Enhancing Hamstring Muscle Activation with EMG Biofeedback Using the Hamshell Device A 5-Week Training Program for Healthy Adults Aged 18 to 40

What this Trial Is About

Researchers are evaluating the effectiveness of training the posterior thigh muscles using real-time electromyographic EMG biofeedback compared to training without feedback. The study focuses on healthy, physically active adults aged 18 to 40 and aims to improve hamstring activation methods to help prevent muscle injuries. This controlled study is conducted in a single center and involves a parallel-group design with random assignment. Participants complete a 5-week training program with the Hamshell device, designed to target hamstring and gluteus maximus muscles at extended knee angles. They attend 10 sessions twice weekly, each lasting about 30 minutes. One group trains with visual EMG feedback to optimize muscle activation, while the control group performs the same exercises without feedback. The first and middle sessions are supervised to ensure proper technique and progression, with EMG recordings taken during these sessions. Participants undergo assessments before and after the training program, including muscle strength tests, flexibility measurements, electromyographic recordings, and functional performance evaluations such as countermovement jumps. Training adherence and perceived exertion are tracked throughout. The primary outcome is the integrated EMG activity of the biceps femoris muscle during a modified Nordic hamstring exercise. Secondary outcomes include various strength, flexibility, and functional measures. The entire study period is planned to last about 12 months, including recruitment and follow-up.

Optimizing Hamstring Activation Through EMG-Feedback and the Hamshell Device