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Age-related decrease of odorant sensitivity for a selection of nine diverse molecules.

Agnieszka Sabiniewicz1, Malaika Krause2, Thomas Hummel2

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PubMed
Summary
This summary is machine-generated.

Odor sensitivity declines with age, particularly for heavier molecules. This study investigated age-related differences in odor perception across various odorants, revealing significant variations based on age and molecular weight.

Keywords:
AgingOdor thresholdOlfaction

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Area of Science:

  • Olfactory neuroscience
  • Gerontology
  • Sensory perception

Background:

  • Olfactory function naturally declines with age.
  • However, this decline is not uniform and can be influenced by factors like "successful aging" and specific odorant properties.
  • Previous research suggests certain molecules are more affected by age-related olfactory loss.

Purpose of the Study:

  • To prospectively investigate and compare odor thresholds in younger and older adults.
  • To examine the influence of diverse odorant properties on age-related olfactory sensitivity.
  • To determine if age-related olfactory decline is molecule-specific.

Main Methods:

  • A prospective study involving 58 participants, with 31% aged 50 years or older.
  • Assessment of odor detection thresholds for a panel of nine distinct odorants.
  • Statistical analysis using a General Linear Mixed Model (GLMM) to evaluate age and molecular weight effects.

Main Results:

  • Younger adults demonstrated significantly higher odor sensitivity compared to older adults, irrespective of the odorant.
  • Molecular weight influenced odor thresholds across all age groups, with lighter molecules yielding higher sensitivity.
  • No significant interaction was found between molecular weight and age group, suggesting age-related decline is not solely dependent on molecule weight in this cohort.

Conclusions:

  • Odor thresholds generally decrease with age, with a more pronounced effect observed for higher molecular weight compounds.
  • Contrary to some previous findings, this study did not find evidence that age-related olfactory decline is significantly more pronounced for specific molecules within the tested set.
  • The findings suggest that while age and molecular weight are key factors in olfactory perception, the specificity of odorant decline may depend on the chosen molecular set.