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Dr. Gymbro ·

Koliko proteina zaista maksimizira mišiće? Objašnjen prag od 1,6 g/kg

#meta analysis #protein #muscle growth #resistance training #whey protein #sports nutrition #strength

Kratki odgovor: ~1,6 g/kg dnevno

Ako trenirate s ciljem izgradnje mišića, velika meta‑analiza sugerira da je vaš dnevni cilj proteina niži nego što tvrde mitovi s teretane. Pregled, objavljen u British Journal of Sports Medicine, obuhvatio je 49 randomiziranih kontroliranih studija i 1.863 zdrava odrasla ispitanika. Analiza prelomne točke postavila je prag od 1,62 g proteina po kg tjelesne mase dnevno. Iznad te granice dodatni protein nije dodatno povećao dobitke u tjelesnoj masi bez masti (FFM) uz otporni trening.

Gornja granica 95 % intervala pouzdanosti iznosi otprilike 2,2 g/kg/dan. To vam daje praktičan raspon: 1,6 g/kg je točka od koje se dodatni učinak izjednačuje, a 2,2 g/kg je razumna maksimalna granica ako želite dodatni sigurnosni margina.

Kako to izgleda na tanjuru

Matematika je jednostavna:

  • 70 kg (154 lb): oko 112 g dnevno pri 1,6 g/kg, do oko 154 g pri 2,2 g/kg
  • 80 kg (176 lb): oko 128 g dnevno, do oko 176 g
  • 90 kg (198 lb): oko 144 g dnevno, do oko 198 g

Ove brojke predstavljaju ukupni dnevni unos proteina iz hrane i suplemenata zajedno. Nisu dodatak na ono što već unosite. Mnogi ljudi s uravnoteženom prehranom već su blizu tog cilja.

Što su pokazale studije

Istraživači su uključili samo randomizirane kontrolirane studije s najmanje šest tjedana otpornih vježbi u kojima je korišten dodatak proteina. U usporedbi s treninzima bez dodatka, dodatni protein donio je sljedeće prosječne poboljšanje:

  • Snaga (1RM): +2,49 kg
  • Masa bez masti: +0,30 kg
  • Presjek mišićnih vlakana: +310 µm²
  • Presjek srednjeg femura: +7,2 mm²

Sve je statistički značajno. Dobitci su stvarni, ali skromni. Dodatak proteina je pojačivač, a ne zamjena za progresivno preopterećenje, adekvatan unos kalorija i dosljedan trening.

Tko najviše profitira?

Analiza je identificirala dva moderirajuća faktora.

Iskusni teretančari. Dodatak proteina bio je učinkovitiji kod osoba koje već redovito treniraju otporno, donoseći dodatnih 0,75 kg FFM u usporedbi s manje iskusnim. Jedno moguće objašnjenje je da iskusniji sportaši imaju manje prostora za brze "newbie" dobitke, pa detalji prehrane postaju važniji.

Mlađi odrasli, a ne stariji. Učinak suplementacije na FFM smanjivao se s godinama, otprilike 0,01 kg po dodatnoj godini. To ne znači da stariji ne trebaju proteine – samo da su u tim studijama dodatni gramovi donijeli manji relativni učinak jer je bazna sposobnost mišića za odgovor na protein oslabljena. Stariji teretančari i dalje trebaju unositi adekvatan ukupan protein i ne smiju smatrati prag gornjom granicom.

Whey, šejkovi i prava hrana

Većina eksperimentalnih studija koristila je praktične, visokoproteinske proizvode poput whey praha i gotovih napitaka. Šejk je praktičan način da popunite prazninu: jedna porcija obično sadrži 20‑25 g proteina uz minimalnu pripremu. Istraživanje se odnosi na ukupan unos proteina, a ne na čarobni proizvod. Ako svoj cilj od 1,6 g/kg postignete iz pilećeg mesa, jaja, mliječnih proizvoda, mahunarki i tofua, logika praga ostaje ista.

Jednostavan pristup:

  1. Izračunajte svoj cilj (težina u kg × 1,6).
  2. Rasporedite ga kroz tri do pet obroka ili užina.
  3. Šejk koristite samo da popunite prazninu između onoga što jedete i cilja.
  4. Prestajte tražiti dodatne grame kad ste u zoni od 1,6‑2,2 g/kg.

Važne napomene

Vrijednost od 1,6 g/kg je prosječna prelomna točka, a ne čvrsto biološko ograničenje. Interval pouzdanosti pokriva širok raspon, pa pojedinačne potrebe variraju. Analiza je mjerila i masu bez masti, što je pokazatelj mišićne mase, ali uključuje i vodu, organe i druge netkane mase.

Autori su istaknuli potencijalni sukob interesa: glavni autor Stuart Phillips primio je financiranje i honorare od US National Dairy Council, koji je podržavao neke od uključenih studija. To ne poništava rezultate, ali je važno za čitatelje koji ih procjenjuju.

Pregled obuhvaća samo zdrave odrasle osobe. Ne odnosi se na osobe s bolestima bubrega ili drugim medicinskim stanjima; takvi pojedinci trebaju se posavjetovati s liječnikom o ciljevima proteina.

Zaključak

Za većinu ljudi koji treniraju s ciljem rasta mišića, oko 1,6 g/kg/dan je točka od koje donosi sve manje koristi, a 2,2 g/kg je razumna gornja granica. Konzumiranje značajno više vjerojatno neće ubrzati rast mišića. Usmjerite energiju na kvalitetu treninga, san, ukupni unos kalorija i dosljednost, a proteinske šejkove koristite samo kad im je potrebno da dosegnete svoj broj.

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