30 september 2012 kl 18:09
Redigerad 30 september 2012 kl 18:09
Jo förvisso men det finns en del mer.
Recent research has shown that chronic dietary beta-alanine (betaALA) supplementation increases muscle carnosine content, which is associated with better performance in short (1-2 min) maximal exercise. Success in endurance competitions often depends on a final sprint. However, whether betaALA can be ergogenic in sprint performance at the end of an endurance competition is at present unknown. Therefore, we investigated the effect of 8-wk betaALA administration in moderately to well-trained cyclists on sprint performance at the end of a simulated endurance cycling race.
A double-blind study was performed, which consisted of two experimental test sessions interspersed by an 8-wk betaALA (2-4 g.d; n = 9) or matched placebo (PL; n = 8) supplementation period. In the pretesting and the posttesting, subjects performed a 10-min time trial and a 30-s isokinetic sprint (100 rpm) after a 110-min simulated cycling race. Capillary blood samples were collected for determination of blood lactate concentration and pH.
Mean power output during the time trial was approximately 300 W and was similar between PL and betaALA during either the pretesting or the posttesting. However, compared with PL, during the final sprint after the time trial, betaALA on average increased peak power output by 11.4% (95% confidence interval = +7.8 to +14.9%, P = 0.0001), whereas mean power output increased by 5.0% (95% confidence interval = +2.0 to +8.1%, P = 0.005). Blood lactate and pH values were similar between groups at any time.
Oral betaALA supplementation can significantly enhance sprint performance at the end of an exhaustive endurance exercise bout.
Med Sci Sports Exerc. 2009 Mar 7. beta-Alanine Improves Sprint Performance in Endurance Cycling.
Effects of beta-alanine supplementation and high-intensity interval training on endurance performance and body composition in men; a double-blind trial
Abbie E Smith , Ashley A Walter , Jennifer L Graef , Kristina L Kendall , Jordan R Moon , Christopher M Lockwood , David H Fakuda , Travis W Beck , Joel T Cramer and Jeffrey R Stout
Journal of the International Society of Sports Nutrition 2009, 6:5
Published: 11 February 2009
Citat:
Intermittent bouts of high-intensity exercise result in diminished stores of energy substrates, followed by an accumulation of metabolites, promoting chronic physiological adaptations. In addition, beta-alanine has been accepted has an effective physiological hydrogen ion (H+) buffer. Concurrent high-intensity interval training (HIIT) and beta-alanine supplementation may result in greater adaptations than HIIT alone. The purpose of the current study was to evaluate the effects of combining beta-alanine supplementation with high-intensity interval training (HIIT) on endurance performance and aerobic metabolism in recreationally active college-aged men. Methods. Forty-six men (Age: 22.2 +/- 2.7 yrs; Ht: 178.1 +/- 7.4 cm; Wt: 78.7 +/- 11.9; VO2peak: 3.3 +/- 0.59 l * min-1) were assessed for peak O2 utilization (VO2peak), time to fatigue (VO2TTE), ventilatory threshold (VT), and total work done at 110% of pre-training VO2peak (TWD). In a double-blind fashion, all subjects were randomly assigned into one either a placebo (PL - 16.5g dextrose powder per packet; n=18) or beta-alanine (BA - 1.5 g beta-alanine plus 15 g dextrose powder per packet; n=18) group. All subjects supplemented four times per day (total of 6g/day) for the first 21-days, followed by two times per day (3g/day) for the subsequent 21 days, and engaged in a total of six weeks of HIIT training consisting of 5-6 bouts of a 2:1 minute cycling work to rest ratio. Results. Significant improvements in VO2peak, VO2TTE, and TWD after three weeks of training were displayed (p<0.05). Increases in VO2peak, VO2TTE, TWD and lean body mass were only significant for the BA group after the second three weeks of training. Conclusions. The use of HIIT to induce significant aerobic improvements is effective and efficient. Chronic BA supplementation may further enhance HIIT, improving endurance performance and lean body mass.
fulltext,
http://www.jissn.com/content/6/1/5Det, för mig, pekar åt att det kan vara till en fördel även om man får ta en del studier med en nypa salt!
Sen jag tycker det är kul med kosttillskott och har en del kvar sen jag tävlade i BF och SL så testar med set som är relevant.
