LOCOMOTOR ONTOGENY OF PRIMATE QUADRAPEDALISM AND THE EVOLUTION OF PRIMATE GAIT

本子项目是利用由NIH/NCRR资助的中心赠款提供的资源的众多研究子项目之一。子项目和研究者（PI）可能已经从另一个NIH来源获得了主要资金，因此可以在其他CRISP条目中表示。列出的机构是中心的，不一定是研究者的机构。体重和体型的变化可能会影响狒狒生命前6个月四条腿行走行为变化的生物力学。婴儿在身体步态和运动方面从“横向序列”（手臂在同侧腿后触地）步态转变为“对角线序列”（手臂在对侧腿后触地）步态。这是一个重要的转变，因为成年灵长类动物的对角序列步态在哺乳动物中是独一无二的，而且关于它为什么进化还没有达成共识。这个项目将解决这个问题。行走的生物力学将在4至26周龄的婴儿狒狒中进行评估。反射标记将被放置在四肢上，运动将被3D运动分析系统和摄像机记录下来。小重量将被放置在身体的各个部分，以测试步态随着体重分布的变化而变化。我们支持基金会的初步工作，以证明可行性并收集试点数据。从利基基金会获得了资金，并在奥斯汀建立了一个实验室来继续这项工作。我们把幼狒狒租给研究项目。这个项目正在进行中。本研究的结论将有助于揭示灵长类动物行走运动的进化，并有助于确定可能导致灵长类动物对角序列步态进化的身体结构变化。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Changes in body weight and shape may influence the biomechanics of change in four leg walking behavior during the first 6 months of baboon life. Infants change from a ¿lateral sequence¿ (arm touches down after ipsilateral leg) gait to a ¿diagonal sequence¿ (arm touches down after contralateral leg) gait, in terms of body gait and motion. This is an important transition because the diagonal sequence gait in adult primates is unique among mammals, and there is no consensus on why it evolved. This project will address that question. Biomechanics of walking will be assessed in infant baboons between 4 and 26 weeks old age. Reflective markers will be placed on limbs and motion will be recorded with a 3D motion analysis system in conjunction with a video camera. Small weights will be placed on body segments to test for changes in gait with changes in body weight distribution. We supported initial work at the Foundation to demonstrate feasibility and gather pilot date. Funding was obtained from the Leakey Foundation and a laboratory was established in Austin to continue the work. We lease infant/juvenile baboons to the research program. This project is underway. The conclusion of this study will shed light on the evolution of walking motion in primates and will help identify the changes in body structure that might have led to the evolution of diagonal sequence gait in primates.