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+<!--#set var="TITLE" value="Gait in Aging and Disease Database"-->
+<!--#include virtual="/head.shtml"-->
+
+
+<table bgcolor="lightblue">
+<tr><td>
+<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>
+</table>
+
+<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>.
+
+<!--#include virtual="/footer.shtml"-->
+</body>
+</html>