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The biomechanical functional demand placed on knee and hip muscles of older adults during stair ascent and descent

Samuel, Dinesh and Rowe, Philip and Hood, Victoria and Nicol, Alexander (2011) The biomechanical functional demand placed on knee and hip muscles of older adults during stair ascent and descent. Gait and Posture, 34 (2). pp. 239-244. ISSN 1879-2219

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Abstract

Age-related decline in physical capabilities may lead to older adults experiencing difficulty in performing everyday activities due to high demands placed on the muscles of their lower extremity. This study aimed to determine the biomechanical functional demand in terms of joint moments and maximal muscle capabilities at the knee and hip joints while older adults performed stair ascent (SA) and stair descent (SD). Eighty-four healthy older adults aged 60-88 years were tested. A torque dynamometer attached to a purpose-built plinth was utilized to measure muscle moments at the knee and hip joints. Participants also underwent full body 3-D biomechanical assessment of stair ascent and descent using an 8-camera VICON system (120Hz) with 3 Kistler force plates. Stair negotiation required knee extensor moments in excess of the maximum isometric muscle strength available (SA 103%, SD 120%). For the hip, the levels of demand were high, but were slightly lower than those of the knee joint. Stair negotiation placed a high level of demand on the knee extensors with demand in SA reaching maximal isometric capacity and demand in SD exceeding maximal isometric capacity. The levels of demand leave little reserve capacity for the older adult to draw on in unexpected situations or circumstances.

Item type: Article
ID code: 37368
Notes: Copyright © 2011 Elsevier B.V. All rights reserved.
Keywords: aged, biomechanics, hip joint, knee joint, lower extremity, middle aged, movement, muscle strength, muscle, skeletal, Walking, Bioengineering, Rehabilitation, Orthopedics and Sports Medicine, Biophysics
Subjects: Technology > Engineering (General). Civil engineering (General) > Bioengineering
Department: Faculty of Engineering > Bioengineering
Related URLs:
Depositing user: Pure Administrator
Date Deposited: 03 Feb 2012 16:24
Last modified: 27 Mar 2014 09:57
URI: http://strathprints.strath.ac.uk/id/eprint/37368

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