NCT06330129

Validity and Reliability of Trunk Strength Device

Validity and Reliability of Trunk Muscle Strength Assessements With Isometric Dynamometry

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 30 (actual)
• Sponsor: Schulthess Klinik · Academic / Other
• Sex: All
• Age: 18 Years – 59 Years
• Healthy volunteers: Accepted

Summary

The study aims to evaluate the accuracy and consistency of assessing trunk muscle strength using an isometric device (Pegasus, Leipzig, Germany). Thirty healthy volunteers will undergo maximal isometric strength testing with the device, repeated one week later to assess repeatability. Surface electrodes will measure muscle activation, while MRI scans will assess structural condition.

Detailed description

The aim of the study is to assess the validity and repeatability of trunk muscle strength evaluation using an isometric device (Pegasus, Leipzig, Germany) and to investigate it. Thirty healthy volunteer participants will undergo testing of maximal isometric (non-moving) strength using this device. The same strength measurement procedure will be repeated one week later for all participants to determine if the measurements are repeatable, i.e., if the device is capable of providing similar strength data in two closely timed measurements. To assess whether the device actually provides reliable strength data for the trunk muscles, surface electrodes will be additionally placed on the involved muscles to understand the extent of neural activation of these muscles during the test. Additionally, an MRI examination will be conducted for all study participants to assess the structural condition of the trunk muscles.

Conditions

• Trunk Muscle Strength

Interventions

Type	Name	Description
DEVICE	CTT Pegasus	The intervention aims to assess the construct validity of trunk flexor, extensor, and rotator muscle strength using the CTT PEGASUS isometric dynamometer (Leipzig, Germany). This involves correlating muscle strength measured isometrically with its physiological determinants: MRI-based anatomical cross-sectional area (CSA) in the lumbar region and muscle activation measured via surface electromyography (EMG) of spine and trunk muscles. Additionally, the intervention will assess the test-retest reliability of isometric strength of trunk flexors, extensors, and rotators.

Timeline

• Start date: 2024-11-15
• Primary completion: 2025-03-31
• Completion: 2025-04-01
• First posted: 2024-03-26
• Last updated: 2025-05-13

Locations

1 site across 1 country: Switzerland