By what percent does muscle mass generation decline per decade after the second decade?

By what percent does muscle mass generation decline per decade after the second decade?

• A. 10-12%
• B. 20-25%
• C. 5-7%
• D. 15-20%

Answer: (A)

The concept here is aging-related muscle anabolism decline, often termed anabolic resistance, which reduces the body's ability to generate and maintain muscle mass as we age. After the second decade, this decline accumulates, and most people experience about a 10–12% drop in muscle mass generation capacity per decade. This range reflects the common trajectory seen with aging, where hormonal changes, reduced motor unit recruitment, and decreased responsiveness to protein and resistance exercise blunt muscle-building efforts. Choosing a rate like 5–7% would underestimate how much muscle-building capacity typically wanes, while 15–20% or 20–25% would overstate the decline for most individuals. Of course, actual rates vary with activity level: regular resistance training and adequate protein can slow the decline, but the general trend centers around roughly ten percent per decade.

The concept here is aging-related muscle anabolism decline, often termed anabolic resistance, which reduces the body's ability to generate and maintain muscle mass as we age. After the second decade, this decline accumulates, and most people experience about a 10–12% drop in muscle mass generation capacity per decade. This range reflects the common trajectory seen with aging, where hormonal changes, reduced motor unit recruitment, and decreased responsiveness to protein and resistance exercise blunt muscle-building efforts.

Choosing a rate like 5–7% would underestimate how much muscle-building capacity typically wanes, while 15–20% or 20–25% would overstate the decline for most individuals. Of course, actual rates vary with activity level: regular resistance training and adequate protein can slow the decline, but the general trend centers around roughly ten percent per decade.