136 Section PHYSIOLOGICAL ANTHROPOLOGY PHYSIOLOGICAL RESPONSES TO REPEATED INHALATIONS OF TREE ODORS IN INFANTS Tsunetsugu Yuko1 , Yamashita Yasuko2 1Forestry and Forest Products Research Institute, Tsukuba, Japan 2Central Research Center, Pigeon Corporation, Tsukubamirai, Japan We investigated the physiological responses to inhalations of odorous components of coniferous trees in infants. <...> The participants were 57 infants of 1-3 months old whose parents gave a written informed consent. <...> Each infant was exposed for two or three minutes to three different odors of α-pinene, limonene and a control (air). <...> Two or three minutes of rest were taken before and after the exposure to odors. <...> During this rest-inhalation-rest course, cerebral activity (NIRO200, Hamamatsu Photonics KK.) and an electrocardiogram (Polymate II AP-216, TEAC) were continuously measured. <...> Heart rate and heart rate variability were calculated from the electrocardiogram. <...> The measurements were repeated with a 2-week interval until the infants became 3.5 months old. <...> The cerebral activity was enhanced in response to all three odors including the control. <...> The heart rate signifi cantly decreased in response to α-pinene (p<0.05), but not to limonene and the control. <...> The heart rate during the inhalations of the odors decreased as the number of repetition increased (p<0.01). <...> The sympathetic and parasympathetic nervous activities, which were assessed by heart rate variability analysis, did not show signifi cant changes. <...> We consider that the measurement system we have built for assessing infants’ physiological responses to odors is useful, but further investigations are still necessary as there were many missing data accompanying infants’ crying or sleeping. <...> Key words: near infrared spectroscopy, heart rate, heart rate variability, olfactory stimulation Contact information: Tsunetsugu Yuko, e-mail: yukot@ffpri.affrc.go.jp. <...> EFFECT OF SINUSOIDAL LOWER-BODY NEGATIVE PRESSURE ON CEREBRAL BLOOD FLOW AND EVENT-RELATED POTENSIALS Yoshida Hisao, Ootaka Masaki, Ishibashi Keita, Iwanaga Koichi Graduate School of Engineering, Chiba University, Chiba, Japan A decrease in central venous pressure caused by orthostatic stress reduces the cerebral blood fl ow. <...> Lower-body negative pressure is used as a perturbation to the cardiovascular system and has been applied to simulate the gravitational stress of orthostatic blood <...>