Tu ULPGC N.8. Septiembre 2009

Editorial: La gestión del personal docente e investigador. Actualidad institucional: Llegan más de 600 estudiantes de intercambio 1.616 Profesores e investigadores para cubrir la docencia universitaria. La ULPGC facilita información a los representantes de la comunidad universitaria sobre la Gripe A. La ULPGC impartirá Enfermería en Fuerteventura. Concurso de emprendedores Universitarios. Reportaje: Acto de Apertura del Curso Académico 2009-2010. La ULPGC investiga: Mención Especial de Honor en un concurso internacional de Arquitectura. Descubren un corredor de remolinos oceánicos en Canarias. Los científicos desarrollan una terapia que frena el Lupus en ratones. Comunidad universitaria: Ayudas para la mejora de la Gestión Ambiental y la Sostenibilidad. III Olimpiada Iberoamericana de Biología. Campeonas de Europa en el Universitario de Kárate

Muscular development and physical activity as major determinants of femoral bone mass acquisition during growth

[EN] OBJECTIVES: To investigate to what extent bone mass accrual is determined by physical activity and changes in lean, fat, and total body mass during growth. METHODS: Twenty six physically active and 16 age matched control boys were followed up for three years. All subjects were prepubertal at the start of the survey (mean (SEM) age 9.4 (0.3) years). The weekly physical activity of the active boys included compulsory physical education sessions (80-90 minutes a week), three hours a week of extracurricular sports participation, and occasional sports competitions at weekends. The physical activity of the control group was limited to the compulsory physical education curriculum. Bone mineral content (BMC) and areal density (BMD), lean mass, and fat mass were measured by dual energy x ray absorptiometry. RESULTS: The effect of sports participation on femoral bone mass accrual was remarkable. Femoral BMC and BMD increased twice as much in the active group as in the controls over the three year period (p < 0.05). The greatest correlation was found between the increment in femoral bone mass and the increment in lean mass (BMC r = 0.67 and BMD r = 0.69, both p < 0.001). Multiple regression analysis revealed enhancement in lean mass as the best predictor of the increment in femoral bone BMC (R = 0.65) and BMD (R = 0.69). CONCLUSIONS: Long term sports participation during early adolescence results in greater accrual of bone mass. Enhancement of lean mass seems to be the best predictor of this bone mass accumulation. However, for a given muscle mass, a greater level of physical activity is associated with greater bone mass and density in peripubertal boys.

3D reconstruction from a vascular tree model

[EN] In this paper, we present a vascular tree model made with synthetic materials and which allows us to obtain images to make a 3D reconstruction.We have used PVC tubes of several diameters and lengths that will let us evaluate the accuracy of our 3D reconstruction. In order to calibrate the camera we have used a corner detector. Also we have used Optical Flow techniques to follow the points through the images going and going back. We describe two general techniques to extract a sequence of corresponding points from multiple views of an object. The resulting sequence of points will be used later to reconstruct a set of 3D points representing the object surfaces on the scene. We have made the 3D reconstruction choosing by chance a couple of images and we have calculated the projection error. After several repetitions, we have found the best 3D location for the point.

La Carpetania, ¿territorio étnico o región geográfica?

[ES]En el presente trabajo se pretende aportar una visión crítica en relación a la definición de la Carpetania como territorio étnico prerromano o región geográfica creada por el poder romano, partiendo del análisis de las fuentes escritas así como de los últimos hallazgos arqueológicos.