Marieke G M Kloosterman1, Jaap H Buurke2, Leendert Schaake3, Lucas H V Van der Woude4, Johan S Rietman5. 1. Roessingh Research and Development, Enschede, The Netherlands; Faculty of Engineering Technology, Laboratory of Biomechanical Engineering, University of Twente, Postbox 217, 7500 AE Enschede, The Netherlands. Electronic address: mariekekloosterman83@gmail.com. 2. Roessingh Research and Development, Enschede, The Netherlands; Faculty of Electrical Engineering, Mathematics and Computer Science, Department of Biomedical Signals and Systems, University of Twente, Postbox 217, 7500 AE Enschede, The Netherlands. Electronic address: j.buurke@rrd.nl. 3. Roessingh Research and Development, Enschede, The Netherlands. Electronic address: l.schaake@rrd.nl. 4. University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences, Postbox 30.001, 9700 RB Groningen, The Netherlands; University of Groningen, University Medical Center Groningen, Center for Rehabilitation, Postbox 30.001, 9700 RB Groningen, The Netherlands. Electronic address: l.h.v.van.der.woude@med.umcg.nl. 5. Roessingh Research and Development, Enschede, The Netherlands; Faculty of Engineering Technology, Laboratory of Biomechanical Engineering, University of Twente, Postbox 217, 7500 AE Enschede, The Netherlands. Electronic address: j.s.rietman@rrd.nl.
Abstract
BACKGROUND: Frequent start movements occurred during the day, yielding high upper-extremity stress. The high incidence and impact of shoulder injury on daily life wheelchair use made it clinically relevant to investigate whether power-assisted propulsion is beneficial during the start. METHODS: Eleven hand-rim wheelchair users performed a start-movement in an instrumented wheelchair on a flat surface. Test order was randomly assigned to propulsion with and without power-assist. For each subject, parameters were averaged over 3 repeated starts. For statistical analysis Wilcoxon Signed Rank test was used. FINDINGS:Intensity of mechanical shoulder loading decreased during power-assisted propulsion for anterior (147.0 (44.8) versus 121.9 (27.4) N; effect size (r)=-.75), posterior (4.8 (14.1) versus 2.7 (11.6) N; r=-.64) and inferior directed forces (82.6 (27.9) versus 68.9 (22.6) N; r=-.78) and abduction (20.2 (14.6) versus 12.9 (7.8) Nm; r=-.88) and extension moments (20.3 (10.7) versus 13.7 (9.1 Nm; r=-.88). Peak resultant force at the rim significantly decreased from 133.5 (38.4) N to 112.2 (25.4) N (r=-.64) and was accompanied by significant decreased shoulder abduction (35.3 (6.7) versus 33.3 (6.8); r=-.67) and significant increased shoulder extension (13.6 (16.3) versus 20.3 (19.1); r=-.78) during power-assisted start-up. INTERPRETATION: Power-assist hand-rim wheelchairs are effective in reducing external shoulder load and partly effective in reducing force generation in extremes of shoulder motion during start-up. The use of power-assist wheels might reduce the risk of developing shoulder overuse injuries. CLINICAL TRIAL REGISTRATION NUMBER: NTR2661.
RCT Entities:
BACKGROUND: Frequent start movements occurred during the day, yielding high upper-extremity stress. The high incidence and impact of shoulder injury on daily life wheelchair use made it clinically relevant to investigate whether power-assisted propulsion is beneficial during the start. METHODS: Eleven hand-rim wheelchair users performed a start-movement in an instrumented wheelchair on a flat surface. Test order was randomly assigned to propulsion with and without power-assist. For each subject, parameters were averaged over 3 repeated starts. For statistical analysis Wilcoxon Signed Rank test was used. FINDINGS: Intensity of mechanical shoulder loading decreased during power-assisted propulsion for anterior (147.0 (44.8) versus 121.9 (27.4) N; effect size (r)=-.75), posterior (4.8 (14.1) versus 2.7 (11.6) N; r=-.64) and inferior directed forces (82.6 (27.9) versus 68.9 (22.6) N; r=-.78) and abduction (20.2 (14.6) versus 12.9 (7.8) Nm; r=-.88) and extension moments (20.3 (10.7) versus 13.7 (9.1 Nm; r=-.88). Peak resultant force at the rim significantly decreased from 133.5 (38.4) N to 112.2 (25.4) N (r=-.64) and was accompanied by significant decreased shoulder abduction (35.3 (6.7) versus 33.3 (6.8); r=-.67) and significant increased shoulder extension (13.6 (16.3) versus 20.3 (19.1); r=-.78) during power-assisted start-up. INTERPRETATION: Power-assist hand-rim wheelchairs are effective in reducing external shoulder load and partly effective in reducing force generation in extremes of shoulder motion during start-up. The use of power-assist wheels might reduce the risk of developing shoulder overuse injuries. CLINICAL TRIAL REGISTRATION NUMBER: NTR2661.