Creatine werkt niet tijdens de laadfase

[3XL]

Medicine & Science in Sports & Exercise:Volume 36(5) SupplementMay 2004p S334

Power Output Response during Loading Creatine Supplementation Period[Annual Meeting Abstracts: H-19 - Free Communication/Poster: Creatine]
Laks, Daniel M.; Duarte, Julia S.; Alves, Letícia A.; Neves, Carlos E.B; Santos, Edil L.

Graduate School of Physical Education, Exercise Physiology Laboratory, Estácio de Sá University, Campus Rebouças., Rio de Janeiro, Brazil.

Email: byels@uol.com.br

2299

Response to Creatine supplementation (CS) has been frequently focused on physical performance, maximal strength and power output (PO). However, few works investigated PO response during loading CS period (LCSP).

PURPOSE: To evaluate the peak (PPO), mean (MPO), variation (ΔPO) of PO and total work done (TW) during LCSP.

Methods: Ten male subjects (22.8 * 2.94 yrs; 75.3 * 7.9 kg; 12.57 * 5.16 % of fat), were divided in two groups - Creatine (CR) and placebo (Pl), taking 4 × 5g.d-1 of CR or maltodextrine, respectively.

After a familiarization test, all subjects accomplished 4 modified 60-s Wingate test (W1, W2, W3, W4). Experimental design was double blind placebo-controlled during 7-d, with 48h rest. The PPO, MPO, ΔPO (computed as the ratio between PO30s/PPO, PO60s/PPO, and PO60s/PO30s), and TW achieved in each test were compared through analysis of variance (ANOVA) two-way for each group (α=.05). Additionally, the PO response during LCSP was modeled by linear regression (least square method).

Results: The PPO attained within W1 and W4 showed a progressive but non-significant decrease - 75.6 * 12.9kpm.s-1, 71.8 * 17.4kpm.s-1 (CR) and 89.2 * 23.3 kpm.s-1 and 73.2 * 14.8 kpm.s-1 (Pl). The MPO presented similar results concerning W1 and W4 50.3 * 7.1kpm.s-1; 48.5 * 7.4 kpm.s-1, (CR); and 56 * 7.5kpm.s-1; 46.4 * 5.3kpm.s-1, (Pl) as well as TW 3018.8 * 426.3kpm.s-1; 2912.8 * 441.8kpm.s-1 (CR) and 3362.8 * 450.3 kpm.s-1; 2783.1 * 319.8 kpm.s-1. (Pl).

After modeling PO during LCSP, the angular coefficient fitted for CR was lower than for Pl (p<0.05), as expressed by the following equations: PPO = -2.1671.x + 78.892 (CR) and PPO = -5.5158.x + 94.166 (Pl), which could indicate a lower decrease rate in CR, compared to Pl.

Conclusion: Although no differences were obtained when comparing CR to Pl, in opposite to CR, Pl presented a significant decrease during LCSP. In summary, even though PO parameters have not shown an increase during LCSP, the PPO attained by CR presented a lower decrease, when compared to Pl.
Medicine & Science in Sports & Exercise - Fulltext: Volume 36(5) May 2004 p S334 Power Output Response during Loading Creatine Supplementation Period.




Uitleg door Coachsci

CREATINE DOES NOT ACT DURING THE CREATINE LOADING PERIOD

Laks, D. M., Duarte, J. S., Alves, L. A., Neves, C. E., & Santos, E. L. (2004). Power output response during loading creatine supplementation period. Medicine and Science in Sports and Exercise, 36(5), Supplement abstract 2299.



This study investigated the power output during a creatine supplement loading period. It evaluated the peak power output, mean power output, power output variation, and total work done during the loading period. Males (N = 10) were divided in two groups - creatine and placebo, taking 4 × 5gm/day of creatine or maltodextrine, respectively. After a familiarization test, Ss completed a modified 60-s Wingate test on four alternate days. Testing was over seven days with 48 hours of rest between each test.

Peak power output, mean power output, and total work performed showed a non-significant decrease over the seven days. The amount of decrease was slightly less in the creatine group than in the placebo group.

Implication. Power output does not increase during a creatine supplement loading period.
Fuel and Ergogenic Aids 4.1 - Creatine