A study of 25 healthy adults showed that lumbar posture during unstable sitting in a laboratory setting closely matched real-world postures recorded over 48 hours using wearable sensors. Mean lumbar flexion in unstable sitting measured about 27°–28°, aligning more closely with daily postures than upright or preferred sitting. Participants who sat longer exhibited greater seat motion during eyes-closed tasks, while those who walked more frequently displayed stronger lumbar–seat coordination. The findings suggest that unstable sitting provides a reliable laboratory model for evaluating natural spinal posture and trunk control, supported by funding from the National Health and Medical Research Council of Australia, with no reported conflicts of interest.

Source: Journal of Clinical Medicine