Sudden loading and fatigue effects on the human spine.
Department of Mechanical Engineering, University of Utah, Salt Lake City, Utah 1992 Nov; :1-52
The effects of fatigue and load magnitude on the in-vivo torso response of human subjects to a sudden load were analyzed in six individuals. Parameter identification of the human spine was performed within a sudden loading, short duration, high intensity fatigue paradigm. The findings indicated that fatigue is an important factor under conditions of sudden loading. The fatigued subject does not respond in the same way as he does when not tired. It is suggested that a higher degree of injury would be expected under conditions of fatigue. Most of the time the worker is not at the point of fatigue, and therefore, performance of certain tasks is usually practiced under conditions which are better than those prevalent under conditions of fatigue. Two reports are being produced from the data gathered in this study. The first will examine the electromyographic responses of the individual and compare them to the dynamics of the torso. The second study will mathematically study the compression levels expected as a result of earlier work. The authors suggest that their most important finding was the ability to mathematically model a complex response of the torso to a sudden load with a simple second order linear model. The study demonstrated that short duration, high intensity muscular fatigue changes the way in which the torso responds to a sudden load.
NIOSH-Grant; Musculoskeletal-system-disorders; Muscle-function; Physiological-fatigue; Accident-prevention; Safety-practices; Back-injuries; Mathematical-models; Fatigue-properties
Mechanical Engineering the University of Utah 2266 Meb Salt Lake City, Utah 84112
Final Grant Report
NTIS Accession No.
Department of Mechanical Engineering, University of Utah, Salt Lake City, Utah
University of Utah, Salt Lake City, Utah