<Inactivity of muscle> What should we do???

1. As a therapist

1.1. 1. Especially, endurance exercise needs for type Ⅰ muscle during early immobilization

1.2. 2. Resistance exercise can prevent muslce loss during immobilzation

1.3. 3. Eccentric contraction is more effective for regaining muscle strength after immobilization

1.4. Exercise examples

2. As a student

2.1. 1. Strength can decrease 50% of strength during 5 weaks of bedrest by 1.0-1.5 % per day. 2. Especially, quadriceps and extensor. 3. Mass of muscle lost 5-10% per week.

2.2. 4. Recruitment pattern chnages

3. As a reseacher

3.1. Effect of resistive Exercise on muscle mass, strenth, endureance in subject with femur fracture during bed rest

3.2. Effect of resistive exercise of adjacent muscle group on triceps surae muscles during ankle sprain casting

3.3. Effect of prone heel squeeze exercise on ankle muscles during ankle casting

3.4. Comparison of three different prone heel squeeze exercises on hip and ankle muscles during ankle casting

3.5. Effect of weight bearing training on quadriceps in subject with mild hemiplegic child

4. Comparison of inactivity and aging

4.1. 공통점: 1. Muscle fiber cross-sectional area loss 2. Strength loss

4.2. 차이점

4.2.1. Inactivity : 1. Type Ⅰ muscle (Slow twitch) loss 2. oxidative enzyme loss

4.2.2. Aging: 1. Type Ⅱ muscle fiber (fast twitch) loss 2. Increased fat -after 30y, 15% ↑ -at 60y: 30% ↑ 3. Concentration of mitochindrial enzymes