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Free Moment Normalization Parameters

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  • Free Moment Normalization Parameters

    Free moment, or the torsional loading between the foot and the ground, has been studied on a limited basis for gait analyses. Cavanagh and Holden proposed normalizing free moment to bodyweight (BW) and height in their 1991 paper about free moment. For joint moments, it is generally accepted that they need to be normalized to account for differences in height, through overall height or length of a particular segment. However, as free moment is in essence a moment without a reference segment, perhaps it would be better to only normalize it to BW.

    A cited reference search on Web of Science turned up 16 citations of Cavanagh and Holden, 1991. Of those, 12 papers calculated free moment for activities ranging from standing to running and jumping. Six normalized to BW and height as Cavanagh and Holden did. Two normalized to BW and leg length, two did not normalize, and two did not state their normalization technique.

    I am curious what thoughts the biomechanics community has about appropriate normalization parameters for free moment. I will post a summary of replies.

    Rebecca Fellin, MS
    ASB Student Representative
    Research Assistant
    Biomechanics and Movement Science
    University of Delaware
    Newark, DE 19716