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Position stand regarding caffeine intake by the International Society of Sports Nutrition

Following critical evaluation of the available literature to date, the International Society of Sports Nutrition ISSN has updated its position stand regarding caffeine intake in January 2021. The outcome in bullets below:

• Caffeine intake has been shown to enhance various aspects of exercise performance: muscular endurance, movement velocity and muscular strength, sprinting, jumping, and throwing performance, as well as a wide range of aerobic and anaerobic sport-specific actions.

• Aerobic endurance appears to be the form of exercise with the most consistent benefits from caffeine use, although the magnitude of its effects differs between individuals.

• Caffeine has also been shown to be ergogenic for cognitive function, including attention and vigilance, in most individuals.

• Furthermore, caffeine may improve cognitive and physical performance in some individuals under conditions of sleep deprivation.

• Caffeine appears to improve physical performance in both trained and untrained individuals.

• Caffeine has consistently been shown to improve exercise performance when consumed in doses of 3–6 mg/kg body mass. Minimal effective doses of caffeine currently remain unclear, but they may be as low as 2 mg/kg body mass. Very high doses of caffeine (≥ 9 mg/kg) are associated with a high incidence of side-effects and with no additional ergogenic effect.

• The most commonly used timing of caffeine supplementation is 60 min pre-exercise. Optimal timing of caffeine ingestion depends also on the source of caffeine (coffee, capsules, gels, etc.).

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Guest, Nanci S, et al. (2021): International society of sports nutrition position stand: caffeine and exercise performance. J Int Soc Sports Nutr 18, 1 (2021).

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