Unstable Sitting Replicated Real-World Lumbar Posture
October 29, 2025
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3 min
A study involving 25 healthy adults examined lumbar posture during unstable sitting tasks compared to real-world sitting postures. Measurements over 48 hours using wearable motion sensors showed that while upright sitting exhibited 19.8° of lumbar flexion, preferred sitting had 30°, and unstable sitting ranged from 27.1° to 28.1°. Greater movements were observed in participants who sat more daily. The findings suggest that laboratory unstable sitting tasks may effectively mimic everyday lumbar spine postures, forming a basis for future research on posture and ergonomics.
1. Study included 25 healthy adults. 2. Postures measured over 48 hours. 3. Unstable sitting matched real-world lumbar posture. 4. Lumbar flexion: 19.8° (upright), 30° (preferred), 27.1°-28.1° (unstable). 5. Greater movement in those sitting more. 6. Findings suggest dynamic postural control links to habitual behavior. 7. Study provides foundation for future research in posture and ergonomics.
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