Table 4

Iron status, haematological variables, and changes in vascular volumes in trained subjects (group 3) during three days (women) and four days (men) of aerobic cycling exercise

Day 1Day 2Day 3Day 4
BeforeAfterBeforeAfterBeforeAfterBeforeAfter
Values are mean ( SD). Differences for resting values of BV, PV and RCV from the initial values (day 1) are calculated for every day (column “before”); exercise related changes are calculated for every day from the respective pre-exercise data (column “after”).
*Significant difference from day 1 (same sampling time); †significant difference from same day pre-exercise value.
sTfr, soluble transferrin receptor; PCV, packed cell volume; BV, blood volume; PV, plasma volume; RCV, red cell volume.
Men (n=7)
    sTfr (mg/l)1.39 (0.1)1.39 (0.2)1.31 (0.2)1.37 (0.2)†1.32 (0.2)1.36 (0.2)1.3 (0.1)1.4 (0.2)
    Ferritin (ng/ml)83 (40)87 (39)67 (30)75 (34)77 (36)87 (38)†87 (38)94 (44)
    Transferrin (mg/dl)219 (32)232 (43)206 (38)219 (46)207 (44)233 (35)†211 (37)212 (33)
    Iron (μg/dl)104 (31)110 (22)132 (51)108 (49)†136 (48)101 (49)†131 (43)*150 (57)
    Protein (g/dl)7.9 (0.3)8.2 (0.4)†7.3 (0.7)7.5 (0.8)7.3 (1)8.2 (0.6)†7.6 (0.6)8 (0.6)†
    Haemoglobin (g/dl)14.2 (0.5)14.8 (0.6)†14.1 (0.9)14.4 (0.8)13.5 (0.7)*14.9 (0.5)†13.4 (0.8)*14 (0.7)†
    PCV (%)43.7 (2.2)45.2 (2.6)†43.1 (3.2)44.3 (2.8)41.8 (2.1)*45.4 (1.9)†41.4 (2.0)*43.2 (1.8)†
    BV (% change)−4.0 (1.2)†0.7 (0.3)−2.1 (0.8)5.2 (1.9)*−9.4 (3.2)†6 (1.3)*−4.2 (1.0)†
    PV (% change)−6.6 (2.1)†1.8 (0.5)−4.2 (1.2)8.7 (3.1)*−15.0 (5.3)†10.3 (3.1)*−7.2 (1.9)†
    RCV (% change)−0.8 (0.1)−0.6 (0.1)0.6 (0.1)0.6 (0.1)−1.6 (0.4)0.4 (0.2)−0.1 (0.0)
Women (n=6)
    sTfr (mg/l)1.52 (0.3)1.47 (0.2)1.5 (0.3)1.6 (0.4)1.6 (0.3)1.6 (0.3)
    Ferritin (ng/ml)50 (27)50 (7)50 (29)52 (29)45 (26)47 (28)
    Transferrin (mg/dl)271 (36)282 (40)262 (36)288 (33)276 (20)296 (24)
    Iron (μg/dl)129 (25)84 (31)115 (43)128 (16)106 (26)120 (27)
    Protein (g/dl)7.9 (0.3)8.1 (0.7)7.9 (0.6)8.5 (0.4)†8 (0.4)8.4 (0.6)†
    Haemoglobin (g/dl)13.7 (0.6)14.1 (0.8)13.4 (0.9)14.5 (0.7)†12.8 (0.6)*13.4 (0.8)†
    PCV (%)42.1 (2.7)43.2 (2.4)40.9 (2.9)44.1 (2.1)†38.1 (2.6)*40.8 (2.9)†
    BV (% change)−2.8 (1.2)2.2 (0.6)−7.6 (2.1)†7 (2.9)*−4.8 (1.6)†
    PV (% change)−4.7 (1.8)4.4 (1.5)−12.6 (3.2)†14.4 (5.2)*−8.6 (2.9)†
    RCV (% change)−0.3 (0.1)−0.6 (0.1)−0.4 (0.1)−3 (1.3)2.2 (0.1)