بررسی آهن تکمیلی بر وضعیت آهن وکارایی جسمانی زنان ورزشکار

ABSTRACT storile o In a randomized controlled trial ,the influence of iron supplementation and exercise was studied . 28 normal women with age 18-25 (Mean 21.8+2.3) years were randomly selected in 2 groups of placebo and iron treatment (50 mg iron/day as Feso4) in a Sport Club of Tehran, exercised at least three days per week at 70-80% of maximal heart rate for 12 weeks. Fasting venous blood samples were obtained for hemoglobin (Hb), hematocrit (HC),serum iron total iron binding capacity (TIBG),transferin saturation (TS) and ferritin determination at weeks 0,4,8 and 12 .VO2max consumption test to assess cardiovascular fitness were conducted at baseline and after 12 week of exercise. subjects also completed 3 - day dietary records prior to the start of the study and again during the 12th week of exercise. Mean VO2max increased for both placebo and iron supplementation groups. Iron improvement of 12.5% in placebo group was observed. The change in VO2max was not significantly different between groups.No significant differences were observed in hematocrit, serum iron ,TIBC and TS between groups at weeks of 0,4,8 and 12. Ferritin levels in the iron supplementation group increased(from 2635 to 18+6 ug/dl at week 12). Mean hemoglobin level in the placebo group dropped from baseline to the week 4(from 13.8£0.6 to 12.3+0.7 g/dl)and then rose gradually at weeks of 8 and 12(from 12.5£0.6 to 12.7:0.7 g/dl),while mean Hb value in the iron supplementation group (from 2635 to 18+16 ug/dl at week 12). Mean hemoglobin level in the placebo group dropped from baseline to the week 4(from 13.5+0.6 to 12.7+0.7 g/dl), while mean Hb value in the iron supplementation group remaind fairly constant (from 13.3+0.3 to 13.5+0.3 g.dl at the week 12). There were no significant differences in energy and dietary intakes between groups at baseline and week 12. Increases in maximal O2 consumption (VO2 max)in both groups indicated improved cardiovascular fitness. Women in the placebo group tended to have short er exercise sessions than those in the iron supplementation group.This could be due to the effect of iron supplement leading to the improvement of iron stores in moderately exercising women. These differences most likely account for lower percent improvement in the placebo group.