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J Rehabil Med. 2007 Oct;39(8):646-50.

Oxygen consumption, oxygen cost and physiological cost index in polio survivors: a comparison of walking without orthosis, with an ordinary or a carbon-fibre reinforced plastic knee-ankle-foot orthosis.

Author information

1
Department of Rehabilitation Medicine, University of Occupational and Environmental Health, Yahatanishi, Kitakyushu, Fukuoka, Japan. kenhachi@med-uoeh-u.ac.jp

Abstract

OBJECTIVE:

To examine, for polio survivors, whether walking with a carbon-fibre reinforced plastic knee-ankle-foot orthosis (carbon KAFO) is more efficient than walking with an ordinary KAFO or without an orthosis.

DESIGN:

Consecutive sample.

SETTING:

Post-polio clinic, University Hospital of Occupational and Environmental Health, Kitakyushu, Fukuoka, Japan.

PARTICIPANTS:

Eleven polio survivors who had a carbon KAFO prescribed at the post-polio clinic.

INTERVENTIONS:

A carbon KAFO was prescribed, fabricated and inspected.

MAIN OUTCOME MEASURES:

Oxygen consumption, oxygen cost and physiological cost index.

RESULTS:

An ordinary KAFO weighed 1403 g (standard deviation(SD) 157 g), whereas a carbon KAFO weighed 992 g (SD 168 g). Subjects walking with a carbon KAFO showed a tendency to increase step length, and to increase speed significantly compared with walking without an orthosis and with an ordinary KAFO (paired t-test, p < 0.05). Oxygen consumption per body weight, oxygen cost (O2 consumption for 1-m walk divided by body weight) and physiological cost index ((heart rate at 3-min walk - heart rate at rest) /speed) were significantly lower than those walking without an orthosis (-16%, -35%, -33%; paired t-test, p < 0.05) and were lower than those walking with an ordinary KAFO (-9%, -14%, -15%; paired t-test, p < 0.05).

CONCLUSION:

The gait efficiency of polio survivors with a carbon KAFO was objectively better than those without an orthosis or with an ordinary KAFO.

PMID:
17896057
DOI:
10.2340/16501977-0105
[Indexed for MEDLINE]
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