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GaitMaturationDatabase
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<HEAD>





  
  

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<TITLE>Protocol</TITLE>





  
  

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<B> Next:</B> <A NAME="tex2html53" HREF="node6.html">Stride Time Dynamics</A>





  
  

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<B>Up:</B> <A NAME="tex2html51" HREF="node3.html">Methods</A>





  
  

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<B> Previous:</B> <A NAME="tex2html45" HREF="node4.html">Subjects</A>





  
  

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<BR> <P>





  
  

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<H3><A NAME="SECTION00030200000000000000">Protocol</A></H3>





  
  

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<P>





  
  

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Subjects walked at their self-determined, normal pace for eight





  
  

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minutes around a 400 m running track.  All subjects wore their own





  
  

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shoes or sneakers.  An investigator walked slightly behind each





  
  

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subject during the test.





  
  

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A recently developed





  
  

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technique was used to measure the stride time dynamics during this relatively





  
  

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long walk





  
  

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on level ground  (9,11,12). Two





  
  

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force-sensitive switches were placed inside the subject's right shoe,





  
  

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one underneath the heel of the foot and the other underneath the ball





  
  

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of the foot.  The output of these footswitches, which provides a





  
  

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measure of the force applied to the floor, was sampled at 300 Hz and





  
  

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stored in a small light-weight<IMG WIDTH=4 HEIGHT=9 ALIGN=BOTTOM ALT="tex2html_wrap_inline268" SRC="img2.png"> (5.5x2x9 cm; .1 Kg), ankle-worn recorder. 





  
  

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Subsequently, the





  
  

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recorded signal was automatically analyzed to determine initial





  
  

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contact time (heel-strike) of each stride throughout the walk, and





  
  

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hence, the stride time (the time from one heel-strike to the next





  
  

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heel-strike of the same foot) time series  (9). The average walking speed





  
  

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was determined by measuring lap time.





  
  

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