| Project/Area Number |
04670053
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
General physiology
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| Research Institution | Teikyo University |
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Principal Investigator |
KOBAYASHI Takakazu Teikyo Univ., Sch.of Med., Lecturer, 医学部, 講師 (00112756)
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| Co-Investigator(Kenkyū-buntansha) |
NOGUCHI Kazunari Teikyo Univ., Sch.of Med., Med.Doctor, 医学部, 助手
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Heat measurement / HgCdTe infrared detector / Frog skeletal muscle / Isometric tetanus / Local heat production / 等尺性収縮 / ヒートレート / 1次元走査 / 光チョッパ |
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| Research Abstract |
Measurements of heat production during contraction have been performed by use of a thermopile to obtain information about the mechanism of chemomechanical conversion in muscle contraction. In the thermopile experiment, there is some assumption that all the local region of muscle respond mechanically and thermally in the same manner. It is possible to obtain information about heat produced along the long axis of muscle during muscle contracion by the thermopile, but not possible to do that in the local region of muscle. It is unknown (1) whether time course of heat production in the local region of tetanized muscle is same as that in the whole region. (2) how thermal distribution on the muscle surface in the resting muscle is shown, and how it changes immediately after isometric tetanus. (3) how local heat produced during isometric tetanus relates to mechanical response of the same region.
We constracted heat measurement apparatus by use of HgCdTe infrared detector and used a thermography to investigate above questions. Frog sartorius muscle (Rana catesbeiana) was mounted to the holder at in situ length with several metal fine markers and isometrically tetanized for 2-5 sec. Time course of heat production in central local region of muscle was same as that in whole region of muscle measured by the thermopile with 3 heat rate components. Thermal distributions in the resting and tetanized muscle were non-uniform along the entire length of muscle. In general, the local regions near pelvic end and central part tended to shorten by stretching those near the tibial end, and the amount of heat production during isometric tetanus was larger in the former thanin the latter. These result indicate that the local thermal and mechanical responses during isometric tetanus are not uniform along the entire length of the muscle.
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