Clinical trial Recruiting at 1 site Interventional Ages 15 to 35

Low-load blood flow restriction versus high-load eccentric training for muscle changes and knee injury prevention in young athletes

Official title: Effectiveness of Blood Flow Restriction Training on Muscle Morphology and Prevention of Patellofemoral Pain Syndrome and Anterior Cruciate Ligament Injury

Run by Udayana University · NCT06566950 · Data updated 2026-11-12

This study tests whether low-load blood flow restriction training helps increase muscle size and lower the risk of patellofemoral pain and ACL injury more than high-load eccentric or sham training in young athletes.

Quick facts

Study typeInterventional
Ages15 Years to 35 Years
SexAll
Enrollment75 (estimated)
SponsorUdayana University
Academic / other
Locations1 site (Denpasar, Bali)
StatusRecruiting
StartedSeptember 20, 2024
Main results expectedNovember 20, 2024
Study endsNovember 20, 2025
Registry record updatedJune 29, 2025
Trial IDNCT06566950 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are 15–35 year-old athletes who play high-impact sports at least twice weekly, have no prior patellofemoral pain or ACL injuries, and meet the study's health criteria.

Probably not a fit

People with excluded medical conditions (tumor/cancer, venous thromboembolism, obesity, diabetes, hypertension, anemia, renal failure), disabilities, older or nonactive individuals, or those with prior PFPS/ACL injuries are unlikely to benefit from participating.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This randomized, three-arm interventional trial will assign competitive young athletes to low-load blood flow restriction (LL-BFRt), a sham LL-BFRt, or high-load eccentric training (HL-Et). The LL-BFRt group performs eccentric exercises (stairs, single-leg squat, single-leg deadlift) at about 30% of repetition maximum with cuff pressure at ~70% of arterial occlusion pressure, the HL-Et group performs eccentric work at ~70% RM, and the sham group performs low-load work without true occlusion. Primary outcomes focus on changes in muscle morphology and markers related to prevention of patellofemoral pain syndrome and ACL injury. Sessions are conducted at the physical therapy laboratory of Universitas Udayana and a partnering physiotherapy clinic in Denpasar, Bali.

Why it matters

Potential benefit: If successful, the approach could offer a lower-load training option that increases muscle size while reducing joint load and possibly lowering knee injury risk.

How similar studies have gone: Previous research shows LL-BFR can produce muscle hypertrophy and strength gains with low loads, but its specific role in preventing patellofemoral pain or ACL injuries is not well established.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Being between the ages of 15 and 35
* Play level 1 sports (fight martial arts, basketball, futsal, and soccer) at least twice a week
* Never experienced an Patellofemoral Pain Syndrome or ACL injury before
* Never experienced a grade III sprain or strain
* Consent to participate in the study until its conclusion and provide informed consent.

Exclusion Criteria:

* Having a tumor, cancer, vena thromboembolic disease, obesity, diabetes, hypertension, anemia, and renal failure
* Disabilities or those who are disabled.

Where it's running

  • Physical therapy laboratory, College of Medicine, Universitas Udayana and ROM Physiotherapy Private Clinic Denpasar
    Denpasar, Bali, Indonesia
    Recruiting

Study contacts

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.