Program and book of abstracts 1st conference

October 17 th – 20 th , 2022, Congress Centre of Slovak Academy of Sciences, Smolenice castle, Slovakia

Krejci Jakub

Is an assistant professor at the Department of Natural Sciences in Kinanthropology, Faculty of Physical Culture, Palacky University Olomouc, where he teaches the course Biophysics. His main areas of research and publications include the use of molecular hydrogen in sports medicine, the effects of normobaric hypoxia on the human body and assessment of cardiac autonomic regulation by heart rate variability. He is also involved in the development of diagnostic devices and biosignal processing. He has authored or co-authored 17 scientific articles on Web of Science with 117 citations, h-index 6.

DOSE-RESPONSE OF HYDROGEN RICH WATER ON PERCEIVED MUSCLE SORENESS IS MODERATED BY AGE Jakub Krejčí 1 , Michal Botek 1 1 Department in Natural Sciences in Kinanthropology, Faculty of Physical Culture, Palacky University Olomouc, Olomouc, Czech Republic BACKGROUND: In sport medicine, molecular hydrogen has emerged as a supplement that can enhance exercise performance or promote better recovery. However, the optimal dosage of hydrogen is still unknown. OBJECTIVES: To study whether the effect of hydrogen rich water (HRW) administered in a four-pack dose provides a better reduction in perceived muscle soreness compared to a two-pack dose. METHODS: A total of 38 Czech first league soccer players aged 25.1 ± 4.7 years were divided into two groups with different dosing strategies. The first group (n = 20) received two packages before and in the middle of the match. The second group received four packages, additionally two packages were received after the match. The package contained 420 ml of HRW (hydrogen concentration 0.9 ppm) or placebo, and the waters were reversed after a one-week washout. Muscle soreness was assessed on the morning of the day after the match using a visual analogue scale, a standardized 100 mm long line with extreme values of 0 (no soreness) and 100 (maximum soreness). RESULTS: HRW significantly reduced muscle soreness in the two packages (HRW: 48 ± 17, placebo: 59 ± 11, p < 0.001) and the four packages (HRW: 42 ± 8, placebo: 61 ± 11, p < 0.001). However, correlation analysis revealed that the differences (HRW versus placebo) were differently correlated with age. For the two packages, the differences were not significantly correlated (r = 0.22, p = 0.36), whereas a significant negative correlation was found for the four packages (r = -0.48, p = 0.044). CONCLUSIONS: Although the two dosing strategies provided similar changes in mean values, they differed when individual responses were assessed. Therefore, when studying the effect of molecular hydrogen, it is recommended not only to compare mean effect but also to study individual responses and their possible predictors.

41