在迁徙鸟中,在可变的湿度条件下长途飞行后,飞行肌肉的大小减少和功能变化
Derrick J E Groom1,2, Betsy Black1, Jessica E Deakin3
1Department of Biology, University of Massachusetts Amherst, Massachusetts, USA.
Physiological reports
|October 18, 2023
概括
迁徙鸟类在飞行期间保持肌肉功能,尽管体重减少. 脱水会减缓肌肉运动,但有氧能力和力量产生在很大程度上保持不变.
科学领域:
- 生理学 生理学 生理学
- 动物迁徙 动物迁徙
- 肌肉生物学 肌肉生物学
背景情况:
- 鸟类的飞行肌肉可以在迁徙期间由于蛋白质代谢而失去大量的质量.
- 脱水可以加剧瘦肉质量损失和鸟类的蛋白质代谢.
- 运动诱导的蛋白质代谢对迁移期间肌肉性能的功能影响尚不清楚.
研究的目的:
- 为了研究长时间飞行和脱水条件对鸟类飞行肌肉的功能影响.
- 测试飞行和脱水会减少肌肉质量,有氧能力和收缩能力的假设.
主要方法:
- 在休息或飞行期间,黄鸟在干燥或潮湿的条件下进行了6小时的研究.
- 胸部肌肉的收缩性和有氧新陈代谢的酶能力被分析.
- 在飞行/休息后立即收集肌肉样本,并在恢复后24小时后收集肌肉样本.
主要成果:
- 由于飞行或湿度,没有观察到脂质代谢或肌肉力量生成的显著变化.
- 胸部肌肉干质量的减少发生在飞行后立即.
- 与潮湿条件相比,在干燥条件下,肌酸氨酸-动因交桥动力学减缓.
结论:
- 鸟类的飞行肌肉在很大程度上保留了6小时的运动后的有氧和收缩功能.
- 迁徙鸟类似乎保持了重要的能量通路和肌肉功能,尽管生理上的压力.
- 环境湿度会影响肌肉动力学,但整体功能在迁徙飞行期间是有弹性的.
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