Ferritin readings in young adult, female university student recreational runners.

Elite female athletes have shown vulnerability to various degrees of iron deficiency. Less is known about recreational fitness exercisers. A study was done to examine plasma ferritin, an assessor of iron status, in young adult, university student fitness runners. The present study examined serum ferritin concentrations, an indicator of iron status, in 39 female university students (age 18-25) who ran for fitness, but ran less than competition runners. Selected subjects all reported themselves as not anemic. Mean + SD for 3 mile run time was 26.25 + 3.0 min. The mean ferritin reading was low: 12.4 + 12.3 ng/mL (+ SD). Out of the 39 women, 29 had readings that fell below 15 ng/mL, which some consider the cutoff for iron deficiency. In addition, all but 2 subjects had values below 35, which has been proposed as Stage 1 iron deficiency for athletes. Ferritin levels did not correlate with 3 mile run times (Pearson correlation coefficient, P > 0.05). A 1 mo intervention with 3 minerals that included iron (36 mg/day) significantly raised ferritin values when the iron was bisglycinate (p < 0.05), but not when it was ferrous sulfate (p > 0.05). In this study, a degree of iron deficiency was seen in most of a group of female fitness runners (each of whom had self reported as not being anemic).