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<p>This &ldquo;mini-collection&rdquo; of human heart rate 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://necsi.edu/">NECSI</a>).  As such, this specific collection is

not intended for basic research or publications, for which the <a

href="../">complete database</a>, also available here, may be better suited.

It may be useful, however, in other classroom or tutorial settings, and for

self-guided explorations into the world of biologic complexity.</p>

</div>

<p>

This collection consists of 10 heart beat time series: 5 young subjects

(Y1.txt, Y2.txt, etc) and 5 elderly subjects (O1.txt, O2.txt, etc) from

the <a href="../">Fantasia Database</a>.

You may download <a href="heartbeat.tar">heartbeat.tar</a>&nbsp;(<!--#fsize file="heartbeat.tar" -->),&nbsp;a UNIX tar archive

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

<a href="heartbeat.tar.gz">heartbeat.tar.gz</a>&nbsp;(<!--#fsize file="heartbeat.tar.gz" -->).  If you prefer,

you may download individual recordings:

<div class="edbtable">

<table  style="width: 60%;">

<tr><th >Old</th>

<th >Young</th></tr>

<tr><td><a href="O1.txt">O1.txt</a>

(<a href="o1.hea">o1.hea</a>, <a href="o1.qrs">o1.qrs</a>)</td>

<td><a href="Y1.txt">Y1.txt</a>

(<a href="y1.hea">y1.hea</a>, <a href="y1.qrs">y1.qrs</a>)</td>

</tr>

<tr><td><a href="O2.txt">O2.txt</a>

(<a href="o2.hea">o2.hea</a>, <a href="o2.qrs">o2.qrs</a>)</td>

<td><a href="Y2.txt">Y2.txt</a>

(<a href="y2.hea">y2.hea</a>, <a href="y2.qrs">y2.qrs</a>)</td>

</tr>

<tr><td><a href="O3.txt">O3.txt</a>

(<a href="o3.hea">o3.hea</a>, <a href="o3.qrs">o3.qrs</a>)</td>

<td><a href="Y3.txt">Y3.txt</a>

(<a href="y3.hea">y3.hea</a>, <a href="y3.qrs">y3.qrs</a>)</td>

</tr>

<tr><td><a href="O4.txt">O4.txt</a>

(<a href="o4.hea">o4.hea</a>, <a href="o4.qrs">o4.qrs</a>)</td>

<td><a href="Y4.txt">Y4.txt</a>

(<a href="y4.hea">y4.hea</a>, <a href="y4.qrs">y4.qrs</a>)</td>

</tr>

<tr><td><a href="O5.txt">O5.txt</a>

(<a href="o5.hea">o5.hea</a>, <a href="o5.qrs">o5.qrs</a>)</td>

<td><a href="Y5.txt">Y5.txt</a>

(<a href="y5.hea">y5.hea</a>, <a href="y5.qrs">y5.qrs</a>)</td>

</td></tr>

</table>

</div>

<p>

Records <tt>O1</tt> - <tt>O5</tt> and <tt>Y1</tt> - <tt>Y5</tt> of this subset

correspond to records <tt>f1o01</tt> - <tt>f1o05</tt> and <tt>f1y01</tt> -

<tt>f1y05</tt> of the Fantasia Database, which also includes the ECG and

respiration signals for these recordings.</p>

<p>

Each <tt>.txt</tt> file contains one column of data, consisting of interbeat

intervals (in seconds).  The <tt>.hea</tt> (text header) and <tt>.qrs</tt>

(binary annotation) files contain the same data as in the <tt>.txt</tt> files,

written in the standard formats used for other PhysioBank databases.  The

<tt>.tar</tt> and <tt>.tar.gz</tt> archives include only the <tt>.txt</tt>

files.  The length of each recording is approximately 2 hours.</p>

<p>

Five young (21 - 34 years old) and five elderly (68 - 81 years old)

rigorously-screened healthy subjects underwent 120 minutes of

continuous supine resting while continuous electrocardiographic (ECG)

signals were collected.</p>

<p>

All subjects remained in a resting state in sinus rhythm while

watching the movie

<a href="http://imdb.com/Title?0032455" target="other"><i>Fantasia</i></a> (Disney, 1940) to help maintain wakefulness. The

continuous ECG was digitized at 250 Hz. Each heartbeat was annotated

using an automated arrhythmia detection algorithm, and each beat

annotation was verified by visual inspection. The R-R interval

(interbeat interval) time series for each subject was then computed.</p>

<h2>Reference</h2>

<p>

These 10 time series form a subset of the <a href="../">complete database</a>

described in:</p>

<div class="reference">

Iyengar N, Peng C-K, Morin R, Goldberger AL, Lipsitz LA. 

Age-related alterations in the fractal scaling of cardiac

interbeat interval dynamics. <i>Am J Physiol</i> 1996;<b>271</b>:1078-1084.

</div> <!-- end reference -->

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