Energetic Cost of Walking and its Physiological Correlates in Persons with Multiple Sclerosis who have Moderate Mobility Disability

Publication date: Available online 4 July 2018
Source:Archives of Physical Medicine and Rehabilitation
Author(s): Brenda Jeng, Brian M. Sandroff, Robert W. Motl
ObjectiveThis study examined aerobic capacity, upper leg muscular strength, and static postural control as correlates of the energetic cost of walking (Cw) in moderate MS mobility disability.DesignCross-sectional studySettingUniversity-based laboratoryParticipants44 persons with MS (aged 48.43±8.64 years) who have reached a benchmark of moderate mobility disability (i.e., Expanded Disability Status Scale scores between 4.0-6.0) participated in the study.Main Outcome MeasuresCw was based on (a) net oxygen consumption collected using a portable metabolic unit and (b) walking speed during the 6-Minute Walk (6MW). Participants underwent standard assessments of peak aerobic capacity, upper leg muscular strength, and static postural control.ResultsThe data were analyzed using bivariate correlation and linear regression analyses. Cw was inversely correlated with peak oxygen consumption (r=‒.308, p<0.05), peak power output (r=‒.548, p<0.00), and peak torque at 75° knee flexion (r=‒.340, p<0.05), whereas Cw was positively correlated COP area sway (r=0.319, p<0.05), and mediolateral sway velocity (r=.411, p<0.05). 40.3% of variance in Cw was explained by peak power output (β=‒.526, p<0.01) and mediolateral sway velocity (β=.339, p<0.05).ConclusionOur findings demonstrate that aerobic power and postural sway may be important correlates of Cw in moderate MS mobility disability. Peak power output reflects a person's physiological functional reserve that is directly relevant for understanding the penalty of walking impairment on the energetic demands of walking. The association between mediolateral postural sway and Cw suggests that mechanical inefficiency controlling the trajectory of the body's center of pressure during ambulation may contribute to the elevated Cw.



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