In IDNA adults  , iron supplementation is associated with reduced subjective measures of fatigue but not with objective improvements in physical capacity .
OBJECTIVE Iron supplementation in iron-deficiency anaemia is st and ard practice , but the benefits of iron supplementation in iron-deficient non-anaemic ( IDNA ) individuals remains controversial .
Our objective is to identify the effects of iron therapy on fatigue and physical capacity in IDNA adults .
Effect of iron injections on aerobic-exercise performance of iron-depleted female athletes.
This investigation examined the effect of intramuscular iron injections on aerobic-exercise performance in iron-deficient women . Sixteen athletes performed a 10-min steady-state submaximal economy test , a VO2max test , and a timed test to exhaustion at VO2max workload . Subjects were r and omly assigned to an iron-supplemented group ( IG ) receiving intramuscular iron injections or to a placebo group ( PG ) . Twenty days after the first injection , exercise and blood testing were repeated . A final blood test occurred on Day 28 . Post supplementation , no differences were found between the groups ' submaximal or maximal VO2 , heart rate , or blood lactate ( P > 0.05 ) . Time to exhaustion was increased in the IG ( P < 0.05 ) but was not greater than that of the PG ( P > 0.05 ) . The IG 's serum ferritin ( SF ) was significantly increased on Days 20 and 28 ( mean + /- st and ard error : 19 + /- 3 to 65 + /- 11 to 57 + /- 12 microg/L ; P < 0.01 ) , with a percentage change from baseline significantly greater than in the PG ( P < 0.01 ) . It was concluded that intramuscular iron injections can effectively increase SF without enhancing submaximal or maximal aerobic-exercise performance in iron-depleted female athletes
In IDNA adults  , iron supplementation is associated with reduced subjective measures of fatigue but not with objective improvements in physical capacity .
OBJECTIVE Iron supplementation in iron-deficiency anaemia is st and ard practice , but the benefits of iron supplementation in iron-deficient non-anaemic ( IDNA ) individuals remains controversial .
Our objective is to identify the effects of iron therapy on fatigue and physical capacity in IDNA adults .