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Anticipation of slippery floors: muscle onsets and co-contraction of the stance leg.

Authors
Chambers-AJ; Cham-R
Source
Proceedings of the International Society of Biomechanics XXth Congress and the 29th Annual Meeting of the American Society of Biomechanics, July 31 - August 5, 2005, Cleveland, Ohio. Newark, DE: The American Society of Biomechanics, 2005 Jul; :467
NIOSHTIC No.
20039867
Abstract
INTRODUCTION: Falls are a major cause of injury, death and disability in the elderly [4,6,8]. In relatively healthy older adults, falls are often precipitated by base of support (BOS) perturbations such as slips and trips [1,5,6]. The use of proactive strategies has been revealed in gait studies using testing paradigms involving repeated exposure to a known perturbation [2,3]. The goal of this study, which has not been previously addressed, is to investigate the impact of anticipating real slippery floors on the muscle activity (onset and co-contractions) in the leading/left leg during gait on dry surfaces. DISCUSSION AND CONCLUSIONS: In summary, anticipating slippery surfaces affects lower leg muscle activation onsets and ankle/knee stiffness. While young and older subjects adopted similar strategies at the ankle when anticipating slippery floors, there were age-related differences associated with the upper leg muscles. It is worth noting the most critical recovery responses to slips are generated at the knee and hip, not the ankle.
Keywords
Humans; Men; Women; Age-groups; Age-factors; Accidents; Physiology; Physiological-function; Physiological-factors; Physiological-effects; Physical-reactions; Injuries; Knee-injuries; Muscles; Muscle-function; Musculoskeletal-system
Publication Date
20050701
Document Type
Abstract
Email Address
ajcst49@pitt.edu
Funding Type
Grant
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R03-OH-007533; Grant-Number-R01-OH-007592
Source Name
Proceedings of the International Society of Biomechanics XXth Congress and the 29th Annual Meeting of the American Society of Biomechanics, July 31 - August 5, 2005, Cleveland, Ohio
State
OH; PA
Performing Organization
University of Pittsburgh, Pittsburgh, Pennsylvania
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