Research Topics | T J RobertsSummaryAffiliation: Oregon State University Country: USA Publications
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Detail Information
Publications
Energetics of bipedal running. I. Metabolic cost of generating forceT J Roberts
Harvard University, Museum of Comparative Zoology, Concord Field Station, Old Causeway Road, Bedford, MA 01730, USA
J Exp Biol 201:2745-51. 1998....- Mechanical power output during running accelerations in wild turkeysThomas J Roberts
Department of Zoology, Oregon State University, 3029 Cordley Hall, Corvallis, OR 97331 2914, USA
J Exp Biol 205:1485-94. 2002.... - The integrated function of muscles and tendons during locomotionThomas J Roberts
Oregon State University, Department of Zoology, 3029 Cordley Hall, Corvallis, OR 97331 2914, USA
Comp Biochem Physiol A Mol Integr Physiol 133:1087-99. 2002..Tendon elastic energy storage and recovery extends the functional range of muscles by uncoupling the pattern of muscle fiber shortening from the pattern of movement of the body... - Probing the limits to muscle-powered accelerations: lessons from jumping bullfrogsThomas J Roberts
Biology Department, Northeastern University, 414 Mugar, 360 Huntington Ave, Boston, MA 02115, USA
J Exp Biol 206:2567-80. 2003..These results can explain the high power outputs observed in jumping frogs. More generally, our model suggests how the function of non-muscular elements of the musculoskeletal system enhances performance in muscle-powered accelerations... - Muscle and tendon contributions to force, work, and elastic energy savings: a comparative perspectiveA A Biewener
Department of Organismic and Evolutionary Biology, Harvard University, Bedford, Massachusetts 01730, USA
Exerc Sport Sci Rev 28:99-107. 2000..Isometric or eccentric contractions enhance force and further reduce energy cost. However, elastic savings is probably constrained by the need to reduce compliance for accurate control of position... - Relative shortening velocity in locomotor muscles: turkey ankle extensors operate at low V/V(max)Annette M Gabaldón
Oregon State University, Department of Zoology, Corvallis, OR, USA
Am J Physiol Regul Integr Comp Physiol 294:R200-10. 2008..This observation is consistent with the idea that V/V(max) is an important determinant of locomotor cost because it affects the volume of muscle that must be recruited to support body weight... - Muscle strain is modulated more with running slope than speed in wild turkey knee and hip extensorsThomas J Roberts
Brown University, Ecology and Evolutionary Biology Department, Box GB205, Providence, RI 02912, USA
J Exp Biol 210:2510-7. 2007..Taken together, the speed and slope results suggest that the demand for mechanical work is an important determinant of muscle length patterns in running and walking... - Sources of mechanical power for uphill running in humansThomas J Roberts
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA
J Exp Biol 208:1963-70. 2005..The increase in hip moment with running incline allows for the production of the power necessary to lift the body. This power may be developed by hip extensors or by transfer of power from muscles at other joints via biarticular muscles... - Adjusting muscle function to demand: joint work during acceleration in wild turkeysThomas J Roberts
Oregon State University, Department of Zoology, 3029 Cordley Hall, Corvallis, OR 97331 2914, USA
J Exp Biol 207:4165-74. 2004..These patterns of joint moment and excursion indicate that turkeys increase mechanical work for acceleration primarily by increasing muscle shortening, rather than muscle force... - Muscle mechanical advantage of human walking and running: implications for energy costAndrew A Biewener
Concord Field Station, Dept of Organismic and Evolutionary Biology, Harvard University, Bedford, MA 01730, USA
J Appl Physiol 97:2266-74. 2004..The low mechanical advantage in running humans may also explain previous observations of a greater metabolic cost of transport for running humans compared with trotting and galloping quadrupeds of similar size... - Mechanical function of two ankle extensors in wild turkeys: shifts from energy production to energy absorption during incline versus decline runningAnnette M Gabaldón
Department of Zoology, Oregon State University, 3029 Cordley Hall, Corvallis, OR 97331, USA
J Exp Biol 207:2277-88. 2004..Our results show that the changing demands for whole body work during steady speed running are met, at least in part, by an ability of single muscles to shift mechanical function from net energy production to net energy absorption... - Force-velocity properties of two avian hindlimb musclesFrank E Nelson
Zoology Institute, Oregon State University, 3029 Cordley Hall, Corvallis, OR 97331 2914, USA
Comp Biochem Physiol A Mol Integr Physiol 137:711-21. 2004..The force-velocity properties of turkey LG and PL muscle do not reveal any extreme differences in the mechanical potential between avian and other vertebrate muscle... - Metabolic cost of generating muscular force in human walking: insights from load-carrying and speed experimentsTimothy M Griffin
Department of Integrative Biology, University of California, Berkley, California 94720, USA
J Appl Physiol 95:172-83. 2003..11 +/- 0.03 (SD) J/cm3]. These data indicate that, regardless of the work muscles do, the metabolic cost of walking can be largely explained by the cost of generating muscular force during the stance phase... 
Task-dependent force sharing between muscle synergists during locomotion in turkeysFrank E Nelson
Ecology and Evolutionary Biology Department, Brown University, Box GB205, Providence, RI 02912, USA
J Exp Biol 211:1211-20. 2008..Thus, the LG produced all of the force required for limb extension during swing. This change in the pattern of force sharing between stance and swing supports the theory that force sharing between muscle synergists is task-dependent...
Variable gearing in pennate musclesEmanuel Azizi
Department of Ecology and Evolutionary Biology, Brown University, Providence, RI 02912, USA
Proc Natl Acad Sci U S A 105:1745-50. 2008..These results suggest that variable gearing in pennate muscles provides a mechanism to modulate muscle performance during mechanically diverse functions...