Thermal Dependence of Isometric Contractile Properties of Lizard Muscle

Robert W. Putnam; Albert F. Bennett

doi:10.1007/BF00689285

Thermal Dependence of Isometric Contractile Properties of Lizard Muscle

Robert W. Putnam, Albert F. Bennett

Wright State University

Research output: Contribution to journal › Article › peer-review

Abstract

<ol> <li> </li> </ol> The thermal dependence of the isometric contractile properties of the iliofibularis and gastrocnemius muscles were studied at 5°C intervals from 10–50°C in lizards with different preferred body temperatures (PBT): Dipsosaurus dorsalis (PBT: 40–42°C); Cnemidophorus murinus (40°C); Sceloporus occidentalis (35°C); and Gerrhonotus multicarinatus (25–30°C). <li> </li> Isometric twitch and tetanic tensions were constant over a broad temperature range (as much as 25°C) in all species. Tetanic tension declined by 50% at 45–47.5°C in Dipsosaurus , 42.5°C in Cnemidophorus , and 40°C in Sceloporus and Gerrhonotus . <li> </li> Twitch contraction time (CT-the time to the peak twitch tension) increased with decreasing temperature from 10 ms to 300 ms. At any given temperature, the muscles of Sceloporus and Gerrhonotus had faster CTs than those of the other species. The CTs were minimal at the maximal test temperature. <li> </li> The maximal rate of tension development with tetanic stimulation ( dP o /dt) was strongly temperature dependent and was maximal at 40–45°C in Dipsosaurus , 40–42.5°C in Cnemidophorus , and 35°C in Sceloporus and Gerrhonotus . <li> </li> The time properties of these muscles are highly temperature dependent and contractile tensions are broadly temperature independent. Except in Gerrhonotus muscles, the combination of twitch speed and tension generating capability is maximal at PBT, although neither parameter alone is maximized at PBT.

Original language	American English
Journal	Journal of Comparative Physiology
Volume	147
DOIs	https://doi.org/10.1007/BF00689285
State	Published - Jan 1 1982

Disciplines

Medical Cell Biology
Medical Neurobiology
Medical Physiology
Medical Sciences
Medicine and Health Sciences
Neurosciences
Physiological Processes

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http://dx.doi.org/10.1007/BF00689285

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title = "Thermal Dependence of Isometric Contractile Properties of Lizard Muscle",

abstract = " The thermal dependence of the isometric contractile properties of the iliofibularis and gastrocnemius muscles were studied at 5°C intervals from 10–50°C in lizards with different preferred body temperatures (PBT): Dipsosaurus dorsalis (PBT: 40–42°C); Cnemidophorus murinus (40°C); Sceloporus occidentalis (35°C); and Gerrhonotus multicarinatus (25–30°C). Isometric twitch and tetanic tensions were constant over a broad temperature range (as much as 25°C) in all species. Tetanic tension declined by 50% at 45–47.5°C in Dipsosaurus , 42.5°C in Cnemidophorus , and 40°C in Sceloporus and Gerrhonotus . Twitch contraction time (CT-the time to the peak twitch tension) increased with decreasing temperature from 10 ms to 300 ms. At any given temperature, the muscles of Sceloporus and Gerrhonotus had faster CTs than those of the other species. The CTs were minimal at the maximal test temperature. The maximal rate of tension development with tetanic stimulation ( dP o /dt) was strongly temperature dependent and was maximal at 40–45°C in Dipsosaurus , 40–42.5°C in Cnemidophorus , and 35°C in Sceloporus and Gerrhonotus . The time properties of these muscles are highly temperature dependent and contractile tensions are broadly temperature independent. Except in Gerrhonotus muscles, the combination of twitch speed and tension generating capability is maximal at PBT, although neither parameter alone is maximized at PBT.",

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year = "1982",

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doi = "10.1007/BF00689285",

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T1 - Thermal Dependence of Isometric Contractile Properties of Lizard Muscle

AU - Putnam, Robert W.

AU - Bennett, Albert F.

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Y1 - 1982/1/1

N2 - The thermal dependence of the isometric contractile properties of the iliofibularis and gastrocnemius muscles were studied at 5°C intervals from 10–50°C in lizards with different preferred body temperatures (PBT): Dipsosaurus dorsalis (PBT: 40–42°C); Cnemidophorus murinus (40°C); Sceloporus occidentalis (35°C); and Gerrhonotus multicarinatus (25–30°C). Isometric twitch and tetanic tensions were constant over a broad temperature range (as much as 25°C) in all species. Tetanic tension declined by 50% at 45–47.5°C in Dipsosaurus , 42.5°C in Cnemidophorus , and 40°C in Sceloporus and Gerrhonotus . Twitch contraction time (CT-the time to the peak twitch tension) increased with decreasing temperature from 10 ms to 300 ms. At any given temperature, the muscles of Sceloporus and Gerrhonotus had faster CTs than those of the other species. The CTs were minimal at the maximal test temperature. The maximal rate of tension development with tetanic stimulation ( dP o /dt) was strongly temperature dependent and was maximal at 40–45°C in Dipsosaurus , 40–42.5°C in Cnemidophorus , and 35°C in Sceloporus and Gerrhonotus . The time properties of these muscles are highly temperature dependent and contractile tensions are broadly temperature independent. Except in Gerrhonotus muscles, the combination of twitch speed and tension generating capability is maximal at PBT, although neither parameter alone is maximized at PBT.

AB - The thermal dependence of the isometric contractile properties of the iliofibularis and gastrocnemius muscles were studied at 5°C intervals from 10–50°C in lizards with different preferred body temperatures (PBT): Dipsosaurus dorsalis (PBT: 40–42°C); Cnemidophorus murinus (40°C); Sceloporus occidentalis (35°C); and Gerrhonotus multicarinatus (25–30°C). Isometric twitch and tetanic tensions were constant over a broad temperature range (as much as 25°C) in all species. Tetanic tension declined by 50% at 45–47.5°C in Dipsosaurus , 42.5°C in Cnemidophorus , and 40°C in Sceloporus and Gerrhonotus . Twitch contraction time (CT-the time to the peak twitch tension) increased with decreasing temperature from 10 ms to 300 ms. At any given temperature, the muscles of Sceloporus and Gerrhonotus had faster CTs than those of the other species. The CTs were minimal at the maximal test temperature. The maximal rate of tension development with tetanic stimulation ( dP o /dt) was strongly temperature dependent and was maximal at 40–45°C in Dipsosaurus , 40–42.5°C in Cnemidophorus , and 35°C in Sceloporus and Gerrhonotus . The time properties of these muscles are highly temperature dependent and contractile tensions are broadly temperature independent. Except in Gerrhonotus muscles, the combination of twitch speed and tension generating capability is maximal at PBT, although neither parameter alone is maximized at PBT.

UR - https://corescholar.libraries.wright.edu/ncbp/741

UR - http://dx.doi.org/10.1007/BF00689285

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DO - 10.1007/BF00689285

M3 - Article

VL - 147

JO - Journal of Comparative Physiology

JF - Journal of Comparative Physiology

ER -

Thermal Dependence of Isometric Contractile Properties of Lizard Muscle

Abstract

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