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Markers of iron status in highly active and sedentary young women
Author(s) -
St. Thomas Megan M.,
Woolf Kathleen,
Hahn Nicole L.,
Vaughan Linda A.,
Hinton Pamela S.,
Carlson Amanda
Publication year - 2008
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.22.1_supplement.694.11
Subject(s) - transferrin , transferrin receptor , ferritin , soluble transferrin receptor , transferrin saturation , iron status , medicine , endocrinology , hemoglobin , serum iron , hematocrit , total iron binding capacity , body mass index , sedentary behavior , chemistry , iron deficiency , anemia , serum ferritin , obesity
Study examined iron status in highly active (n=28; 20±2 y; ≥ 12 h purposeful physical activity [PPA] per week) and sedentary women (n=28; 24±3 y; ≤ 2 h PPA per week). Subjects completed a 7‐day weighed food record and blood draw [hemoglobin, hematocrit, C‐reactive protein, serum iron, % transferrin saturation, total iron binding capacity (TIBC), ferritin, transferrin receptor, transferrin receptor index]. Independent t‐tests compared mean values between groups. Reported intakes of energy (p<0.01), protein (p<0.01), iron (p<0.01), and non‐heme iron (p<0.01) were higher in active versus sedentary women. Higher mean transferrin receptor concentration (p<0.01) and transferrin receptor index (p<0.01) were found in active versus sedentary women. No significant differences were found between groups for other blood markers. Serum ferritin concentrations indicated iron depletion in 21% of active and 17% of sedentary women. Yet, 50% of active and 17% of sedentary participants were iron depleted as evidenced by the transferrin receptor index. Elevated serum transferrin receptor concentrations were observed in 14% of active and 3% of sedentary women. Although active women reported greater intake of iron, they had higher mean transferrin receptor and higher transferrin receptor index than sedentary women. Assessment of iron status in active women may require measures not commonly used in routine assessments.