Fig. 1From: 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 studyECG R-R interval changes and corresponding power spectra before, immediately after, and 30 min after the 10-min inhalation of yuzu fragrance and water in the follicular and late-luteal phases by a 22-year-old subject. LF: low frequency power (0.03–0.15 Hz); HF: high frequency power (0.15–0.5 Hz)Back to article page