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Mean change in concentration of deoxy-Hb overall following placebo, 50 mg L-theanine (L-thea), 75 mg caffeine (Caff) and a combination of 50 mg L-theanine and 75 mg caffeine (Combi) per consumer status. Treatment × consumer status interaction effects are shown for deoxygenated haemoglobin (***p < 0.005)
