Determination of a sagittal plane axis of rotation for a dynamic office chair.

摘要: Abstract Objective This study investigated the location of axis rotation in sagittal plane movement spine a free sitting condition to adjust kinematics mobile seat for dynamic chair. Background Dynamic office chairs are designed avoid continuous isometric muscle activity, and facilitate increased mobility back during sitting. However, these incorporate upper body which could distract workers from performance their tasks. A chair with an above would stable movements lower back. The selection natural kinematic pattern is high importance order match properties spine. Method Twenty-one participants performed four cycles flexion extension arm hang on parallel bars. relative was estimated using infrared cameras reflective skin markers. Results median across all located 36 cm complete 39 cm both phases, each interquartile range 20 cm. Conclusion There no significant effect direction only weak, non-significant correlation between height rotation. Individual patterns explained majority variance. Application spinal flexion/extension seat. recommended radius guide rail 39 cm.