Lumbar Range of Motion and Flexion Relaxation Phenomenon Onset During Static Trunk Bending Postures

Abstract

The purpose of the current study was to assess the changes in lumbar tissue load sharing mechanism and lumbar range of motion at different trunk flexion postures. Eight participants performed the tasks of changing lumbar posture from extended to flexed posture while maintaining fixed trunk postures (30°, 60°, or 90°). Results of the present study showed that FRP onset was observed in almost all the trials at two conditions of trunk posture (i.e. 60° and 90°). The results also showed that lumbar range of motion changed significantly between the different levels of trunk posture. Findings of the current study could help for better understanding of the dynamics of lumbar active and passive tissue loading during static trunk flexion.

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