An interventional study of Unloading maneuvers in Occupational Exposure, sponsored by University of Primorska. Recruiting at 1 site in Slovenia. Open to male participants aged 30 Years to 55 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-08-12.
Sponsored by University of Primorska · Not applicable, Interventional, and Treatment
An experimental study, which will aim to investigate the acute effects of unloading maneuvers during an intermittent spinal flexion protocol on changes in trunk mechanical and neuromuscular properties.
Our experimental study will include 30 participants. All participants will complete a 60-min intermittent spinal flexion protocol. During rest periods within the protocol, the participants from the intervention group will perform unloading maneuvers for the lumbar spine. Measurements of trunk mechanical and neuromuscular properties. will be performed prior to and following the 60-min protocol.
University of Primorska is the lead sponsor of 56 studies on the registry; 7 are open to participants now.
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Exclusion Criteria:
Adult participants completing only the spinal flexion protocol
Adult participants performing unloading maneuvers in between the spinal flexion protocol
Other: Unloading maneuvers
Participants will perform unloading maneuvers four times with 15 min of spinal flexion protocol in between. The intervention will include self traction on a box (5 s) and sustained standing trunk extension (8 s). Both maneuvers will be repeated twice at each timepoint.
Change in muscle stiffness
Muscle stiffness will be measured using ultrasound-based shear wave elastography during prone lying and forward stooping. Erector spinae and multifidus muscle stiffness will be expressed as the shear modulus value in kilopascals.
Time frame: 90 minutes
Change in range of motion
Trunk flexion range of motion will be evaluated using Spinal Mouse in maximal trunk flexion while standing.
Time frame: 90 minutes
Change in seated spinal height
Seated spinal height will be measured on a custom-developed stadiometer, with the participants in a seated position.
Time frame: 90 minutes
Change in lumbar lordosis angle
The lumbar lordosis angle will be evaluated using Spinal Mouse during upright standing.
Time frame: 90 minutes
Change in trunk extension maximal strength
Isometric trunk extension peak torque will be assessed on a trunk dynamometer.
Time frame: 90 minutes
Plan to share: Yes — Coded individual data will be uploaded on public scientific data repository.
Supporting information: Study protocol
No publications or documents are linked to this record.
Start is estimated for Aug 2025; primary completion for Sep 2025, 1 month later.
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