NUTRITION – CREATINE – CAFFEINE


1 RESEARCH ARTICLE


CAFFEINE COUNTERACTS THE ERGOGENIC ACTION OF MUSCLE CREATINE LOADING – 1996


K. Vandenberghe , N. Gillis , M. Van Leemputte , P. Van Hecke , F. Vanstapel , P. Hespel
AIM:
– Compare effects of creatine (Cr) with creatine in combination with caffeine (Cr+C) on muscle phosphocreatine (PCr) level and performance in males (n = 9)
METHOD:
(1) Before and after 6 days of placebo, Cr (0.5 g x kg x day), or Cr (0.5 g x kg x day) + C (5 mg x kg x day-1) supplementation
Note: For a 80kg/176 lb person this is large dosages = 40 grams Cr and 400 mg Caffeine per day
(2) 3 consecutive maximal isometric contractions and 3 interval series of 90, 80, and 50 maximal voluntary contractions performed with rest interval of 2 min between series
RESULTS:
(1) Muscle ATP concentration remained constant over the 3 experimental conditions
(2) Cr and Cr+C increased muscle PCr concentration by 4-6%
(3) Dynamic torque production, however, was increased by 10-23% by Cr but was not changed by Cr+C
(4) Torque improvement during Cr was most prominent immediately after the 2-min rest between the exercise bouts
CONCLUSIONS:
(1) Cr supplementation elevates muscle PCr concentration and markedly improves performance during intense intermittent exercise
(2) This ergogenic effect, however, is completely eliminated by caffeine intake


 

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