Four weeks of IV iron supplementation reduces perceived fatigue and mood disturbance in distance runners
Journal article
Woods, Amy L., Garvican-Lewis, Laura A., Saunders, Philo U., Lovell, Greg, Hughes, David, Fazakerley, Ruth, Anderson, Bev, Gore, Christopher J. and Thompson, Kevin G.. (2014). Four weeks of IV iron supplementation reduces perceived fatigue and mood disturbance in distance runners. PLoS ONE. 9(9), pp. 1 - 11. https://doi.org/10.1371/journal.pone.0108042
Authors | Woods, Amy L., Garvican-Lewis, Laura A., Saunders, Philo U., Lovell, Greg, Hughes, David, Fazakerley, Ruth, Anderson, Bev, Gore, Christopher J. and Thompson, Kevin G. |
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Abstract | Purpose: To determine the effect of intravenous iron supplementation on performance, fatigue and overall mood in runners without clinical iron deficiency. Methods: Fourteen distance runners with serum ferritin 30–100 µg·L−1 were randomly assigned to receive three blinded injections of intravenous ferric-carboxymaltose (2 ml, 100 mg, IRON) or normal saline (PLACEBO) over four weeks (weeks 0, 2, 4). Athletes performed a 3,000 m time trial and 10×400 m monitored training session on consecutive days at week 0 and again following each injection. Hemoglobin mass (Hbmass) was assessed via carbon monoxide rebreathing at weeks 0 and 6. Fatigue and mood were determined bi-weekly until week 6 via Total Fatigue Score (TFS) and Total Mood Disturbance (TMD) using the Brief Fatigue Inventory and Brunel Mood Scale. Data were analyzed using magnitude-based inferences, based on the unequal variances t-statistic and Cohen's Effect sizes (ES). Results: Serum ferritin increased in IRON only (Week 0: 62.8±21.9, Week 4: 128.1±46.6 µg·L−1; p = 0.002) and remained elevated two weeks after the final injection (127.0±66.3 µg·L−1, p = 0.01), without significant changes in Hbmass. Supplementation had a moderate effect on TMD of IRON (ES -0.77) with scores at week 6 lower than PLACEBO (ES -1.58, p = 0.02). Similarly, at week 6, TFS was significantly improved in IRON vs. PLACEBO (ES –1.54, p = 0.05). There were no significant improvements in 3,000 m time in either group (Week 0 vs. Week 4; Iron: 625.6±55.5 s vs. 625.4±52.7 s; PLACEBO: 624.8±47.2 s vs. 639.1±59.7 s); but IRON reduced their average time for the 10×400 m training session at week 2 (Week 0: 78.0±6.6 s, Week 2: 77.2±6.3; ES–0.20, p = 0.004). Conclusion: During 6 weeks of training, intravenous iron supplementation improved perceived fatigue and mood of trained athletes with no clinical iron deficiency, without concurrent improvements in oxygen transport capacity or performance. |
Year | 2014 |
Journal | PLoS ONE |
Journal citation | 9 (9), pp. 1 - 11 |
Publisher | Public Library of Science |
ISSN | 1932-6203 |
Digital Object Identifier (DOI) | https://doi.org/10.1371/journal.pone.0108042 |
Scopus EID | 2-s2.0-84907452345 |
Open access | Open access |
Page range | 1 - 11 |
Research Group | Mary MacKillop Institute for Health Research |
Publisher's version | |
Place of publication | United States of America |
https://acuresearchbank.acu.edu.au/item/87q7v/four-weeks-of-iv-iron-supplementation-reduces-perceived-fatigue-and-mood-disturbance-in-distance-runners
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