Strength Training Prevents Muscle Loss
A new randomized controlled trial compared high-intensity functional training to traditional resistance training in overweight men, measuring inflammatory, metabolic, and physical outcomes. A comprehensive guide details how regular strength training supports metabolic health, mobility, and independence into old age, recommending basic compound movements with slow progression.
- After the age of 50, muscle mass decreases by approximately 1–2% annually. Muscle strength declines even more rapidly, at a rate of 1.5% per year between ages 50 and 60, and 3% per year thereafter. - This age-related loss of muscle mass and function is known as sarcopenia, a condition that affects 5–13% of people aged 60–70 years, and up to 50% of those over 80. Sarcopenia is a primary cause of frailty and increases the risk of falls and fractures. - Resistance exercise stimulates the release of anabolic hormones, such as testosterone and growth hormone, for 15-30 minutes after a workout. These hormones play a role in signaling the muscle to repair and grow. - Strength training creates mechanical tension and metabolic stress in the muscles, which activates the mTOR pathway, a key regulator of protein synthesis. This process, known as muscle protein synthesis, is the mechanism by which the body builds new muscle tissue. - For muscle growth to occur, the rate of muscle protein synthesis must be greater than the rate of muscle protein breakdown. Consuming protein, particularly sources high in the amino acid leucine like whey protein, after exercise can further enhance this process. - In a study of individuals with locally advanced esophageal cancer, sarcopenia prevalence increased from 16% at diagnosis to 31% after neoadjuvant therapy, and was associated with a higher risk of major postoperative complications.
