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**Sarcopenia** is a condition characterized by the progressive loss of skeletal muscle mass, strength, and function. It is commonly associated with aging but can also result from other medical conditions or lifestyle factors. Below is an overview:
### **Causes and Risk Factors**:
1. **Aging**: Natural decline in muscle mass and regenerative capacity after the age of 30-40.
2. **Sedentary Lifestyle**: Lack of physical activity accelerates muscle degradation.
3. **Malnutrition**: Insufficient protein and caloric intake to support muscle repair and growth.
4. **Chronic Diseases**:
- Diabetes
- Chronic kidney disease
- Heart failure
- Cancer
5. **Hormonal Changes**: Decreased levels of growth hormone, testosterone, and estrogen.
6. **Inflammation**: Persistent systemic inflammation, such as in rheumatoid arthritis.
7. **Neuromuscular Disorders**: Conditions impairing muscle-nerve connections.
8. **Medications**: Long-term use of corticosteroids or other catabolic drugs.
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### **Clinical Features**:
1. Decreased muscle strength (e.g., difficulty lifting objects or climbing stairs).
2. Reduced muscle mass, often visible through imaging or physical examination.
3. Impaired physical performance, such as slower walking speed.
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### **Diagnosis**:
1. **Muscle Strength**: Handgrip strength test.
2. **Muscle Mass**: Dual-energy X-ray absorptiometry (DXA) or bioelectrical impedance analysis (BIA).
3. **Physical Performance**: Gait speed or the Short Physical Performance Battery (SPPB).
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### **Management**:
1. **Exercise**:
- Resistance training (e.g., weightlifting)
- Aerobic exercise to enhance overall fitness.
2. **Nutrition**:
- High-protein diet (1.2–1.5 g/kg/day of protein).
- Adequate vitamin D and omega-3 fatty acid intake.
3. **Medications**:
- Investigational agents like myostatin inhibitors.
- Testosterone replacement in specific cases.
4. **Physical Therapy**: Tailored rehabilitation programs for mobility and strength.
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### **Prevention**:
1. Regular physical activity, especially strength training.
2. Balanced diet rich in protein, vitamins, and minerals.
3. Monitoring and treating underlying medical conditions.
4. Avoiding prolonged bed rest or inactivity.
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