Does anabolic resistance mean older adults cannot build muscle?

Understanding the question

No. Anabolic resistance describes a reduced muscle protein synthesis response to a given stimulus under particular conditions, often discussed in relation to aging, inactivity or illness. It does not mean muscle has lost all capacity to adapt. Older adults can improve strength, function and muscle-related outcomes with appropriately delivered resistance exercise and adequate nutrition. The response varies with activity history, health and the intervention. Acute synthesis findings should also be separated from long-term changes in performance or tissue size. Age is an important context, but it is not a complete explanation for every person’s training response.

What a useful investigation needs to consider

Chronological age groups contain substantial variation in health, mobility and prior activity. Studies of frail, hospitalized or inactive participants should not be treated as interchangeable with studies of healthy active older adults.

Persistent weakness or loss of function warrants assessment rather than a blanket explanation of normal aging. Sarcopenia evaluation includes strength and other relevant measures; a protein-synthesis result or an online muscle-size estimate alone does not establish a diagnosis.

Read the detailed explanation

The companion article explores anabolic resistance and the continuing adaptability of older muscle in more depth, with topic-specific explanations and source material.