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Seasonal changes in red blood cell parameters

E Kristal-Boneh1, P Froom, G Harari

  • 1Cardiovascular Epidemiology Unit, Occupational Health and Rehabilitation Institute, Raanana, Israel.

British Journal of Haematology
|November 1, 1993
PubMed
Summary

Seasonal blood count variations, including lower haemoglobin and haematocrit in summer, were observed in Israeli men. These changes are likely due to heat acclimatization, impacting red blood cell volume.

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Area of Science:

  • Hematology
  • Environmental Physiology
  • Chronobiology

Background:

  • Seasonal variations in blood counts are documented in small studies.
  • Israel's high summer temperatures prompted an investigation into circannual blood count changes.

Purpose of the Study:

  • To determine if circannual changes in blood count exist in a large male industrial workforce.
  • To assess the influence of mean monthly temperature on blood count parameters.
  • To investigate potential changes in serum osmolality and electrolytes.

Main Methods:

  • Cross-sectional study involving 4317 male employees (aged 20-64).
  • Venous blood samples analyzed for blood count (haematocrit, haemoglobin, MCV, RBC) and serum electrolytes by month.
  • Cosinor rhythmometry used to assess circannual rhythms.

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Main Results:

  • Significantly lower haemoglobin and haematocrit values were observed in August compared to other months.
  • Lower mean haematocrit in August was attributed to reduced mean corpuscular volume (MCV), not red blood cell count (RBC).
  • Circannual rhythms explained 10-57% of variance, but most were not statistically significant.

Conclusions:

  • Observed seasonal changes in haematocrit and haemoglobin in August suggest heat acclimatization rather than endogenous circannual rhythms.
  • Evidence points to plasma and red blood cell volume expansion during hot months.
  • Seasonal variations in blood counts should be considered during clinical evaluation.