Table 1.

Blood cell counts in sedentary controls and runners

ConditionRBC,
cells × 106/μl
Hct,
%
Reticulocytes,
%RBC
WBC,
cells × 103/μl
Neutrophils,
%WBC
Lymphocytes,
%WBC
Platelets,
cells × 103/μl
Controls
Baseline5.2 ± 0.447.7 ± 2.81.61 ± 0.486.4 ± 0.860.8 ± 4.927.5 ± 4.0244 ± 90
Half-marathon
Baseline4.9 ± 0.244.6 ± 2.1* 0.76 ± 0.41* 6.0 ± 1.154.1 ± 8.931.5 ± 6.9232 ± 44
End of race4.9 ± 0.345.5 ± 1.41.84 ± 0.86 10.5 ± 2.6 67.0 ± 9.723.6 ± 8.7311 ± 51
Morning postrace4.7 ± 0.343.6 ± 2.10.89 ± 0.256.1 ± 1.155.5 ± 10.030.0 ± 8.9234 ± 44
Marathon
Baseline4.8 ± 0.2* 43.9 ± 1.8* 0.80 ± 0.59* 6.6 ± 1.453.7 ± 7.832.5 ± 5.4224 ± 34
End of race4.8 ± 0.343.8 ± 1.71.59 ± 0.25 15.2 ± 3.2 82.3 ± 5.0 10.0 ± 3.0 299 ± 43
Morning postrace4.7 ± 0.243.4 ± 1.90.65 ± 0.267.5 ± 0.957.4 ± 6.929.9 ± 4.5230 ± 45
  • Values are means ± SD. RBC, red blood cells; WBC, white blood cells. Significant difference vs.

  • * controls and

  • baseline, P < 0.05.