Reduction of Hb levels during the racing season in nonsideropenic professional cyclists.
Hematological variables of 40 professional cyclists, all receiving intravenous iron supplementation, were followed during a 15-month period. Mean values for red blood cells (RBC), hemoglobin (Hb), and hematocrit (Ht) were significantly lower during the racing season (RS) than during the nonracing periods (NRP) (RBC: RS = 4.53 +/- 0.34 millions/mm3, NRP = 5.09 +/- 0.36 millions/mm3; line 7 of abstract: Hb: RS = 14.2 +/- 0.9 g/dl, MRS = 15.2 +/- 0.9 g/dl; Ht: RS = 40.7 +/- 2.7% NRP = 44.4 +/- 2.9%; P less than 0.001 for all). However, mean values for ferritin and mean corpuscular hemoglobin (MCH) were significantly higher during the racing season (ferritin: RS = 422 +/- 398 ng/ml, NRP = 311 +/- 321 ng/ml, P less than 0.05; MCH: RS = 31.5 +/- 1.3 pg, NRP = 30.0 +/- 1.4 pg; P less than 0.001). These results suggest that the reductions in RBC, Hb, and Ht found in professional cyclists during the racing season are not the consequence of a diminution of iron stores but rather of reduced erythropoiesis and increased RBC destruction.
Guglielmini
C
C
Centro di Richerche Biomediche Applicate allo Sport, Universitá di Ferrara, Italy.
Casoni
I
I
Patracchini
M
M
Manfredini
F
F
Grazzi
G
G
Ferrari
M
M
Conconi
F
F
D000747:Anemia, Hypochromic / Q000097:blood / Q000209:etiology*; D001642:Bicycling; D004906:Erythrocyte Count; D005293:Ferritins / Q000097:blood; D006400:Hematocrit; D006452:Hemoglobinometry; D006454:Hemoglobins / Q000378:metabolism*; D007275:Injections, Intravenous; D007501:Iron / Q000008:administration & dosage; D010807:Physical Endurance; D012621:Seasons
D006454:Hemoglobins; D005293:Ferritins; D007501:Iron