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Related Experiment Videos

Long-term hematological effects in Special Forces trainees.

Izhak Kehat1, Avi Shupak, Ilan Goldenberg

  • 1Israel Naval Medical Institute, Israel Defense Forces Medical Corps, Haifa 31 080, Israel.

Military Medicine
|March 15, 2003
PubMed
Summary
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Endurance training may lower hematocrit (Hct) and red blood cell count in athletes, a condition sometimes called "sports anemia." This study found significant decreases in Special Forces trainees but not in submariners after two years.

Area of Science:

  • Sports Medicine
  • Exercise Physiology
  • Hematology

Background:

  • Sports anemia is a condition characterized by a decrease in red blood cells or hemoglobin concentration.
  • Athletes, particularly endurance athletes, are susceptible to physiological changes that can affect hematological parameters.
  • Screening tests for anemia are crucial for monitoring the health of individuals undergoing intense physical training.

Purpose of the Study:

  • To investigate the impact of prolonged endurance training on hematological screening tests.
  • To compare changes in red blood cell count, hemoglobin concentration, and hematocrit (Hct) between naval Special Forces trainees and submarine trainees.
  • To determine if observed hematological changes are attributable to endurance training or other factors.

Main Methods:

Related Experiment Videos

  • A retrospective study analyzing medical charts of 48 naval Special Forces trainees and 48 submarine trainees.
  • Comparison of baseline hematological values (red blood cell count, hemoglobin, Hct, mean corpuscular volume) with values after two years of training.
  • Statistical analysis to identify significant differences between the two groups and within the Special Forces group.

Main Results:

  • No significant differences in baseline hematological values were observed between the two groups.
  • Special Forces trainees showed a significant decrease in Hct (p = 0.002) and red blood cell count (p = 0.05) after two years.
  • Hematological values remained unchanged in the submarine trainees, suggesting the observed changes are training-specific.

Conclusions:

  • Long-term endurance training in Special Forces trainees is associated with a reduction in Hct and red blood cell count.
  • These hematological changes may be a physiological adaptation to intense endurance exercise, consistent with "sports anemia."
  • The absence of similar changes in submarine trainees supports the attribution of these findings to the specific demands of endurance training.