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Seeing your muscles work: biofeedback may boost hamstring training

NCT ID NCT07660926

Knowledge-focused Sponsor: Praxisklinik Rennbahn AG Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tests whether adding visual feedback of muscle activity (EMG biofeedback) to hamstring exercises makes training more effective. Healthy, active adults aged 18–40 will complete a 5-week training program using a special device called the Hamshell. Half the participants train with real-time feedback on muscle activation, while the other half train without it. Researchers measure changes in muscle strength, activation, and flexibility to see if feedback leads to better results, with the goal of improving injury prevention methods.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
EMG-biofeedback training with the Hamshell device
What this could lead to
If effective, this approach could improve training methods to prevent hamstring injuries in athletes and active individuals.
What could go wrong
This is a small, early-stage study in healthy volunteers, so results may not apply to injured people or real-world sports settings. The feedback may not provide extra benefit over standard training.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 50 people

The number the study aims to enrol. It can still change while the study runs.

Started

Jun 2026

Expected to finish

Jul 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 40 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age between 18 and 40 years * Recreationally active, defined as engaging in at least 150 minutes per week of moderate-intensity physical activity Exclusion Criteria: * Current or recent (≤6 months) musculoskeletal injury of the lower extremities * Inability to follow study procedures or instructions

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Hamstring muscle strength Hamstring muscles

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The study's own enquiry address

    This study publishes an address for enquiries. See it below .

  2. The places running it

    1 site. The list below names each one and where it is.

  3. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  4. A doctor treating you

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Contacts and locations

Study contacts

  • Contact

    Email: •••••@•••••

Locations

  • Rennbahnklinik

    RECRUITING

    Muttenz, 4132, Switzerland

    Contact Email: •••••@•••••

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