Laboratory of Evolutionary Physiology and Behaviour, Chongqing Key Laboratory of Animal Biology, Chongqing Normal University, Chongqing, 400047, China.
Fish Physiol Biochem. 2012 Oct;38(5):1367-77. doi: 10.1007/s10695-012-9624-2. Epub 2012 Feb 29.
To investigate the effects of hypoxia acclimation, exercise training and fasting on the swimming performance of juvenile qingbo (Spinibarbus sinensis), we measured the critical swimming speed (U (crit)), resting and excess post-exercise oxygen consumption (EPOC) of control, hypoxia-acclimated, exercise-acclimated and fasting fish at 25°C. The muscle and plasma metabolites before and after a bout of exhaustive exercise (produced by chasing) were also measured. The fish were acclimated to hypoxia (48 h at 1.0 mg L(-1), 12.5% air saturation), exercise training (2 weeks at 60% of U (crit), 6 h daily) or fasting (2 weeks). All treatments resulted in significantly lower resting oxygen consumption ([Formula: see text]O(2rest)) but had no effect on the magnitude of EPOC. Hypoxia acclimation had no effect on U (crit) or peak post-exercise oxygen consumption ([Formula: see text]O(2peak)) but produced a higher depletion of muscle [glycogen] post-chasing (P < 0.05). Exercise training produced a significant increase in U (crit), higher liver [glycogen] pre-chasing and higher depletion of muscle [glycogen] post-chasing. Fasting resulted in a significant decrease in U (crit), [Formula: see text]O(2peak), muscle and liver [glycogen]. These results suggested that hypoxia acclimation had no effect on swimming performance in qingbo. Exercise training produced improved swimming performance by increasing the stored energy and the metabolic capacity of muscle. Fasting had a profound effect on swimming performance through both decreased respiratory capacity and a depleted energy store.
为了研究低氧适应、运动训练和禁食对青波（Spinibarbus sinensis）幼鱼游泳性能的影响，我们在 25°C 下测量了对照组、低氧适应组、运动适应组和禁食组幼鱼的临界游泳速度（U(crit)）、静止时耗氧量和运动后过量耗氧量（EPOC）。我们还测量了剧烈运动（通过追逐产生）前后肌肉和血浆代谢物。鱼分别在低氧（1.0mg/L，12.5%空气饱和度，48 小时）、运动训练（60%U(crit)，6 小时/天，2 周）或禁食（2 周）条件下进行适应。所有处理均显著降低了静止时耗氧量（[Formula: see text]O(2rest)），但对 EPOC 幅度没有影响。低氧适应对 U(crit)或运动后峰值耗氧量（[Formula: see text]O(2peak)）没有影响，但追逐后肌肉[糖原]的耗竭量更高（P<0.05）。运动训练显著提高了 U(crit)、肝[糖原]的预追逐值和肌肉[糖原]的后追逐耗竭量。禁食导致 U(crit)、[Formula: see text]O(2peak)、肌肉和肝[糖原]显著下降。这些结果表明，低氧适应对青波的游泳性能没有影响。运动训练通过增加肌肉的储能和代谢能力提高了游泳性能。禁食通过降低呼吸能力和耗尽能量储备对游泳性能产生了深远的影响。
