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[Sarcopenia: toward its clinical utilisation].

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Sarcopenia, or low muscle mass, lacks a universal definition, leading to varied prevalence estimates in older adults. Early detection is crucial as it impacts mortality and daily living.

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Area of Science:

  • Gerontology
  • Muscle Physiology
  • Metabolic Health

Background:

  • Sarcopenia, defined as low muscle mass, presents diagnostic challenges due to varying criteria.
  • Its prevalence in the elderly ranges widely from 7% to over 50%.
  • Muscle loss may be masked by fat and connective tissue, leading to stable or increased body weight.

Purpose of the Study:

  • To highlight the diagnostic variability and clinical significance of sarcopenia.
  • To underscore the importance of recognizing sarcopenia in elderly populations.
  • To discuss the multifaceted pathophysiology and consequences of sarcopenia.

Main Methods:

  • Muscle mass measurement using dual-energy X-ray absorptiometry (DEXA) or bioimpedance analysis (BIA).
  • Review of systemic, cellular, neuromechanical factors, and lifestyle influences.
  • Analysis of sarcopenia's association with health outcomes.

Main Results:

  • No consensus definition leads to a broad prevalence spectrum (7%–50%+).
  • Body weight may not reflect muscle loss due to tissue replacement.
  • Sarcopenia is linked to increased mortality, functional dependency, chemotherapy toxicity, and glucose dysregulation.

Conclusions:

  • Sarcopenia is a critical condition in aging with significant health implications.
  • Accurate diagnosis and understanding of its pathophysiology are essential for effective management.
  • Further research is needed to establish standardized diagnostic criteria and therapeutic strategies.