Comparison of Cardiopulmonary Function Changes during Wheelchair Propulsion: Backrest Angle

Abstract

[Purpose] Changes in cardiopulmonary function during wheelchair propulsion on a treadmill were measured using wheelchairs according to backrest angle adjustment. [Methods] Twenty-two healthy male subjects were the subjects. Oxygen consumption (VO₂, ml/min), heart rate (HR, beats/min), carbon dioxide emissions (VCO₂, ml/min), oxygen uptake per body weight (VO₂, ml/kg/min), and respiration frequency (Rf) were used as the measurement variables for cardiopulmonary data. [Results] The peak value, average value and value at rest were compared. When resting, the value did not differ except for VO₂, and the peak value, did not differ except for VCO₂. However, the average value in all except VO₂/kg (at 13 degrees) was significantly lower than 3 degrees (93°). [Conclusion] A 13° wheelchair backrest angle (103°) provides a lower cardiopulmonary workload than the base angle (3°). A training program for good seating and posture needs to be provided