Scientists figure out how much caffeine to ingest before a workout, when exactly to ingest it, and whether habituation is a problem.
It's rare that PhD-types look at a bunch of studies and come out with some specific recommendations.
They could demonstrate how a bunch of cats – when held upside-down from a height of two feet and then dropped – landed on their feet a thousand times in a row, but they still wouldn't jump to any conclusions about how the 1001st attempt might turn out.
Hell, you could waterboard the PhD's to force a bit of kitty conjecture out of them and the best you could expect is for them to glug out a couple of terms like "sample size!" or "lack of controls!"
That's why this recent paper written by some-time T Nation contributor Dr. Brad Schoenfeld and colleagues seems a bit unusual. They conducted a review of the effects of caffeine supplementation on powerlifters and actually offered some useful, concrete recommendations on dosing, timing, and other factors that could benefit not only powerlifters, but also regular lifters and athletes of all kind.
What They Did
Caffeine is the popular drug of choice of competitive athletes – not because it's the best ergogenic drug by any measures, but at least partly because it was dropped from the World Anti-Doping Agency's list of within-competition banned substances.
Powerlifters especially love it, though. As proof of their love, caffeine levels in urine samples of powerlifters and weightlifters in general have been found to be significantly higher than those of athletes from other sports.
It's no wonder since the drug can improve maximum strength by 3-4%, which, in the powerlifting world, might mean the difference between winning your weight class and being the guy who's chosen to scrub out any suspicious stains from the other competitors' singlets.
Caffeine's status and effectiveness obviously piqued the interest of Schoenfeld and his scientist friends as they scoured through nearly every study on the subject and filtered out some amazingly specific and useful advice.
Here are some of the highlights from their paper:
- Caffeine may improve maximum strength from 3-4%. The evidence pertains specifically to the squat and bench press, but there's no reason it wouldn’t apply to the deadlift, too.
- Caffeine definitely has positive effects on strength, but may also be useful for attenuating any fatigue-induced decline in muscle strength.
- Optimal dosing is 2-6 mg/kg, although individual experimentation is needed.
- Repeated dosing may work better for competitions that are longer than 2 hours. This practice, using smaller doses of caffeine (2 mg. per kilogram) before each event, may maintain steady plasma caffeine levels.
- If using caffeine capsules, take them 60 minutes prior to event.
- If using cola or coffee, drink it 40 minutes prior to event.
- If using caffeine chewing gum, take it 10 minutes prior to an event.
Caffeine Habituation and Withdrawal
- Lifters who habitually ingest a lot of caffeine might experience less of a strength boost from pre-competition doses. As such, they might want to consider a dose of at least 3 mg per kilogram or higher before a competition.
- The ergogenic effects of caffeine seem to attenuate after 20 days of consecutive use. This suggests that powerlifters might think about ingesting caffeine only before highest intensity training sessions or competitions to maximize performance.
- A common practice among powerlifters to maximize the effects of caffeine is to stop all caffeine consumption one week prior to competition and restart on the day of the competition. Too bad the literature doesn't support it. Besides, caffeine withdrawal can lead to headache, fatigue, decreased alertness, and a depressed mood. It would work better, on competition day, to use the higher doses suggested above, in addition to limiting caffeine ingestion in general (morning coffee, coffee pick-me-ups) on the day of competition.
How to Use This Info
While Schoenfeld and the other scientists had powerlifters in mind when they compiled this info, anyone who isn't restricted by the typical PhD's unwritten code of silence would probably deduce that the findings probably hold true to lifters of all kinds.
Training legs today and hoping to set a new PR in weight or reps? Pop a few pieces of caffeinated gum 10 minutes before your workout. The Military Energy Gum (MEG) sold on Amazon contains 100 mg. per Chicletty-looking piece.
That means that a 200-pound lifter would need to pop two pieces before a workout to hit the low end of the scientists' recommended dosage (2 mg./kilogram). Plasma levels of caffeine would peak quickly (with the gum) but would start to wane within an hour or so.
- Brad Schoenfeld, Jozo Grgic, Filip Sabol, Sandro Venier, et al. "Caffeine Supplementation for Powerlifting Competitions: An Evidence-Based Approach," Journal of Human Kinetics, volume 68/2019, 37-48.