Sex-specific relationships among iron status biomarkers, athletic performance, maturity, and dietary intakes in pre-adolescent and adolescent athletes

Shoemaker, Marni E.; Gillen, Zachary M.; Mckay, Brianna D.; Bohannon, Nicholas A.; Gibson, Sydney M.; Koehler, Karsten; Cramer, Joel T.

doi:10.1186/s12970-019-0306-7

Document type:: Zeitschriftenaufsatz
Author(s):: Shoemaker, Marni E.; Gillen, Zachary M.; Mckay, Brianna D.; Bohannon, Nicholas A.; Gibson, Sydney M.; Koehler, Karsten; Cramer, Joel T.
Title:: Sex-specific relationships among iron status biomarkers, athletic performance, maturity, and dietary intakes in pre-adolescent and adolescent athletes
Abstract:: Background The purpose of this study was to examine relationships among biomarkers of iron status, athletic performance, growth and development, and dietary intakes in pre-adolescent and adolescent male and female athletes. Methods Two-hundred and forty-nine male (n = 179) (mean ± standard deviation for age = 12.0 ± 2.1 years, height = 156.3 ± 13.9 cm, and weight = 49.1 ± 16.5 kg) and female (n = 70) (12.0 ± 2.2 years, 152.4 ± 12.3 cm, 45.3 ± 14.5 kg) athletes volunteered for capillary blood sample, anthropometric, athletic performance, and dietary intake assessments. Outcomes included maturity offset from peak height velocity, percent body fat, estimated muscle cross-sectional areas, vertical jump height (VJ), broad jump distance (BJ), pro-agility time (PA), L-cone time, 20-yard dash time (20YD), power push up (PPU) force, dietary intakes, and ferritin, soluble transferrin receptor (sTfR), and hemoglobin (Hb) concentrations. Results Athletic performance was consistently correlated with Hb in males (r = .237–.375, p < 0.001–0.05) and with sTfR (r = .521–.649, p < 0.001–0.004) and iron intake (r = .397–.568, p = 0.001–0.027) in females. There were no relationships between dietary intakes and ferritin, sTfR, or Hb (p > 0.05). After partialing out age and height, VJ, PA, LC, and 20YD remained correlated with Hb in males (|rHb,y.Age| = .208–.322, p = 0.001–0.041; |rHb,y.Height| = .211–.321, p = 0.001–0.038). After partialing out iron intake, PA and LC remained correlated with sTfR in females (|rsTfR,y.ironintake| = .516–.569, p = 0.014–0.028). Conclusions Iron status biomarkers demonstrated sex-specific relationships with anaerobic exercise performance in youth athletes, which may be more dependent on maturity status and dietary intake than age. Moderate relationships between sTfR and athletic performance in adolescent female athletes emphasizes the importance of iron intake in this demographic.
Keywords:: Youth athletes, Exercise, Nutrition,Athletic performance, Iron
Dewey Decimal Classification:: 570 Biowissenschaften, Biologie; 610 Medizin und Gesundheit; 790 Sport, Spiele, Unterhaltung
Journal title:: Journal of the International Society of Sports Nutrition
Year:: 2019
Journal volume:: 16
Journal issue:: 1
Reviewed:: ja
Language:: en
Fulltext / DOI:: doi:10.1186/s12970-019-0306-7
Pubmed ID:: http://view.ncbi.nlm.nih.gov/pubmed/31533743
WWW:: https://jissn.biomedcentral.com/articles/10.1186/s12970-019-0306-7
Publisher:: Springer Science and Business Media LLC
E-ISSN:: 1550-2783
Impact Factor:: 3.841
Status:: Verlagsversion / published
Date of publication:: 18.09.2019
Semester:: SS 19
TUM Institution:: Professur für Bewegung, Ernährung und Gesundheit
Format:: Text
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