Anticipation of slippery floors: muscle onsets and co-contraction of the stance leg.
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
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.
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
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
University of Pittsburgh, Pittsburgh, Pennsylvania