Department Adaptations du Vivant, UMR MECADEV 7179 Sorbonne Universités-MNHN-UPMC-CNRS-IRD, Muséum National d'Histoire Naturelle, CP55 57 rue Cuvier, 75231, Paris Cedex05, France.
J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2018 Jun;204(6):537-547. doi: 10.1007/s00359-018-1256-2. Epub 2018 Apr 2.
The gaits of the adult grey mouse lemur Microcebus murinus were studied during treadmill locomotion over a large range of velocities. The locomotion sequences were analysed to determine the gait and the various spatiotemporal gait parameters of the limbs. We found that velocity adjustments are accounted for differently by stride frequency and stride length depending on whether the animal showed a symmetrical or an asymmetrical gait. When using symmetrical gaits the increase in velocity is associated with a constant contribution of the stride length and stride frequency; the increase of the stride frequency being always lower. When using asymmetrical gaits, the increase in velocity is mainly assured by an increase in the stride length which tends to decrease with increasing velocity. A reduction in both stance time and swing time contributed to the increase in stride frequency for both gaits, though with a major contribution from the decrease in stance time. The pattern of locomotion obtained in a normal young adult mouse lemurs can be used as a template for studying locomotor control deficits during aging or in different environments such as arboreal ones which likely modify the kinematics of locomotion.
成年灰鼠狐猴 Microcebus murinus 的步态在跑步机上进行了大范围速度的运动研究。对运动序列进行了分析，以确定四肢的步态和各种时空步态参数。我们发现，速度的调整因动物是否表现出对称或不对称步态而有所不同，这取决于步频和步长的作用。当使用对称步态时，速度的增加与步长和步频的恒定贡献有关；步频的增加总是较低。当使用不对称步态时，速度的增加主要由步长的增加来保证，而步长随着速度的增加而趋于减小。对于两种步态，支撑时间和摆动时间的减少都有助于增加步频，尽管主要是由支撑时间的减少造成的。在正常年轻成年鼠狐猴中获得的运动模式可作为模板，用于研究衰老期间或在不同环境（例如可能改变运动运动学的树木环境）中的运动控制缺陷。
