eddylee
Oral Creatine Supplementation Decreases Blood Lactate during Exhaustive, Incremental Cycling. 1/15/2013 7:26PM Reply | Return to Index | Report Post
http://www.ncbi.nlm.nih.gov/pubmed/23164647
Abstract:
Oral Creatine Supplementation Decreases Blood Lactate during Exhaustive, Incremental Cycling.
Oliver JM, Joubert DP, Martin SE, Crouse SF.
SourceApplied Exercise Science Laboratory, Texas A&M University, College Station, TX and the Neuromuscular Research Laboratory, University of Pittsburgh, Pittsburgh, PA.

Abstract
PURPOSE: The purpose of this study was to determine the effects of creatine supplementation on blood lactate during incremental cycling exercise.

METHODS: Thirteen male subjects (mean ± SD: 23 ± 2 years; 178.0 ± 8.1 cm; 86.3 ± 16.0 kg; 24 ± 9 % body fat) performed a maximal, incremental cycling test to exhaustion before (Pre) and after (Post) 6-days of creatine supplementation (4-doses per day of 5 g creatine + 15 g glucose). Blood lactate was measured at the end of each exercise stage during the protocol, and the lactate threshold was determined as the stage prior to achieving 4 mmol·L-1. Lactate concentrations during the incremental test were analyzed using a 2 (condition) x 6 (exercise stage) repeated measures ANOVA. Differences in power at lactate threshold, power at exhaustion, and total exercise time were determined by paired t-tests and are presented as means ± SD.

RESULTS: Lactate concentrations were reduced during exercise following supplementation, demonstrating a significant condition effect (p = 0.041). There was a tendency for increased power at the lactate threshold (Pre: 128 ± 45 W; Post: 143 ± 26 W; p = 0.11). Total time to fatigue approached significant increases (Pre: 22.6 ± 3.2 min.; Post: 23.3 ± 3.3 min.; p = 0.056), as did maximal power output (Pre: 212.5 ± 32.5 W; Post: 220 ± 34.6 W; p = 0.082).

CONCLUSIONS: Our findings demonstrate creatine supplementation decreases lactate during incremental cycling exercise and tends to raise lactate threshold. Therefore, creatine supplementation could potentially benefit endurance athletes.


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Has anyone ever tired supplementing creatine into their diet prior to a mid distance race (maybe 4-5 days prior)?
luv2run
RE: Oral Creatine Supplementation Decreases Blood Lactate during Exhaustive, Incremental Cycling. 1/15/2013 9:52PM - in reply to eddylee Reply | Return to Index | Report Post
It should be noted that these subjects were not very well-trained (128W at LT is not much).

Also, lactate was decreased, but the performance measures were not statistically significant, meaning they might be due to chance. P=0.082 and p=0.11 are not impressive.

Thus, you might want to hold off.
Bad Wigins
RE: Oral Creatine Supplementation Decreases Blood Lactate during Exhaustive, Incremental Cycling. 1/16/2013 1:04AM - in reply to eddylee Reply | Return to Index | Report Post
What about the 13 subjects who got the placebo creatine?

Oh wait, there weren't any, were there.

Of course their lactate tolerance improved. They were put through an exhausting workout and then had 6 days to recover.
30g of creatine had nothing to do with it.
SCIENCE!
RE: Oral Creatine Supplementation Decreases Blood Lactate during Exhaustive, Incremental Cycling. 1/16/2013 1:38AM - in reply to eddylee Reply | Return to Index | Report Post
Depending on the form of creatine, water retention and weight gain can raise issue. I also think that standard protocol has a fairly long building phase with more supplementation in the first two weeks before tapering off, but don't quote me there. A few spoon fulls here and there seems off, for this experiment.


All that being said, I don't have a lot of personal experience with creatine because the Phosphagen system is stressed in a very limited way in middle distance running. Not really a performance limiting energy system, to my knowledge.
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24% bodyfat...might not be elite athletes....
correct
RE: Oral Creatine Supplementation Decreases Blood Lactate during Exhaustive, Incremental Cycling. 1/26/2013 8:05AM - in reply to luv2run Reply | Return to Index | Report Post

luv2run wrote:

It should be noted that these subjects were not very well-trained (128W at LT is not much).



You are absolutely correct. These numbers are bad, even without taking into account the subjects weight. When you calculate w/kg it is even worse. The watts per kilo at both the lowest weight number and the highest rate them in the severely un-trained category of fitness.
Mr E-man
RE: Oral Creatine Supplementation Decreases Blood Lactate during Exhaustive, Incremental Cycling. 1/26/2013 8:58AM - in reply to Bad Wigins Reply | Return to Index | Report Post

Bad Wigins wrote:

What about the 13 subjects who got the placebo creatine?

Oh wait, there weren't any, were there.

Of course their lactate tolerance improved. They were put through an exhausting workout and then had 6 days to recover.
30g of creatine had nothing to do with it.

How do these people get paid to do research? It is obvious that they didn't control for that variable.