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Nutrition

Prekursor kreatina nadmašio kreatin monohidrat u snazi stiska ruke kod starijih od 65 godina

Dr. Gymbro · · 4 min read
#supplements #creatine #grip strength #older adults #sarcopenia #gaa #guanidinoacetic acid

Jeftiniji i manje poznati rođak kreatina upravo je nadmašio zlatni standard suplementacije po pitanju snage hvatanja kod osoba starijih od 65 godina

Pre nego što izmenite svoj suplementacijski program, pročitajte sitni štampa: radi se o malom, osmonedeljnom pilot‑studijumu sa 21 završenim učesnikom, bez programa vežbanja i sa intervalima poverenja koji jedva izlaze iz nule. Rezultati su zanimljivi i vredni praćenja, ali ne predstavljaju razlog za odbacivanje kreatin monohidrata.

Šta je GAA i zašto ga upoređivati sa kreatinom?

Guanidinoacetična kiselina (GAA) je neposredni metabolički prethodnik kreatina. U organizmu se GAA sintetizuje u bubrezima, a zatim metiluje u jetri kako bi se formirao kreatin. Taj poslednji korak zahteva metil‑grupu koju donira S‑adenozil‑metionin (SAMe).

Istraživači su pretpostavili da starenje može oslabiti sintezu i transport kreatina. Ako je to slučaj, suplementacija prethodnikom mogla bi zaobići ta „uska grla“ i drugačije uticati na energetiku mišića i proteinometabolizam, u poređenju sa samim kreatinom. Kreatin već pomaže starijim osobama, naročito u kombinaciji sa otporni treningom, ali rezultati bez vežbanja su manje konzistentni. Upravo tu je bila praznina koju je ovo istraživanje želelo da popuni.

Kako je studija sprovedena

Studija, objavljena u Journal of Nutritional Science and Vitaminology (2026; 72(4):284‑290), potekla je iz Ostojićeve laboratorije primenjene bioenergije i saradnika. Bila je randomizovana, dvostruko‑slepa i jasno označena kao pilot‑studija.

  • Učesnici: 25 relativno zdravih osoba starijih od 65 godina nasumično je raspoređeno; 21 je završilo studiju (GAA n=11, kreatin n=10).
  • Intervencija: 2,0 g/dan GAA naspram ekvimolarne doze kreatin monohidrata tokom 8 nedelja. Prema mojim proračunima, to iznosi otprilike 2,5 g kreatin monohidrata, s obzirom na različite molekularne mase.
  • Nije bilo strukturiranog vežbanja u protokolu.
  • Ishodi: snaga hvatanja, telesna kompozicija i tečnosti merene multifrekventnom bioelektričnom impedansom (BIA), kao i krvni markeri: miostatin, IGF‑1, mTOR, totalni homocistein, albumin i ukupni protein.

Usklađenost je premašila 97 % u obe grupe, a neželjeni događaji nisu prijavljeni.

Rezultati: snaga hvatanja, mišićna masa, miostatin

Snaga hvatanja – značajno je porasla kod GAA (p=0,01), dok kod kreatina nije. Interakcija vremena i tretmana bila je značajna (p=0,04), a efekat između grupa velik je u korist GAA (Hedges' g=0,91). 95 % interval pouzdanosti iznosio je od 0,00 do 1,81. Donja granica koja dotiče nulu znači da stvarna prednost može biti od neznatne do vrlo velike.

Telesna kompozicija – na BIA‑u je grupa GAA pokazala značajne unutar‑grupne poraste u beztelesnoj masi, telesnoj ćelijskoj masi, mišićnoj masi i ukupnoj telesnoj vodi. Grupa kreatin nije pokazala slične promene. Efekti su generalno bili naklonjeni GAA po pitanju snage, mišićnih indeksa i hidratacionih parametara, iako sa širokim intervalima.

Miostatin – oba suplementa su smanjila cirkulacioni miostatin – protein koji ograničava mišićni rast – pri čemu je GAA izazvao veće potiskivanje. Da li ovaj pad u krvi zaista dovodi do značajnih mišićnih promena kod starijih osoba još uvek nije dokazano.

Ostali markeri – kreatin je izazvao blagi pad serumskog albumina, ali je ostao u okviru normalnih referentnih vrednosti. Serumski IGF‑1 bio je ispod granice detekcije kod većine učesnika, pa nije bilo moguće proceniti GH‑IGF‑1 osovinu.

Oprez – šta ne treba zanemariti

  • Veličina pilota. Sa po 10‑11 učesnika po grupi, studija nema snagu da donese čvrste zaključke. Autori sami nazivaju nalaze preliminarnim i hipotezama‑generišućim.
  • BIA nije skeniranje. Bioelektrična impedansa procenjuje mišiće na osnovu električnih svojstava i veoma je osetljiva na hidrataciju. Kreatin je poznat po pomeranju vode u mišiće, a i grupa GAA je pokazala povećanje ukupne telesne vode. Stoga „dobici“ u mišićnoj masi mogu delimično odražavati promene u tečnosti. DXA ili MRI bi bili čvršći test.
  • Nema vežbanja. Studija ispituje šta suplementi čine sami po sebi. Većina realnih koristi kreatina kod starijih dolazi uz otporni trening, pa ovi rezultati ne moraju važiti za one koji vežbaju.
  • Pitanje homocisteina. Pošto sinteza kreatina iz GAA troši metil‑grupe, GAA je u drugim studijama podigao homocistein. Povišeni homocistein je faktor rizika za kardiovaskularne i kognitivne probleme. Ovaj pilot je merio totalni homocistein, ali u apstraktu nema istaknutog rezultata, pa je potrebno pogledati kompletan rad pre donošenja zaključaka. U praksi istraživači koji rade sa GAA često preporučuju adekvatan unos folata, B6, B12 i drugih metil‑donora poput betaina, posebno kod starijih koji su skloni deficitima vitamina B12.
  • Kratko trajanje i široki intervali. Osam nedelja ne govori ništa o dugoročnoj bezbednosti ili trajnosti efekata.

Praktični zaključci

  • Ispitivana doza bila je 2 g/dan GAA, naspram ekvimolarne doze kreatin monohidrata (otprilike 2,5 g).
  • Ko bi eventualno mogao razmotriti GAA: starije osobe koje ne reaguju na kreatin ili koje ne vežbaju. To je još uvek spekulacija i tema za razgovor sa lekarom, naročito kod osoba sa kardiovaskularnim rizicima, problemima sa bubrezima ili niskim statusom B‑vitamina.
  • Zašto kreatin monohidrat ostaje default: ima decenije podataka o sigurnosti i efikasnosti u različitim populacijama, je jeftin i njegove koristi su najjasnije dokumentovane uz otporni trening. Evidencija za GAA je još uvek oskudna, a postoji potencijalni rizik od povišenog homocisteina.
  • Šta bi promenilo sliku: veće, adekvatno napojene studije kod osoba sa sarkopenijom, korišćenjem DXA ili MRI, praćenjem homocisteina i statusa B‑vitamina, i uključivanjem grupa sa vežbanjem.

Konačni zaključak

Ovaj pilot daje GAA pravi, iako preliminarni, naslov: bolja snaga hvatanja od kreatina kod starijih odraslih osoba tokom 8 nedelja bez vežbanja. Ali interval povjerenja koji dotiče nulu, 21 završni učesnik i BIA‑bazirane procene mišića čine ovo signal koji vredi pratiti, a ne konačnu presudu. Za sada, kreatin monohidrat uz otporni trening i dalje ostaje dokazani pristup, dok je GAA nešto što treba imati na oku.

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

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