Effect of Blood Flow Restriction Training to Muscle Strength, Dynamic Stability, and ACL Injury Prevention

Effects of Additional Blood Flow Restriction and Sham Blood Flow Restriction in Eccentric Exercise on Muscle Strength, Dynamic Stability, and Reduce the Risk of ACL Injury

The goal of this randomized clinical trial study is to compare low-load blood flow restriction (LL-BFRt), sham LL-BFRt, and high-load eccentric training (HL-Et) in healthy level 1 sportsman. The main questions it aims to answer are:

1. Does LL-BFR improve muscle strength better than sham LL-BFRt and HL-Et?
2. Does LL-BFR improve dynamic stability better than sham LL-BFRt and HL-Et?
3. Does LL-BFR prevent ACL injury better than sham LL-BFRt and HL-Et?

Participants will be randomized into three intervention groups: LL-BFRt, sham LL-BFRt, and HL-Et. Participants will be asked to do:

• In LL-BFRt, participants will be asked to do LL eccentric training (including double leg squats, split squats, deadlifts, and monster walks) with a 30% of repetition maximum (RM) and 70% of arterial occlusion pressure (AOP).
• In sham LL-BFRt, participants will be asked to do LL eccentric training with a 30% of repetition maximum (RM) and 10% of arterial occlusion pressure (AOP).
• In HL-Et, participants will be asked to do LL eccentric training with a 70% of repetition maximum (RM).

Researchers will compare LL-BFRt, sham LL-BFRt, and HL-Et to see if muscle strength, dynamic stability, and ACL injury prevention improve after the interventions and follow-up.

Participants will be asked to do five sets of ten repetitions of each eccentric training, one-minute rest interval for each eccentric training and two mins rest interval between each set.

Inclusion Criteria:

• Being 15-35 years old
• Perform sports level 1 (soccer, basket ball, futsal, combat martial art) at least twice per week.
• Never had an history of ACL injury
• Never had an history of sprain or strain grade III
• Agree to participate until the end of this study period and sign the inform consent

Exclusion Criteria:

• Having hypertension, blood circulation disease, anemia, obesity, diabetes, kidney failure, vena thromboembolic, cancer, and tumor.
• Disabilities or disabled people.