Thread: Creatine timing
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Old 01-22-2010, 09:12 AM   #6
Mike ODonnell
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Originally Posted by Mike ODonnell View Post
I would say more ideal is pre-workout (and/or during) mixed with BCAAs.
I retract my original assumption and stand corrected....pre may not be as ideal as I initially believed as I was just lumping it in with the pre-wo bcaa advantage.

Quote:
J Sports Med Phys Fitness. 2002 Sep;42(3):320-9.
Pre-exercise oral creatine ingestion does not improve prolonged intermittent sprint exercise in humans.

Preen D, Dawson B, Goodman C, Lawrence S, Beilby J, Ching S.

Department of Human Movement and Exercise Science, The University of Western Australia, Crawley, WA, Australia. dpreen@mbox.com.au

BACKGROUND: This investigation determined whether pre-exercise oral Cr ingestion could enhance prolonged intermittent sprint exercise performance. METHODS: EXPERIMENTAL DESIGN: a randomised, double-blind crossover design was employed. SETTING: testing was performed at the Western Australian Institute of Sport and participants were monitored and treated by both scientific and medical personnel. PARTICIPANTS: eight active, but not well-trained males with a background in multiple-sprint based sports acted as subjects for this investigation. INTERVENTIONS: subjects ingested either 15 g Cr.H2O or placebo 120 min and 60 min prior to the start of an 80-min maximal sprint cycling task (10 sets of multiple 6-sec sprints with varying active recoveries). Subjects were retested 14 days later, being required to ingest the alternate supplement and repeat the exercise test. MEASURES: performance variables (work done and peak power) were obtained throughout the exercise challenge. Muscle biopsies (vastus lateralis) were raised to a peak of 2348+/-223 micromol x l(-1) prior to the commencement of exercise after Cr ingestion. There were no significant changes in any cycling performance parameters following Cr ingestion, although blood La- was significantly lower (p<0.05) than placebo at all time points during were taken preexercise as well as immediately and 3 min post-exercise in order to determine concentrations of ATP, PCr, Cr, La- and glycogen. Venous blood was drawn prior to and on four occasions during the exercise test, and analysed for Cr, NH3+, La- and pH. RESULTS: Serum Cr concentrations exercise, and plasma NH3+ accumulation was also significantly reduced (p<0.05) in the Cr condition, but only in the second half of the 80-min exercise test. Muscle ATP and TCr levels as well as postexercise PCr replenishment were unaffected following Cr administration. CONCLUSIONS: The data suggest that although the pre-exercise ingestion of a large Cr dose was shown to have some impact on blood borne metabolites, it does not improve maximal prolonged intermittent sprint exercise performance, possibly due to an insufficient time allowed for uptake of serum Cr by skeletal muscle to occur. Therefore, this form of loading does not provide an alternative method of Cr supplementation to the traditional five-day supplementation regimes established by previous research.
and for fun, the BCAA study
Quote:
Timing of amino acid-carbohydrate ingestion alters anabolic response of muscle to resistance exercise
Kevin D. Tipton1,2, Blake B. Rasmussen1,2, Sharon L. Miller1,2, Steven E. Wolf1, Sharla K. Owens-Stovall1, Bart E. Petrini1, and Robert R. Wolfe1,2

1 Department of Surgery, University of Texas Medical Branch, and 2 Metabolism Unit, Shriners Hospitals for Children, Galveston, Texas 77550

The present study was designed to determine whether consumption of an oral essential amino acid-carbohydrate supplement (EAC) before exercise results in a greater anabolic response than supplementation after resistance exercise. Six healthy human subjects participated in two trials in random order, PRE (EAC consumed immediately before exercise), and POST (EAC consumed immediately after exercise). A primed, continuous infusion of L-[ring-2H5]phenylalanine, femoral arteriovenous catheterization, and muscle biopsies from the vastus lateralis were used to determine phenylalanine concentrations, enrichments, and net uptake across the leg. Blood and muscle phenylalanine concentrations were increased by ~130% after drink consumption in both trials. Amino acid delivery to the leg was increased during exercise and remained elevated for the 2 h after exercise in both trials. Delivery of amino acids (amino acid concentration times blood flow) was significantly greater in PRE than in POST during the exercise bout and in the 1st h after exercise (P < 0.05). Total net phenylalanine uptake across the leg was greater (P = 0.0002) during PRE (209 42 mg) than during POST (81 19). Phenylalanine disappearance rate, an indicator of muscle protein synthesis from blood amino acids, increased after EAC consumption in both trials. These results indicate that the response of net muscle protein synthesis to consumption of an EAC solution immediately before resistance exercise is greater than that when the solution is consumed after exercise, primarily because of an increase in muscle protein synthesis as a result of increased delivery of amino acids to the leg.
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