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A softly lit bedside table in a calm, modern bedroom at dusk, photographed in wide landscape format with shallow depth of field. In the foreground, a matte white shaker bottle sits beside a tall frosted glass of creamy, pale vanilla-colored protein shake, with a few condensation droplets catching warm light. Next to the glass rests a slim fitness band on a dark charcoal fabric strap, its small LED glowing a gentle green, lying casually on a light oak wooden surface. A small scoop of fine white protein powder rests on a ceramic dish nearby, with a light dusting of powder on the wood. In the soft-focus background, a neatly made bed with oatmeal-colored linen bedding and a textured knit throw blanket. A sheer curtain filters the last peach and lavender light of evening from a large window. A small potted olive branch in a terracotta vase and a closed paperback book add a quiet editorial touch. A bedside lamp with a warm, cream-colored shade casts a golden glow across the scene and creates gentle highlights on the glass. The palette is muted and harmonious: warm cream, soft sand, oatmeal beige, faint sage green accents, and touches of dusty lavender in the window light. The mood is peaceful, reassuring, and clean, like a contemporary wellness magazine or a trendy health journal feature. Lighting is natural and cinematic, with soft shadows and a subtle film-like grain. The composition follows the rule of thirds, with the shake and band on the left third and open negative space on the right for headline overlay. Minimalist, Scandinavian-inspired styling, high-end lifestyle photography, crisp details, and a tranquil, premium editorial feel.
Recovery

Kazein prije spavanja ne uništava san: podaci iz WHOOP‑a

Dr. Gymbro · · 4 min read
#recovery #sleep #casein #female athletes #pre sleep nutrition #whoop #hrv

Kazein prije spavanja ne uništava san: podaci iz WHOOP‑a

Vjerojatno ste čuli upozorenje da će vas težak proteinski shake uzet neposredno prije spavanja držati budnima, vrteći se po krevetu i ostavljajući vas neodmorene. Novo randomizirano ispitivanje na elitnim sportašicama stavilo je tu tvrdnju na kušnju uz pomoć WHOOP nosivih uređaja. Rezultat je zanimljiviji od jednostavnog „da“ ili „ne“ – shake nije narušio san, ali ga nije ni poboljšao.

Mit pod lupom

Prehrana prije spavanja postala je popularna taktika oporavka. Proteini sporo probavljivi, poput kazeina, najčešći su izbor jer se smatra da opskrbljuju aminokiselinama tijekom noći. Zabrinutost je da kasni unos kalorija može poremetiti san, podići puls ili oslabiti noćni oporavak.

Istraživači s Florida State University, u suradnji s South Dakota State University, odlučili su to provjeriti. Njihov rad, objavljen u Journal of the International Society of Sports Nutrition (Paterson i sur., 2026), napominje da su randomizirani, dvostruko slijepi, krstovni pokušaji koji uspoređuju makronutrijente prije spavanja kod elitnih sportašica vrlo rijetki.

Kako je studija provedena

U studiju je regrutirano 25 sportašica NCAA Division I, u dobi od 18 do 25 godina, a 21 ih je dovršila. Svaka je sportašica prošla kroz četiri uvjeta u randomiziranom, dvostruko slijepom, placebo‑kontroliranom krstovnom dizajnu:

  • 40 g kazeina (≈ 160 kcal)
  • 40 g alfa‑laktalbumina, proteina iz sirutke (≈ 160 kcal)
  • 40 g ugljikohidrata (≈ 160 kcal)
  • 40 g placeba (≈ 5 kcal)

Svaki uvjet trajao je tri uzastopne noći, uz najmanje trodnevni wash‑out period između. Cijeli protokol traje od 4 do 8 tjedana. Suplemente su uzimale otprilike dva sata nakon zadnjeg obroka i oko 30 minuta prije spavanja – to je bio njihov posljednji kalorijski unos tog dana.

Što je mjereno

Objektivni podaci dolazili su s WHOOP 4.0 narukvice: ukupno trajanje sna, latencija za uspavljivanje, kvalitetu sna, puls u mirovanju i varijabilnost srca (HRV). Svako jutro sportašice su ispunjavale upitnike o subjektivnoj kvaliteti sna, koliko su trebale da zaspu i koliko su se osjećale oporavljenima. U malom podskupu od šest sportašica, slijepi kontinuirani monitori glukoze pratili su noćne razine glukoze.

Rezultati: u osnovi ništa novo

Nisu se pojavili značajni učinci tretmana na nijedan objektivan parametar sna ili oporavka (sva p > 0,05). Kroz četiri uvjeta zabilježeno je:

  • Ukupno trajanje sna: 7,47 – 7,62 sata
  • Kvaliteta sna: 91,5 % – 92,0 %
  • Puls u mirovanju: 53,5 – 54,1 otkucaja u minuti
  • HRV: 98,2 – 103,9 ms

Subjektivni podaci pričaju istu priču. Ocjene kvalitete sna kreću se od 69 % do 75 %, latencija od 16 do 20 minuta, a percepcija oporavka od 61 % do 66 %. Ništa od navedenog se statistički razlikovalo među tretmanima.

U podanalizi glukoze, noćna glukoza se mijenjala tijekom vremena (p = 0,008), što je očekivano. Međutim, razlika između tretmana nije bila značajna (p = 0,187) i nije bilo interakcije tretman × vrijeme (p = 0,550).

Autori su zaključili da tri noći kazeina, alfa‑laktalbumina ili ugljikohidrata prije spavanja ne narušavaju objektivan ni subjektivan san ili oporavak u usporedbi s placeboom.

Zaplet: ništa nije poboljšalo san

Ovo nije priča „proteini prije spavanja poboljšavaju san“. Nijedan od aktivnih uvjeta nije nadmašio placebo ni po jednom parametru sna. Ako želite kazein za sintezu mišićnih proteina, dosljednost ili postizanje dnevnih ciljeva unosa proteina, ova studija sugerira da ne morate brinuti o snu. Ako ste se nadali da će shake djelovati kao pomoć pri spavanju, podaci toga ne podržavaju.

Studija također nije mjerila mišićne rezultate, izvedbu ili tjelesnu kompoziciju, pa ne može reći pomaže li pre‑spava protein u smislu mišićnog oporavka.

Ograničenja koja trebate znati

  • Kratko izlaganje: Svaki uvjet trajao je samo tri noći, pa dugoročni učinci ostaju nepoznati.
  • Podaci iz nosivih uređaja: WHOOP je praktičan, ali nije policijskim standardom (polisomnografija) za mjerenje faza sna.
  • Uska populacija: Sudionici su mlade, elitne, kolegijalne sportašice koje već spavaju dobro (≈ 7,5 h s kvalitetom iznad 91 %). Rezultati možda ne vrijede za loše spavače, starije osobe, muškarce ili ne‑sportaše.
  • Mali podskup CGM‑a: Samo šest sportašica je imalo kontinuirani monitor glukoze, pa su ti nalazi preliminarni.
  • Veličina uzorka: 21 dovršila je studiju – skroman broj za otkrivanje malih učinaka.
  • Sukob interesa: Jedan od autora je neplaćeni član International Protein Board.

Praktični zaključci

Doza: Studija je koristila 40 g proteina ili ugljikohidrata (≈ 160 kcal). To je količina za koju imamo podatke u ovom kontekstu.

Vrijeme uzimanja: Sportašice su ga uzimale oko 30 minuta prije spavanja, približno dva sata nakon zadnjeg obroka, kao posljednji kalorijski unos dana.

Za koga: Sportaši i aktivni ljudi koji žele prije spavanja osigurati dodatne proteine ili energiju. U ovoj skupini mladih sportašica, dodatni unos nije štetio snu, HRV‑u niti pulsu u mirovanju.

Tko bi trebao biti oprezan:

  • Osobe s alergijom na mlijeko ili s netolerancijom na mliječne proteine, jer su oba testirana proteina mliječnog podrijetla.
  • Onima koji osobno primjećuju da im kasna konzumacija hrane narušava san – individualne reakcije mogu varirati.
  • Ljudima kojima dodatne kalorije ili proteini nisu potrebni. Budući da studija nije pokazala korist za san, nema razloga za dodatni shake samo radi boljeg sna.

Zaključak: Tvrdnja da „shake s proteinom prije spavanja ruši vaš san“ ne drži u ovom istraživanju. Posmatrajte pre‑spavaški shake kao prehrambeni alat, a ne kao trik za bolji san, i provjerite vlastite WHOOP ili druge podatke o spavanju ako želite vidjeti kako reagirate.

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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