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. 2016 Oct 24;11(10):e0165034. doi: 10.1371/journal.pone.0165034

Fig 4.

Fig 4

Changes in plasma epinephrine (a), norepinephrine (b) and caffeine (c) concentrations from pre to post ingestion of the supplement illustrated for all three groups. Dashed line represents placebo trail, bold line represents caffeine trial; ●, ○ = able-bodied, ■, □ = paraplegic and ▲, Δ = tetraplegic group.