Caffeine might not enhance performance for everyone!

The CYP1A2 gene is integral for metabolising substances like caffeine, with variants of the gene categorising individuals as fast (AA), intermediate (AC), or slow (CC) metabolisers. These genotypes influence how substances are processed in the body, affecting their efficacy and duration of action.

A recent meta-analysis delved into how these CYP1A2 genotypes interact with caffeine to affect exercise performance. The study revealed that the different genotypes respond uniquely to caffeine intake:

• AA genotype (Fast Metabolizers): Experienced a small performance-enhancing effect.
• AC genotype (Intermediate Metabolizers): Experienced a very small performance-enhancing effect.
• CC genotype (Slow Metabolizers): Experienced a small performance-decreasing effect, nuanced by timing and dosage.

Contrary to the general guidelines recommending 3-6 mg/kg body mass of caffeine around 60 minutes before exercise, the study suggests that a one-size-fits-all approach may not be best. Specifically for slow metabolizers (CC), consuming caffeine 100 to 120 minutes before exercise and at higher doses close to 6 mg/kg body mass may be more beneficial.

These findings signal the potential for personalized caffeine guidelines based on CYP1A2 genotypes, although routine genetic testing for this purpose is not yet universally recommended. Nevertheless, for athletes or individuals seeking to optimize caffeine for performance, understanding one's CYP1A2 genotype could provide a useful framework for experimentation.

For deeper understanding, read the full study here: https://journals.lww.com/acsm-msse/ab...

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