Kreatin øger udholdenhed

[allerup]

Ifølge denne her undersøgelse skulle kreatin have en effekt på udholdenheden, eller lactattærsklen ved udholdenhedstræning. I forsøget er godt nok kun udført tests op til tre minutter, kan man derfor sige at udholdenheden også vil være bedre efter en time?

Eller underbygger den bare allerede det man allerede ved, nemlig at kreatin har en positiv indflydelse på kortvarige præstationer... Det er vel et spørgsmål om tre minutter er særligt lang tid i den forbindelse?

Effect of creatine supplementation on aerobic performance and anaerobic capacity in elite rowers in the course of endurance training.

[ziggymund]

Ifølge denne her undersøgelse skulle kreatin have en effekt på udholdenheden, eller lactattærsklen ved udholdenhedstræning. I forsøget er godt nok kun udført tests op til tre minutter, kan man derfor sige at udholdenheden også vil være bedre efter en time?

Eller underbygger den bare allerede det man allerede ved, nemlig at kreatin har en positiv indflydelse på kortvarige præstationer... Det er vel et spørgsmål om tre minutter er særligt lang tid i den forbindelse?

Effect of creatine supplementation on aerobic performance and anaerobic capacity in elite rowers in the course of endurance training.

LT er jo røget opad, så på den måde er udholdenheden forbedret. Men nu er udholdenhed jo andet end blot LT niveauet.

Det er ny viden for mig, og jeg synes det rummer visse perspektiver. Også ift. dopingproblematik.

Ziggymund :bike:

[allerup]

:)

Edited November 28, 2003 by allerup

[linder]

Det er ny viden for mig, og jeg synes det rummer visse perspektiver. Også ift. dopingproblematik.

Hov hov kreatin er ikke på doping listen - men nu omkring doping ploblematikken er det herligt at Anti Doping Danmark er gået ind i kampen mod pillerne og sprøjten....

[TCO]

Så vidt jeg ved har det også været overvejet flere gange til at komme på dopinglisten, men man har valgt ikke at smide det på da det findes i helt normal mad.

[Fast legs]

"LT er jo røget opad, så på den måde er udholdenheden forbedret."

Helt sikker! - lyder spændende!

Men nu er udholdenhed jo andet end blot LT niveauet.

"Ja, men de er alligevel tæt knyttet til hinanden"

Godt fundet ALLERUP - jeg er allerede i gang med at læse!

[allerup]

Kan man læse hele artiklen på pubmed, som jeg ser det kan jeg kun finde det der uddrag?

[Tr0lle]

allerup:

Nej, det kan du ikke. Pubmed ligger kun inde "abstracts". Den fulde artikel findes i "International journal of sport nutrition and exercise metabolism".

[MadsSWIM]

Bestemt interessant - især når man arbejder med konkurrencetider primært på 50-140 sek

Mads :swim:

[Hessel]

Effect of creatine supplementation on body composition and performance: a meta-analysis.

Branch JD.

Department of Exercise Science, Physical Education, and Recreation at Old Dominion University, Norfolk, VA 23529-0196, USA.

BACKGROUND: Creatine supplementation (CS) has been reported to increase body mass and improve performance in high-intensity, short-duration exercise tasks. Research on CS, most of which has come into existence since 1994, has been the focus of several qualitative reviews, but only one meta-analysis, which was conducted with a limited number of studies. PURPOSE: This study compared the effects of CS on effect size (ES) for body composition (BC) variables (mass and lean body mass), duration and intensity (< or = 30 s, [ATP-PCr = A]; 30-150 s [glycolysis = G]; >150 s, [oxidative phosphorylation = O]) of the exercise task, type of exercise task (single, repetitive, laboratory, field, upper-body, lower-body), CS duration (loading, maintenance), and subject characteristics (gender, training status). METHODS: A search of MEDLINE and SPORTDiscus using the phrase "creatine supplementation" revealed 96 English-language, peer-reviewed papers (100 studies), which included randomized group formation, a placebo control, and human subjects who were blinded to treatments. ES was calculated for each body composition and performance variable. RESULTS: Small, but significant (ES > 0, p < or = .05) ES were reported for BC (n=163, mean +/- SE=0.17 +/- 0.03), ATP-PCr (n=17, 0.24 +/- 0.02), G (n=135, 0.19 +/- 0.05), and O (n=69, 0.20 +/- 0.07). ES was greater for change in BC following a loading-only CS regimen (0.26 +/- 0.03, p=.0003) compared to a maintenance regimen (0.04 +/- 0.05), for repetitive-bout (0.25 +/- 0.03,p=.028) compared to single-bout (0.18 +/- 0.02) exercise, and for upper-body exercise (0.42 +/- 0.07, p<.0001) compared to lower (0.21 +/- 0.02) and total body (0.13 +/- 0.04) exercise. ES for laboratory-based tasks (e.g., isometric/isotonic/isokinetic exercise, 0.25 +/- 0.02) were greater (p=.014) than those observed for field-based tasks (e.g., running, swimming, 0.14 +/- 0.04). There were no differences in BC or performance ES between males and females or between trained and untrained subjects. CONCLUSION: ES was greater for changes in lean body mass following short-term CS, repetitive-bout laboratory-based exercise tasks < or = 30 s (e.g., isometric, isokinetic, and isotonic resistance exercise), and upper-body exercise. CS does not appear to be effective in improving running and swimming performance. There is no evidence in the literature of an effect of gender or training status on ES following CS.