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Volume 22, Issue 10-11
Displaying 1-6 of 6 articles from this issue
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Prof. Shigeshi Nagasawa1963 Volume 22 Issue 10-11 Pages 431-443
Published: February 28, 1963
Released on J-STAGE: September 09, 2010
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Kiyotune Inoue, Hsin Meng, Goro Sugiura, Takeshi Imagawa1963 Volume 22 Issue 10-11 Pages 444-452
Published: February 28, 1963
Released on J-STAGE: September 09, 2010
JOURNAL FREE ACCESSOn the sartorius muscle of Buf o vulgaris, dual stimuli of subthreshold strength were applied through Pratts pore-electrod or through the separating box devised by Sugi and the local excitation of muscle fiber evoked by the subthreshold stimulus was examined. Two contact keys of the pendulum of Azuma's type were used to produce the double electric pulses of short dura-tionwith short interval.
The duration of first puls was 55 usec and the second 60 μsec. The hight of local exita-tion coused by the first conditioned puls of subthreshold was tested by controlling the intensity of second puls. The minimal contraction of the muscle was used as the indicator of the effect of second puls. It became clear that the duration of the local excitation were ca 7 msec.
It developed promptly to its maximal strength in 1 msec and decayed to the nomal level after 1 msec, and then followed a reversed change (lowering of the excittability) for 3 msec. The change of the excitability caused by the subthreshold stimulus in the muscle showed in this way a quasi vibration.
Maximal height of the elevated excitability was proportional to the strength of the conditioned stimuli and the time constants of the decay were found to show similar values when the stimuli were weaker than 30-40% of the normal threshold.
Conditioned Stimuli stronger than 40% of the threshold caused to elongate the time nescessary for the descending of to the half value of the maximal height (half-time) . Half-time became longer and longer according to the strengthening of the conditioned stimuli, but the total duration of the appearance of local excitation was held strictly constant.
The local excitation was elevated under the influence of negative electrotonus and lowered by positive electrotonus. DFP and Eserine acts to lower the local excitability. Effect of the Acetylcholine upon the local excitation was not remarkable.View full abstractDownload PDF (1093K) -
Report I. Effect of keeping vigil and DrinkingTakeshi Imagawa, Kazuya Inoue, Yukihiko Ando, Yutaka Ichinose, Naoyosh ...1963 Volume 22 Issue 10-11 Pages 453-458
Published: February 28, 1963
Released on J-STAGE: September 09, 2010
JOURNAL FREE ACCESSThe present authors studied the reaction time from the view point of the traffic medicin. As the stimulus, the lighting of a tiny electric lamp was used. That lamp was placed 2 meters apart from the person who was examined. And the reaction time of hand and foot were measured.
The experiment on one person was begun at 3 or 4 o'clock p.m. and continued through all night until the noon of the next day. In this way the effect of sleepless was examined. The reaction time was elongated at first, then it shortened and reached to minimal value after several hours. Thereafter it increased gradually and in the morning of the next day it reached to its maximal value and then it became shorter.
The quasi rhythmical change of the reaction time such as an above mentioned type was recognized on many persons. Such a rhythm was also seen on the person who drinked“Sake”. Alchol acts always to elongate the reaction time. But when the dose was not large, it acts to shorter the reaction time at first then to elongate.View full abstractDownload PDF (695K) -
Ichiro Wakisaka, Toru Ito1963 Volume 22 Issue 10-11 Pages 459-464
Published: February 28, 1963
Released on J-STAGE: September 09, 2010
JOURNAL FREE ACCESSThe authors studied the fluctuation of mentally and physically functions of some heavy industrial workers who were working in shift. The results are as follows:
1) The average working intensity was light and sleeping hours were shortened in the shift, but the distribution of working hours and quantity of work were not different between day and night.
2) The phenomena of physical fatigue cleanly appeared after night shift and they were acompanied with para-sympaticotonic signs; decrease of puls rate, fall of diastolic blood pressure, fall of tapping and decrease of leucocytes.
3) The complaints of subjective symptoms, especially neuro-sensorial and physical symptoms, increased after work, but mental symptoms were not increased. The complaints of subjective symptoms had a tendency of increase after night shift, but this tendency was not decisive.View full abstractDownload PDF (617K) -
Hiroyoshi Watanabe1963 Volume 22 Issue 10-11 Pages 465-467
Published: February 28, 1963
Released on J-STAGE: September 09, 2010
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Juzo Takeda, Nobuo Urushibata, Tatuo Fujimaki, Kiyokata Sumi, Katumi A ...1963 Volume 22 Issue 10-11 Pages 468-470
Published: February 28, 1963
Released on J-STAGE: September 09, 2010
JOURNAL FREE ACCESSDownload PDF (3221K)
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