Daily iron supplementation significantly improves maximal and submaximal exercise performance in WRA , providing a rationale to prevent and treat iron deficiency in this group .
Animal and human observational studies suggest that iron deficiency impairs physical exercise performance , but findings from r and omized trials on the effects of iron are equivocal .
Iron deficiency and anemia are especially common in women of reproductive age ( WRA ) .
Clear evidence of benefit from iron supplementation would inform clinical and public health guidelines .
Therefore , we performed a systematic review and meta- analysis to determine the effect of iron supplementation compared with control on exercise performance in WRA .
Iron repletion decreases maximal exercise lactate concentrations in female athletes with minimal iron-deficiency anemia.
We studied the effect of 2 weeks of iron therapy on exercise performance and exercise-induced lactate production in trained women athletes : six control subjects with normal parameters of iron status and nine with mild iron-deficiency anemia defined by low Fe/TIBC , ferritin , and minimally decreased Hgb values .  Iron therapy improved the abnormal measures of iron status and low Hgb in the second group to normal . Exercise performance in a progressive work-exercise protocol on a bicycle ergometer to exhaustion was unchanged after iron therapy in both groups ; however , blood lactate levels at maximum exercise in the iron-deficient group decreased significantly from 10.3 + /- 0.6 mmol/L before therapy to 8.42 + /- 0.7 after therapy ( p less than 0.03 ) . The control subjects did not significantly alter lactate levels after maximal exercise on iron compared to placebo : 8.3 + /- 0.8 mmol/L vs. 8.5 + /- 0.7 . Although there was not a significant difference in maximum exercise performance after iron therapy , these data support animal experiments implying that iron may play a role in oxidative metabolism and that minimal decreases in Hgb may impair arterial oxygen content enough to affect aerobic metabolism . In addition , these findings may have important implication s for competitive women athletes in whom mild iron deficiency may go unnoticed
Daily iron supplementation significantly improves maximal and submaximal exercise performance in WRA , providing a rationale to prevent and treat iron deficiency in this group .
Animal and human observational studies suggest that iron deficiency impairs physical exercise performance , but findings from r and omized trials on the effects of iron are equivocal .
Iron deficiency and anemia are especially common in women of reproductive age ( WRA ) .
Clear evidence of benefit from iron supplementation would inform clinical and public health guidelines .
Therefore , we performed a systematic review and meta- analysis to determine the effect of iron supplementation compared with control on exercise performance in WRA .