Los héroes disecados de Mario Bellatin

En este ensayo se analiza la figura de los perros dentro del universo narrativo y biográfico del escritor mexicano Mario Bellatin (1960), específicamente en la novela Perros héroes (2006). Incorporando material encontrado en entrevistas y otras publicaciones del autor, se propone entender la presencia perruna como una puesta en cuestión de la superioridad del hombre por sobre el animal. Además, este análisis se complementa al ponerlo en directa vinculación con otras desarticulaciones importantes dentro de este proyecto escritural: de las maneras tradicionales de narrar, de la identidad de los sujetos, de la separación autor/obra, de los límites entre distintas disciplinas artísticas, entre otras

MUSCLE CONTRIBUTIONS TO BODY MASS CENTER VELOCITY DURING VERTICAL AND FORWARD JUMPING

The purpose of this study was to quantify the horizontal and vertical velocities of the body mass center produced by the lower limb muscles during vertical and forward jumps. Vertical and forward jumps were simulated using a model of the musculoskeletal system consisting of four rigid segments actuated by six leg muscles. It was found that most of the vertical velocity of the body mass center was produced by the soleus and gastrocnemius in both jump conditions. The horizontal velocity at take-off was larger for the forward jump, caused by a larger forward velocity produced by the hamstrings, soleus, and gastrocnemius and a smaller backward velocity produced by the vasti and rectus femoris. The force development patterns were different only in the hamstrings and rectus femoris, indicating that these bi-articular muscles may play an important role in the control of jumping direction