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<B> Next:</B> <A NAME="tex2html43" HREF="node5.html">Protocol</A>





  
  

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<H3><A NAME="SECTION00030100000000000000">Subjects</A></H3>





  
  

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Fifty boys and girls participated in this study. Parents of children





  
  

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ages 3 to 14 years old were asked if they would be willing to have





  
  

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their child participate in this study.  If the child and parent were





  
  

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willing to participate,   





  
  

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parents were asked to provide informed written consent and to fill out a questionnaire





  
  

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describing the child's medical history.  Most children were attending





  
  

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a local day camp or a day-care center.





  
  

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Children were excluded if they had any disorders likely





  
  

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to affect gait, if they were unable to walk independently for eight





  
  

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minutes, or if they were born pre-maturely.  





  
  

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Children were classified into three age groups: 3 and 4 year olds





  
  

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(n=11), 6 and 7 year olds (n=20), and 11 to 14 year olds (n=12). Five





  
  

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year old (n=3), eight year old (n=1) and ten year old (n=3) children  were also studied.





  
  

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Height





  
  

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and body mass of the youngest, middle and oldest age groups were 105 <IMG WIDTH=12 HEIGHT=27 ALIGN=MIDDLE ALT="tex2html_wrap_inline288" SRC="img6.png"> 2,





  
  

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125 <IMG WIDTH=12 HEIGHT=27 ALIGN=MIDDLE ALT="tex2html_wrap_inline288" SRC="img6.png"> 1, and 155 <IMG WIDTH=12 HEIGHT=27 ALIGN=MIDDLE ALT="tex2html_wrap_inline288" SRC="img6.png"> 10 cm and 17.3 <IMG WIDTH=12 HEIGHT=27 ALIGN=MIDDLE ALT="tex2html_wrap_inline288" SRC="img6.png"> 0.7, 25.3 <IMG WIDTH=12 HEIGHT=27 ALIGN=MIDDLE ALT="tex2html_wrap_inline288" SRC="img6.png"> 0.9,





  
  

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44.4 <IMG WIDTH=12 HEIGHT=27 ALIGN=MIDDLE ALT="tex2html_wrap_inline288" SRC="img6.png"> 2.7 kg, respectively.  Fifty percent of all subjects were





  
  

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boys and there were similar numbers of boys and girls in each age group.  





  
  

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For comparison, we used data from historical controls, specifically,





  
  

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10 healthy, young adults (ages 18-29) who walked for one hour





  
  

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around a large track under similar conditions as in the present





  
  

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study  (12). All of the analysis methods performed on the children's





  
  

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data were applied to the first eight minutes of the longer data





  
  

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segments in this  adult control group.





  
  

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