RESUMEN
STUDY DESIGN: Between-session reliability of a magnetic resonance imaging (MRI) based experimental technique to quantify lumbar inter-vertebral motion in humans. PURPOSE: We have developed a novel, dynamic, MRI-based approach for quantifying in vivo lumbar inter-vertebral motion. In this study, we present the protocol's reliability results to quantify inter-vertebral spine motion. OVERVIEW OF LITERATURE: Morphometric studies on intervertebral displacements using static, supine MRI and quantification of dynamic spine motion using different X-ray based radiography techniques are commonly found in the literature. However, reliability testing of techniques assessing real-time lumbar intervertebral motion using weight-bearing MRI has rarely been reported. METHODS: Ten adults without a history of back pain performed a side-bending task on two separate occasions, inside an open-MRI, in a weight-bearing, upright position. The images were acquired during the task using a dynamic magnetic resonance (MR) sequence. The MRI imaging space was externally calibrated before the study to recreate the imaging volume for subsequent use in an animation software. The dynamic MR images were processed to create side-bending movement animations in the virtual environment. Participant-specific three-dimensional models were manually superimposed over vertebral image silhouettes in a sequence of image frames, representing the motion trials. Inter-vertebral axes and translation and rotational displacements of vertebrae were quantified using the animation software. RESULTS: Quantification of inter-vertebral rotations and translations shows high reliability. Between-session reliability results yielded high values for the intra-class correlation coefficient (0.86-0.93), coefficient of variation (13.3%-16.04%), and Pearson's correlation coefficients (0.89-0.98). CONCLUSIONS: This technique may be developed further to improve its speed and accuracy for diagnostic applications, to study in vivo spine stability, and to assess outcomes of surgical and non-surgical interventions applied to manage pathological spine motion.
RESUMEN
Demonstrou-se que a N6-fufuriladenina (cinetina) tem efeitos anti-envelhecimento sobre varios sistemas diferentes incluido vegetais, celulas humanas em cultura, e moscas da fruta. Como a maior parte dos dados experimentais indicam que a cinetina age como antioxidante tanto in vitro quanto in vivo, e como se acumulam evidencias de que o dano oxidativo causa envelhecimento, testamos diretamente as propriedade antioxidantes da cinetina. Usando como marcador do dano oxidativo a 8-oxo-2'desoxiguanosina (8-oxo-dG) no DNA do timo de bezerros, demonstramos que a cinetina proteje o DNA significantemente (P< 0,005) contra o dano oxidativo mediado pela reacao de Fenton. A cinetina inibiu a formacao de 8-oxo-dG de forma dose-dependente, a protecao maxima de 50% sendo observada com uM de cinetina