Habitual pre-exercise caffeine supplementation prevents exercise-training induced attenuation of exercising systolic blood pressure and double-product.

We examined the effect of habitual pre-exercise caffeine supplementation on training-induced adaptations to exercising systolic (SBP), diastolic (DBP), pulse pressure (PP), heart rate (HR), and double product (DP). Young women (mean±SD; 24±7 y) were randomized to a caffeine (120 mg) supplement (CAF; n=17) or placebo (PLA; n=16) group, completed 6-weeks of high intensity exercise training on three non-consecutive days per week, and supplemented with CAF or PLA 30-60 minutes before exercise or else upon waking. Before (PRE) and after (POST) the intervention, SBP, DBP, and HR were measured, and PP and DP calculated, at rest and during fixed-power exercise at 50W and 75W.

Acute, dose-response effects of guayusa leaf extract on mood, cognitive and motor-cognitive performance, and blood pressure, heart rate, and ventricular repolarization.

Purpose: We conducted a randomized, double-blind, placebo-controlled crossover trial in young adults to examine the dose-dependent (600 mg versus 1200 mg), acute effects of consumption of an tea extract (GLE) on mood, cognitive and motor-cognitive performance, as well as its acute cardiovascular effects.

Methods: Twenty-five adults (mean ± SD, age = 28 ± 7 y; 9 M/16 F) completed familiarization and then three randomly ordered experimental visits where they consumed either 600 mg (GLE) or 1200 mg (GLE) GLE or placebo (PLA). Following supplement consumption, participants completed a mood state survey, assessments of perceived jitteriness, energy, and focus, and neurocognitive and motor-cognitive testing.