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+<h1>Gait in Aging and Disease Database</h1>
+
+<p><strong>Jeffrey Hausdorff</strong>, <strong>Patrick Purdon</strong>, <strong>Chung-Kang Peng</strong></p>
+<p><strong>Published:</strong> Oct. 13, 2000. Version: 1.0.0</p>
+
+<h2>Citation</h2>
+<p>
+Please include the standard citation for PhysioNet:
+<br>
+Goldberger, A., Amaral, L., Glass, L., Hausdorff, J., Ivanov, P. C., Mark, R., ... & Stanley, H. E. (2000).
+PhysioBank, PhysioToolkit, and PhysioNet: Components of a new research resource for complex physiologic signals.
+<em>Circulation</em> [Online]. 101 (23), pp. e215–e220.
+</p>
+
+<h2>Data Description</h2>
+<p>
+Walking stride interval time series are included for 15 subjects:
+<ul>
+  <li>5 healthy young adults (ages 23–29)</li>
+  <li>5 healthy old adults (ages 71–77)</li>
+  <li>5 older adults with Parkinson's disease (ages 60–77)</li>
+</ul>
+</p>
+
+<p>
+The file names indicate subject group: <strong>o</strong> for old, <strong>y</strong> for young, and <strong>pd</strong> for Parkinson’s disease.
+For young and old, the filename also includes the age in years.
+</p>
+
+<p>
+Subjects walked continuously on level ground along an obstacle-free path.
+Stride intervals were measured using ultra-thin, force-sensitive resistors placed inside the shoe.
+The analog signal was sampled at 300 Hz using a 12-bit A/D converter with an ankle-worn microcomputer.
+Time between foot strikes was then automatically calculated using a validated method consistent with force-platform measurements.
+</p>
+
+<p>
+Data collection:
+<ul>
+  <li>Healthy subjects walked for 15 minutes in a circular path</li>
+  <li>Parkinson’s subjects walked for 6 minutes in a hallway</li>
+</ul>
+</p>
+
+<h2>Files</h2>
+<p>
+You may download:
+<ul>
+  <li><code>gait-data.tar</code> (150K) - full dataset as a UNIX tar archive</li>
+  <li><code>gait-data.tar.gz</code> (47K) - compressed version</li>
+</ul>
+</p>
+
+<p>
+Each file includes two columns:
+<ul>
+  <li><strong>Column 1:</strong> Time (seconds)</li>
+  <li><strong>Column 2:</strong> Stride interval (seconds)</li>
+</ul>
+</p>
+
+<p>
+Data is also available in PhysioBank format with annotation (<code>.str</code>) and header (<code>.hea</code>) files,
+for viewing or analysis using PhysioToolkit.
+</p>
+
+<h2>References</h2>
+<ul>
+  <li>JM Hausdorff et al., <em>Fractal dynamics of human gait</em>, J Appl Physiol 80:1448–1457, 1996.</li>
+  <li>JM Hausdorff et al., <em>Altered fractal dynamics of gait</em>, J Appl Physiol 82:262–269, 1997.</li>
+  <li>JM Hausdorff et al., <em>Gait variability and basal ganglia disorders</em>, Mov Disord 13:428–437, 1998.</li>
+</ul>
+
+<h2>More Information</h2>
+<p>
+A mini-tutorial and database introduction is available on the Reylab website.
+For more details, please contact JM Hausdorff.
+</p>