Age-related changes in muscle physiology

4 important questions on Age-related changes in muscle physiology

What is the atrophy of a muscle fiber?

  • Epimysium
  • Tendon
  • Bone
  • Perimysium
  • Blood vessel
  • Muscle fiber
  • Fascicle
  • Endomysium

Surgery results in muscle mass loss, how?

  • Muscle serves as a protein-pool to deal with surgical stress
  • Surgery is usually followed by bed-rest
  • This leads to muscle atrophy
    • 3.4% loss in quadriceps CSA during 1 week of hospitalization
    • 1.5 kg loss in whole body lean mass during 10 days of bed rest

Short-term internventios are needed to lower the muscle mass loss when having surgery. What is needed?

  • Time window of training: 30 days
  • Current effective strategies take > four months
  • two systematic reviews conclude
    • rehabilitation is a promising idea
    • but there is a need to explore effective interventions, including nutrient supplementation, of maximum 30 days


4-week exercise AND nutrition
  • 2 days per week: supervised training
    • 30 minutes resistance exercise
    • 30 minutes HIT
  • 5 days per week: adhere to exercise guidelines
  • 2x 15g milk-protein per day
  • 1 arm pre-post design, n=17
  • no planned surgery


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What is the conclusion of the 4-week Exercise AND nutrition study

  • 4 weeks of intense exercise + protein supplementation improves muscle mass, strength and physical performance
  • Possibly effective to prevent hospital-induced losses in muscle mass and strength
  • Application for preoperative patients should be further explored

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