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Titolo:
The effect of knee-flexion angle on wheelchair turning
Autore:
MacPhee, AH; Kirby, RL; Bell, AC; MacLeod, DA;
Indirizzi:
Dalhousie Univ, Dept Med, Div Phys Med & Rehabil, Halifax, NS, Canada Dalhousie Univ Halifax NS Canada Phys Med & Rehabil, Halifax, NS, Canada Dalhousie Univ, Sch Hlth & Human Performance, Halifax, NS, Canada Dalhousie Univ Halifax NS Canada Human Performance, Halifax, NS, Canada Dalhousie Univ, DalTech, Dept Engn, Halifax, NS, Canada Dalhousie Univ Halifax NS Canada DalTech, Dept Engn, Halifax, NS, Canada Queen Elizabeth II Med Ctr, Clin Locomotor Funct Lab, Halifax, NS, Canada Queen Elizabeth II Med Ctr Halifax NS Canada ct Lab, Halifax, NS, Canada
Titolo Testata:
MEDICAL ENGINEERING & PHYSICS
fascicolo: 4, volume: 23, anno: 2001,
pagine: 275 - 283
SICI:
1350-4533(200105)23:4<275:TEOKAO>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
STABILITY;
Keywords:
wheelchair turning; knee position; center of mass; rolling resistance; turning resistance; traction; moment of inertia;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Kirby, RL Dalhousie Univ, Dept Med, Div Phys Med & Rehabil, Halifax, NS, Canada Dalhousie Univ Halifax NS Canada Rehabil, Halifax, NS, Canada
Citazione:
A.H. MacPhee et al., "The effect of knee-flexion angle on wheelchair turning", MED ENG PHY, 23(4), 2001, pp. 275-283

Abstract

The increasingly popular hyperflexed knee-flexion angle was evaluated to determine its effects on wheelchair turning. Twenty able-bodied subjects were tested comparing the effect of full knee extension and full knee flexion on a number of parameters. We empirically measured the angular velocity of subjects spinning 7200 in place, subjects' perceived ease of wheelchair turning, the overall length of the wheelchair, the anteroposterior position ofthe center of mass (COM), rolling resistance, turning resistance and rear-wheel traction. The combined moment of inertia of the wheelchair and systemwas modeled. We found that, in comparison with full extension, fully flexing the knees increased angular velocity by 40% and was perceived to be 66% easier by subjects. Overall length decreased by 39%, COM moved rearward 38%, rolling and turning resistance decreased by 21% and 17% respectively, rear-wheel traction increased by 12% and moment of inertia decreased by 42%. All empirically tested parameters were statistically significant (p < 0.007). We conclude that the knee-flexion angle has a significant effect on wheelchair turning. The implications of these findings for wheelchair design andprescription will need to be validated on actual wheelchair users and for smaller increments in knee-flexion range. (C) 2001 IPEM. Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 30/03/20 alle ore 13:28:36