Det er mange feiloppfatninger når det kommer til kaffe og koffein. Mange tror det er en «farlig» drikke, det er dehydrerende, og rett og slett noe man helst ikke burde innta. Dette stemmer ikke!
Den respekterte journalen til «International society of sports nutrition» publiserte i 2010 en såkalt «position stand» som oppsummerer forskningen på koffein og ytelse, og konklusjonen er som følgende:
• Caffeine is more powerful when consumed in an anhydrous state (capsule/tablet, powder), as compared to coffee.
• The majority of research has utilized a protocol where caffeine is ingested 60 min prior to performance to ensure optimal absorption; however, it has also been shown that caffeine can enhance performance when consumed 15-30 min prior to exercise.
• Caffeine is effective for enhancing various types of performance when consumed in low-to-moderate doses (~3-6 mg/kg); moreover, there is no further benefit when consumed at higher dosages (≥ 9 mg/kg).
• During periods of sleep deprivation, caffeine can act to enhance alertness and vigilance, which has been shown to be an effective aid for special operations military personnel, as well as athletes during times of exhaustive exercise that requires sustained focus.
• Caffeine is an effective ergogenic aid for sustained maximal endurance activity, and has also been shown to be very effective for enhancing time trial performance.
• Recently, it has been demonstrated that caffeine can enhance, not inhibit, glycogen resynthesis during the recovery phase of exercise.
• Caffeine is beneficial for high-intensity exercise of prolonged duration (including team sports such as soccer, field hockey, rowing, etc.), but the enhancement in performance is specific to conditioned athletes.
• The literature is inconsistent when applied to strength and power activities or sports. It is not clear whether the discrepancies in results are due to differences in training protocols, training or fitness level of the subjects, etc. Nonetheless, more studies are needed to establish the effects of caffeine vis a vis strength-power sports.
• Research pertaining exclusively to women is limited; however, recent studies have shown a benefit for conditioned strength-power female athletes and a moderate increase in performance for recreationally active women.
• The scientific literature does not support caffeine-induced dieresis during exercise. In fact, several studies have failed to show any change in sweat rate, total water loss, or negative change in fluid balance that would adversely affect performance, even under conditions of heat stress.
PRAKTISKE TIPS: Om du liker kaffe eller andre koffeinkilder før trening, så kan du nyte dette med god samvittighet. En dose på 200-500 mg 30-60 min før trening ser ut til å være mest effektivt.
* Kilde: Erica R Goldstein et al. International society of sports nutrition position stand: caffeine and performance. J Int Soc Sports Nutr. 2010; 7: 5. Published online 2010 Jan 27. doi: 10.1186/1550-2783-7-5. -> http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2824625