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 .
Effect of an iron supplement on body iron status and aerobic capacity of young training women
Summary Serum iron deficiency has a high incidence in female athletes . We investigated the effects of a daily oral iron supplement , ( 160 mg ) administered during an intensive 7-week physical training programme , on body iron status , and the maximal aerobic capacity ( VO2max ) of 13 women ( group A ) compared to 15 who took a placebo ( group B ) . The subjects were 19 years old . Blood sample s were obtained before training began and on days 1 , 7 , 21 and 42 of training . They were analysed for packed cell volume ( PVC ) and for haemoglobin ( Hb ) , 2,3-diphosphoglycerate ( 2,3-DPG ) , haptoglobin , iron and ferritin concentrations . TheVO2max was measured on days 0 , 21 and 42 of training . Following 21 days of training Hb , PCV and ferritin were significantly higher ( P⩽0.01 ) in group A compared to group B. Over the training period Hb rose by 9.3 % and 2.4 % in groups A and B , respectively . At the end of training 66 % of group B exhibited ferritin concentrations below 10 ng·ml−1 , while none of group A had such low values . MeanVO2max of group A had increased by 7.5 % following 21 days of training ( P⩽0.01 ) and by 15.3 % after 42 days . No appreciable increase inVO2max had occurred in group B by day 21 ( significantly lower thanVO2max of group A;P⩽0.05 ) , however by day 42 it had increased by 14.3 % ( P⩽0.05 ) . In both groups 2,3-DPG·g Hb−1 had increased significantly ( P⩽0.005 ) by day 7 ( 22 % ) and remained at that level for an additional 35 days . We concluded that a daily oral iron supplement given to young women during intensive training improved several haematological variables and their body iron status . This improvement was associated with an increasedVO2max only during the early stages of their training ( day 21 ) compared with the placebo group
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 .