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首页> 外文期刊>The Journal of Experimental Biology >Joint work and power associated with acceleration and deceleration in tammar wallabies (Macropus eugenii)
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Joint work and power associated with acceleration and deceleration in tammar wallabies (Macropus eugenii)

机译：与淡淡小袋鼠（Macropus eugenii）的加速和减速相关的联合功和动力

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Measurements of joint work and power were determined using inverse dynamics analysis based on ground reaction force and high-speed video recordings of tammar wallabies as they decelerated and accelerated while hopping over a force platform on level ground. Measurements were obtained over a range of accelerations ranging from -6 m s(-2) to 8 m s(-2). The goal of our study was to determine which joints are used to modulate mechanical power when tammar wallabies change speed. From these measurements, we also sought to determine which hind limb muscle groups are the most important for producing changes in mechanical work. Because our previous in vivo analyses of wallaby distal muscle function indicated that these muscle-tendon units favor elastic energy savings and perform little work during steady level and incline hopping, we hypothesized that proximal muscle groups operating at the hip and knee joint are most important for the modulation of mechanical work and power. Of the four hind limb joints examined, the ankle joint had the greatest influence on the total limb work, accounting for 89% of the variation observed with changing speed. The hip and metatarsophalageal (MP) joints also contributed to modulating whole limb work, but to a lesser degree than the ankle, accounting for 28% (energy production) and -24% (energy absorption) of the change in whole limb work versus acceleration, respectively. In contrast, the work produced at the knee joint was independent of acceleration. Based on the results of our previous in vivo studies and given that the magnitude of power produced at the ankle exceeds that which these muscles alone could produce, we conclude that the majority of power produced at the ankle joint is likely transferred from the hip and knee joints via proximal bi-articular muscles, operating in tandem with bi-articular ankle extensors, to power changes in hopping speed of tammar wallabies. Additionally, over the observed range of performance, peak joint moments at the ankle (and resulting tendon strains) did not increase significantly with acceleration, indicating that having thin tendons favoring elastic energy storage does not necessarily limit a tammar wallaby's ability to accelerate or decelerate.
机译：联合功和功率的测量是基于地面反作用力和反刍动物的高速视频记录，基于反作用力分析而确定的，它们在跳到水平地面上的力平台时减速和加速。在-6 m s（-2）到8 m s（-2）的加速度范围内获得了测量值。我们的研究目标是确定当泰米尔小袋鼠改变速度时，哪些关节用于调节机械动力。从这些测量中，我们还试图确定哪些后肢肌肉群对于产生机械功的变化最重要。因为我们先前对袋鼠远端肌肉功能的体内分析表明，这些肌腱单位有利于节省弹性能量，并且在稳定水平运动和倾斜跳跃过程中几乎不起作用，因此我们假设在髋关节和膝关节工作的近端肌肉群对于机械功和功率的调制。在检查的四个后肢关节中，踝关节对整个肢体工作的影响最大，占随速度变化观察到的变化的89％。髋关节和meta骨（MP）关节也有助于调节整个肢体工作，但程度不及踝关节，占整个肢体工作与加速变化的28％（能量产生）和-24％（能量吸收） ， 分别。相反，膝关节产生的功与加速度无关。根据我们先前的体内研究结果，并考虑到脚踝产生的力量超过了这些肌肉单独产生的力量，我们得出的结论是，脚踝关节产生的大部分力量可能是从臀部和膝盖转移的通过近端双关节肌肉与双关节踝伸肌连在一起进行关节运动，以增强淡色小袋鼠的跳跃速度。此外，在观察到的性能范围内，脚踝处的峰值关节力矩（以及由此产生的肌腱应变）并未随加速而显着增加，表明具有有助于弹性能量存储的细肌腱并不一定会限制坦玛鼠的加速或减速能力。

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