体力科学

脈波の伝達に関する研究

川上吉昭, 黒沢直次郎, 菊地浩

1967 年 16 巻 2 号 p. 31-37
発行日: 1967/06/01
公開日: 2010/09/30

DOIhttps://doi.org/10.7600/jspfsm1949.16.31

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The simultaneous recording of ECG and the pulse wave at the big toe was obtained. The time of transmission of the pulse wave was expressed as the RP-index which was obtained by dividing the interval between the R waves in ECG and the pulse wave by the distance between the tip of the xyphoid process and the medial malleolus. Using the RP-index as the indicator of changes of blood vessels, its relations with the age, sex, the place of residence, the blood pressure, change of retinal vessels, ECG changes, vascular fragility and serum cholesterol level were studied. Its changes after exercise were also studied.
1) No significant correlation was noted between the age and the RP-index.
2) No significant difference in the RP-index was noted between the male and the female and between the resident of the urban area and those of the rural area.
3) A significant negative correlation was noted between the RP-index and the blood pressure, especially the diastolic pressure.
4) The RP-index tended to be smaller in individuals with arteriosclerotic changes of retinal vessels than in those without them (p<0.01-0.05) .
5) The RP-index tended to be smaller in individuals with signs of hypertrophy or myocarial damage in ECG than in those without them.
6) The RP-index tended to decrease as vascular fragility increased (p<0.01-0.05) .
7) No correlation was found between the RP-index and the serum total cholesterol level.
8) The RP-index was noted to increase with exercise loading.

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骨格筋線維の発達に関する組織学的研究

菊池邦雄

1967 年 16 巻 2 号 p. 38-44
発行日: 1967/06/01
公開日: 2010/09/30

DOIhttps://doi.org/10.7600/jspfsm1949.16.38

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The purpose of this study is to inquire histologically when red muscle fibers and white muscle fibers are differenciated and how they develope, considering from sex difference.
Wistar-strain rats of the same venter were used in this experiment. The animals of both sexes were killed at the interval of five days, from birth to 25 days. Two groups of male and female rats of 70 days old after birth were used as control groups.
M. tibialis ant. was removed and then fixed in 10% formalin for approximately two weeks. As staining, alchohol solution of Sudan black B was used.
The results are as follows :
1) Sex difference in rats' body weight was started to appear about 15 days after birth.
2) Differentiation of red muscle fibers and white muscle fibers in M. tibialis ant. was recognized about 15 days after birth in male and female rats.
3) The entire area of cross section of M. tibialis ant. is increasing during the development of rats' body as a whole. No apparent tendency on sex difference was found till 25 days after birth. On 70 days after birth the entire area of cross section in male has about 1.5 times the size of female.
4) No increase of number in M. tibialis ant. was recognized during the development of rats' body as a whole and no sex difference in number of muscle fibers.
5) The area of cross section per fiber and the average diameter of fibers are increasing during the growth of rats' body. No sex difference of those in red and white muscle fibers was found till 25 days after birth but, on 70 days after birth, it became clear. The rate of hypertrophy of white muscle fibers is greater than that of red muscle fibers.
6) Ratio of the entire area of muscle fibers to the intercelluler space in M. tibi-alis ant. is increasing during the development of rats' body.
7) No difference of area of cross section per fiber in peripheral and innermost regions was found till about 15 days after birth. On 70 days after birth the red muscle fibers in peripheral have 1.4 times the size of those in innermost, and the white muscle fibers 1.3 times.

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垂直跳及び立幅跳の練習効果に関する筋電図学的研究

小野三嗣, 高橋泰光, 木村一彦, 原田邦彦, 生田香明, 宮本洋子, 笹部桂子

1967 年 16 巻 2 号 p. 45-56
発行日: 1967/06/01
公開日: 2010/09/30

DOIhttps://doi.org/10.7600/jspfsm1949.16.45

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体育科学生男女5名の被検者について垂直跳及び立幅跳を連続2ケ月間測定を行うと同時に大腿直筋, 大臀筋, 大腿2頭筋及び腓腹筋の筋電図をの記録し, 本実験終了後3ケ月の休止期を置いて再検査を行った結果, 大要次の如き結果を得た。
1) 2ケ月連続的に計測を反復した結果, 立幅跳の記録は増加したが, 垂直跳は大きな変動を認めなかった。3ケ月の休止によっては両者とも跳躍記録の低下をみとめなかった。
2) 主動4筋の跳躍時活動開始時点及び最大収縮到達時点の配列順序は計測反復によって一定の形に変化していくという現象は認められない。
3) 主動4筋の筋収縮時間の統計は短縮する傾向を示した。
4) 垂直跳では大腿直筋と腓腹筋の最大収縮到達時点の差が大きくなるほど跳躍高が減少した。立幅跳ではこのような関係がみとめられない。
5) 垂直跳では跳躍記録が良い場合は, 悪い時に比較して筋収縮時間には大きな変化を認めないが, 収縮開始から最大収縮に達するまでの時間が短縮する。特に大腿2頭筋の収縮のパターンが最も大きく変化する。
6) 立幅跳では好記録の場合の方が著しく筋収縮時間が短縮しており, 最大収縮到達時点の4筋間の配列順序も若干変化している
7) 垂直跳では跳躍高を最大から2/3, 1/3へと減少させると主動4筋の活動順序に大きな変化がおこる。筋収縮時間は最大から2/3へ向っては減少するが, 2/3と1/3との間では変化しない。
8) 立幅跳では跳躍幅を最大から2/3, 1/3へと減少させるに従って正比例的に筋収縮時間が減少するが, 主動4筋の活動順序系列には変化があらわれない。

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