Hiroshi Kawata

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PURPOSE To clarify differences in the dynamics of convergence eye movements in response to symmetrical stimuli between the dominant eye and the nondominant eye under natural viewing conditions. METHODS This study was conducted in 11 normal volunteers (age range, 22-30 years). The subject was seated on a chair, and the head was fixed using a bite-block.(More)
BACKGROUND Previous research has suggested that extraordinary adverse experiences during childhood, such as abuse, are possible risk factors for the development of chronic pain. However, the relationship between the perceived parental bonding style during childhood and chronic pain has been much less studied. METHODS In this cross-sectional study, 760(More)
Real-time pattern classification of electromyogram (EMG) signals is significant and useful for developing prosthetic limbs. However, the existing approaches are not practical enough because of several limitations in their usage, such as the large amount of data required to train the classifier. Here, we introduce a method employing a selective(More)
BACKGROUND Sleep disturbance and poor sleep quality are major health problems worldwide. One potential risk factor for the development and maintenance of sleep disturbance is the parenting style experienced during childhood. However, its role in sleep disturbance in adulthood has not yet been estimated. This Japanese population study was done to clarify the(More)
A windows 95/98 software program for simulating membrane excitation in nerve and skeletal muscle fiber has been developed. This program simulates (1) the action potentials of the nerve under two conditions (space clamped conditions and conducting conditions), (2) the membrane currents of the nerve under voltage clamped conditions, and (3) the propagated(More)
Post-tetanic potentiation (PTP) was mimicked by post-contracture potentiation (PCP) in the twitch muscle of frog. A marked PCP was observed in small bundles of semitendinosus muscle in tetrodotoxin (TTX)-containing solution under current clamp condition. Contractures were induced by a constant depolarizing current pulse of 1 s every 5 min. Each contracture(More)
Effects of Ba2+ ions on the contractility were investigated in the frog skeletal muscle under the current clamp condition. The membrane potential was depolarized by 10 to 20 mV by perfusing 2 mM Ba2+ for 5 to 10 min. Membrane resistance was first increased and then decreased. The mechanical threshold examined in TTX-containing solution was shifted to more(More)
In order to investigate the mechanism by which elevated extracellular Ca ions decrease twitch and tetanus tension in frog skeletal muscle we made mechanical and electrophysiological measurements on single fibers or small bundles from twitch muscles. High concentration of Ca caused a hyperpolarization and an increase in the duration of action potential. The(More)
The effects of low Na on the tetanic contractility after trains of twitch were investigated in frog skeletal muscle. Tetanic tension was induced by a stimulation of 100 Hz for 400 msec every 5 min and a train of twitches (150 or 250) with 1 Hz was interposed between two successive tetani. When the Na concentration was reduced to 50% by replacement with(More)
The effects of twitch trains on the contractility of succeeding tetani were investigated in the frog toe muscle. The changes in isometric tension and its first derivative were analyzed. Tetani of 1 sec duration were induced every 5 min and trains of twitches (less than 250) with 0.1 to 3 Hz were interposed between two successive tetani. A twitch train which(More)