Kreatinsupplementering ökar styrketräningens "repeated bout"-effekt

[King Grub]

PURPOSE:

We examined the effects of creatine supplementation on the response to repeated bouts of resistance exercise.

METHODS:

Young men (24.1 ± 5.2 yr) were divided into Creatine (CM, n = 9) and Placebo (PL, n = 9) groups. On day (D) 1 and D15, subjects performed four sets of bicep curls at 75% 1-RM to concentric failure. On D8-D13, subjects consumed either 20g/d creatine monohydrate or placebo. Muscle soreness and elbow joint range of motion (ROM) were assessed on D1-D5 and D15-D19. Serum creatine kinase activity (CK) was assessed on D1, D3, D5, D15, D17, and D19.
RESULTS:

The first exercise bout produced increases in muscle soreness and CK, and decreases in ROM in both groups (p < 0.001). The second bout produced lesser rises in serum CK, muscle soreness, and a lesser decrease in ROM (bout effect, p < 0.01 for all), with greater attenuation of these damage markers in CM than PL. CK levels on D17 were lower (+110% over D15 for CM vs. +343% for PL), muscle soreness from D15-19 was lower (-75% for CM vs. -56% for PL compared to first bout), and elbow ROM was decreased in PL, but not CM on D16 (p < 0.05 for all).

CONCLUSIONS:

Creatine supplementation provides an additive effect on blunting the rise of muscle damage markers following a repeated bout of resistance exercise. The mechanism by which creatine augments the repeated bout effect is unknown, but is likely due to a combination of creatine's multifaceted functions.

Int J Sport Nutr Exerc Metab. 2013 Jan 23. Oral Creatine Supplementation Augments the Repeated Bout Effect.

[Kischen]

repeated bout effect?

[Doolie]

Tl;dr??

[Mandelmazza]

Jag förstår inte, Grub.

[King Grub]

Repeated bout = "subsequent bouts of the same exercise, repeated within several days to several months, do not produce as much damage as the first bout" (Eur J Appl Phsiol, 85: 34-40).