Interaction between step-to-step variability and metabolic cost of transport during human walking

The Journal of Experimental Biology
Chase G RockKota Z Takahashi

Abstract

Minimizing the metabolic cost of transport can affect selection of the preferred walking speed. While many factors can affect metabolic cost of transport during human walking, its interaction with step-to-step variability is unclear. Here, we aimed to determine the interaction between metabolic cost of transport and step length variability during human walking at different speeds. In particular, two aspects of step length variability were analyzed: the amount of variations ('variations') and the organization of the step-to-step fluctuations ('fluctuations'). Ten healthy, young participants walked on a treadmill at five speeds, ranging from 0.75 to 1.75 m s-1 Metabolic cost of transport, step length variations (coefficient of variation) and step length fluctuations (quantified via detrended fluctuation analysis) were calculated. A mixed-model ANOVA revealed that variations and walking speed were strong predictors of metabolic cost of transport (R2=0.917, P<0.001), whereas fluctuations were not. Preferred walking speed (1.05±0.20 m s-1) was not significantly different from the speed at which metabolic cost of transport was minimized (1.04±0.05 m s-1; P=0.792), nor from the speed at which fluctuations were most persistent (1.00±0....Continue Reading

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Citations

Oct 5, 2020·European Journal of Applied Physiology·Jacob P DeBloisTiago V Barreira
Jun 30, 2019·The Journal of Experimental Biology·Jenny A KentNicholas Stergiou

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