Aromatic effects of a Japanese citrus fruit—yuzu (Citrus junos Sieb. ex Tanaka)—on psychoemotional states and autonomic nervous system activity during the menstrual cycle: a single-blind randomized controlled crossover study

Abstract

BackgroundYuzu (Citrus junos Sieb. ex Tanaka), a yellow-golden colored citrus fruit, has traditionally been used to promote psychosomatic health in Japan. While the yuzu produces a distinctive, pleasing aroma of citrus and floral, the efficacy of its fragrance remains unknown. The present study investigated the soothing effects of the fragrance of yuzu essential oil from the perspective of autonomic nervous system activity, which plays a crucial role in the integrity of the mind-body connection.MethodsTwenty one women in their 20s participated in a single-blind randomized controlled crossover study. Subjects were examined twice each in the follicular and late-luteal phases. Two kinds of aromatic stimulation (yuzu and water as a control) were used. This experiment measured heart rate variability (HRV) reflecting autonomic nervous system activity and used the Profile of Mood States (POMS) as a psychological index before and after the aromatic stimulation.ResultsOnly a 10-min inhalation of the yuzu scent significantly decreased heart rate and increased high frequency power of HRV reflecting parasympathetic nervous system activity, regardless of menstrual phase. This significant physiological effect continued for at least 25 min. In addition, the POMS tests revealed that inhalation of the aromatic yuzu oil significantly decreased total mood disturbance, a global measure of affective state, together with two POMS subscales—tension-anxiety and fatigue, as long as 35 min after the aroma stimulation, both in the symptomatic late-luteal and non-symptomatic follicular phases.ConclusionsThe present study provides the novel information that yuzu’s aromatic effects could serve to alleviate negative emotional stress, which, at least in part, would contribute to the improvement of parasympathetic nervous system activity.

Wearable Sensors to Characterize the Autonomic Nervous System Correlates of Food-Like Odors Perception: A Pilot Study

“…On the other hand, an increased PNS activity, and an SNS decrease, was seen to occur when presenting pleasant odors, such as Ylang-Ylang [54] or citrus fruit-yuzu [55]. Therefore, the results obtained in the present work somewhat confirm the literature evidence about the autonomic activation mainly depending on the pleasantness of the odors administered.…”

Fractal Based Analysis of the Influence of Odorants on Heart Activity

“…Besides analyzing the nature of ECG signal, many scientists have tried to analyze the influence of different kinds of external stimulation on heart activity. The works reported on analyzing the influence of auditory123, visual456 and olfactory stimuli789 are noteworthy to mention.…”

The Effectiveness of Aromatherapy for Depressive Symptoms: A Systematic Review

“…The chemical composition and mechanism of action of the essential oils used have shown beneficial effects on mood parameters such as anxiety, depression, and sedation which support their use in the clinical studies included [42, 57–59]. For instance, lavender [57], bergamot [58], and sandalwood [42] have shown to improve depressive symptoms while yuzu alleviates negative emotional stress [59].…”