29/12/2020
How it works?
The scientific consensus now is that caffeine has a similar structure to adenosine, which is a natural substance in our body that triggers drowsiness. Caffeine competitively inhibits adenosine by attaching to its receptors, thus blocking the drowsiness effect.
The resulting effect of caffeine being- increased heart rate, blood pressure, wakefulness, and alertness. When it comes to exercise, antagonism of adenosine receptors also results in less perceived pain, less perceived exertion, and enhanced maintenance of motor unit firing rates.
What types of exercises are improved by caffeine?
Edurance
- Recent met analysis of 44 studies looking at caffeine effect on time trails found a reduction in time to completion by 2%. (i.e. finishing a race quicker)
Strength and power
- A meta analysis from 2010 by warren at al found caffeine to increase maximum voluntary contraction of a muscle, and muscular endurance (number of reps to failure for all those bro lifters)
Caffeine fits in a second tier of supplements (below creatine) in its effect size
Dose
Literature points to between 3-6mg/kg before your workout is optimal. Anything above that yells no addition performance boost with the possibility of side effects
Source
pretty easy- coffee. Caffeine anhydrous came out when there was still mixed evidence if some compound in coffee blunted caffeines effect. But this has since been shunned and overall coffee absorption and effect size is A Okay.
Timing
Taken together however the general recommendation is 45-60 minutes before hand
Caffeines effect over time
Caffeines effect on cycling after 28 days of 3mg’/kg showed performance diminished, whilst the placebo group didn’t. For now maybe wise to prioritise caffeine for your big sessions. And take some time off to enjoy its effects (2 weeks)
Health concerns
The common health concerns pertaining to caffeine are fairly exaggerated within normal ranges of dosing (below 400-600 mg per day), and regular consumption of tea and coffee within this range are associated with neutral to positive effects on a wide range of health outcome i.e. depression, arthritis.
Source: stronger by science