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Day to day variability in the transferrin receptor/ferritin index in female athletes
R Stupnicki1, J Malczewska, K Milde
1Department of Biometry, Academy of Physical Education, Warsaw, Poland. rstupnicki@awf.edu.pl
Objective:
To determine the within subject (day to day) variability for variables reflecting iron status (concentrations of ferritin and soluble transferrin receptor (sTfR), and the sTfR/logFerr index) in female athletes during a training camp, and in female control subjects.
Results:
The error for ferritin concentration was nearly twice as high in athletes as in controls, that for sTfR concentration was identical in the two groups, and that for the sTfR/logFerr index was about 50% higher in athletes than in controls.
Conclusions:
The within subject, day to day error for the sTfR/logFerr index computed from data recorded for untrained subjects cannot serve as a reference value for training athletes. When the sTfR/logFerr index is used to monitor iron stores in athletes, an error value of 0.20 should be used, because determination of the index after a few days of rest may not be feasible.
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