Creatine Supplementation

Cycling tests were carried out at intensities equal

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Unformatted text preview: tests were carried out at intensities equal to 30% and 90% of peak power until exhaustion. After a standardised warm up, subjects cycled for a total of five, 3-minute stages (alternating 30% and 90% of maximal power output). Blood samples were taken at four separate timepoints (rest, just before the end of each cycling load, at exhaustion, and at 5 minutes post-exercise). 2005 Adis Data Information BV. All rights reserved. Bemben & Lamont ˙ There was a greater VO2 for the Cr group and lower blood ammonia concentrations. Plasma uric acid was also found to be lower for the Cr group at the cessation of exercise and 5 minutes post-exercise. From a performance standpoint, the Cr group increased their time to exhaustion from 29.9 ± 3.8 minutes to 36.5 ± 5.7 minutes, while there were no changes seen with the placebo group. It appeared that Cr supplementation during the current study was able to increase the total amount of work that could be performed during alternating bouts of different intensity exercise by effecting oxygen utilisation and enhancing oxidative phosphorylation at these varying intensities.[54] 2.4 Intermittent Endurance The role Cr might have in improving bouts of intermittent anaerobic exercise has been addressed in a number of studies since 2000, with conflicting results. Yquel et al.[15] described the effects of Cr supplementation on PCr resynthesis and inorganic phosphate accumulation during intermittent exercise. Nine male subjects consumed 20 g/day Cr for 6 days in a non-blinded fashion. Using an isokinetic dynamometer, subjects performed five, 8-second bouts of dynamic plantar flexion exercise with 30 seconds of recovery between bouts. An additional two bouts (bouts six and seven) were then carried out for a total of 8 and 16 seconds, respectively. The rest interval between the end of bout five and the start of bout six was 1 minute with 2 minutes allowed between bouts six and seven. Muscle PCr and inorganic phosphate were estimated every 16 seconds using 31P magnetic resonance spectroscopy. R...
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This note was uploaded on 01/28/2014 for the course BI 231 taught by Professor Richardmay during the Fall '13 term at Southern Oregon.

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