Physiological characteristics of skeletal muscles of dogs and cats.
Physiological characteristics of skeletal muscles of dogs and cats.
复制标题
狗和猫骨骼肌的生理特征。
DOI：
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发表时间：
1977
影响因子：
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通讯作者：
J. Faulkner
中科院分区：
文献类型：
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作者：
L. Maxwell;J. K. Barclay;D. Mohrman;J. Faulkner
我们的目的是确定狗和猫骨骼肌的生理特征是否与其组织化学和生化特征相关。确定狗和猫的原位肌肉的最大耗氧量 (VO2max) 和 VO2max 时的血流量 (Q)。与猫的肌肉相比，每单位质量的狗肌肉具有更高的琥珀酸氧化酶活性、最大摄氧量和最大摄氧量时的Q。最大摄氧量 Q 与最大摄氧量之间以及最大摄氧量与琥珀酸氧化酶活性之间存在正相关关系。狗肌肉较高的最大摄氧量和琥珀酸氧化酶活性与这些肌肉中仅存在慢肌抗疲劳纤维和快肌抗疲劳纤维一致，而猫肌肉中高达 50% 的纤维是快肌可疲劳纤维。狗肌肉的毛细血管与纤维的比率为 2.40-2.97，而猫肌肉的毛细血管与纤维的比率为 2.17-2.84。因此，与猫肌肉相比，狗肌肉的最大摄氧量 Q 值高出两到三倍，这并不是因为毛细血管数量较多。
Our purpose was to determine if physiological characteristics of skeletal muscles of dogs and cats are related to their histochemical and biochemical characteristics. Maximum oxygen consumption (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 VO2max 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 fatique-resistant fibers and fast-twitch fatique-resistant fibers, whereas up to 50% of the fibers found in cat muscles are fast-twitch fatiqable. Capillary-to-fiber ratios are 2.40-2.97 for dog muscles compared to 2.17-2.84 for cat muscles. Thus the two- to threefold higher Q at VO2max for dog muscles compared to cat muscles is not due to a greater number of capillaries.