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(Aaron_F @ Oct. 14 2006,22:21)</div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE"> <div></div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">ITs the pre workout meal that is important in ueling the body and promoting repair.</div>
Provide us evidence that a fast acting protein provides greater evidence than slow protein.
in terms of pre vs post
Stimulation of Net Muscle Protein Synthesis by Whey Protein Ingestion Before and After Exercise.
* Tipton KD,
* Elliott TA,
* Cree MG,
* Aarsland AA,
* Sanford AP,
* Wolfe RR.
School of Sport and Exercise Sciences, University of Birmingham, Birmingham, United Kingdom.
Timing of nutrient ingestion has been demonstrated to influence the anabolic response of muscle following exercise. Previously, we demonstrated that net amino acid uptake was greater when free essential amino acids plus carbohydrates were ingested prior to resistance exercise rather than following exercise. However, it is unclear if ingestion of whole proteins prior to exercise would stimulate a superior response compared to following exercise. This study was designed to examine the response of muscle protein balance to ingestion of whey proteins both prior to and following resistance exercise. Healthy volunteers were randomly assigned to one of two groups. A solution of whey proteins was consumed either immediately prior to exercise (PRE; n=8) or immediately following exercise (POST; n=9). Each subject performed 10 sets of 8 repetitions of leg extension exercise. Phenylalanine concentrations were measured in femoral arteriovenous samples to determine balance across the leg. Arterial amino acid concentrations were elevated by ~50% and net amino acid balance switched from negative to positive following ingestion of proteins at either time. Amino acid uptake was not significantly different between PRE and POST when calculated from the beginning of exercise (67+/-22 and 27+/-10 for PRE and POST, respectively) or from the ingestion of each drink (60+/-17 and 63+/-15 for PRE and POST, respectively). Thus, the response of net muscle protein balance to timing of intact protein ingestion does not respond as does that of the combination of free amino acids and carbohydrate.</div>
I wont be proviing evidence since i said there would not be a noticable difference between them I believe you misread me.
Tipton seems to be quite contradicting then.
While immediate consumption of amino acids combined with a carbohydrate source post exercise has been indicated to enhance protein accretion, it is important to understand the effect of a pre workout feeding on this parameter. Once again Tipton and colleagues (2001) from the University of Texas medical branch were up to the
They had six participants consume a liquid meal of 6 grams of essential amino acids combined with 35 grams of sucrose (EACsolution) prior to exercise (PRE), or immediately after exercise (POST). Protein kinetics were measured at rest, during exercise and up to two hours post exercise. Results indicated that the PRE condition increased blood flow by 324 % to the leg compared to a 201 % increase in the post condition, and this corresponded with a650 % increase in phenylalanine delivery to the muscle compared to a 250 % increase in the POST condition. Further phenylalanine uptake across the leg was 160 % greater in the PRE condition than the POST condition. Perhaps of most interestwas the finding that protein balance went from negative at rest to positive during exercise and post exercise for the PRE condition, while the post condition remained negative during both rest and exercise, and turned positive after exercise. It is important to note that over the 3 hour measure that both the PRE and POST wereeffective in turning the overall muscle balance from negative to positive. However this response was greater in the PRE than POST. Before analyzing the mechanisms of these results it is important to recognize thatthe results favor the PRE condition, as each of the three hours following EAC consumption in the PRE trial were measured, where as the POST condition onlymeasured two hours following EAC consumption. Therefore the authors make further calculations of only the final two hours of collection. However, even whenmeasured this way their was an 80 % greater amino acid uptake for the PRE thanPOST conditions. However, these results did not reach significance. The timing element is critical in this study as blood flow is greatly increased by muscular contraction. This effect appeared to be heightened with ingestion of a pre workout amino acid solution. Further, the combined effects of increased blood flow and elevated amino acid concentrations elicited a potent anabolic stimulus. Typicallynet protein balance during exercise is negative, and while protein synthesis isstimulated following training, it either remains unchanged or is decreased during exercise (Tipton et al., 2001). However, protein degradation is markedly increased during exercise and results in a net negative protein balance (Tipton et al., 2001). As predicted by Tipton et al. (2001) the pre workout nutrition appeared to counter these effectsSummarizing the dataWhile protein synthesis is elevated up to 48 hours following an exercise session, protein degradation is also increased; resulting in a negative protein balance ifadditional nutrients are not supplied (Phillips et al., 2005). In this context post workout amino acid feedings are critical to muscle protein accretion. Evidence from Rasmussen et al. (2000) suggests that there is no difference between amino acid consumption one and three hours after training. However long term results from Esmarck et al. (2001) and acute evidence from Levenhagen et al. (2001) suggest that immediate post exercise amino acid feedings provide a more favorable anabolic response than feedings 2-3 hours post exercise. Preworkout nutrition has also been indicated to be a critical component of stimulating muscular hypertrophy. Tipton et al. (2001) demonstrated that pre workout nutrition reversed the typically negative protein balance seen in exercise to a positive protein balance.