Does caffeine tolerance really exist?

[eatyourspinach]

https://www.tandfonline.com/doi/abs/...nalCode=tejs20

Acute effects of caffeine supplementation on resistance exercise, jumping, and Wingate performance: no influence of habitual caffeine intake

Abstract

This study explored the influence of habitual caffeine intake on the acute effects of caffeine ingestion on resistance exercise, jumping, and Wingate performance. Resistance-trained males were tested following the ingestion of caffeine (3 mg/kg) and placebo (3 mg/kg of dextrose). Participants were classified as low caffeine users (n = 13; habitual caffeine intake: 65 ± 46 mg/day) and as moderate-to-high caffeine users (n = 11; habitual caffeine intake: 235 ± 82 mg/day). Exercise performance was evaluated by measuring: (a) movement velocity, power, and muscular endurance in the bench press; (b) countermovement jump; and, (c) a Wingate test, performed in that order. Two-way repeated-measures ANOVA revealed a significant main effect (p < 0.05) for condition in the majority of analyzed exercise outcomes. In all cases, effect sizes for condition favoured caffeine and ranged from 0.14 to 0.97. Mean increases in velocity and power in resistance exercise ranged from 0.02 to 0.08 m/s and 42 to 156 W, respectively. The number of performed repetitions increased by 1.2 and jump height by 0.9 cm. Increases in power in the Wingate test ranged from 31 to 75 W. We did not find significant group × condition interaction effect (p > 0.05) in any of the analyzed exercise outcomes. Additionally, there were no significant correlations (p > 0.05; r ranged from −0.29 to 0.32) between habitual caffeine intake and the absolute change in exercise performance. These results suggest that habitual caffeine intake might not moderate the ergogenic effects of acute caffeine supplementation on resistance exercise, jumping, and Wingate performance.

[Rsurf72]

Interesting study. I've almost puked from taking too much caffeine after coming off from a long break. Or maybemy body was just hellstressed.

[eatyourspinach]

Interesting study. I've almost puked from taking too much caffeine after coming off from a long break. Or maybemy body was just hellstressed.

guess it could have been worse if it stimulating your bowels too much

[TheFugitive]

Does caffeine improve your workout?

[Brankov88]

Does caffeine improve your workout?

It does but also I cant fall asleep after midnight when I take pre-workout around 18:00!

[eatyourspinach]

Does caffeine improve your workout?

Yes, I notice a difference when I do use it vs. when I don't. Often times when questioning it's effectiveness a user's usage habits are referred to which maybe has only to do with it's cognitive effects rather than physical though.

[TheFugitive]

It does but also I cant fall asleep after midnight when I take pre-workout around 18:00!

I have the same issue, so I started using a stim free preworkout with a decent amount of Beta Alanine