What triggers the aerobic dive limit? Patterns of muscle oxygen depletion during dives of emperor penguins
What triggers the aerobic dive limit? Patterns of muscle oxygen depletion during dives of emperor penguins
复制标题
是什么触发了有氧潜水极限？
DOI：
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发表时间：
2010
影响因子：
2.8
通讯作者：
P. Ponganis
中科院分区：
文献类型：
--
作者：
Cassondra L. Williams;J. Meir;P. Ponganis
总结有氧潜水极限（ADL）的生理基础，潜水持续时间与潜水后血乳酸升高的发病相关，被假设为肌肉氧（O2）储存的耗尽。采用双波长近红外分光光度计测量了帝企鹅（Aptenodytesforsteri）潜水过程中运动肌肌红蛋白（Mb）O2饱和度的变化。观察到两种不同的肌肉O2耗竭模式。A型潜水有一个单调的下降，并在附近的ADL潜水，肌肉O2存储几乎完全耗尽。这种肌红蛋白饱和度下降的模式与缺乏肌肉血流量是一致的，并支持这一假设，即潜水后血乳酸积累的发病是继发于肌肉氧在潜水过程中耗尽。平均A型肌红蛋白去饱和率允许计算的平均肌肉O2消耗量为12.4毫升O2 kg-1肌肉min-1，根据肌红蛋白浓度为6.4克100克-1肌肉。B型减饱和模式表现出更渐进的下降，通常在MB型减饱和中达到潜水中期平台。这种潜水中期平台表明在这些潜水过程中维持了一些肌肉灌注。在B型潜水结束时，MB b去饱和率增加，在超过ADL的潜水中，MB b饱和度通常接近于0%。因此，虽然不同的生理策略，可能会使用帝企鹅潜水，肌红蛋白去饱和模式支持这一假设，即发病后潜水乳酸积累是次要的肌肉O2存储耗尽。
SUMMARY The physiological basis of the aerobic dive limit (ADL), the dive duration associated with the onset of post-dive blood lactate elevation, is hypothesized to be depletion of the muscle oxygen (O2) store. A dual wavelength near-infrared spectrophotometer was developed and used to measure myoglobin (Mb) O2 saturation levels in the locomotory muscle during dives of emperor penguins (Aptenodytes forsteri). Two distinct patterns of muscle O2 depletion were observed. Type A dives had a monotonic decline, and, in dives near the ADL, the muscle O2 store was almost completely depleted. This pattern of Mb desaturation was consistent with lack of muscle blood flow and supports the hypothesis that the onset of post-dive blood lactate accumulation is secondary to muscle O2 depletion during dives. The mean type A Mb desaturation rate allowed for calculation of a mean muscle O2 consumption of 12.4 ml O2 kg–1 muscle min–1, based on a Mb concentration of 6.4 g 100 g–1 muscle. Type B desaturation patterns demonstrated a more gradual decline, often reaching a mid-dive plateau in Mb desaturation. This mid-dive plateau suggests maintenance of some muscle perfusion during these dives. At the end of type B dives, Mb desaturation rate increased and, in dives beyond the ADL, Mb saturation often reached near 0%. Thus, although different physiological strategies may be used during emperor penguin diving, both Mb desaturation patterns support the hypothesis that the onset of post-dive lactate accumulation is secondary to muscle O2 store depletion.
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影响因子：
15.9
作者：
RICHARDSON, RS;NOYSZEWSKI, EA;WAGNER, PD
通讯作者：
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影响因子：
37.8
作者：
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DOI：
10.1016/0034-5687(85)90074-x
发表时间：
1985
期刊：
Respiration physiology
影响因子：
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作者：
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DOI：
10.1242/jeb.204.22.3877
发表时间：
2001
期刊：
The Journal of experimental biology
影响因子：
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作者：
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Kooyman,GL
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DOI：
10.1016/s0034-5687(97)84031-5
发表时间：
1997
期刊：
Respiration physiology
影响因子：
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作者：
Ponganis,PJ;Costello,ML;Starke,LN;Mathieu-Costello,O;Kooyman,GL
通讯作者：
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