title: Metabolic cost of walking with and without a shoe lift on the contralateral foot of an immobilised extended knee.
abstract: The purpose of the present study was to determine the metabolic cost of walking with and without a shoe-lift on the contralateral foot of an immobilised extended knee. Eight male subjects were randomly allocated and participated in both the treatment (walking with a 2.5 cm shoe-lift) and control (walking without a shoe-lift) conditions. Cardiac output (Q) and related cardiovascular measurements were analysed to determine the effect of a shoe-lift on central (heart rate (HR); stroke volume (SV)) and peripheral (arteriovenous oxygen difference (a-vO2 diff)) components of oxygen consumption (VO2). A metabolic analyser was used to determine VO2 (ml x kg(-1) x min(-1)), which was converted to oxygen cost (ml x kg(-1) x m(-1)). The shoe-lift had no significant (p > 0.05) effect on VO2 or oxygen cost. There were no significant differences in Q, HR, SV, a-vO2 diff, systemic vascular resistance, carbon dioxide production, respiratory exchange ratio, expired ventilation, tidal volume and respiratory rate between the two walking conditions with and without a shoe-lift. These findings demonstrate that a shoe-lift added to the contralateral foot of an immobilised extended knee does not produce clinically important effects on oxygen cost or efficiency during walking.
authors.affiliation: Department of Exercise Physiology, The College of St. Scholastica, Duluth, MN 55811, USA. tboone2@css.edu
authors.forename: T
authors.initials: T
authors.lastname: Boone
mesh_terms: D000328:Adult; D004734:Energy Metabolism; D006439:Hemodynamics; D006801:Humans; D007103:Immobilization; D007719:Knee Joint; D008297:Male; D009989:Orthotic Devices; D010100:Oxygen / Q000097:blood; D010101:Oxygen Consumption; D015656:Respiratory Mechanics; D012775:Shoes; D016138:Walking
chemical_list: D010100:Oxygen