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<p>

This "mini-collection" of human gait data was constructed as a

teaching resource for an intensive course ("The Modern Science of

Human Aging", conducted at MIT in October, 1999 under the auspices of

<a href="http://www.necsi.org/" target="other">NECSI</a>).  As such,

this specific collection is not intended for basic research or

publications.  It may be useful, however, in other classroom or

tutorial settings, and for self-guided explorations into the world of

biologic complexity.  </td></tr>

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<p>

Walking stride interval time series included are from 15 subjects: 5

healthy young adults (23 - 29 years old), 5 healthy old adults (71 - 77

years old), and 5 older adults (60 - 77 years old) with Parkinson's

disease. The file name indicates old (o), young (y) or Parkinson's

disease (pd). For the old and young subjects, the age (in years) is also

included in the filename.

<p>

You may download <a href="gait-data.tar">gait-data.tar</a>

<nobr>(<!--#fsize file="gait-data.tar" -->),</nobr> a UNIX tar archive

of this entire mini-collection, also available in gzip-compressed form as

<a href="gait-data.tar.gz">gait-data.tar.gz</a>

<nobr>(<!--#fsize file="gait-data.tar.gz" -->).</nobr>

(WinZip users, please read this important

<a href="/faq.shtml#tar-gz">note</a>.)

If you prefer, you may download individual recordings:

<center><table width= 80%>

<tr><td><b>Old</b></td>

<td><b>Parkinson's</b></td>

<td><b>Young</b></td></tr>

<tr><td><a href="o1-76-si.txt">o1-76-si.txt</a></td>

<td><a href="pd1-si.txt">pd1-si.txt</a></td>

<td><a href="y1-23-si.txt">y1-23-si.txt</a></td></tr>

<tr><td><a href="o2-74-si.txt">o2-74-si.txt</a></td>

<td><a href="pd2-si.txt">pd2-si.txt</a></td>

<td><a href="y2-29-si.txt">y2-29-si.txt</a></td></tr>

<tr><td><a href="o3-75-si.txt">o3-75-si.txt</a></td>

<td><a href="pd3-si.txt">pd3-si.txt</a></td>

<td><a href="y3-23-si.txt">y3-23-si.txt</a></td></tr>

<tr><td><a href="o4-77-si.txt">o4-77-si.txt</a></td>

<td><a href="pd4-si.txt">pd4-si.txt</a></td>

<td><a href="y4-21-si.txt">y4-21-si.txt</a></td></tr>

<tr><td><a href="o5-71-si.txt">o5-71-si.txt</a></td>

<td><a href="pd5-si.txt">pd5-si.txt</a></td>

<td><a href="y5-26-si.txt">y5-26-si.txt</a></td></tr>

</table></center>

<p>

For each subject, two columns of data are included. The first column

is time (in seconds) and the second is the stride interval (variously

known as stride time, gait cycle duration, and time between successive

heel strikes of the same foot). 

<p>

The same data are also available as standard PhysioBank-format annotation

(.str) and header (.hea) files, for viewing or analysis using

<a href="/physiotools/">PhysioToolkit software</a> from this site:

<center><table width= 80%>

<tr><td><b>Old</b></td>

<td><b>Parkinson's</b></td>

<td><b>Young</b></td></tr>

<tr><td><a href="o1_76_si.str">o1_76_si.str</a></td>

<td><a href="pd1_si.str">pd1_si.str</a></td>

<td><a href="y1_23_si.str">y1_23_si.str</a></td></tr>

<tr><td><a href="o1_76_si.hea">o1_76_si.hea</a></td>

<td><a href="pd1_si.hea">pd1_si.hea</a></td>

<td><a href="y1_23_si.hea">y1_23_si.hea</a></td></tr>

<tr><td>______________</td><td>______________</td><td>______________</td></tr>

<tr><td><a href="o2_74_si.str">o2_74_si.str</a></td>

<td><a href="pd2_si.str">pd2_si.str</a></td>

<td><a href="y2_29_si.str">y2_29_si.str</a></td></tr>

<tr><td><a href="o2_74_si.hea">o2_74_si.hea</a></td>

<td><a href="pd2_si.hea">pd2_si.hea</a></td>

<td><a href="y2_29_si.hea">y2_29_si.hea</a></td></tr>

<tr><td>______________</td><td>______________</td><td>______________</td></tr>

<tr><td><a href="o3_75_si.str">o3_75_si.str</a></td>

<td><a href="pd3_si.str">pd3_si.str</a></td>

<td><a href="y3_23_si.str">y3_23_si.str</a></td></tr>

<tr><td><a href="o3_75_si.hea">o3_75_si.hea</a></td>

<td><a href="pd3_si.hea">pd3_si.hea</a></td>

<td><a href="y3_23_si.hea">y3_23_si.hea</a></td></tr>

<tr><td>______________</td><td>______________</td><td>______________</td></tr>

<tr><td><a href="o4_77_si.str">o4_77_si.str</a></td>

<td><a href="pd4_si.str">pd4_si.str</a></td>

<td><a href="y4_21_si.str">y4_21_si.str</a></td></tr>

<tr><td><a href="o4_77_si.hea">o4_77_si.hea</a></td>

<td><a href="pd4_si.hea">pd4_si.hea</a></td>

<td><a href="y4_21_si.hea">y4_21_si.hea</a></td></tr>

<tr><td>______________</td><td>______________</td><td>______________</td></tr>

<tr><td><a href="o5_71_si.str">o5_71_si.str</a></td>

<td><a href="pd5_si.str">pd5_si.str</a></td>

<td><a href="y5_26_si.str">y5_26_si.str</a></td></tr>

<tr><td><a href="o5_71_si.hea">o5_71_si.hea</a></td>

<td><a href="pd5_si.hea">pd5_si.hea</a></td>

<td><a href="y5_26_si.hea">y5_26_si.hea</a></td></tr>

</table></center>

<p>

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.

<p>

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.

<p>

The following references may be of interest:

<p>

JM Hausdorff, PL Purdon, CK Peng, Z Ladin, JY Wei,

AL Goldberger. Fractal dynamics of human gait: stability of

long-range correlations in stride interval fluctuations.

<i>J Appl Physiol</i> <b>80</b>:1448-1457, 1996.

<p>

JM Hausdorff, SL Mitchell, R Firtion, CK. Peng, ME Cudkowicz, JY Wei

and AL Goldberger.  Altered fractal dynamics of gait: reduced stride

interval correlations  with aging and Huntington's disease.

<i>J Appl Physiol</i> <b>82</b>:262-269, 1997.

<p>

JM Hausdorff, ME Cudkowicz, R Firtion, JY Wei, AL Goldberger.  Gait

variability and basal ganglia disorders: stride-to-stride variations

of gait cycle timing in Parkinson's and Huntington's disease. 

<i>Mov Disord</i> <b>13</b>:428-437, 1998.

<p> On the Reylab web site, a <a

href="http://reylab.bidmc.harvard.edu/DynaDx/"

target="other">mini-tutorial</a>, including an introduction to this

database, is available.  For further information, please contact <a

href="mailto:jhausdor@caregroup.harvard.edu">JM Hausdorff</a>.

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