Effects of Isometric Muscle Fatigue on Trunk Muscle Stiffness

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT05490966

Enrollment

Registered

2022-08-08

Start date

2022-09-10

Completion date

2022-10-18

Last updated

2022-10-19

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Muscle Tightness

Keywords

multifidus, erector spinae, muscle stiffness

Brief summary

Interventional study of the effects of a trunk extensor muscles fatigue protocol on trunk extensors stiffness.

Detailed description

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.

Interventions

OTHERisometric trunk extensor muscles fatigue

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.

Study design

Allocation

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 of trunk extensors muscle stiffness	1 hour	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.

Secondary

Measure	Time frame	Description
Change of muscle electromyography mean amplitude	1 hour	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.

Other

Measure	Time frame	Description
Change in lumbar range of motion	1 hour	Lumbar range of motion will be evaluated using Modified modified Schober test.

Countries

Slovenia

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026