The metabolic power required to support body weight and accelerate body mass changes during walking on uphill and downhill slopes

The metabolic cost of walking is due to muscle force generated to support body weight (BW), external work performed to redirect and accelerate the center of mass (CoM), and internal work performed to swing the limbs and maintain balance. We hypothesized that BW support would incur a greater and lowe...

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Bibliographic Details
Published in:Journal of biomechanics 2020-04, Vol.103, p.109667-109667, Article 109667
Main Authors: Zai, Claire Z., Grabowski, Alena M.
Format: Article
Language:English
Subjects:
Added load
Balance
Biomechanical Phenomena
Biomechanics
Biomimetics
Body mass
Body Weight
Energetic cost
Energy
Gait
Gravity
Humans
Legs
Mathematical analysis
Metabolic rate
Metabolism
Muscle contraction
Muscles
Reduced gravity
Slopes
Walking
Weight reduction
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Summary:The metabolic cost of walking is due to muscle force generated to support body weight (BW), external work performed to redirect and accelerate the center of mass (CoM), and internal work performed to swing the limbs and maintain balance. We hypothesized that BW support would incur a greater and lower percentage of Net Metabolic Power (NMP) for uphill and downhill slopes, respectively, compared to level-ground walking. Additionally, we hypothesized that mass redirection would incur a greater and lower percentage of NMP for uphill and downhill slopes, respectively compared to level-ground walking. 10 subjects walked at 1.25 m/s on 0°, ±3°, and ±6° slopes with reduced/added weight and added mass while we measured metabolic rates. We calculated NMP per Newton of reduced BW at each slope and found that BW support required 58% and 64% of the NMP to walk at +3° and +6°, respectively, both greater than the 15% required for level-ground walking (p 
ISSN:0021-9290
1873-2380
DOI:10.1016/j.jbiomech.2020.109667