Naoki Nishimura

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We examined the effects of repeated artificial CO2 (1,000 ppm) bathing on tympanic temperature (T ty), cutaneous blood flow, and thermal sensation in six healthy males. Each subject was immersed in CO2-rich water at a temperature of 34°C up to the level of the diaphragm for 20 min. The CO2-rich water was prepared using a multi-layered composite hollow-fiber(More)
The effects of acupuncture stimulation at 5 Hz and 100 Hz on mental stress-induced sweating were analyzed, and the mechanisms involved were examined using the rate of sweat expulsion as an estimate of central sudomotor outflow. Mental arithmetic was imposed on 25 young healthy volunteers for 2 min before, during and after the stimulation. Acupuncture(More)
We investigated the effects of low-intensity pulsed ultrasound on distraction osteogenesis in a rabbit model. Callotasis of the right tibia was performed in 70 male Japanese white rabbits using mini-external fixators. In the first part of the study in 64 animals using normal distraction (waiting period seven days; distraction rate 0.5 mm/12 hours;(More)
During the past several decades, obesity has been increasing globally. In Japan, obesity is defined by a BMI of 25 kg/m² or over; 28.6 % of men and 20.6 % of women are obese. Obese people have an increased incidence of developing cardiovascular, renal, and hormonal diseases and sleep disorders. Obese people also have shortened sleep durations. We(More)
Syncope is defined as a transient loss of consciousness and postural tone, characterized by rapid onset, short duration, and spontaneous recovery, and the process of syncope progression is here described with two types of sympathetic change. Simultaneous recordings of microneurographically-recorded muscle sympathetic nerve activity (MSNA) and continuous and(More)
We studied how facial fanning during hyperthermia improves the thermal comfort sensation. Experiments were carried out on ten male subjects. They were immersed in hot water at 40°C for 45 min. At 20 min and 35 min, fanning (1 m·s–1) was applied to their faces for 5 min. Core temperature (T c) measured as esophageal temperature (T es) and tympanic(More)
Both spectral power within the low-frequency component, i.e., 0.04 to 0.15 Hz, of systolic pressure and muscle sympathetic nerve activity are increased during head-up tilt. The nerve activity during tilt is altered after space flight and exposure to simulated microgravity. In the present study, correlations of the low-frequency component and the nerve(More)
To test the hypothesis that mist sauna is a safer way of bathing than dry sauna, we compared changes in circulatory and thermoregulatory functions during 10 min sauna bathing in mist sauna at 40 ̊C with relative humidity of 100%, and in dry sauna by infrared ray at 70 ̊C with relative humidity of 15%. Subjects were seven healthy young men aged 29 ± 6 yrs(More)
In summer and winter, young, sedentary male (N = 5) and female (N = 7) subjects were exposed to heat in a climate chamber in which ambient temperature (Ta) was raised continuously from 30 to 42°C at a rate of 0.1°C min(-1) at a relative humidity of 40%. Sweat rates (SR) were measured continuously on forearm, chest and forehead together with tympanic(More)
INTRODUCTION The aim of this study was to investigate the consequences of 20 d of physical inactivity using head-down bed rest (HDBR) at -6 degrees on leptin, ghrelin, and counter-regulatory hormone responses. METHODS Eight male volunteers were subjected to HDBR for 20 d. Variables measured before, during, and after HDBR included plasma cortisol, insulin,(More)