Post-activation muscle potentiation and its relevance to cyclical behaviours.
Post-activation muscle potentiation and its relevance to cyclical behaviours.
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激活后肌肉增强及其与周期性行为的相关性。
DOI：
10.1098/rsbl.2020.0255
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发表时间：
2020
期刊：
影响因子：
3.3
通讯作者：
Biewener,AndrewA
中科院分区：
文献类型：
--
作者：
Taylor-Burt,KariR;Konow,Nicolai;Biewener,AndrewA
肌肉可以经历激活后增强（PAP），当收缩时间紧密时，力量和力量发展速度的暂时增加；因此，周期性行为可能受到PAP的影响，因为连续的收缩周期可能导致随后几个周期的增强。在这里，我们检查了野鸭侧腓肠肌（LG）的周期性收缩期间的PAP。水面游泳是一种循环行为，使用vivoLG长度变化和刺激参数来模拟工作循环。测试在绿头鸭喜欢的循环频率以及较低和较高的频率下进行。与哺乳动物、无尾动物和节肢动物的肌肉一样，绿头鸭的肌肉也表现出PAP，其峰值力、平均力率和净功都有所增加。阶梯增强发生在两个或更多的工作循环中，导致PAP逐渐增加。达到最大工作所需的循环次数随循环频率的变化而变化，在更高的循环频率下需要更多的循环。PAP在类体内刺激参数下发生，表明PAP在动物运动中，特别是在循环行为中可能发挥重要作用。
Muscle can experience post-activation potentiation (PAP), a temporary increase in force and rate of force development, when contractions are closely timed; therefore, cyclical behaviours are likely affected by PAP, as succeeding contraction cycles can lead to potentiation over several subsequent cycles. Here, we examined PAP duringin situcyclical contractions of the mallard lateral gastrocnemius (LG). Surface swimming, a cyclical behaviour, was mimicked with work-loops usingin vivoLG length change and stimulation parameters. Tests were performed at mallards' preferred cycle frequency as well as at lower and higher frequencies. Like muscles from mammals, anurans and arthropods, the mallard LG exhibited PAP with increases in peak force, average force rate and net work. Staircase potentiation occurred over two or more work-loop cycles, resulting in gradual increases in PAP. The number of cycles needed to reach maximum work varied with cycle frequency, requiring more cycles at higher cycle frequencies. PAP occurred underin vivo-like stimulation parameters, suggesting a potentially important role of PAP in animal locomotion, especially in cyclical behaviours.