Snublet over dette forsøket på Pubmed i dag.
Jeg sliter litt med å trekke noe fornuftig ut av konklusjonen. Er det bra å ta proteinpulver før trening?
Det sies her at dersom man tar wheyprotein før trening vil det resultere i at man har lavere verdier av testosteron, veksthormoner og umettede fettsyrer etter en treningsøkt enn om man ikke tar protein før trening.
Det jeg da lurer på er: Vil det si at kroppen har klart å "bruke" testosteronet, veksthormoner og fettsyrene på en bedre måte under trening dersom man tar protein først? Eller får man et negativt utslag av å ta proteiner først? Er jeg helt på bærtur?
Kan noen som har litt peil på ulike prosesser i kroppen komme med et fornuftig svar?
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Protein ingestion prior to strength exercise affects blood hormones and metabolism.PURPOSE: The effects of protein consumption before strength training session on blood hormones, energy metabolites, RER, and excess postexercise oxygen consumption (EPOC) were examined. METHODS: Ten resistance-trained young men consumed either a 25 g of whey and caseinate proteins (PROT) or a noncaloric placebo (P) in a liquid form 30 min before a heavy strength training session (STS) in a crossover design separated by at least 7 d. STS lasted 50 min and included 5 x 1 RM squats, 3 x 10 RM squats and 4 x 10 RM leg presses with 2-, 3-, and 2-min recoveries, respectively. A protein-carbohydrate supplement was consumed after STS in both trials. Venous blood samples were collected before, during, and after STS and oxygen consumption before and after STS. RESULTS: Serum growth hormone (GH), testosterone, and free fatty acids (FFA) were significantly (P < or = 0.05) higher in P compared with PROT 5 min after an STS. The calculated area under curve (AUC) of the serum insulin response during an STS was significantly (P < 0.001) higher in PROT compared with P. The EPOC value from 90 to 120 min after an STS was significantly greater in the PROT condition compared with P (P = 0.01), and PROT treatment had a significantly higher RER 2 h postexercise (P = 0.04). The AUC of serum FFA during STS correlated significantly and negatively with RER 10-30 min after STS (r = -0.53, P = 0.02). CONCLUSIONS:
Consuming 25 g of whey and caseinate proteins 30 min before an STS significantly decreases serum GH, testosterone, and FFA levels, and increases serum insulin during an STS. Furthermore, the pre-STS protein increased EPOC and RER significantly during 2-h recovery after STS.http://www.ncbi.nlm.nih.gov/pubmed/16286871?itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum&ordinalpos=10