pd5si {fractal} | R Documentation

## Gait stride intervals for a patient with Parkinson's Disease

### Description

These data are from the file `pd5-si.txt` in the `gait in aging and disease' database of PhysioBank, which is a large collection of physiologic signals maintained as a public service at `http://www.physionet.org/physiobank` by NIH's National Center for Research Resources. The following quote from this Web site describes how the stride intervals were obtained. Subjects walked continuously on level ground around an obstacle-free path. The stride interval was measured using ultra-thin, force sensitive resistors placed inside the shoe. The analog force signal was sampled at 300 Hz with a 12 bit A/D converter, using an ambulatory, ankle-worn microcomputer that also recorded the data. Subsequently, the time between foot-strikes was automatically computed. The method for determining the stride interval is a modification of a previously validated method that has been shown to agree with force-platform measures, a `gold' standard.

Data were collected from the healthy subjects as they walked in a roughly circular path for 15 minutes, and from the subjects with Parkinson's disease as they walked for 6 minutes up and down a long hallway.

### See Also

`beamchaos`, `ecgrr`, `eegduke`, `lorenz`.

### Examples

    plot(pd5si)

[Package fractal version 1.0-1 Index]