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Table 3 Changes in laboratory parameters before and after the intervention period

From: Hungarian male water polo players’ body composition can predict specific playing positions and highlight different nutritional needs for optimal sports performance

Variables

Before the start of the championship

After the championship

T-test value

Laboratory parameters

RBC sink (mm/h)

5.158 ± 1.214

5.895 ± 1.560

1.625

Haematocrit (l/l)

0.423 ± 0.025

0.454 ± 0.024

3.970**

RBC number (T/l)

4.892 ± 0.235

5.213 ± 0.291

3.739**

Glucose (mmol/l)

4.934 ± 3.071

4.784 ± 3.057

− 0.150

Creatinine (μmol/l)

124.105 ± 71.294

109.948 ± 7.322

− 0.861

Gamma GT (U/l)

20.263 ± 8.451

19.105 ± 7.415

− 0.449

GPT U/l

30.737 ± 15.307

27.263 ± 8.918

− 0.855

GOT U/l

41.316 ± 33.721

30.895 ± 10.225

− 1.289

Ferritin (μmol/l)

23.542 ± 5.798

24.311 ± 5.711

0.412

Leukocyte (g/l)

5.488 ± 1.119

5.679 ± 1.163

0.516

Urea (mmol/l)

7.533 ± 1.530

6.521 ± 1.618

− 1.979

Creatine kinase U/l

453.421 ± 196.992

321.421 ± 156.568

− 2.287*

Uric acid (μmol/l)

280.210 ± 73.367

320.842 ± 47.754

2.023*

Hemoglobin (g/l)

168.579 ± 85.381

148.000 ± 6.807

− 1.047

Cholesterol (mmol/l)

4.186 ± 0.723

4.492 ± 0.884

1.167

HDL-cholesterol (mmol/l)

1.531 ± 0.225

1.637 ± 0.195

1.556

LDL-cholesterol (mmol/l)

2.448 ± 0.583

2.649 ± 0.764

0.909

Triglyceride (mmol/l)

0.501 ± 0.174

0.684 ± 0.152

3.458**

Sodium (mmol/l)

140.579 ± 2.269

140.000 ± 1.732

− 0.884

Potassium (mmol/l)

4.121 ± 0.303

4.332 ± 0.328

2.054*

Magnesium (mmol/l)

0.876 ± 0.069

0.867 ± 0.053

− 0.447

Calcium (mmol/l)

2.363 ± 0.107

2.356 ± 0.077

− 0.245

Vitamin D (nmol/l)

132.963 ± 40.790

111.363 ± 36.185

− 1.727

Vitamin B12 (pmol/l)

378.158 ± 183.881

381.368 ± 123.812

0.063

  1. RBC red blood cell, Gamma GT gamma-glutamyl transferase, GPT glutamate-pyruvate-transaminase, GOT glutamate–oxaloacetate-transaminase
  2. Statistical significance was designated by **p ≤ 0.01, *p ≤ 0.05