Document Detail


A case study of an iron-deficient female Olympic 1500-m runner.
MedLine Citation:
PMID:  23436684     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This case study examines the impact of low serum ferritin (sFe) on physiological assessment measures and performance in a young female 1500-m runner undertaking approximately 95-130 km/wk training. The study spans 4 race seasons and an Olympic Games. During this period, 25 venous blood samples were analyzed for sFe and hemoglobin (Hb); running economy, VO(2max), and lactate threshold were measured on 6 occasions separated by 8-10 mo. Training was carefully monitored including 65 monitored treadmill training runs (targeting an intensity associated with the onset of blood lactate accumulation) using blood lactate and heart rate. Performances at competitive track events were recorded. All data were compared longitudinally. Mean sFe was 24.5 ± 7.6 μg/L (range 10-47), appearing to be in gradual decline with the exception of 2 data points (37 and 47 μg/L) after parenteral iron injections before championships, when the lowest values tended to occur, coinciding with peak training volumes. Each season, 1500-m performance improved, from 4:12.8 in year 1 to 4:03.5 in year 4. VO(2max) (69.8 ± 2.0 mL · kg(-1) · min(-1)) and running economy (%VO(2max) at a fixed speed of 16 km/h; max 87.8%, min 80.3%) were stable across time and lactate threshold improved (from 14 to 15.5 km/h). Evidence of anemia (Hb <12 g/dL) was absent. These unique data demonstrate that in 1 endurance athlete, performance can continue to improve despite an apparent iron deficiency. Raising training volume may have caused increased iron utilization; however, the effect of this on performance is unknown. Iron injections were effective in raising sFe in the short term but did not appear to affect the long-term pattern.
Authors:
Charles R Pedlar; Gregory P Whyte; Richard Burden; Brian Moore; Gill Horgan; Noel Pollock
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Publication Detail:
Type:  Case Reports; Journal Article     Date:  2013-02-20
Journal Detail:
Title:  International journal of sports physiology and performance     Volume:  8     ISSN:  1555-0265     ISO Abbreviation:  Int J Sports Physiol Perform     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-11-06     Completed Date:  2013-12-17     Revised Date:  2014-02-11    
Medline Journal Info:
Nlm Unique ID:  101276430     Medline TA:  Int J Sports Physiol Perform     Country:  United States    
Other Details:
Languages:  eng     Pagination:  695-8     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Anemia, Iron-Deficiency / drug therapy,  physiopathology*
Athletes*
Athletic Performance / physiology*
Female
Ferric Compounds / therapeutic use
Ferritins / blood
Hematinics / therapeutic use
Hemoglobins / analysis
Humans
Injections, Intravenous
Lactic Acid / blood
Oxygen Consumption / physiology
Running / physiology*
Sucrose / therapeutic use
Young Adult
Chemical
Reg. No./Substance:
0/Ferric Compounds; 0/Hematinics; 0/Hemoglobins; 0/iron(III)-hydroxide sucrose complex; 33X04XA5AT/Lactic Acid; 57-50-1/Sucrose; 9007-73-2/Ferritins
Comments/Corrections
Erratum In:
Int J Sports Physiol Perform. 2014 Jan;9(1):187

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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