Department: Comparative Biomedical Sciences
Research Centres: Structure & Motion Laboratory
Chris studies the evolution of the frog musculo-skeletal system using a combination of experimental, modeling and robotic tools. More broadly, his group is interested in linking nero-muscular function to biomechanical performance. There is currently a phd studentship position open (bio-robotics), co-advised by myself and Dr. Monica Daley - please apply online if interested or email me with any questions. Read more about paleo-robotics.
Chris holds degrees in Biology and Violin Performance (Oberlin College & Conservatory, OH, USA). In 2009 he earned a PhD at the Concord Field Station under the supervision of Andrew Biewener in 2009 (Harvard University, MA, USA). From 2009 to 2014 Chris established the Propulsion Physiology Lab under a Jr. Fellowship at the Rowland Institute (Harvard).He joined the Structure and Motion Laboratory as a Research Fellow in March, 2014.
My team seeks to understand the physiological basis for how limbs move to power locomotion.
The fundamental question we ask is: How do muscle tissue properties influence the structure-function relationship of vertebrate limbs? Specifically, we focus on three fundamental limb properties:
- muscle function (intrinsic speed and strength)
- skeletal structure
- limb external morphology
Although traditional approaches address these properties in isolation of one another, they are all interdependent. For example over the course of evolution, if an animal transitions from water to land, we expect that the muscle properties must also change in concert with morphological shifts. Furthermore, we expect that the internal skeletal structure (e.g. the length of bones or bony processes) would also adapt. Hence, we attempt to understand how muscle properties, limb internal anatomy and external anatomy are 'tuned' to one another to confer effective locomotion. We address our questions using frogs as model systems.
Under a recent grant from the European Research Council, my group will investigate how evolutionary transformations of the frog hind limb and pelvis resulted in spectacular diversification of locomotor behaviour. Specifically, we will use muscle-powered robotic limb models to 're-animate' fossil frogs in search of general design principles that govern the multi-functionality of vertebrate limbs.
Clemente, C.J., Richards, C.T. (2013). Muscle power limits speed: muscle function and hydrodynamics constrains power in swimming frogs, Nature Communications 4, 2737, doi:10.1038/ncomms3737
Richards, C.T., Clemente, C.J. (2013). Built for rowing: frog muscle is tuned to limb morphology to power swimming. Journal of the Royal Society Interface, 10, 20130236
Richards, C.T., Sawicki, G.S. (2012). Elastic recoil can either amplify or attenuate muscle–tendon power,depending on inertial vs. ?uid dynamic loading. Journal of Theoretical biology, 313, 68-78
Clemente, C.J., Richards, C.T. (2012). Determining the in?uence of muscle operating length on muscle performance during frog swimming using a bio-robotic model. Bioinspiration & Biomimetics, 7, 036018
Richards, C.T., Clemente, C.J. (2012). A bio-robotic platform for integrating internal and external mechanics during muscle-powered swimming. Bioinspiration & Biomimetics, 7, 016010
Richards, C.T., (2011). Building a robotic link between muscle dynamics and hydrodynamics. Journal of Experimental Biology, 214, 2381-2389
Richards, C.T., (2010). Kinematics and hydrodynamics analysis of swimming anurans reveals striking inter-specific differences in the mechanism for producing thrust. Journal of Experimental Biology, 213, 621-634
Richards, C.T., (2008). The kinematic determinants of anuran swimming performance: an inverse and forward dynamics approach. Journal of Experimental Biology, 211, 3181-3194
Richards, C.T., Biewener, A.A. (2007). Modulation of in vivo muscle power output during swimming in the African clawed frog (Xenopus laevis). Journal of Experimental Biology, 210, 3147-3159