1. Biology Department, Duke University, Durham, NC 27708, USA
2. Biomechanics Laboratory, Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
3. The Department of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
4. Integrative and Biomedical Physiology, The Pennsylvania State University, University Park, PA 16802, USA
5. Department of Kinesiology, The University of Massachusetts, Amherst, Amherst, MA 01003, USA