Abstract
AbstractThe efficacy of assistive devices used during walking is often measured as a reduction in metabolic cost. Metabolic cost is typically assessed within a day or on multiple days, yet the benefit of performing within-day vs. between-day metabolic assessments is unknown. The purpose of this study was to determine the within-day minimal detectable change of standard measures of physiologic performance using a conventional portable metabolic system (K4b2 Cosmed, Rome, Italy), and compare these to between-day values. Twenty healthy adults completed two identical data collection sessions on separate days. In each session they performed three bouts of treadmill walking interspersed with three bouts of rest while oxygen consumption (VO2˙), carbon dioxide production, and heart rate were measured. Intraclass correlation coefficients (ICC) and minimal detectable change values were calculated for non-resting within-day, as well as all between-day comparisons. All within-day measures were clinically reliable (IC...
Highlights
IntroductionA reduction in metabolic cost is one of the primary goals of assistive devices used during walking such as prostheses (Herr & Grabowski, 2012; Houdijk, Pollmann, Groenewold, Wiggerts, & Polomski, 2009; Major, Twiste, Kenney, & Howard, 2014; Segal et al, 2012; Zelik et al, 2011), orthoses (Balaban et al, 2007; Menotti, Laudani, Damiani, Mignogna, & Macaluso, 2014; Menotti, Laudani, Damiani, Orlando, & Macaluso, 2014; Zissimopoulos, Fatone, & Gard, 2007), or exoskeletons (Malcolm, Derave, Galle, & De Clercq, 2013; Sawicki & Ferris, 2008, 2009)
The results of this study suggest that, where possible, physiologic changes should be assessed within a single day of testing to maximize ability to detect small changes in performance
In the Rehabilitation Biomechanics Laboratory, we focus on the study of repetitive human movements such as walking and reaching
Summary
A reduction in metabolic cost is one of the primary goals of assistive devices used during walking such as prostheses (Herr & Grabowski, 2012; Houdijk, Pollmann, Groenewold, Wiggerts, & Polomski, 2009; Major, Twiste, Kenney, & Howard, 2014; Segal et al, 2012; Zelik et al, 2011), orthoses (Balaban et al, 2007; Menotti, Laudani, Damiani, Mignogna, & Macaluso, 2014; Menotti, Laudani, Damiani, Orlando, & Macaluso, 2014; Zissimopoulos, Fatone, & Gard, 2007), or exoskeletons (Malcolm, Derave, Galle, & De Clercq, 2013; Sawicki & Ferris, 2008, 2009). Establishing within-day MDCs provides a benchmark by which investigators can determine true changes in human performance and allow for more precise assessments of assistive devices used during walking
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