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Medina-Meza I.G.,Instituto Tecnologico Of Estudios Superiores Of Occidente Iteso | Rodriguez-Estrada M.T.,University of Bologna | Garcia H.S.,Instituto Tecnologico De Veracruz | Lercker G.,University of Bologna
Food Biophysics | Year: 2012

The photo-oxidation of crystalline cholesterol in the presence of hematoporphyrin was kinetically studied. Samples were exposed to fluorescent light at 12 °C for 48 h (Test-A) and 21 days (Test-B). A method based on aminopropyl solid-phase extraction (SPE), followed by GC-MS analysis was employed for the identification and quantification of cholesterol oxidative compounds (COPs). In early stages of photo-oxidation (Test-A), a hyperbolic behavior on peroxides value was found, but not quantifiable secondary products were detected. In Test-B, 58 % of cholesterol was remained after exposure, due probably to exhaustion of hematoporphyrin and/or physical state of sample. Type II photo-oxidation seemed to be quantitatively predominant, in respect to Type I. 3,6-dione and 6β-OH generated in highest amount, following by 5,6α-epoxy and 7α-OH. Oxidative pattern shows the formation of other minor compounds, such as 7-ketostanol, 6-ketostanol and 4β-OH. This last one was previously attributed only to enzymatic oxidation. Finally, the relationship between 7-keto and 25-OH were strongly shifted toward the side-chain product, due probably to the exposure of aliphatic chain in crystalline cholesterol. These results confirm the crucial importance of physical state of cholesterol during photo-oxidation, giving an interesting and more complex degradation behavior. © 2012 Springer Science+Business Media, LLC.


Orejudo S.,University of Zaragoza | Camacho E.,Instituto Tecnologico Of Estudios Superiores Of Occidente Iteso | Vega-Michel C.,Instituto Tecnologico Of Estudios Superiores Of Occidente Iteso
Revista de Psicopatologia y Psicologia Clinica | Year: 2012

Based on Grossarth-Maticek and Eysenck's personality typology which relates types of personality with certain diseases, this study analyzes, in two samples of Mexican and Spanish students, the relationship between personality type and the propensity for cancer and the propensity for cardiovascular disease, and tobacco consumption and the levels of salivary cortisol. A total of 190 Mexican and Spanish university students responded to the Short Interpersonal Reactions Inventory (SIRI) while we took saliva samples before and after the task. The results reveal that the more important effect came from the country of origin, with higher cortisol levels in the Mexican students. On the other hand, only in these students tobacco use and the type of personality were found to increase cortisol levels. The results are discussed from the perspective of Grossarth-Ma-ticek and Eysenck's theory as well as from the perspective of differences between countries and cortisol as a health risk.


Rodriguez Martinez Md.el,Instituto Tecnologico Of Estudios Superiores Of Occidente Iteso | Galaviz K.I.,Instituto Tecnologico Of Estudios Superiores Of Occidente Iteso | Ulloa E.J.,Instituto Tecnologico Of Estudios Superiores Of Occidente Iteso | Gonzalez-Casanova I.,Instituto Tecnologico Of Estudios Superiores Of Occidente Iteso | Lopez y Taylor J.R.,Instituto Tecnologico Of Estudios Superiores Of Occidente Iteso
Journal of physical activity & health | Year: 2014

BACKGROUND: The Mexican Report Card on Physical Activity in children and youth was first developed in 2012 as a tool aimed at informing policy and practice. The objective of this paper is to update the Report Card to reflect the current situation in Mexico.METHODS: A literature search was conducted in Spanish and English using major databases, and complemented with government documents and national health surveys. Information on the 9 indicators outlined in the Global Matrix of Report Card Grades was extracted. Experts from Mexico and Canada met to discuss and assign a grade on each indicator.RESULTS: The physical activity indicator was assigned a C+, which was higher than in the previous report card. Sedentary behavior was assigned a D, which was lower than the previous report card. Organized Sports and Active Transportation, which were not graded in the previous report card, were assigned grades of D and B-, respectively. Government and Built Environment were assigned grades of C and F, respectively. Family and Peers and Active Play were not graded (INC).CONCLUSIONS: Levels of PA and sedentary behaviors among Mexican children and youth were below the respective recommended references. The implementation and effectiveness of current government strategies need to be determined. The Mexican Report Card is a promising knowledge translation tool that can serve to inform policies and programs related to physical activity.

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