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Changes in segmental inertial properties with age.

Jennifer Muri1, Samantha L Winter, John H Challis

  • 1Biomechanics Laboratory, The Pennsylvania State University, 39 Recreation Hall, University Park, PA 16802-3408, USA.

Journal of Biomechanics
|April 22, 2008
PubMed
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Limb segment inertial properties change with age, particularly in the forearm and thigh, potentially due to muscle mass changes. These age-related variations have minimal impact on calculated knee and hip joint moments during gait.

Area of Science:

  • Biomechanics
  • Human Aging Research
  • Anthropometry

Background:

  • Limb segment inertial properties are crucial for biomechanical analyses.
  • Understanding age-related changes in these properties is vital for accurate modeling.
  • Previous research has not extensively detailed inertial parameter variations across multiple decades.

Purpose of the Study:

  • To investigate how limb segment inertial parameters change across different age decades (1920s-1970s).
  • To identify specific segments and inertial properties most affected by aging.
  • To assess the influence of these age-related changes on gait-related joint moments.

Main Methods:

  • Sixty-six healthy males (20-79 years) participated.
  • Limb segments modeled as geometric solids to determine inertial properties.

Related Experiment Videos

  • Multivariate and subsequent ANOVAs used to compare decade age groups.
  • Linear regression analyzed age-related trends in inertial parameters.
  • Joint moments computed using inertial properties from age extremes.

    • Main Results:

    • Statistically significant differences in upper arm, forearm, shank, and thigh inertial properties were found between age groups (p<0.01).
    • Specific parameters like upper arm inertial properties, forearm center of mass, and thigh mass showed significant age-related trends.
    • Age-related changes were consistent with expected alterations in muscle mass.
    • Differences in computed knee and hip joint moments between young and old subjects were less than 4.5%.

    Conclusions:

    • Limb segment inertial properties exhibit significant age-dependent variations, particularly in the upper limb and lower limb segments.
    • These changes are likely associated with age-related muscle mass decline.
    • Despite significant changes in segment properties, the impact on calculated joint moments during gait is relatively small.