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Nutrition

Soda smanjila 32 sekunde u ženskim 10‑km utrkama – Evo zašto

Dr. Gymbro · · 3 min read
#ergogenic aids #sports nutrition #endurance performance #sodium bicarbonate #baking soda #10k running #female runners

32‑sekundno otkriće sakriveno u jeftinoj tvari

Natrijev bikarbonat, sastojak u sodu za pecivo, poznat je među izdržljivim sportašima: može poboljšati performanse, ali često uzrokuje gastrointestinalnu nelagodu. Novo istraživanje objavljeno u International Journal of Sport Nutrition and Exercise Metabolism (Aktitiz et al., DOI: 10.1123/ijsnem.2026-0041) testiralo je ovaj suplement na grupi koju rijetko proučavamo – rekreativne trkačice. Ispitivanje je provedeno na otvorenom, na atletskoj stazi.

Rezultat: brži 10 km bez primjetnog porasta gastrointestinalnih simptoma.

Što su istraživači zapravo napravili

Dvadeset i jedna zdrava žena (prosječna dob 33,6 godine, VO₂max oko 48,6 ml·kg⁻¹·min⁻¹) odradila je dva testiranja na 10‑kilometarskoj stazi. Dizajn je bio randomiziran, dvostruko‑slijep i križni, pa je svaka trkačica istodobno bila i u kontrolnoj i u eksperimentalnoj skupini.

  • Suplement: natrijev bikarbonat (SB) u dozi od 0,3 g po kg tjelesne mase
  • Kontrola: 0,03 g po kg tjelesne mase kuhinjske soli
  • Obrok: standardizirani obrok bogat ugljikohidratima – 1,5 g po kg tjelesne mase – konzumiran zajedno sa SB ili placebom
  • Raspored uzimanja: 90 minuta prije vježbe
  • Kontrola faze ciklusa: oba pokušaja provedena su u istom dijelu menstrualnog ciklusa

Posljednji detalj je bitan – usuglašavanje faze ciklusa uklanja jedan izvor šuma koji mnoge studije kod žena zanemaruju.

Rezultati u brojkama

Nakon SB, žene su završile 10 km za 3 046,1 ± 208,7 s, nasuprot 3 078,4 ± 206,8 s s placebom (p = 0,011). To je otprilike 32 sekunde brže, odnosno oko 1 % u utrci koja traje oko 51 minutu.

Krvna kemija promijenila se onako kako se očekivalo:

  • Bazična pH vrijednost krvi: 7,47 s SB nasuprot 7,42 s placebom (p < 0,001)
  • Bazični bikarbonat: 27,7 mmol/L vs. 22,2 mmol/L (p < 0,001)
  • Obje su vrijednosti ostale povišene i nakon utrke u svim mjerenim vremenskim točkama (1, 3, 5 i 7 minuta post‑vježbe; p < 0,05)

Jednostavno rečeno, suplement je učinio krv alkalnijom prije početka trke, a taj učinak je potrajao i nakon završetka.

Gastrointestinalni problemi koji su izostali

Najčešća pritužba na bikarbonat je gastrointestinalna nelagoda – nadutost, mučnina i učestale posjete WC‑u. Istraživači su pratili simptome 30, 60 i 90 minuta nakon uzimanja. Nisu pronašli značajne razlike između SB i placeba (p > 0,05 za sve).

Autori opisuju ovu strategiju kao praktičnu i dobro podnošljivu. Dizajn studije sugerira da je obrok bogat ugljikohidratima najvjerojatnije ublažio moguće simptome, ali studija nije testirala SB bez hrane, pa ne može potvrditi da je upravo obrok spriječio nelagodu. Pokazuje samo da je kombinacija tolerirana u ovoj skupini.

Praktični vodič

  • Doza: 0,3 g natrijevog bikarbonata po kilogramu tjelesne mase. Trkačica od 60 kg uzima 18 g, od 70 kg – 21 g.
  • Ugljikohidrati: 1,5 g po kg tjelesne mase u obroku, što znači otprilike 90 g ugljikohidrata za osobu od 60 kg.
  • Raspored uzimanja: suplement i obrok konzumirati zajedno, 90 minuta prije trke.
  • Probna faza: studija ne garantira da će svi podnijeti dozu; preporučljivo je isprobati kombinaciju na treningu, a ne na dan utrke.

Tko bi trebao isprobati

Rezultati najviše odgovaraju zdravim, rekreativnim trkačicama u tridesetim godinama, s kondicijom sličnom sudionicama, koje redovito trče oko 10 km. Ako ste vi takvi i tražite način da skratite vrijeme, ovo je niskotarifna opcija o kojoj biste trebali razgovarati s kvalificiranim sportskim dijetetičarem ili trenerom.

Tko bi trebao izbjegavati (ili se najprije posavjetovati)

  • Osobe s visokim krvnim tlakom, bubrežnim bolestima ili bilo kojim medicinskim razlozima za ograničavanje unosa natrija trebaju se najprije posavjetovati s liječnikom.
  • Ako ste ikada prije imali gastrointestinalne probleme s bikarbonatom, budite oprezni – studija ne može predvidjeti individualne reakcije.
  • Trkači koji treniraju za znatno duže ili kraće udaljenosti ne bi trebali pretpostaviti da će imati isti učinak; testiran je samo 10 km.
  • Trudnice i osobe s kroničnim zdravstvenim problemima trebaju medicinsko savjetovanje.

Realnost: ograničenja studije

Uzorak je obuhvatio 21 ženu, pa je rezultat obećavajući, ali ne konačan. Trkačice su bile rekreativne, a ne elite. Ispitivana je samo jedna udaljenost na jednoj stazi. Sažetak ne navodi varijabilnost individualnih odgovora – neki mogu ostvariti veći, drugi manji dobitak. Poboljšanje od oko 1 % je značajno za one koji love osobni rekord, ali nije čudo.

Vrijedno je napomenuti da je studija koristila točno izračunatu dozu natrijevog bikarbonata. „Grabljenje“ žlice kuhinjske sode nije isto što i precizno mjerenje u gramima prema tjelesnoj težini.

Zaključak

Za rekreativne trkačice, pažljivo odmerena doza natrijevog bikarbonata uz obrok bogat ugljikohidratima 90 minuta prije 10‑km utrke poboljšala je performanse za oko 32 sekunde. Također je podigla pH i bikarbonat u krvi bez uočljivog porasta gastrointestinalnih simptoma. To je jeftin, ciljano eksperiment koji vrijedi isprobati u treningu, uz medicinski savjet kad je potrebno.

Izvor: Aktitiz et al., "Acute Sodium Bicarbonate Supplementation Enhances 10‑km Outdoor Track Running Performance in Recreational Female Runners," International Journal of Sport Nutrition and Exercise Metabolism. PubMed: 42926128.

Original study

Read the original research on pubmed.ncbi.nlm.nih.gov →

This article summarizes published research for general information. It is not medical advice.

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Dr. Gymbro

Dr. Gymbro writes for Dr. Gymbro: science-backed fitness, nutrition & performance.

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