Interventional study of the effects of a trunk extensor muscles fatigue protocol on trunk extensors stiffness.
Single visit interventional study of the effects of a trunk extensor muscles fatigue protocol on multifidus and erector spinae muscle stiffness measured by Ultrasound based Shearwave elastography.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
22
Participants will perform three sets of intermittent isometric efforts between 50 and 60 percents of their maximal isometric strength. A padded force sensor will be placed approximately at the level of the 7th thoracic vertebrae. The first two sets will last six minutes each, while the third set will last three minutes. Between each set participants will rest for two minutes.
University of Primorska, Faculty of Health Sciences
Izola, Slovenia
Change of trunk extensors muscle stiffness
Muscle stiffness will be measured at rest and during standardised sub-maximal exertions in prone lying position. Muscle stiffness will be expressed as the shear modulus value in kilopascals.
Time frame: 1 hour
Change of muscle electromyography mean amplitude
Muscle activation of trunk extensors will be measured using superficial electromyography at rest and during two standardised sub-maximal exertions in prone lying position (single arm raise and upper body raise). Mean amplitude in six to eight second time frames will be calculated.
Time frame: 1 hour
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