Optimizing Hamstring Activation Through EMG-Feedback and the Hamshell Device
Trial statusRecruiting
Trial phaseNot applicable
Trial typeInterventional
Biological sexAll
Age18-40
SponsorPraxisklinik Rennbahn AG
About this trial
In this study, we investigate whether training of the posterior thigh muscles with visual feedback on muscle activity is more effective than the same training without feedback. To this end, healthy, physically active adults complete a training programme on a training device twice a week for five weeks. Muscle strength, muscle activity, and flexibility are measured before and after the training. Participants are randomly assigned to one of two groups: one group trains with feedback on muscle activity, the other without. Participation involves minimal risks, similar to those of a typical strength training session (e.g. muscle soreness). The aim of the study is to improve training methods for the prevention of muscle injuries.
Eligibility criteria
This trial accepts healthy volunteersQualifiers
Age between 18 and 40 years
Recreationally active, defined as engaging in at least 150 minutes per week of moderate-intensity physical activity
Disqualifiers
Current or recent (≤6 months) musculoskeletal injury of the lower extremities
Inability to follow study procedures or instructions
Trial design
Design model
Parallel
Treatments tested in this trial
EMG-Biofeedback-Training
BehavioralParticipants complete 10 training sessions with EMG feedback over a 5-week period. The training is designed to optimize biceps femoris and gluteus maximus activation at extended knee angles using the Hamshell device. All training sessions last approximately 30 minutes and are conducted at the Rennbahnklinik. The first and middle training sessions are supervised to ensure correct exercise execution and appropriate progression. During these supervised session, EMG will be recorded.
Control
BehavioralParticpants in the control group will perform the same training as the intervention group but without EMG feedback.
Treatment groups
50 Participants
are divided into 2 treatment groupsGroup A: EMG-BiofeedbackExperimental treatment 1 intervention
Group B: ControlActive comparator 1 intervention
Trial outcomes
Primary outcomes
1
iEMG biceps femoris during a modified Nordic Hamstring Exercise
Integrated EMG activity of the biceps femoris (BF) muscle during the modified version of the Nordic Hamstring Exercise.
Time frame
Before and after the 5-week intervention periodSecondary outcomes
1
Hamstring and quadriceps strength
Hamstring and quadriceps strength (isokinetic dynamometry, concentric and eccentric modes at 0°/s, 30°/s, and 150°/s) with concurrent EMG recording of the biceps femoris and gluteus maximus
Time frame
Before and after the 5-week intervention period2
Hamstring flexibility
Hamstring flexibility assessed with the passive knee extension test
Time frame
Before and after the 5-week intervention period3
EMG biceps femoris
EMG activity of the biceps femoris and gluteus maximus during the eccentric phase of the CMJ
Time frame
Before and after the 5-week intervention period4
Functional performance
Functional performance (CMJ vertical impulse)
Time frame
Before and after the 5-week intervention periodSponsors and contacts
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Source ClinicalTrials.gov