20.500.12556/RUL-166405 The effects of sodium hydrogen carbonate ingestion during the recovery period between two 200-m front-crawl time trials Purpose The aim of this study was to determine how sodium hydrogen carbonate (NaHCO$_3$) ingestion during a 1-h recovery period after a 200-m front-crawl swim affects blood–gas levels, acid–base balance, and performance during a successive trial. Methods Fourteen national-level male swimmers (age: 21 ± 3 years, body mass (BM): 77 ± 10 kg, stature: 181 ± 7 cm) performed four maximal 200-m front-crawl tests. On one of the two days, the swimmers swam two 200-m tests with a 1-h recovery break, during which they drank water (WATER); on the other day, they performed the same protocol but consumed 0.3 g min$^{−1}$ NaHCO$_3$ solution during the recovery break (NaHCO$_3$). Results The ingestion of NaHCO$_3$ before the second test had no effect on swim time despite a greater [HCO$^−_3$] (19.2 ± 2.3 mmol L$^{−1}$) than that measured during the first test (NaHCO$_3$) (14.5 ± 1.1 mmol L$^{−1}$) and the other two tests (WATER) (12.7 ± 2.4 and 14.8 ± 1.5 mmol L$^{−1}$; F = 18.554; p = 0.000) and a higher blood pH (7.46 ± 0.03) than that measured during the first test (NaHCO$_3$) (7.39 ± 0.02) and the other two tests (WATER) (7.16 ± 0.04 and 7.20 ± 0.05); (F = 5.255; p = 0.004). An increase in blood pCO$_2$ (0.2 ± 0.3 kPa) between both tests (NaHCO$_3$) compared to unchanged pCO$_2$ values (− 0.1 ± 0.3 kPa) between the other two tests (WATER) (t = − 2.984; p = 0.011; power = 0.741) was confirmed. Conclusions NaHCO$_3$ ingestion during the recovery period between two 200-m front-crawl time trials had a strong buffering effect that did not positively affect performance. An increase in pCO$_2$ may have counterbalanced this impact. blood alkalosis acidosis blood gases acid–base balance medicina alkaloza krvi acidoza plini v krvi kislinsko-bazično ravnovesje tekmovalni plavalci true false true Angleški jezik Slovenski jezik Članek v reviji 2025-01-10 10:54:51 2025-01-10 10:54:53 2025-01-11 04:01:41 0000-00-00 00:00:00 2024 0 0 Str. 3191–3199 iss. 11 Vol. 124 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 612.74 1439-6327 10.1007/s00421-024-05522-2 199034371 s00421-024-05522-2_(1).pdf s00421-024-05522-2_(1).pdf 1 FAB5E4B47D9E6AC89EB4F2BA43D41471 a85ca44268043d39ec1021042b3bb5f50388297494223c2f2d90573b2a17fc66 c70c1c85-cf38-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=198006 https://link.springer.com/article/10.1007/s00421-024-05522-2 1 3734cbbf-cf38-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=198005 Fakulteta za šport 0 0 0