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  • Individual leg muscle contributions to the cost of walking: Effects of age and walking speed

    Author(s)
    Pincheira, Patricio A
    Stenroth, Lauri
    Avela, Janne
    Cronin, Neil J
    Griffith University Author(s)
    Cronin, Neil
    Year published
    2017
    Metadata
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    Abstract
    This study examined the contributions of individual muscles to changes in energetic cost of transport (COT) over seven walking speeds, and compared results between healthy young and elderly subjects. Twenty six participants (13 young aged 18-30; 13 old aged 70-80) were recruited. COT (O2/kg body mass/km) was calculated by standardizing the mean oxygen consumption recorded during steady state walking. Electromyography signals from 10 leg muscles were used to calculate the cumulative activity required to traverse a unit of distance (CMAPD) for each muscle at each speed. In the old group CMAPD was correlated with COT, presented ...
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    This study examined the contributions of individual muscles to changes in energetic cost of transport (COT) over seven walking speeds, and compared results between healthy young and elderly subjects. Twenty six participants (13 young aged 18-30; 13 old aged 70-80) were recruited. COT (O2/kg body mass/km) was calculated by standardizing the mean oxygen consumption recorded during steady state walking. Electromyography signals from 10 leg muscles were used to calculate the cumulative activity required to traverse a unit of distance (CMAPD) for each muscle at each speed. In the old group CMAPD was correlated with COT, presented higher and more variable values, and showed greater increases around optimal speed for all studied muscles. Soleus CMAPD was independent of speed in the young group, but this was not evident with aging. Greater energy cost of walking in older individuals seems to be attributable to increased energy cost of all lower limb muscles.
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    Journal Title
    Journal of Aging and Physical Activity
    Volume
    25
    Issue
    2
    DOI
    https://doi.org/10.1123/japa.2015-0232
    Subject
    Sports science and exercise
    Science & Technology
    Life Sciences & Biomedicine
    Geriatrics & Gerontology
    Gerontology
    Sport Sciences
    Publication URI
    http://hdl.handle.net/10072/405350
    Collection
    • Journal articles

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