4
#> colData names(2): label, type
dim(SummarizedExperiment::assay(pe, "raw"))
#> [1] 2000    4