Yoshiki Sugiyama

Learn More
Orthostatic intolerance is common when astronauts return to Earth: after brief spaceflight, up to two-thirds are unable to remain standing for 10 min. Previous research suggests that susceptible individuals are unable to increase their systemic vascular resistance and plasma noradrenaline concentrations above pre-flight upright levels. In this study, we(More)
We investigated the effects of laughing and weeping induced by watching comedy and tragedy videos on mood and autonomic nervous function. Ten healthy female subjects volunteered for the experiment. Chest electrocardiogram and respiration curve were recorded before, after, and during watching a comedy or a tragedy video. We also asked them to fill out(More)
BACKGROUND A combination of acute urinary retention and aseptic meningitis has not been well known. This combination can be referred to as meningitis-retention syndrome (MRS), when accompanied by no other abnormalities. OBJECTIVE To describe the results of a uro-neurological assessment in our patients with MRS. METHODS In three patients (two men, one(More)
Astronauts returning to Earth have reduced orthostatic tolerance and exercise capacity. Alterations in autonomic nervous system and neuromuscular function after spaceflight might contribute to this problem. In this study, we tested the hypothesis that exposure to microgravity impairs autonomic neural control of sympathetic outflow in response to peripheral(More)
When astronauts return to Earth and stand, their heart rates may speed inordinately, their blood pressures may fall, and some may experience frank syncope. We studied brief autonomic and haemodynamic transients provoked by graded Valsalva manoeuvres in astronauts on Earth and in space, and tested the hypothesis that exposure to microgravity impairs(More)
Cells respond to ER-stress via ER-stress sensors, leading to the UPR and subsequent apoptosis; however, occasionally, they activate autophagy without subsequent apoptosis in response to ER-stress. We previously showed that the induction of apoptosis by ER-stress was related to the presence or absence of CHOP expression; nevertheless, how ATF4 expression is(More)
Susceptibility to stress would presumably be different from person to person and be affected by the cause of the given stress. The purpose of this study was to investigate the interactive effects of task difficulty and subject's personality on mood and autonomic nervous function when stress was induced experimentally by tasks involving 3 degrees of(More)
We investigated the effects of ambient temperature on the sudomotor and vasoconstrictor components of skin sympathetic nerve activity (SSNA). The sympathetic traffic was measured by simultaneous microneurographic recording from post-ganglionic nerve fibres in the tibial and the peroneal nerves. When the ambient temperature was raised from 25° C to 34° C,(More)
We investigated the effects of vital exhaustion (VE) on cardiac autonomic functions in relation to working conditions such as overtime and frequent business trips, and to lifestyles such as smoking on 52 healthy middle-aged male workers. VE was evaluated by an abbreviated Maastricht Vital Exhaustion Questionnaire. Cardiac autonomic function at supine rest(More)
AIM The aim of this study was to compare the efficacy and safety of alpha1-adrenoceptor (alpha1-AR) antagonist monotherapy with combination therapy using alpha1-AR antagonist and anticholinergic agent for benign prostatic hyperplasia (BPH) with storage symptoms as the chief complaint. METHODS In this prospective comparative study, either 25-75 mg/day of(More)