Energy expenditure in stroke subjects walking with a carbon composite ankle foot orthosis

Journal of Rehabilitation Medicine
Anna Danielsson, Katharina S Sunnerhagen

Abstract

To measure walking speed and energy cost in patients with prior stroke with and without a carbon composite ankle foot orthosis. Within-group comparisons of 2 walking conditions. Convenience sample of 10 hemiparetic patients with a stroke at least 6 months earlier (average age 52 years) habituated to a carbon composite ankle foot orthosis. Subjects walked on a treadmill at self-selected speed both with and without ankle foot orthosis for 5 minutes on each occasion. Energy expenditure was measured by breath-by-breath analysis and electrocardiography. Main outcome measures were walking speed, oxygen consumption, heart rate and energy cost per metre. Walking speed: without ankle foot orthosis 0.27 (SEM +/- 0.03) m/s, with 0.34 (+/- 0.06) m/s, difference 20%. Oxygen consumption: without ankle foot orthosis 8.6 (+/- 0.4) ml/kg/min, with 8.8 (+/- 0.5) ml/kg/min. Energy cost: without ankle foot orthosis 0.58 (+/- 0.07) ml/kg/m, with 0.51 (+/- 0.06) ml/kg/m, difference 12%. Use of a carbon composite ankle foot orthosis in patients with stroke may increase speed and decrease energy cost during walking.

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