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Statistic analysis for Gait analysis data

Discussion in 'Biomechanics, Sports and Foot orthoses' started by ptulaya, May 29, 2013.

  1. ptulaya

    ptulaya Member


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    Dear All,

    I wonder what is the better representative value to show the result of gait data, between the Average angle/moment in each phase of gait or the Peak angle/moment in the gait cycle.

    Regards,
     
  2. sobhani_sobhan

    sobhani_sobhan Active Member

    Dear Tulaya,
    There is no good or bad as far as I know. It depends on your research, and your outcome of ineterset. What do you want to check? Usually the peak moments are studied. You can also calculate "the moment impulse (moment over time)" as the area under the curve of joint moment. I did not understand what you mean by AVERAGE mean.

    Cheers
    Sobhan
     
  3. efuller

    efuller MVP

    One of the problems of studying gait is that walking with a certain patern can cause pain to occur. On the ohter hand a person avoiding pain will change how they walk. Does the gait cause the pain or does the pain cause the gait?

    You should read all the works by David Winter. He looked at a concept called support moment. A certain amount of "moment" is required to stay erect while walking. However, he found a trade off between hip and knee moment. The more the hip moment the less the knee moment. He found a a wide variation between individuals and quite a bit of variation within an individual on different days. There are many different ways to walk and people subconsciously choose one of them. Think about Monty Python and the minister of silly walks.

    Eric
     
  4. ptulaya

    ptulaya Member

    Thanks to both of your suggestions.
     
  5. ptulaya

    ptulaya Member

    Dear Sobhan,

    I mean the average (mean) the value of angle in the specific phase of gait, such as loading response (0-20% of stance).

    Tulaya
     
  6. sobhani_sobhan

    sobhani_sobhan Active Member

    Tulaya,
    Isn`t these parameters time-dependent? Each time interval has its own values. Doesn`t it? Can you simply average it? I assume you have several trials per subject. What about now? How many moment curves do you have? Can you make a mean curve by simply averaging these curves? What about variability within trials? All curves are totally symmetric, no time-shift?
    Let`s say you only have one trial per subject. You want to look at loading response (0-20% of gait cycle not stance phase I guess?). You have 20 data points. You want to avergae 20 values of angles? Is is correct to do so? What is the value of this?

    Please explain what you want to do exactly. how many trials? and also read this paper which can answer some of your questions.
    1) Reduction of gait data variability using curve registration
    Sadeghi, Paul Allard, Khalil Shafied, Pierre A. Mathieue, Somayeh Sadeghi, Francois Prince, James Ramsayg

    Think about it and let`s discuss it further. It is an intersting topic.
    Good luck
     
  7. efuller

    efuller MVP

    Why do you want a mean? The answer to that question may help you figure out how to get a mean. Or, it may help you figure out you don't really have a use for a mean.

    Eric
     
  8. ptulaya

    ptulaya Member

    Dear Sobhan,

    Thanks for your suggestion. I will review the article and I will come back to discuss futher.

    Tulaya
     
  9. ptulaya

    ptulaya Member

    Thanks for your suggestion. I will review again and come back to discuss more.

    Tulaya
     
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