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Geriatric Physiotherapy: Musculoskeletal aging and sarcopenia · Defining and Diagnosing Sarcopenia

How muscle changes with age and how clinicians screen for, measure and classify sarcopenia.

For learning, not medical advice: for your own health, ask a doctor or another qualified professional.

Geriatric Physiotherapy · 29 questions

Try 3 questions

1. Satellite cells decline in number and function with age. Why does this matter for older muscle?

  1. They store fat for muscle fuel
  2. They carry oxygen into muscle fibers
  3. They are stem cells that repair muscle
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Answer: They are stem cells that repair muscle

Satellite cells are muscle stem cells that fuse with damaged fibers to repair and grow them, so their decline slows recovery after injury or disuse.

2. Why is ultrasound of the thigh muscles gaining use for assessing older adults' muscle?

  1. It is portable, cheap and radiation-free
  2. It measures strength directly
  3. It needs no trained operator
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Answer: It is portable, cheap and radiation-free

Ultrasound can be done at the bedside to gauge muscle thickness and quality, though results depend on a trained operator and standard technique.

3. Which muscle fibers shrink the most in age-related sarcopenia?

  1. Type I slow-twitch fibers
  2. Cardiac muscle fibers
  3. Type II fast-twitch fibers
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Answer: Type II fast-twitch fibers

Fast-twitch type II fibers atrophy preferentially with age, which is why quick, forceful movements suffer more than endurance tasks.

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