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5 results on '"Norimasa, Morimitsu"'

1. Eyes Closing and Drowsiness in Human Subjects Decrease Baseline Galvanic Skin Response and Active Palmar Sweating: Relationship Between Galvanic Skin and Palmar Perspiration Responses

Author

Hideya Momose, Norimasa Morimitsu, Eiji Ikeda, Shigeki Kanai, Masao Sakaguchi, and Toshio Ohhashi

Subjects
GSR, perspiration ratemeter, palmar sweating, eyes closing, drowsiness, amygdala, Physiology, QP1-981
Abstract

We previously constructed a perspiration ratemeter for the measurement of palmar sweating in human subjects. Although galvanic skin response (GSR) has been used to evaluate emotional responses in human subjects, little is known about the relationships between the phasic and baseline components in GSR and active palmar sweating. From the aforementioned, we aimed to investigate the relationships in human subjects with handgrip exercise and eyes closing or opening. Fifteen healthy volunteers (mean age: 26.9 ± 8.7 years) participated in the present experiments. We investigated the effects of maximal handgrip exercise, eyes closing or opening, and self-awareness of drowsy on the GSR, active palmar sweating, R-R interval in electrocardiograph (ECG), and percentage of α wave in EEG. The faster phasic component in GSR completely agreed with the starting point of active palmar sweating. Handgrip exercise induced significantly faster spike in GSR, active palmar sweating, and decrease in R-R interval in ECG. Eyes closing produced significant decreases in baseline GSR and active palmar sweating in all human subjects. The percentage of α wave in electroencephalograph (EEG) also increased. In contrast, eyes opening increased significantly the baseline GSR and active palmar sweating. In the equivalent electrical model of human skin, the eyes closing–mediated time-dependent decrease in the baseline GSR completely agreed with the hypothesis that the palmar skin voltage only in the model decreased time dependently to 0.4 of the control during 6 min. The self-awareness of drowsy in mid-night working with computer produced similar decreases in baseline GSR and active palmar sweating to the responses with eyes closing in all human subjects. In conclusion, the faster spike in GSR completely agreed with the starting point of active palmar sweating. Eyes closing and opening or self-awareness of drowsy significantly produced changes in baseline GSR and active palmar sweating, which may become useful tools for evaluating clearness or drowsiness in human subjects.

Published
2020
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2. Another route of CO2 gas excretion independent of red blood cells in human lungs

Author

Yoshiko Kawai, Hideya Momose, Takashi Ishida, Tomomi Watanabe-Asaka, Nariaki Arai, Moyuru Hayashi, Toshio Ohhashi, Satoshi Tanaka, Mikito Kawamata, Norimasa Morimitsu, Susumu Ide, and Tatsuichiro Seto

Subjects
medicine.medical_specialty, medicine.diagnostic_test, Physiology, Chemistry, Clinical Biochemistry, Blood volume, Blood flow, Hematocrit, law.invention, Excretion, Endocrinology, law, Physiology (medical), Internal medicine, medicine.artery, Pulmonary artery, Circulatory system, medicine, Cardiopulmonary bypass, Base excess
Abstract

We demonstrated pulmonary arteriolar blood flow-mediated CO2 gas excretion in rabbit lungs. The shear stress stimulation produced CO2 gas in cultured human endothelial cells of pulmonary arterioles via the activation of F1/Fo ATP synthase. To confirm the findings in human subjects undergoing the operation with heart–lung machines, we aimed to evaluate the effects of a stepwise switch, from a partial to a complete cardiopulmonary bypass, of the circulatory blood volume (BV, 100% = 2.4 × cardiac index), on the end-expiratory CO2 pressure (PetCO2), maximal flow velocity in the pulmonary artery (Max Vp), the inner diameter (ID) of pulmonary artery, pulmonary arterial CO2 pressure (P mix v CO2), pulmonary arterial O2 pressure (P mix v O2), hematocrit (Hct), pH, the concentration of HCO3−, and base excess (BE) in mixed venous blood in 9 patients with a mean age of 72.3 ± 3.4 years. In addition, the effects of the decrease in Hct infused with physiological saline solution (PSS) on PetCO2 were investigated in the human subjects. An approximately linear relationship between the PetCO2 and Max Vp was observed. The pumping out of 100% BV produced little or no change in the Hct, pH, P mix v CO2, and P mix v O2, respectively. The hemodilution produced by intravenous infusion of PSS caused a significant decrease in the Hct, but not in the PetCO2. In conclusion, another route of CO2 gas excretion, independent of red blood cells, may be involved in human lungs.

Published
2021
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3. Another route of CO

Author

Susumu, Ide, Nariaki, Arai, Norimasa, Morimitsu, Hideya, Momose, Moyuru, Hayashi, Tomomi, Watanabe-Asaka, Takashi, Ishida, Satoshi, Tanaka, Tatsuichiro, Seto, Yoshiko, Kawai, Mikito, Kawamata, and Toshio, Ohhashi

Subjects
Male, Pulmonary Circulation, Cardiopulmonary Bypass, Erythrocytes, Humans, Female, Carbon Dioxide, Lung, Aged
Abstract

We demonstrated pulmonary arteriolar blood flow-mediated CO

Published
2021

4. Influence of capacitor properties on irregular ignition of discharge circuit using a thyristor

Author

Katsuo Hagiwara, Keiichi Miyairi, Eiji Itoh, Makoto Ishikawa, and Norimasa Morimitsu

Subjects
Reservoir capacitor, Materials science, business.industry, Time constant, Electrical engineering, Energy Engineering and Power Technology, Thyristor, Decoupling capacitor, law.invention, Ignition system, Capacitor, law, Optoelectronics, Transient (oscillation), Electrical and Electronic Engineering, Oscilloscope, business
Abstract

A misfire phenomenon taking place in a discharge circuit composed of a capacitor and thyristor has been investigated. This circuit was operated at a frequency of up to 198 Hz. A misfire was observed in a circuit with a PET capacitor at low temperatures, while no misfire was observed with a PP capacitor under any conditions. Transient currents in the range of 40 A to 1 mA were measured with a digital oscilloscope. In the case of a PET capacitor, the current initially decreased exponentially at a given time constant, but exhibited a slow decay which caused the misfire. This current is associated with residual charges trapped in the bulk of the PET film. © 2001 Scripta Technica, Electr Eng Jpn, 137(2): 1–7, 2001

Published
2001
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