Marsh R L, John-Alder H B
Department of Biology, Northeastern University, Boston 02115.
J Exp Biol. 1994 Mar;188:131-41. doi: 10.1242/jeb.188.1.131.
Jumping performance at 20 degrees C was assessed in five species of hylid frogs using high-speed cine film. Mean takeoff velocities (Vt) varied from 1.5 to 2.4 ms-1 among the species. Peak Vt varied from 1.9 to 2.9 ms-1. Body-mass-specific power output averaged over the entire takeoff period varied from 29 to 91 W kg-1 during the jumps with the highest takeoff velocities. These values are similar to those predicted from jumping distance. As the mass of muscles available to power the jump probably amounts to no more than 17% of the body mass, average muscle-mass-specific power can be over 500 W kg-1. The performance during jumping is even more impressive in view of the fact that the peak power during takeoff is about twice the average power. These frogs must use elastic storage to redistribute power during takeoff to produce the peak power required and may use pre-storage of elastic energy to boost the average power available.
利用高速电影胶片对5种雨蛙属青蛙在20摄氏度时的跳跃性能进行了评估。在这些物种中，平均起跳速度（Vt）在1.5至2.4米/秒之间变化。峰值Vt在1.9至2.9米/秒之间变化。在起跳速度最高的跳跃过程中，整个起跳阶段的体重比功率输出平均在29至91瓦/千克之间。这些值与根据跳跃距离预测的值相似。由于用于驱动跳跃的可用肌肉质量可能不超过体重的17%，平均肌肉质量比功率可超过500瓦/千克。鉴于起跳时的峰值功率约为平均功率的两倍，跳跃过程中的表现更加令人印象深刻。这些青蛙在起跳时必须利用弹性储能来重新分配功率，以产生所需的峰值功率，并且可能利用弹性势能的预存储来提高可用的平均功率。
