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[Hematological variations with submaximal long-term physical exercise].

P Vogelaere1, M Brasseur, R Leclercq

  • 1Labo voor inspanningsfysiologie, Vrije Universiteit Brussel, Belgium.

Canadian Journal of Sport Sciences = Journal Canadien Des Sciences Du Sport
|March 1, 1988
PubMed
Summary
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Cold exposure does not significantly alter hematologic parameters during prolonged exercise. Physical exercise itself is the primary driver of changes in blood volume, not cold environments.

Area of Science:

  • Exercise Physiology
  • Environmental Physiology
  • Hematology

Context:

  • Understanding hematologic responses to exercise in different environmental conditions is crucial for athletes and military personnel.
  • Previous research has explored exercise-induced hematologic changes, but the specific impact of cold stress requires further elucidation.

Purpose:

  • To investigate the effects of cold environmental temperatures (0°C) compared to temperate conditions (20°C) on routine hematologic parameters during sustained submaximal exercise.
  • To determine if cold stress influences exercise-induced hypervolemia.

Summary:

  • Eight healthy males underwent two hours of submaximal cycling at 40% intensity in both 20°C and 0°C conditions.
  • Platelet and white blood cell (WBC) counts significantly increased during exercise regardless of temperature.

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  • Red blood cell (RBC), hemoglobin (Hb), and hematocrit (Hct) showed a slight, non-significant increase, with no significant changes in other indices.

    • Impact:

    • Physical exercise is identified as the main factor causing hypervolemia during exercise.
    • Low environmental temperatures do not appear to significantly influence hematologic variables during exercise.
    • Findings suggest that exercise intensity and duration are more critical than cold exposure for hematologic adaptations.