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Inclusion and exclusion criteria for the study participants
| Total N | Supplemented group N | Control group N | |
|---|---|---|---|
| Inclusion criteria | |||
| • Male athletes qualified to Polish Youth Rowing Team (age 19–23 years), with physician-certified permission to participate in trainings and competition | • 19 | • 10 | • 9 |
| Exclusion criteria | • 3 | • 1 | • 2 |
| • Medication intake (inflammatory drags, medications known to affect iron metabolism) | • 2 | • 1 | • 1 |
| • Injury excluding participation in trainings | • 1 | • 0 | • 1 |
