Effects of blood flow restriction of the lower extremity on functional performance

INTERVENTION: Participants will be randomly allocated into 3 groups using sealed envelopes, namely high blood flow restriction, low blood flow restriction, and a control group. All participants will undergo isokinetic muscular strength of the lower extremity measurements, Y‐balance test and figure‐of‐eight hopping test before and after the 8‐week intervention. The interventions for those groups: 1. High blood flow restriction: participants will perform knee extension exercise under high blood flow restriction with low resistance training (30% 1repetitive maximum, RM) 2. Low blood flow restriction: participants will perform knee extension exercises under low blood flow restriction with low resistance training (30% 1RM) 3. Control group: participants will perform knee extension exercises under high resistance training (60% 1RM) without blood flow restriction. The level of blood flow restriction is determined by the limb occlusion pressure (LOP). For the high blood flow restriction group, the level of blood flow restriction is set at 60% LOP, while for the low blood flow restriction group, the level of blood flow restriction is set at 30% LOP. CONDITION: Healthy adults ; Not Applicable PRIMARY OUTCOME: Muscular strength of the lower extremity measured using a Biodex isokinetic dynamometer before and after the 8‐week intervention SECONDARY OUTCOME: Balance measured using the Y‐balance test and figure‐of‐eight hopping test before and after the 8‐week intervention INCLUSION CRITERIA: 1. Adults aged from 20‐40 years old 2. Live in Taiwan 3. Without significant injuries in the last three months (such as fractures) 4. Open wounds on the lower extremity 5. Pregnancy 6. Normal resting heart rate and blood pressure