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Why is walker-assisted gait metabolically expensive?

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Priebe, Jonathon R. Kram, Rodger
Description	Country affiliation: United States Author Affiliation: Priebe JR ( Department of Integrative Physiology, University of Colorado, Boulder, CO 80309-0354, USA.)
Abstract	Walker-assisted gait is reported to be â¼200% more metabolically expensive than normal bipedal walking. However, previous studies compared different walking speeds. Here, we compared the metabolic power consumption and basic stride temporal-spatial parameters for 10 young, healthy adults walking without assistance and using 2-wheeled (2W), 4-wheeled (4W) and 4-footed (4F) walker devices, all at the same speed, 0.30m/s. We also measured the metabolic power demand for walking without any assistive device using a step-to gait at 0.30m/s, walking normally at 1.25m/s, and for repeated lifting of the 4F walker mimicking the lifting pattern used during 4F walker-assisted gait. Similar to previous studies, we found that the cost per distance walked was 217% greater with a 4F walker at 0.30m/s compared to unassisted, bipedal walking at 1.25m/s. Compared at the same speed, 0.30m/s, using a 4F walker was still 82%, 74%, and 55% energetically more expensive than walking unassisted, with a 4W walker and a 2W walker respectively. The sum of the metabolic cost of step-to walking plus the cost of lifting itself was equivalent to the cost of walking with a 4F walker. Thus, we deduce that the high cost of 4F walker assisted gait is due to three factors: the slow walking speed, the step-to gait pattern and the repeated lifting of the walker.
File Format	HTM / HTML
ISSN	09666362
Issue Number	2
Volume Number	34
e-ISSN	18792219
Journal	Gait & Posture
Language	English
Publisher	Elsevier
Publisher Date	2011-06-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Orthopedics Comparative Study Gait Humans Oxygen Consumption Male Journal Article Walking Energy Metabolism Walkers Adult Female Physiology
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Rehabilitation Biophysics Sports Science

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Why is walker-assisted gait metabolically expensive?