The Effects of Balanced Seating Pressure on Pelvic Asymmetry: A Pilot Study
The Effects of Balanced Seating Pressure on Pelvic Asymmetry in Under-Buttocks Pressure, Spinal Alignment, and Lower Back Pain: A Pilot Study
Chang Gung Memorial Hospital
20 participants
Sep 12, 2025
INTERVENTIONAL
Conditions
Summary
The goal of this clinical trial is to learn if the DaSuit® cushion helps reduce discomfort caused by sitting in adults with non-specific low back pain. It will also assess the safety and physical effects of using the DaSuit® cushion. The main questions it aims to answer are: 1. Does the DaSuit® cushion distribute the pressure evenly on both under-buttock pressure compared to a placebo cushion? 2. Does the DaSuit® cushion improve spinal alignment compared to a placebo cushion? 3. What discomfort or adverse events do participants experience when using the DaSuit® cushion? Researchers will compare the DaSuit® cushion to a placebo cushion (a look-alike cushion without therapeutic effect) to see if the DaSuit® cushion works to relieve sitting-induced discomfort. Participants will: 1. Use the DaSuit® cushion or a placebo cushion in a randomized order, with each sitting session lasting 10 minutes 2. Complete both conditions with a 10-minute washout period between sessions 3. Sit on a standardized wooden chair with a pressure sensor mat placed on the cushion surface 4. Keep a fixed posture with hips, knees, and ankles at approximately 90 degrees 5. Watch a 10-minute video on a tablet positioned 30-40 cm in front of them at a 5-10 degree downward angle to maintain a steady gaze 6. Undergo spinal imaging immediately after each session, maintaining the same seated posture 7. Report any discomfort or pain experienced during or after each session
Eligibility
Inclusion Criteria6
- adults aged 20 to 50 years
- adults had low back pain non-specific but exacerbated by sitting with VAS score between 3-7
- body height between 150-180 cm
- BMI between 18.5-24
- a radiographically verified hemi-pelvic height discrepancy of ≥ 0.3 cm in sitting posture
- willing to participate and cooperate throughout the whole intervention session
Exclusion Criteria7
- inability to sit for 20 minutes
- MMSE < 24
- significant spinal/pelvic disorders (e.g., fractures, surgeries, herniated discs with nerve compression)
- scoliosis with Cobb angle ≥ 20°
- recent use of pain killers and/or muscle relaxants
- pregnancy
- skin conditions affecting sitting tolerance.
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Interventions
The Dasuit cushion is placed on a 40X40X40 wooden box as a chair, and the pressure seating mat is placed on the cushion. Participants were asked to sit on the cushion with hips, knees, and ankles positioned at approximately 90° angles at ease. A tablet was mounted in front of the chair at 30-40 cm from the eyes and at a downward viewing angle of 5-10 degrees. Participants were instructed to watch a 10-minute video to maintain a fixed gaze and minimize head movement. The patient was to sit on the cushion at ease for 1 minute to adjust to the cushion, then under-buttock pressure was recorded for 10 mins.
The placebo cushion is placed on a 40X40X40 wooden box as a chair, and the pressure seating mat is placed on the cushion. Participants were asked to sit on the cushion with hips, knees, and ankles positioned at approximately 90° angles at ease. A tablet was mounted in front of the chair at 30-40 cm from the eyes and at a downward viewing angle of 5-10 degrees. Participants were instructed to watch a 10-minute video to maintain a fixed gaze and minimize head movement. The patient was to sit on the cushion at ease for 1 minute to adjust to the cushion, then under-buttock pressure was recorded for 10 mins.
A 10 min washout period is in between the two interventions. The paitent is asked to walk around at ease.
Locations(1)
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NCT07062510