Metabolic Cost and Mechanical Efficiency of a Novel Handle-Based Device for Wheelchair Propulsion.
Markus Puchinger, Nithin Kurup, Karin Gstaltner and 2 others
PMID 36264132WHAT IT FOUND
A new handle-based propulsion device let wheelchair users reach higher power outputs with less physical strain than standard push-rims.
In this small study, both paraplegic and non-disabled participants showed better mechanical efficiency and lower heart rates when using the handle device.
Key findings
01Participants achieved higher peak power output and had lower peak heart rates and ventilation when using the handle-based device compared to standard push-rims.
02During submaximal exercise, gross mechanical efficiency was higher and oxygen consumption was lower for the handle-based device in both paraplegic and non-disabled groups.
03Respiratory exchange ratios remained below 1.0 for the handle-based device during maximal effort, whereas they exceeded 1.0 for push-rim propulsion, indicating less physical exhaustion with the new device.
STILL TO COME
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What it does not show
The sample size was very small, with only seven paraplegic and nine non-disabled subjects analysed. The non-disabled control group was significantly younger than the paraplegic group, which may have affected cardiorespiratory fitness comparisons. The study was not randomised; participants alternated between devices, and the sample size was determined by availability rather than statistical power. The test rig simulated resistance in a laboratory setting, which may not fully reflect real-world propulsion conditions like varying terrain or acceleration. The device is novel and not commercially available, so long-term usability and injury prevention data are not provided in this study.
Declared interests
No specific funding sources or conflicts of interest are declared in the provided text.
The easy way to misread this
Do not assume this device prevents upper limb injuries or improves daily function outside the lab. The study only measured short-term physiological efficiency and power output in a small group, not long-term clinical outcomes or injury rates.