Iron status in highly active and sedentary young women

Kathleen Woolf, Megan M. St. Thomas, Nicole Hahn, Linda A. Vaughan, Amanda G. Carlson, Pamela Hinton

Research output: Contribution to journalArticle

Abstract

This study examined iron status and nutrient intake in highly active (n = 28; 20 ± 2 yr, ≥12 hr purposeful physical activity per week [PPA/wk]) and sedentary (n = 28; 24 ± 3 yr, ≤2 hr PPA/wk) women. Participants completed a 7-day weighed-food record (energy, protein, fiber, alcohol, and micronutrients), 7-day pedometer/activity log, and fasting blood draw (hemoglobin, hematocrit, red blood cell indices, C-reactive protein, serum iron, percent transferrin saturation, total iron-binding capacity, ferritin, transferrin receptor [sTfR], and sTfR index). Independent-sample t tests and the Mann-Whitney nonparametric test compared mean values between groups. Lower serum ferritin (p = .01) and mean cell hemoglobin (p < .01) concentrations were found in active than in sedentary women. Higher mean sTfR (p = .01) and sTfR index (p < .01) values were found in the active women. No significant differences were found between groups for the other blood markers. Serum ferritin concentrations (storage iron) indicated iron depletion (Stage I) in 21% of active and 18% of sedentary participants. Nonetheless, 50% of active and 18% of sedentary participants were iron depleted as evidenced by the sTfR index (ratio of functional-to-storage iron). Elevated sTfR concentrations (functional iron) were observed in 25% of active and 3% of sedentary participants. Although the active women reported greater iron (p < .01) but similar heme iron intakes, they had higher mean sTfR, higher sTfR index, and lower serum ferritin concentrations than the sedentary women. Assessment of iron status may require measures not commonly used in routine assessments.

Original languageEnglish (US)
Pages (from-to)519-535
Number of pages17
JournalInternational Journal of Sport Nutrition and Exercise Metabolism
Volume19
Issue number5
StatePublished - Oct 2009

Fingerprint

Iron
Ferritins
Serum
Hemoglobins
Exercise
Food
Transferrin Receptors
Erythrocyte Indices
Micronutrients
Transferrin
Blood Group Antigens
Heme
Hematocrit
C-Reactive Protein
Fasting
Erythrocytes
Alcohols

Keywords

  • Dietary intake
  • Ferritin
  • Heme iron
  • Nonheme iron
  • Transferrin receptor

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics
  • Orthopedics and Sports Medicine

Cite this

Woolf, K., St. Thomas, M. M., Hahn, N., Vaughan, L. A., Carlson, A. G., & Hinton, P. (2009). Iron status in highly active and sedentary young women. International Journal of Sport Nutrition and Exercise Metabolism, 19(5), 519-535.

Iron status in highly active and sedentary young women. / Woolf, Kathleen; St. Thomas, Megan M.; Hahn, Nicole; Vaughan, Linda A.; Carlson, Amanda G.; Hinton, Pamela.

In: International Journal of Sport Nutrition and Exercise Metabolism, Vol. 19, No. 5, 10.2009, p. 519-535.

Research output: Contribution to journalArticle

Woolf, K, St. Thomas, MM, Hahn, N, Vaughan, LA, Carlson, AG & Hinton, P 2009, 'Iron status in highly active and sedentary young women', International Journal of Sport Nutrition and Exercise Metabolism, vol. 19, no. 5, pp. 519-535.
Woolf K, St. Thomas MM, Hahn N, Vaughan LA, Carlson AG, Hinton P. Iron status in highly active and sedentary young women. International Journal of Sport Nutrition and Exercise Metabolism. 2009 Oct;19(5):519-535.
Woolf, Kathleen ; St. Thomas, Megan M. ; Hahn, Nicole ; Vaughan, Linda A. ; Carlson, Amanda G. ; Hinton, Pamela. / Iron status in highly active and sedentary young women. In: International Journal of Sport Nutrition and Exercise Metabolism. 2009 ; Vol. 19, No. 5. pp. 519-535.
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