High-resolution T1 and T2 sagittal MR sequences were captured while subjects maintained supine postures on standardized foam slabs calibrated to specific indentation load deflection values.
Radiologists placed 30 human subjects inside an open-bore 3.0-Tesla MRI scanner while resting on calibrated mattress samples of varying firmness to image true anatomical vertebral alignment (L1 to S1 cobb angles).
Preserves natural L1-S1 lordosis angle, maintaining equal anterior and posterior intervertebral disc spacing.
Flattens lordosis by 4.8 degrees, compressing the anterior disc margins and stretching posterior spinal ligaments.
High-rigidity mattresses flattened natural lumbar lordosis by an average of 4.8 degrees, distorting intervertebral disc geometry, whereas compliant medium-firm surfaces preserved healthy anatomical curvature within 1.1 degrees.
Sleeping on a hard mattress physically bends your spine out of its neutral posture. Live MRI imaging proves your lower back requires targeted indentation depth to keep your vertebrae in healthy alignment.
Recommended Firmness Target: 5.5 to 6.5 out of 10
Select mattresses with progressive resistance cores that yield beneath the sacrum while supporting the lordotic lumbar gap.