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Volume 23 (1974 - 197･･･
- Issue 4 Pages 117-
- Issue 3 Pages 89-
- Issue 2 Pages 53-
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Volume 23, Issue 4
Displaying 1-5 of 5 articles from this issue
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KASUMI SAKAKI1974 Volume 23 Issue 4 Pages 117-124
Published: December 01, 1974
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSRelative metabolic rate (R.M.R.) is determined by quantity of O2 consumption in a unit time length under certain working condition.
Then RMRs volues of isometric exercises and mental works have been reportedly obtained to be quite small.
Nevertheless, the weight decrease and conscious fatigue result in after exercises.
Whether the energy consumption should be calculated based on O2 consumption alone, or not, may be of matter of discussion.
For this reason, changes in sebaceous secretion upon various low RMR works should be examined.
In this report the fundamental experiments within the series are included, as follows.
1) The lipids of sebum over the skin surface were found to be mostly Triglyceride and Free Fatty Acid. The individual differences were quite remarkable.
2) When the temperature of the skin was high, and when active exercises took place much, amount of sebaceous secretion was observed to be high. The sebaceous secretion seemed to provide some counter measure obesity.
3) On the occation of isometric exercises, the sebaceous secretion increased nearly twice in the quantity as usual. The sebaceous secretion during mental works also significantly increased.View full abstractDownload PDF (891K) -
—A RELATIONSHIP BETWEEN RECRUITMENT ORDER AND THE GRADIENT OF TENSION INCREASE—Hiroshi KURATA1974 Volume 23 Issue 4 Pages 125-133
Published: December 01, 1974
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSIn order to examine variations in the recruitment order of motor units, voluntary contraction of m. vastus medialis was studied at various gradients of tension increase. Two inserted electrodes were used for the recording of spike discharges of two or three motor units. Spike discharges were recorded simultaneously with the value of tension of knee extension and with the integrated value of surface electromyograms (EMG) .
The threshold value of a motor unit depended on the gradient G (kg/sec) of the tension increase. A similar change was also found in the latency time Tl (sec), where Tl is the time interval from the onset of EMG to the moment of recruitment of a motor unit. The relation Tl =ρG-1+λX was experimentally found, where ρ is a proportional constant. The motor unit with a positive/negative value of λ is characterized to be static/phasic.View full abstractDownload PDF (4704K) -
A. NAGATA, H. KITAMOTO1974 Volume 23 Issue 4 Pages 134-143
Published: December 01, 1974
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSThe purpose of this study is to clarify the function of many pursuit movements on the leg muscle strength. As the means of this experiment, the endurance strength of the under-leg muscle was used and the sitting position was applied. Pursuit movements indicated are to track one target of four kinds waves showing on the oscillograph, which consist of 1) sinus, 2) triangular, 3) rectangular, and 4) sawtooth waves and various frequency ranges (0.1-0.9Hz) . The condition of the tracking movements is to maintain the added muscle strength of 1/2 level of maximum strength as long as one can be possible.
To record the effects of the experiment, following items were adopted : 1) EMG 2) Heart Rate 3) Target curve 4) Pursuit curve 5) Error values between both curves 6) Phase changes between both curves. These records were analyzed by the method of auto-control theory and following points were obtained.
1. The optimal limit of the wave frequency on the pursuit endurance movement were about 0.5Hz.
2. The sawtooth wave target was easy and good performance to track the leg muscle strength and had the longest endurance time to maintain also.
3. Near the all-out condition of the pursuit, the amplitude of EMG in the M. Rectus Femoralis and the beats of Heart Rate increased gradually till twice times as the fresh condition but there were no changes of EMG and H.R. according to the variety of wave sorts and frequency.
4. The phase difference between the target and controlled waves was reversed at the fast frequency of 0.7Hz more, and under 0.6Hz, this phase was supported somehow.
5. As the control element of the pursuit movent, the leg muscle effecter showed the high amplified gain in proportion to the endurance time and the high frequency.View full abstractDownload PDF (1070K) -
KUNIHIKO HARADA, YASUTAKA KOBAYASHI, KEIZO KOBAYASHI, KOJI HASHIZUME, ...1974 Volume 23 Issue 4 Pages 144-146
Published: December 01, 1974
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (249K) -
1974 Volume 23 Issue 4 Pages 147-150
Published: December 01, 1974
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (508K)
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