Lumbar Spine Kinematics in Asymptomatic People When Changing Body Position From Sitting to Standing

The purpose of this study was to assess the lumbar spine kinematics in 3 movement axes in asymptomatic individuals in the sit-to-stand (STS) movement performed in a habitual, flexion, or extension manner.

There were 30 participants (16 women, 14 men), aged 23 to 37 years. Each participant performed an STS test. We registered the total time of the STS movement and the maximum acceleration of the lumbar spine in the vertical, anteroposterior, and mediolateral axes. The examination of the movement pattern was performed with the use of a BTS G-sensor device.

The highest movement dynamics in the lumbar spine were observed during the STS performed in a habitual manner in the 3 axes (P < .01). The lowest movement dynamics ere associated with the extension STS pattern. The flexion pattern differed from the habitual one in total performance time in both groups (P < .01). There were no significant differences in kinematic lumbar spine between sexes.

The kinematics of the STS movement for asymptomatic individuals were characterized by significant variability in the maximum acceleration in the 3 axes. The highest movement dynamics were observed during the STS performed in a habitual manner, and the lowest dynamics with the extension pattern of STS.