2.2. Experimental Design

Following baseline assessments of maximal strength and a familiarisation trial, the acute effects of caffeine on maximal strength were assessed, which was immediately followed by chronic caffeine consumption through a resistance training program (Figure 1). Finally, the acute effects of caffeine on muscular strength were reassessed following completion of the training program.

Schematic of experimental design.

Prior to the assessment of the acute effects of caffeine, participants were asked to abstain from caffeine at least 12 h before testing and intense physical activity at least 48 h prior. As outlined below, when prescribed participants consumed caffeine (3 mg·kg⁻¹; Myprotein, UK) or a placebo (3 mg·kg⁻¹; maltodextrin; Myprotein, UK) issued in a transparent capsule (Bulk^TM, UK). The ergogenic effect of caffeine supplementation at this dose is well established [3,22,23], and also closely represents a dose achievable without the need for caffeine anhydrous.