Ground reaction forces and center of mass mechanics of bipedal capuchin monkeys: Implications for the evolution of human bipedalism

摘要: Tufted capuchin monkeys are known to use both quadrupedalism and bipedalism in their natural environments. Although previous studies have investi- gated limb kinematics metabolic costs, ground reaction forces (GRFs) center of mass (CoM) mechan- ics during two four-legged locomotion unknown. Here, we determine the hind GRFs CoM energy, work, power over a range speeds gaits investigate effect differential number on locomotor performance. Our results indicate that ''grounded run'' (0.83-1.43 ms 21 ) primarily ambling galloping (0.91- 6.0 ). energy recoveries quite low (2-17%), general higher quadru- pedalism (4-72%). Consistent with this, vertical as well power, collisional losses than quadrupedalism. The posi- tive work is 2.04 6 0.40 Jkg m (bipedalism) 0.70 0.29 (quadrupedalism), which within published values for terrestrial animals. this study confirm facultative capuchins other nonhuman primates need not be restricted pendulum-like walking gait, but rather can include running, albeit without an aer- ial phase. Based these similar bipeds, suggest important transi- tions evolution hominin performance were emergences obligate, walk- ing gait bouncy running included whole- body aerial Am J Phys Anthropol 150:76-86, 2013. V C 2012 Wiley Periodicals, Inc.