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Dr. Gymbro ·

Kreatin prije ili nakon treninga? Malo istraživanje sugerira prednost uzimanja nakon treninga

#supplements #sports nutrition #strength training #creatine #bodybuilding #muscle building #research

Jedno od najčešćih pitanja u teretani: treba li uzimati kreatin prije treninga ili nakon?

Studija iz 2013. u Journal of the International Society of Sports Nutrition pokušala je izravno odgovoriti na to. Njeni zaključci ukazuju na blagu preferenciju za doziranje nakon treninga. Podaci su tanji nego što naslovi sugeriraju i vrijedno ih je pročitati pažljivo.

Što su istraživači učinili

Jose Antonio i Victoria Ciccone s Nova Southeastern University registrirali su 19 zdravih, rekreativnih muških bodybuildera. Muškarci su nasumično raspoređeni u jednu od dviju skupina. Obje su skupine uzimale 5 g kreatina monohidrata. Jedna skupina (PRE‑SUPP) ga je uzimala odmah prije treninga, dok je druga (POST‑SUPP) uzimala odmah nakon treninga.

Tijekom četiri tjedna sudionici su slijedili periodiziranu, split‑routinu programa bodybuildinga otprilike pet dana u tjednu, s sesijama poput "chest‑shoulders‑triceps", "back‑biceps" i "legs". Na dane bez treninga uzimali su kreatin kad god im je to odgovaralo. Istraživači su pratili napredak mjerenjem sastava tijela pomoću BodPod‑a i testiranjem maksimalnog bench pressa (1‑RM). Također su analizirali dnevnike prehrane na četiri nasumična dana kako bi provjerili da prehrana ne izobličava rezultate.

Što su otkrili

Obje skupine su napredovale. Zabilježen je značajan učinak kroz vrijeme za bežeku masu (fat‑free mass) i za bench press, pa su sudionici u obje skupine postali mršaviji i jači tijekom mjeseca. Masno tkivo i ukupna tjelesna težina nisu se značajno promijenile.

Ključna poanta jest da formalni statistički test nije otkrio značajnu interakciju između skupine i vremena. Drugim riječima, studija nije uspjela pokazati da se skupine po vremenu uzimanja razlikuju više nego što bi slučajnost mogla objasniti. Prosjeci su ipak naginjali prema dozi nakon treninga:

  • Fat‑free mass: +0,9 kg (pre) vs. +2,0 kg (post)
  • Fat mass: -0,1 kg (pre) vs. -1,2 kg (post)
  • Body weight: +0,4 kg (pre) vs. +0,8 kg (post)
  • 1‑RM bench press: +6,6 kg (pre) vs. +7,6 kg (post)

Unos kalorija i makronutrijenata nije se razlikovao između skupina, pa je prehrana vjerojatno nije uzrok razlike.

Zašto je tvrdnja o post‑treningu slaba

Autori su koristili magnitude‑based inference, metodu koja procjenjuje koliko je vjerojatno da je pravi učinak značajno velik, umjesto da se oslanja na binarni p‑vrijednosni prag. Po tom pristupu, kreatin uzet nakon treninga ocijenjen je kao "possibly more beneficial" (moguće korisniji) za bežeku masu, masno tkivo i bench press. Riječ "possibly" namjerno je oprezna.

Magnitude‑based inference je također kritiziran od strane statističara koji tvrde da može precijeniti dokaze u malim uzorcima. Uz to, postoji još nekoliko ograničenja koja dodatno zamagljuju sliku:

  • Mali uzorak: 19 osoba podijeljeno u dvije skupine ostavlja vrlo malo statističke snage.
  • Velika varijabilnost: Standardna devijacija je velika u odnosu na razlike. Bežeka masa kod pre‑trening grupe promijenila se za 0,9 ± 1,8 kg, pa su neki pojedinci vjerojatno izgubili masu.
  • Kratko razdoblje: Četiri tjedna su kratko, a učinci kreatina se akumuliraju tijekom vremena.
  • Uska populacija: Sudjelovali su jedino mladi, muški, rekreativni bodybuilderi.
  • Nedostatak placeba ili kontrolne grupe: Studija uspoređuje vrijeme uzimanja, a ne kreatin nasuprot ništa.

Stoga se studija najbolje tretira kao generiranje hipoteze, a ne konačna presuda.

Plausibilan mehanizam, ali ne dokazan

Lako je zamisliti zašto bi doziranje nakon treninga moglo pomoći. Vježbanje povećava protok krvi do radnih mišića i može pojačati unos nutrijenata u satima koji slijede, pa bi kreatin uzet tada mogao biti učinkovitije apsorbiran. Da li se to pretvara u stvarnu prednost još nije dokazano, a ova studija nije izravno mjerila razinu kreatina u mišiću. Ideja ostaje razumna spekulacija.

Praktični zaključci

Za većinu dizača, korisna poruka više se odnosi na dosljednost nego na točan čas.

  1. Uzimajte oko 5 g kreatina monohidrata dnevno. To je doza korištena u studiji i široko prihvaćena količina za održavanje.
  2. Ako želite razlučivanje, uzmite ga nakon treninga. Mali signal favorizira post‑workout, a nema dokaza da je takav izbor štetan.
  3. Ne preskačite dane odmora. Kreatin djeluje zasićivanjem zaliha u mišiću kroz vrijeme, pa je dnevni unos važniji od preciznog vremena uzimanja.
  4. Kombinirajte ga s otporenim treningom i adekvatnom prehranom. Obje skupine su dobile snagu i mišićnu masu samo uz naporan program treninga.
  5. Odaberite vrijeme koje ćete stvarno poštovati. Ako vam bolje odgovara uzimati kreatin prije treninga, dokazi ne govore da ćete na bilo koji pouzdan način gubiti.

Konačni zaključak

Naslovna verzija, "kreatin nakon treninga nadmašuje kreatin prije treninga", je samouvjerenija od podataka. Studija pokazuje da su kreatin i dizanje utega poboljšali bežeku masu i bench press, te da je doziranje nakon treninga lagano vodilo u prosjeku, ali bez postizanja konvencionalne statističke značajnosti. Potrebna je veća, duža studija s uključenim ženama i starijim osobama, uz izravna mjerenja kreatina u mišiću, da bi se pitanje razriješilo. Do tada, uzmite svojih 5 g dnevno, po mogućnosti nakon treninga, i usmjerite energiju na ono što je važnije: progresivno opterećenje, proteine i san.

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