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dc.contributor.author Seethapathi, Nidhi
dc.contributor.author Srinivasan, Manoj
dc.date.accessioned 2015-08-21T15:12:15Z
dc.date.available 2015-08-21T15:12:15Z
dc.date.issued 2015-09-16
dc.identifier doi:10.5061/dryad.15v26
dc.identifier.citation Seethapathi N, Srinivasan M (2015) The metabolic cost of changing walking speeds is significant, implies lower optimal speeds for shorter distances, and increases daily energy estimates. Biology Letters 11(9): 20150486.
dc.identifier.uri http://hdl.handle.net/10255/dryad.94341
dc.description Humans do not generally walk at constant speed, except perhaps on a treadmill. Normal walking involves starting, stopping and changing speeds, in addition to roughly steady locomotion. Here, we measure the metabolic energy cost of walking when changing speed. Subjects (healthy adults) walked with oscillating speeds on a constant-speed treadmill, alternating between walking slower and faster than the treadmill belt, moving back and forth in the laboratory frame. The metabolic rate for oscillating-speed walking was significantly higher than that for constant-speed walking (6–20% cost increase for ±0.13–0.27 m s−1 speed fluctuations). The metabolic rate increase was correlated with two models: a model based on kinetic energy fluctuations and an inverted pendulum walking model, optimized for oscillating-speed constraints. The cost of changing speeds may have behavioural implications: we predicted that the energy-optimal walking speed is lower for shorter distances. We measured preferred human walking speeds for different walking distances and found people preferred lower walking speeds for shorter distances as predicted. Further, analysing published daily walking-bout distributions, we estimate that the cost of changing speeds is 4–8% of daily walking energy budget.
dc.relation.haspart doi:10.5061/dryad.15v26/1
dc.relation.haspart doi:10.5061/dryad.15v26/2
dc.relation.haspart doi:10.5061/dryad.15v26/3
dc.relation.haspart doi:10.5061/dryad.15v26/4
dc.relation.haspart doi:10.5061/dryad.15v26/5
dc.relation.haspart doi:10.5061/dryad.15v26/6
dc.relation.haspart doi:10.5061/dryad.15v26/7
dc.relation.haspart doi:10.5061/dryad.15v26/8
dc.relation.haspart doi:10.5061/dryad.15v26/9
dc.relation.haspart doi:10.5061/dryad.15v26/10
dc.relation.haspart doi:10.5061/dryad.15v26/11
dc.relation.isreferencedby doi:10.1098/rsbl.2015.0486
dc.relation.isreferencedby PMID:26382072
dc.subject legged locomotion
dc.subject metabolic cost
dc.subject acceleration deceleration
dc.subject optimality
dc.subject preferred walking speed
dc.subject optimal walking speed
dc.title Data from: The metabolic cost of changing walking speeds is significant, implies lower optimal speeds for shorter distances, and increases daily energy estimates
dc.type Article
prism.publicationName Biology Letters

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Title OscillatingSpeedTrial1_SacralMotion
Downloaded 12 times
Description Sacral marker motion for oscillating speed trial 1.
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Title OscillatingSpeedTrial2_SacralMotion
Downloaded 12 times
Description Sacral marker motion for oscillating speed trial 2.
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Title OscillatingSpeedTrial3_SacralMotion
Downloaded 10 times
Description Sacral marker motion for oscillating speed trial 3.
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Title OscillatingSpeedTrial4_SacralMotion
Downloaded 11 times
Description Sacral marker motion for oscillating speed trial 4.
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Title OscillatingSpeedTrial5_SacralMotion
Downloaded 12 times
Description Sacral marker motion for oscillating speed trial 5.
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Title OscillatingSpeedTrial6_SacralMotion
Downloaded 10 times
Description Sacral marker motion for oscillating speed trial 6.
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Title MetabolicData_AllSubjects
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Description Metabolic data for oscillating speed and constant speed walking + subject properties
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Title Preferred walking speeds as a function of walking distance
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Description Preferred walking speeds for walking different distances, starting and stopping at rest. The "steady state" preferred speed is measured as the average over the middle 1.4 m or the middle 0.75 m of the whole bout. The "average" preferred speed is the average over the whole bout.
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Title ConstantSpeedTrial1_SacralMotion
Downloaded 13 times
Description Sacral marker motion while walking at a constant speed on a treadmill. Trial 1: 1.12 m/s.
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Title ConstantSpeedTrial2_SacralMotion
Downloaded 12 times
Description Sacral marker motion while walking at a constant speed on a treadmill. Trial 2: 1.56 m/s.
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Title readme file
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Description readme file briefly describing the data in this data package.
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