Effects of Wheelchair Mass on the Physiologic Responses, Perception of Exertion, and Performance During Various Simulated Daily Tasks

Abstract Sagawa Y Jr, Watelain E, Lepoutre F-X, Thevenon A. Effects of wheelchair mass on the physiologic responses, perception of exertion, and performance during various simulated daily tasks. Objective To verify whether additional manual wheelchair mass above a critical level would produce, during many daily tasks, an increase in physiologic parameters, an increase in the perceived exertion, and a decrease in performance. Design A repeated-measurement design. Setting Six standardized tests thought to mimic daily activities. Participants Volunteers (N=21), 8 men with spinal cord injuries (SCIs; mean age, 34±12y; range, 19–56y) and 13 able-bodied persons (11 men and 2 women; mean, 24±5y; range, 18–37y). Interventions Random additional masses (“0”, 1, 2, 5kg) were placed under the seat of a multisport manual wheelchair (mass approximately 10kg) out of the subject's field of vision. Main Outcome Measures Energy expenditure (EE; total o2 consumed), heart rate (total number of beats), perceived exertion (visual analog scale), and performance (seconds to execute a sprint test) were measured. Results For all tests, there was no significant effect of mass found for either group for the EE, heart rate, and performance. In addition, for all tests, no significant effect of mass was found for the SCI group for the visual analog perceived exertion. However, for the able-bodied group, the added mass had a significant effect for the visual analog perceived exertion (F=6.11; P =.02) in the Stop-and-Go test. A post hoc Tukey test showed a significant difference between the 0kg and 5kg mass conditions ( P