References
- Cavagna , GA . 1975 . Force platforms as ergometers . J Appl Physiol , 39 : 174 – 179 .
- Cavagna , GA , Franzetti , P , Heglund , NC and Willems , P . 1988 . The determinants of step frequency in running, trotting and hopping in man and other vertebrates . J Physiol (London) , 399 : 81 – 92 .
- Heglund , NC , Cavagna , GA and Taylor , CR . 1981 . Energetics and mechanics of terrestrial locomotion III. Energy changes of the centre of mass as a function of speed and body size in birds and mammals . J Exp Biol , 97 ( 1 ) : 41 – 56 .