These days, strength training and caffeine go together like The Rock and Kevin Hart. But, just like "Jumanji" doesn't do it for everybody, guzzling a pre-workout with 300 milligrams of caffeine in it might not turn you into the superhuman lifter you dream of being. In fact, depending on your genetic makeup, it might be sucking the air out of your session and leaving you whimpering in the corner.
New research from Canada took a very close look at the way the human body metabolizes caffeine.[1] Nutritionists, statisticians, and kinesiologists from the University of Toronto recruited 101 male athletes around the age of 25. The group included cyclists, marathon runners, rowers, cross-country skiers, boxers, baseball players, and powerlifters.
Using saliva samples, the researchers were able to determine the rate at which each athlete's body metabolized caffeine. Here's how: Our bodies contain a gene called CYP1A2. Changes in the DNA sequence of the gene can make CYP1A2 more or less...
Source: Caffeine: Your Best Fitness Friend Or Your Secret Enemy?
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