The effects of resistance training with different muscle contraction patterns on cognitive and physical function in sedentary older adults.

INTERVENTION: Concentric contraction training group (CCT):Concentric contraction of the knee joint;Eccentric contraction training group (ECT):Perform eccentric contractions of the knee joint at 60°/s using an isokinetic muscle strength tester.;Isometric contraction training group (ICT):Isometric contraction of the knee joint;Control group (CON):Health education lectures that are unrelated to exercise but still require time investment; CONDITION: None PRIMARY OUTCOME: Stroop test;Muscle strength; SECONDARY OUTCOME: Chinese MoCA scale;5 Times Sit‐to‐Stand Test;Grip strength;Daily physical activities;Sedentary lifestyle;Skeletal muscle mass;Fat mass; INCLUSION CRITERIA: 1. Age >= 65 years, residing in the community. 2. Meeting the characteristics of sedentary lifestyle and insufficient physical activity: Has not engaged in systematic and regular exercise training (such as resistance training, Tai Chi, square dancing, etc.) within the past 3 months; assessment shows that the recommended level of 150 minutes of moderate‐intensity physical activity per week has not been met; and the average daily sedentary time is relatively long (e.g >= 6 hours). 3. Possesses independent walking ability and can complete daily walking without assistive devices. 4. Has basically normal cognitive function (MMSE >= 26 points), possesses basic communication and comprehension abilities, and is able to sign an informed consent form. 5. Agrees to wear the designated wearable device and can cooperate under supervision to complete resistance training with different muscle contraction patterns and all follow‐up tests.