The Influence of Reduced Muscle Quality on Muscular Dimensional Changes and Performance: Implications for the Elderly and Obese Public Deposited

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  • March 19, 2019
  • Giuliani, Hayden
    • Affiliation: College of Arts and Sciences, Department of Exercise and Sport Science
  • Muscle quality has been suggested to contribute to the age-related decline in muscle function, which is exacerbated by obesity. Although the mechanism is unknown, it may be due to a reduction in muscular dimensional changes with contraction. The purpose of the present study was to determine if the dimensional changes during contraction is influenced by intramuscular fat, and its relationship to muscle strength and performance. Forty-nine males were categorized into three groups by BMI and age. Participants completed a walking test, a maximal and submaximal isometric strength assessment, while ultrasonography was used to determine muscular dimensions. Muscle size decreased (P<0.045) across torque intensities in the young group, but not in the older men (P>0.410). A greater change in muscle size was correlated with faster walking speed (r=-0.377,P=0.013), but not muscle quality or strength. Future studies are needed to determine which non-contractile tissues contribute to the alterations in muscular dimension changes.
Date of publication
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Rights statement
  • In Copyright
  • Ryan, Eric
  • Blackburn, J. Troy
  • Gerstner, Gena
  • Master of Arts
Degree granting institution
  • University of North Carolina at Chapel Hill Graduate School
Graduation year
  • 2017

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