Energy cost, exercise intensity, and gait efficiency of standard versus rocker-bottom axillary crutch walking.
The purpose of this study was to investigate differences in selected biomechanical and physiological measurements and subjective preferences for ambulation with the standard single-tip axillary crutch versus the rocker-bottom-type axillary crutch. Self-selected walking velocities (S-SWVs) and stride length for each crutch type were determined for a two-point, non-weight-bearing, swing-through gait in 24 healthy volunteers. Relative exercise intensity, oxygen uptake (VO2), and gait efficiency were assessed for each crutch type at both S-SWVs. Subjects negotiated two architectural barriers (stairs and ramp) and completed a subjective questionnaire concerning crutch preferences. Walking with either crutch type resulted in slower S-SWVs, greater VO2, higher relative exercise intensity, and reduced gait efficiency compared with values for normal unassisted ambulation. An analysis of variance for these variables revealed nonsignificant between-crutch differences. Based on the subjective data, a preference for the standard single-tip crutch was evident. Within the scope of the study, the results supported no apparent advantage relative to energy expenditure to using the rocker-bottom crutch.
Nielsen
D H
DH
Graduate Program in Physical Therapy, College of Medicine, University of Iowa, Iowa City 52242.
Harris
J M
JM
Minton
Y M
YM
Motley
N S
NS
Rowley
J L
JL
Wadsworth
C T
CT
D000328:Adult; D001696:Biomechanical Phenomena; D003446:Crutches; D004734:Energy Metabolism / Q000502:physiology*; D004867:Equipment Design; D005260:Female; D005684:Gait / Q000502:physiology*; D006801:Humans