Effects of iron repletion on &OV0312;O2max, endurance, and blood lactate in women

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Abstract
) and endurance, 20 active women (19–35 yr) were studied while performing a V̇O2max test and an endurance test (80% V̇O2max) on a cycle ergometer. Subjects were randomly placed in an iron supplement (IG) or a placebo group (PG) using a double-blind method. After treatment in the IG, ferritin levels were higher (22.5 ± 3.4 vs 14.3 ± 2.2 ng.ml-1; P < 0.05), Hb increased (12.8 ± 0.4 to 14.1 ± 0.2 g.dl-1; P < 0.05), and TIBC decreased (366.2 ± 24.8 to 293.8 ± 14.0 μg.dl-1; P < 0.05). Also after treatment the IG's V̇O2max was significantly greater (P <0.05) than the PG value and their postendurance blood lactate decreased (5.03 ± 0.44 to 3.85 ± 0.6 mM.1-1; P < 0.05). Endurance time to exhaustion increased 38% (37.28 ± 5.03 to 51.4 ± 7.45 min) following iron treatment; however, this change was not statistically significant. The results suggest that this level of iron supplementation can reverse mild anemia, increase V̇O2max, and reduce blood lactate concentration after submaximal exercise. ©1993The American College of Sports Medicine...

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