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D-18 Free Communication/Slide - Loading and Unloading Thursday, June 2, 2016, 1: 00 PM - 3: 00 PM Room: 313

Obesity Increases Joint Moments Relative to Available Strength During Gait

1809 June 2, 1

15 PM - 1

30 PM

Madigan, Michael; Koushyar, Hoda; Anderson, Dennis; Nussbaum, Maury

Author Information
Medicine & Science in Sports & Exercise: May 2016 - Volume 48 - Issue 5S - p 493
doi: 10.1249/01.mss.0000486482.41640.c9
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Lower extremity joint moments during gait are higher among obese individuals compared to non-obese individuals. However, because obese individuals also exhibit greater lower extremity strength, it is unclear if these joint moments are higher relative to available strength.

PURPOSE: To investigate the effects of obesity on lower extremity joint moments during gait, expressed relative to available strength.

METHODS: Participants included 19 obese (body mass index, or BMI >=30.0 kg/m^2) adults and 20 normal-weight (19 kg/m^2<BMI<=25 kg/m^2) adults. Sagittal plane, lower extremity joint moments were determined during gait at a self-selected speed using an inverse dynamics analysis. Maximum voluntary isometric capacity (MVIC) was assessed at the hip, knee, and ankle in flexion and extension. Joint moments were normalized to MVICs, and compared between groups using a two-way ANCOVA with gait speed and leisure-time activity level as covariates.

RESULTS: Obese participants used 52% higher normalized knee extensor moments during weight acceptance (p<0.05), and 55% higher normalized ankle plantar flexor moments during push off (p<0.05). No other differences in normalized joint moments were found between obesity groups.

CONCLUSIONS: The higher joint moments at the knee and ankle relative to available strength could help explain gait limitations present among obese individuals.

© 2016 American College of Sports Medicine