F-2-19-09
THE ANKLE DORSIFLEXOR MUSCLE CONTRACTION IN HIGHER BRAIN DYSFUNCTIONS
Fujio Sakamoto, Nobusada Ishiko (Mimani Kyushu Rehabil. Hosp., Kokubu-shi, Kagoshima, Japan), Ken-Ichi Sakamoto (Yamaguchi Univ., Sch. Med., Ube-shi, Yamaguchi, Japan)
Contractile properties of the ankle dorsifiexor muscle in human subjects with and without motor disturbances of central origin were studied, using our own apparatus with which the magnitude and time course of the muscle contraction during weight-lifting tasks of the ankles were recorded bilaterally. To express the dynamic maximum strength (DMS) of the muscle, the amount of work (W, in 10-1 joule) done by a single twitch was plotted as a function of the weight of load (L, in Kg) which had been increased from 0-6.5Kg. To express endurance (SD) of the muscle contraction, the ratio of the amount of work at 30 sec after initiation of sustained contraction to that at the beginning was calculated. In this study, work done against a load was obtained by the formula, W=L x d, where "d" represents the distance (cm) between the resting and lifted positions of a load.
Of 11 healthy subjects studied, DMS and SD was found to be 35.2x10-1 joule and 80.9% in average, respectively, the former being several times greater than average DMS obtained from 11 patients with motor dysfunctions, whose SD varied widely from 0 to more than 100% depending on the degree and kind of the diseases. Most conspicuous difference in the quality of muscle contraction was lowering in the velocity of contraction observed in 81.8% of the patients, as compared with 9.1% seen in the healthy subjects. Non-linear increase in the work-load relationship was only found in 18.2 % of the patients. No apparent difference in the frequency of incomplete tetanus was found between two groups.
F-2-20-01
EVALUATION ON SURFACE AND DEEP TEMPERATURE OF PHANTOM IRRADIATED BY PULSED OR CONTINUOUS MICROWAVES
Tsuguo Yoshida (Tsukuba College of Technology, Tsukuba, Japan)
Abstract:
[PURPOSE] The purpose is to investigate the difference between pulsed and continued microwaves on the effect of surface and deep temperature of agar phantom.
[METHODS] On the pulsed microwave, the power was 200w, duty was 10%, the distance between the antenna and phantom was 3cm. On the continued microwave, the power was 100w, the distance between the antenna and phantom was 15cm. Irradiation time was 10 minutes in both cases. Alcoholic and optic fiber thermometers were used to measure the temperature of the phantom. The temperature was measured at point of the surface, 1cm, 2cm, 3cm and 4cm deep from the surface.
[RESULTS & CONCLUSION] In the depth of 1cm, the maximum increase of the temperature was measured by irradiation of both types of microwaves. There was no difference between of the ratio of deep/surface increase temperature between pulsed and continued microwaves at every point.
