Li Li, Nirav Patel, Deborah Solomonow, Peter Le, Heather Hoops, David Gerhardt, Kyle Johnson, Bing He Zhou, Yun Lu, Moshe Solomonow
OBJECTIVE: To study the influence of 10 min of cyclic twisting motion on abdominal and back muscle activities. BACKGROUND: Repetitive (cyclic) occupational activity was identified by many epidemiological reports to be a risk factor for the development of work-related musculoskeletal disorders. Biomechanical and physiological confirmation, however, is lacking. METHODS: Trunk muscle electromyography (EMG) was recorded while participants performed a continuous 10-min maximum lumbar cyclic twisting to the left, and maximum isometric twist to the left and right sides was measured before and after the exercise...
October 2007: Human Factors