The Use of Coffee Aroma for Stress Reduction in Postgraduate Dental Students

Abstract

ObjectivesThis study aimed to investigate the measure to reduce academic stress of graded oral presentation in postgraduate dental students using coffee aromatherapy. MethodsHealthy postgraduate dental students in a seminar class were divided into coffee (n = 32) or control (n = 26) group. There were three modes of aroma distribution: personal distribution with a coffee pad attached to a lanyard, a lanyard plus a personal fan for ventilation of the aroma, and the typical method of the diffuser to spread the aroma in the ambient air. The levels of salivary alpha-amylase (sAA), cortisol (sCort), and chromogranin A (sCgA) represented stress biomarkers. Pulse rates were also measured. ResultsThe levels of sAA increased 176.62 ± 30.26% between pre- and post-presentation in the control group. Inhaling coffee aroma during the presentation period significantly ameliorated sAA increase at 81.02 ± 14.90% (p = 0.015). sCort levels tended to decrease in the coffee group but not significantly. Surprisingly, sCgA levels actually increased more in the coffee group. Also, pulse rates decreased in the coffee group (-2.07 ± 2.81 bpm) and increased in the control group (6.90 ± 3.22 bpm; p = 0.035). Subgroup analysis did not reveal differences in salivary markers among three aroma distribution modes. ConclusionsCoffee aroma could have anxiolytic effect on postgraduate dental students as evidenced by sAA levels and pulse rates. Personal aroma distribution was also a useful and effective mode of aromatherapy.