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J Appl Physiol 88: 1103-1111, 2000;
8750-7587/00 $5.00
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Vol. 88, Issue 3, 1103-1111, March 2000

Iron supplementation improves endurance after training in iron-depleted, nonanemic women

Pamela S. Hinton, Christina Giordano, Thomas Brownlie, and Jere D. Haas

Division of Nutritional Sciences, Cornell University, Ithaca, New York 14853

Our objective was to investigate the effects of iron depletion on adaptation to aerobic exercise, assessed by time to complete a 15-km cycle ergometer test. Forty-two iron-depleted (serum ferritin <16 µg/l), nonanemic (Hb >12 g/dl) women (18-33 yr old) received 100 mg of ferrous sulfate (S) or placebo (P) per day for 6 wk in a randomized, double-blind trial. Subjects trained for 30 min/day, 5 days/wk at 75-85% of maximum heart rate for the final 4 wk of the study. There were no group differences in baseline iron status or in 15-km time. Iron supplementation increased serum ferritin and decreased transferrin receptors in the S compared with the P group. The S and P groups decreased 15-km time and respiratory exchange ratio and increased work rate during the 15-km time trial after training. The decrease in 15-km time was greater in the S than in the P group (P = 0.04) and could be partially attributed to increases in serum ferritin and Hb. These results indicate that iron deficiency without anemia impairs favorable adaptation to aerobic exercise.

iron deficiency; endurance capacity; aerobic training; serum transferrin receptors


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