Physiological characteristics of skeletal muscles of dogs and cats

L. C. Maxwell; J. K. Barclay; D. E. Mohrman; J. A. Faulkner

doi:10.1152/ajpcell.1977.233.1.C14

Physiological characteristics of skeletal muscles of dogs and cats

L. C. Maxwell, J. K. Barclay, D. E. Mohrman, J. A. Faulkner

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108 Scopus citations

Abstract

The purpose was to determine if physiological characteristics of skeletal muscles of dogs and cats are related to their histochemical and biochemical characteristics. Maximum oxygen conumption (VO₂max) and blood flow (Q) at VO₂max were determined for in situ muscles of dogs and cats. Compared to cat muscles, dog muscles per unit mass had higher succinate oxidase activities, VO₂max's, and Q's at VO₂max's. There are positive relationships between Q at VO₂ max and VO₂max and between VO₂max and succinate oxidase activity. The higher VO₂max's and succinate oxidase activities of dog muscles are consistent with the presence in these muscles of only slow-twitch fatigue-resistant fibers and fast-twitch fatigue-resistant fibers, whereas up to 50% of the fibers found in cat muscles are fast-twitch fatiguable. Capillary-to-fiber ratios are 2.40to 2.97 for dog muscles compared to 2.17 to 2.84 for cat muscles. Thus the 2- to 3-fold higher Q at VO₂max for dog muscles compared to cat muscles is not due to a greater number of capillaries.

Original language	English (US)
Pages (from-to)	C14-C18
Journal	American Journal of Physiology - Cell Physiology
Volume	233
Issue number	1
DOIs	https://doi.org/10.1152/ajpcell.1977.233.1.C14
State	Published - 1977
Externally published	Yes

ASJC Scopus subject areas

Physiology
Cell Biology

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10.1152/ajpcell.1977.233.1.C14

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title = "Physiological characteristics of skeletal muscles of dogs and cats",

abstract = "The purpose was to determine if physiological characteristics of skeletal muscles of dogs and cats are related to their histochemical and biochemical characteristics. Maximum oxygen conumption (VO2max) and blood flow (Q) at VO2max were determined for in situ muscles of dogs and cats. Compared to cat muscles, dog muscles per unit mass had higher succinate oxidase activities, VO2max's, and Q's at VO2max's. There are positive relationships between Q at VO2 max and VO2max and between VO2max and succinate oxidase activity. The higher VO2max's and succinate oxidase activities of dog muscles are consistent with the presence in these muscles of only slow-twitch fatigue-resistant fibers and fast-twitch fatigue-resistant fibers, whereas up to 50% of the fibers found in cat muscles are fast-twitch fatiguable. Capillary-to-fiber ratios are 2.40to 2.97 for dog muscles compared to 2.17 to 2.84 for cat muscles. Thus the 2- to 3-fold higher Q at VO2max for dog muscles compared to cat muscles is not due to a greater number of capillaries.",

author = "Maxwell, {L. C.} and Barclay, {J. K.} and Mohrman, {D. E.} and Faulkner, {J. A.}",

year = "1977",

doi = "10.1152/ajpcell.1977.233.1.C14",

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T1 - Physiological characteristics of skeletal muscles of dogs and cats

AU - Maxwell, L. C.

AU - Barclay, J. K.

AU - Mohrman, D. E.

AU - Faulkner, J. A.

PY - 1977

Y1 - 1977

N2 - The purpose was to determine if physiological characteristics of skeletal muscles of dogs and cats are related to their histochemical and biochemical characteristics. Maximum oxygen conumption (VO2max) and blood flow (Q) at VO2max were determined for in situ muscles of dogs and cats. Compared to cat muscles, dog muscles per unit mass had higher succinate oxidase activities, VO2max's, and Q's at VO2max's. There are positive relationships between Q at VO2 max and VO2max and between VO2max and succinate oxidase activity. The higher VO2max's and succinate oxidase activities of dog muscles are consistent with the presence in these muscles of only slow-twitch fatigue-resistant fibers and fast-twitch fatigue-resistant fibers, whereas up to 50% of the fibers found in cat muscles are fast-twitch fatiguable. Capillary-to-fiber ratios are 2.40to 2.97 for dog muscles compared to 2.17 to 2.84 for cat muscles. Thus the 2- to 3-fold higher Q at VO2max for dog muscles compared to cat muscles is not due to a greater number of capillaries.

AB - The purpose was to determine if physiological characteristics of skeletal muscles of dogs and cats are related to their histochemical and biochemical characteristics. Maximum oxygen conumption (VO2max) and blood flow (Q) at VO2max were determined for in situ muscles of dogs and cats. Compared to cat muscles, dog muscles per unit mass had higher succinate oxidase activities, VO2max's, and Q's at VO2max's. There are positive relationships between Q at VO2 max and VO2max and between VO2max and succinate oxidase activity. The higher VO2max's and succinate oxidase activities of dog muscles are consistent with the presence in these muscles of only slow-twitch fatigue-resistant fibers and fast-twitch fatigue-resistant fibers, whereas up to 50% of the fibers found in cat muscles are fast-twitch fatiguable. Capillary-to-fiber ratios are 2.40to 2.97 for dog muscles compared to 2.17 to 2.84 for cat muscles. Thus the 2- to 3-fold higher Q at VO2max for dog muscles compared to cat muscles is not due to a greater number of capillaries.

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Physiological characteristics of skeletal muscles of dogs and cats

Abstract

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