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).