The data of 16 trained men from the Polish Youth National Rowing. All athletes presented as medically fit, with no underlying health problems. In this cohort, baseline serum ferritin levels were considered, and the athletes were divided into two groups: 1. Serum ferritin \<75 ng/ml (SF\<75): n=9 2. Serum ferritin \>75 ng/ml (SF\>75): n=7 The rowing test was performed at the beginning of the preparatory phase of the annual training cycle (April), which is characterized by high volume and training load. After a 5-min of individual warm-up, the athletes performed a 2000-m exercise test on a rowing ergometer (Concept II, USA). Blood samples took from the cubital vein at three time points: before stress test (pre-exercise), one minute after the end of the test (post-exercise), and after a 1-hour recovery period (1h recovery). Measurements ferritin, transferrin, hepcidin and interleukin-6 (IL-6) levels were determined using ELISA kits (SunRed Biotechnology Company). The iron levels were determined on the SPECTROstar Nano reader.
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Ferritin
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
Iron
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
Interleukin-6 (Il-6)
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
Hepcidin
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
Transferrin
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
The Blood morphology - RBC (Red Blood Cells)
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
The Blood morphology- HGB (Hemoglobin)
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
The Blood morphology- HCT (Hematocrit)
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
The Blood morphology- MCV (Mean Corpuscular Volume)
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
The Blood morphology- MCH (Mean Corpuscular Hemoglobin)
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
The Blood morphology- MCHC (Mean Corpuscular Hemoglobin Concentration)
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.
The Blood morphology- RDW (Red Blood cells Distribution Width)
Timeframe: At rest (before the test), directly after the test, and after a 1-hour recovery period.