Document Detail

Biomechanical analysis of wheelchair propulsion for various seating positions.
MedLine Citation:
PMID:  1640378     Owner:  NLM     Status:  MEDLINE    
The pattern of propulsion was investigated for five male paraplegics in six seating positions. The positions consisted of a combination of three horizontal rear-wheel positions at two seating heights on a single-purpose-built racing wheelchair. To simulate wheelchair propulsion in the laboratory, the wheelchair was mounted on high rotational inertia rollers. For three trials at each seating position, the subjects propelled the designed wheelchair at 60 percent of their maximal speed, which was determined at the beginning of the test session. At each trial, the propulsion technique of the subject was filmed at 50 Hz with a high-speed camera for one cycle, and the raw electromyographic (EMG) signal of the biceps, brachii, triceps brachii, pectoralis major, deltoid anterior, and deltoid posterior muscles were simultaneously recorded for three consecutive cycles. The digitized film data were used to compute the angular kinematics of the upper body, while the EMG signals were processed to yield the linear envelope (LE EMG) and the integrated EMG (IEMG) of each muscle. The kinematic analysis revealed that the joint motions of the upper limbs were smoother for the Low positions-since they reached extension in a sequence (wrist, shoulder, and elbow), when compared to the High positions. Also, the elbow angular velocity slopes were found to be less abrupt for the Backward-Low position. It was observed that in lowering the seat position, less IEMG was recorded and the degrees of contact were lengthened. Among the seat positions evaluated, the Backward-Low position had the lowest overall IEMG and the Middle-Low position had the lowest pushing frequency. It was found that a change in seat position caused more variation in the IEMG for the triceps brachii, pectoralis major, and deltoid posterior. The trunk angular momentum was not found to be affected by a change in seat position which may be related to the variability among the subject's technique of propulsion or to a posture compensation.
L C Mâsse; M Lamontagne; M D O'Riain
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of rehabilitation research and development     Volume:  29     ISSN:  0748-7711     ISO Abbreviation:  J Rehabil Res Dev     Publication Date:  1992  
Date Detail:
Created Date:  1992-09-03     Completed Date:  1992-09-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8410047     Medline TA:  J Rehabil Res Dev     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  12-28     Citation Subset:  IM    
School of Human Kinetics, University of Ottawa, Ontario, Canada.
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MeSH Terms
Arm / physiology*
Muscle Contraction
Posture / physiology
Quadriplegia / rehabilitation*

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