La risa disminuye los niveles de hormonas asociadas con el estrés

Según un estudio de la Universidad de Maryland, las personas que han padecido un infarto del miocardio ríen hasta un 40% menos que las personas sin ese antecedente.

La risa, al igual que el llanto, es un acto involuntario para la mayoría de las personas. Su mecanismo de funcionamiento reside en la respiración, y se produce mediante interrupciones de la exhalación del aliento. Este proceso activa, además del sistema respiratorio, otros sistemas de nuestro organismo, como son el neurológico y el cardiovascular., según recuerda la Fundación Española del Corazón (FEC).

El efecto de la risa en nuestro sistema cardiovascular es vasodilatador; la risa genera  endorfinas, que producen un estado de bienestar psicológico, de tal manera que ésta ayuda a proteger el aparato cardiovascular. Cuando reímos, el endotelio  se relaja, mejorando así la circulación de la sangre y disminuyendo la presión arterial.

El Dr. José Luis Palma Gámiz, vicepresidente de la FEC, afirma que "la risa y la actitud positiva frente a la vida son beneficiosas para la salud cardiovascular. Por el contrario, los estados de estrés producen alteraciones en la pared vascular y favorecen la aparición de arteriosclerosis". El doctor Palma añade que “el estrés permanente condiciona la presencia de sustancias  vasoconstrictoras que afectan al endotelio y facilitan  que  el colesterol, penetren en la pared interior de los vasos sanguíneos, dando lugar a distintas enfermedades cardiovasculares”.

Reír también ayuda a aumentar el HDL  y potencia la actividad de los linfocitos. Reír reduce, además, el nivel de hormonas asociadas al estrés y aumenta el nivel de óxido nítrico, por lo que mejora la circulación, reduce la inflamación  y previene la formación de placas de colesterol.

Según explica el Dr.Palma, “el óxido nítrico es el vasodilatador natural más potente que se conoce. Cuando actúan conjuntamente sustancias como la serotonina y el óxido nítrico se producen las condiciones óptimas para una mayor vasodilatación, especialmente en los pequeños vasos sanguíneos, y, por tanto, disminuye la posibilidad de que se produzca una alteración del endotelio”.

Diferencia diametrial arterial

Son varios los estudios que han constatado beneficios de la risa en nuestro sistema cardiovascular. uno de ellos, realizado por la Unidad de Cardiología Preventiva del Centro Médico de la Universidad de Maryland, demostró que las personas que han sufrido un infarto agudo de miocardio ríen hasta un 40% menos que las personas que no han sufrido ningún tipo de enfermedad cardiovascular.

Este mismo centro realizó otro estudio en el que sometió a los participantes a situaciones cómicas y estresantes a través del visionado de películas. Tras analizar su reacción fisiológica, se comprobó que la diferencia diametral arterial entre estas dos situaciones opuestas oscilaba entre un 30% y un 50%. Así, en el caso de las películas estresantes, las arterias se contraían dificultando el aporte sanguíneo y aumentando el riesgo de sufrir problemas cardiovasculares, mientras que en situaciones cómicas, se dilataban, mejorando así la circulación de la sangre.

El Dr. Palma recuerda, por último, que “estar en paz con uno mismo y con su entorno y tener una actitud positiva frente a la vida, viendo los aspectos buenos, ayuda a prevenir las enfermedades cardiovasculares".

Tomado de: Jano.es

CLASE TRASTORNOS DE LA HEMOSTASIA EN HEPATOPATIAS

CLASE TRASTORNOS DE LA HEMOSTASIA EN HEPATOPATIAS

ROTACIONPATOLOGIA CLINICA

ABRIL 2015

NEW STUDY INDICATES THAT EXERCISE IMPROVES NON-ALCOHOLIC FATTY LIVER DISEASE

Non-alcoholic fatty liver disease (NAFLD) is the most common cause of chronic liver disease in the western world. A new study published in the Journal of Hepatology shows that exercise, regardless of frequency or intensity, benefits obese and overweight adults with NAFLD.

NAFLD is considered the hepatic manifestation of metabolic syndrome and is commonly associated with obesity and diabetes. There are no approved drug treatments for NAFLD, but lifestyle interventions such as diet, exercise, and the resulting weight loss have been shown to help improve NAFLD. In particular, these interventions can improve some features of non-alcoholic steatohepatitis (NASH), which is the progressive form of NAFLD.

Weight loss is the commonly recommended strategy for all obese and overweight patients with NAFLD. Both aerobic and resistance training-based exercise regimens reduce liver fat as well as visceral fat. However, the exact role of the amount and the intensity of aerobic exercise that would be needed to reverse or improve NAFLD (or NASH) had not been systematically assessed.

In the new study published in the Journal of Hepatology, investigators examined the effect of various aerobic exercise regimens in improving liver and visceral fat in overweight and obese people who had sedentary lifestyles. Using a randomized, placebo-controlled clinical trial (RCT) design, they randomized 48 participants into four equal groups of 12 people: low-to-moderate intensity, high-volume aerobic exercise (LO:HI); high-intensity, low-volume aerobic exercise (HI:LO); low-to-moderate intensity, low-volume aerobic exercise (LO:LO); and placebo (PLA) for an eight-week period. Change in liver fat was assessed by magnetic resonance spectroscopy (MRS).

All three groups, irrespective of the exercise regimen, showed improvement in liver fat of about 18-29% from the average baseline 7.5%, compared with the placebo group in which liver fat increased by an average of 14%. The improvement was independent of weight loss. There were no significant differences between the various aerobic exercise regimens in reducing liver fat over an eight-week period. However, the investigators conducted additional exploratory analyses and proposed that there was a trend towards greater reduction in liver fat and visceral fat in the two groups that utilized either high intensity with low volume (HI:LO) or low intensity with high volume (LO:HI) aerobic exercise.

“The results from our study show that all exercise doses, irrespective of volume or intensity, were efficacious in reducing liver fat and visceral fat by an amount that was clinically significant, in previously inactive, overweight, or obese adults compared with placebo. These changes were observed without clinically significant weight loss,” explained lead investigator Dr. Nathan Johnson, PhD, Senior Lecturer at the University of Sydney, Australia. “We found no difference between exercise regimens for these benefits,” added Jacob George, PhD, MBBS, Professor of Hepatic Medicine at the University of Sydney, Australia, and Head of the Department of Gastroenterology and Hepatology at Westmead Hospital and University of Sydney.

In an editorial in the same issue, Rohit Loomba, MD, MHSc, of the Division of Gastroenterology and Epidemiology at the University of California, San Diego, and Helena Cortez-Pinto, MD, PhD, of the Gastroenterology Service, Hospital de Santa Maria, Lisbon, Portugal, observed that “There is good quality evidence to support that regular exercise is beneficial in reducing the risk of NAFLD. In addition, both aerobic and resistance training regimens are equally effective in reducing liver fat in individuals with NAFLD even in the absence of weight loss.

They suggest that duration of exercise and intensity of exercise are both important and one could perhaps personalize the exercise regimen based upon a participant’s choice and still achieve similar results. “There are, however, no data to support that exercise alone without weight loss can improve or reverse NASH. There is preliminary evidence that vigorous exercise may be associated with a decreased risk of having NASH,” added Dr. Loomba and Dr. Cortez-Pinto. “The individual and joint effect of dose and intensity of exercise and their association with improvement in liver fat and other histologic features that are associated with NASH is a key research priority. In our expert opinion, a more stringent exercise-regimen than the U.S. Department of Health and Human Services recommends, coupled with dietary interventions, may be needed to induce improvement in liver histologic features associated with NASH.”

Tomado de:http://www.easl.eu/.  JOURNAL OF HEPATOLOGY - EASL APRIL 08,2015

CRITERIOS DIAGNOSTICOS DE ADA PARA DIABETES MELLITUS 2015

Classification and Diagnosis of Diabetes 2015