Occupational Exposure
Conditions
Keywords
bending, load, stiffness, elastography, deformation
Brief summary
An interventional study on the effects of repeated trunk flexion exposure on trunk neuromuscular properties.
Detailed description
An interventional study will include 16 healthy young adults. All participants will complete a 60-min protocol of intermittent trunk flexion. Measurements of trunk neuromuscular properties will be performed prior to and following the 60-min protocol.
Interventions
A 60-min intermittent trunk flexion protocol. Participants will sit on a standard height sit, with their knees bent at approximately 90° with their hands crossed on their chest. They will perform 40 sets of 60 s of maintaining a flexed position, interspersed with 30 s of rest. Participants will achieve the flexed position by tilting the pelvis posteriorly and leaning forward. During rest, participants will sit up straight without leaning on the support.
Sponsors
University of Primorska
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
BASIC_SCIENCE
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 40 Years
Healthy volunteers
Yes
Inclusion criteria
* Physically active at least 3 hours a week
Exclusion criteria
* Low back pain in the past 6 months * History of chronic low back pain * History of spinal or pelvic operation * Hypermobility, more than 4 points on Beighton scale * Cardiovascular or systemic diseases * Pregnancy
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change in muscle stiffness | 90 minutes | Muscle stiffness will be measured in prone lying using ultrasound-based shear wave elastography. Erector spinae and multifidus muscle stiffness will be expressed as the shear modulus value in kilopasquals. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Change in range of motion | 90 minutes | Trunk flexion range of motion will be evaluated using inertial measuring units during bending in standing position. |
| Change in length of the spine | 90 minutes | The length of spine will be measured on a custom-developed stadiometer, with the participants in a seated position. |
| Change in muscle activity | 90 minutes | Muscle activity will be measured using electromyography during standing. |
Countries
Slovenia
Outcome results
None listed