Impact of Knee Extension Brace on Quadriceps EMG During ASLR

The main objective of this study is to evaluate quadriceps thigh muscle activity during active straight leg raise (ASLR) with a knee brace. An additional aim of the study is to evaluate quadriceps activity during straight leg raise with a knee brace in a variable command and manner of task performance. The study will be conducted on a group of healthy individuals aged 18 - 35 years. Height and weight were measured using a scale and centimetre tape. Then, according to the study protocol, specific measurements will be taken of the rectus femoris, medial vastus and lateral vastus muscles using surface EMG of a non-invasive nature. Study participants will undergo the following measurements: 1. Measurement of the MVIC (maximum voluntary isometric contraction) of the quadriceps of the thigh, in a sitting position with the lower leg flexed to 90 degrees and in knee extended (0 degrees). 2. Measurement of muscle activity during elevation of the straightened lower limb in a supine position without an orthosis. 3. Measurement of muscle activity during straight leg raise in supine position with knee brace (default and different commends).

NCT Number	NCT06821477
Lead Sponsor	Józef Piłsudski University of Physical Education
Conditions	EMG, Exercise Response
Enrollment	20 participants
Start Date	2025-02-03
Primary Completion	2025-10-31 (estimated)
Study Completion	2025-12-31 (estimated)
Updated on ClinicalTrials.gov	2025-07-18