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<!DOCTYPE HTML>
<!--
Hyperspace by HTML5 UP
html5up.net | @ajlkn
Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)
-->
<html>
<head>
<title>How FormFit works</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" />
<link rel="stylesheet" href="assets/css/main.css" />
<noscript><link rel="stylesheet" href="assets/css/noscript.css" /></noscript>
</head>
<body class="is-preload">
<!-- Header -->
<header id="header">
<a href="index.html" class="title">FormFit</a>
<nav>
<ul>
<li><a href="index.html">Home</a></li>
<li><a href="description.html">How to use FormFit</a></li>
<li><a href="techPage.html" class="active">How FormFit works</a></li>
</ul>
</nav>
</header>
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<div id="wrapper">
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<section id="main" class="wrapper">
<div class="inner">
<h1 class="major">How FormFit works</h1>
<!-- Text -->
<section>
<h3>FormFit takes accelerometer data during your run and uses it to identify common running form issues.</h3>
<br/>
</section>
<h2>Pelvic Tilt</h2>
<p>Anterior pelvic tilt -- a forward rotation of the hips -- is widely associated with back pain, especially when running.
Fixing this tilt can help with a variety of other running form issues. The pictures below show a comparison of a person with an upright form,
versus a person tilting forward. As you tilt forward, the component of acceleration in the Z axis increases.
</p>
<div class="row">
<div class="column">
<img src="images/vienna_notilt_coord(1).jpg" alt="" width=300 height=250>
<figcaption><i>Standing with no tilt</i></figcaption>
</div>
<div class="column">
<img src="images/vienna_tilt_coord.jpg" alt="" width=300 height=250>
<figcaption><i>Standing with tilted form</i></figcaption>
</div>
</div>
<br/>
<p>FormFit uses data from the accelerometer on
the lower back to identify changes in Z-axis acceleration that indicate a pelvic tilt. Our algorithm finds the average magnitude of the acceleration in the Z-axis and compares it
to a threshold that we’ve found to be indicative of tilting.
</p>
<center><img src="images/tilt_detect.png" alt="" width=600 height=440><figcaption><i>Output of the tilt detection program</i></figcaption></center>
<br/>
<h2>Stride Frequency</h2>
<p>Overstriding is associated with an increased risk of shin splints -- those with a longer stride tend to have their foot farther out in front of them when they land, increasing risk of heel striking and increasing strain on the shins. One way to help this is to shorten the stride and increase stride frequency. FormFit detects your stride frequency so you can work to increase it.
Our algorithm takes the Fourier transform of the X-acceleration of the ankle accelerometer and finds the most prominent frequency -- this corresponds to the strides per second of one leg. This number is then converted to strides per minute, the metric most commonly used to describe stride rate in the running community.
</p>
<center><img src="images/stride_freq.png" alt="" width=600 height=440><figcaption><i>Output of the stride frequency program</i></figcaption></center>
<br/>
<h2>Heel Strike</h2>
<p>When running, landing sharply on your heel can cause unnecessary stress on your shins and knees, causing damage over time.
The gifs below show a person running softly and then running while heel striking.</p>
<div class="row">
<div class="column">
<img src="images/NoStrike.gif" alt="" width=340 height=250>
<figcaption><i>Running gently on the balls of the feet</i></figcaption>
</div>
<div class="column">
<img src="images/Strike.gif" alt="" width=340 height=250>
<figcaption><i>Striking the heel forcefully when running</i></figcaption>
</div>
</div>
<br/>
<p>FormFit detects these “heel strikes” using accelerometer data from the ankle, comparing the spike in acceleration caused by the foot landing to a threshold magnitude that our testing has found to be associated with heel striking. If these exaggerated acceleration peaks are found to be occurring frequently at a rate similar to your stride rate, our algorithm reports that you have been heel striking.</p>
<center><img src="images/strike_detect.png" alt="" width=600 height=440></center>
</section>
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<li>© 2018 Lauren Anfenson & Vienna Scheyer</li><li>Design: <a href="http://html5up.net">HTML5 UP</a></li>
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