Eleven subjects, 5 male and 6 female, all with back pain, performed 3 times 10-minute tasks separated by 2 × 10-minute relaxation tasks, while sitting for one 1-hour session on a rotary dynamic seat (DS). Ss preferred different speed settings depending on task. Ss chose to have no motion (speed setting 0) for “active tasks” (writing, typing, and using the mouse) and moderate speed (speed setting 3 or 4) for passive (relaxation) tasks. Subjective responses showed that Ss needed to concentrate and felt the movement was interfering with performance and attention during active tasks. Ss found the DS relaxing and soothing during passive tasks, which required less concentration and performance.
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