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Cellular volume regulation is key for muscle strength in older adults, while functional performance depends on integrated hydration and electrolyte balance. Multidimensional hydration profiling may improve assessments.

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Area of Science:

  • Gerontology and Exercise Physiology
  • Cardiovascular and Renal Physiology
  • Cellular Biology and Hydration Dynamics

Background:

  • Muscle function in older adults is influenced by complex hydroelectrolytic mechanisms affecting cellular volume.
  • The integrated role of hydration and electrolyte regulation in muscle function among the elderly is not fully understood.
  • Existing research often focuses on isolated electrolyte concentrations, neglecting broader physiological domains.

Purpose of the Study:

  • To determine the physiological domains of hydroelectrolytic regulation most associated with muscle strength and functional performance in community-dwelling older adults.
  • To investigate the relationship between cellular hydration, electrolyte balance, and physical capabilities in elderly individuals.

Main Methods:

  • Cross-sectional study of 96 community-dwelling individuals aged 70 years and older.
  • Assessment of cellular hydration and membrane integrity via bioelectrical impedance analysis.
  • Measurement of plasma and urinary sodium and chloride concentrations.
  • Application of Principal Component Analysis (PCA) to identify hydroelectrolytic regulation domains.
  • Multivariable regression models to analyze associations with handgrip strength and Timed Up and Go (TUG) test performance.

Main Results:

  • Three principal components identified: renal-cellular (PC1), plasma electrolyte (PC2), and cellular volume (PC3), explaining 77.5% of variance.
  • Handgrip strength was significantly associated with cellular volume (PC3) and renal-cellular (PC1) domains, with PC3 remaining significant after full adjustment.
  • Functional performance (TUG) was associated with renal-cellular (PC1) and plasma electrolyte (PC2) domains, but not cellular volume (PC3) after full adjustment.

Conclusions:

  • Maximal muscle force production in older adults is primarily linked to cellular volume regulation.
  • Functional performance is associated with a broader integration of hydroelectrolytic regulation across renal, plasma, and cellular compartments.
  • Multidimensional hydration profiling may offer a more comprehensive assessment of functional status in older adults compared to isolated markers.