OPTIMISM & HEART PROBLEMS

Being an optimist 'may protect against heart problems'

Being cheerful may protect against heart problems, say US experts.

Happy, optimistic people have a lower risk of heart disease and stroke, a Harvard School of Public Health review of more than 200 studies - reported in Psychological Bulletin - suggests.

While such people may be generally healthier, scientists think a sense of well-being may lower risk factors such as high blood pressure and cholesterol.

Stress and depression have already been linked to heart disease.

The researcher from the Harvard School of Public Health trawled medical trial databases to find studies that had recorded psychological well-being and cardiovascular health.

This revealed that factors such as optimism, life satisfaction, and happiness appeared to be linked associated with a reduced risk of heart and circulatory diseases, regardless of a person's age, socio-economic status, smoking status or body weight.

Disease risk was 50% lower among the most optimistic individuals.

'Not proof'

Dr Julia Boehm and colleagues stress that their work only suggests a link and is not proof that well-being buffers against heart disease.

And not only is it difficult to objectively measure well-being, other heart risk factors like cholesterol and diabetes are more important when it comes to reducing disease.

The people in the study who were more optimistic also engaged in healthier behaviours such as getting more exercising and eating a balanced diet, which will have some influence.

But even when they controlled for these factors and others, like sleep quality, the link between optimism and better heart health remained.

Although they looked at 200 studies, the researchers say this number is still not enough to draw firm conclusions and recommend more research.

Much of the past work on mood and heart disease has looked at stress and anxiety rather than happiness.

Maureen Talbot, senior cardiac nurse at the British Heart Foundation, said: "The association between heart disease and mental health is very complex and still not fully understood.

"Although this study didn't look at the effects of stress, it does confirm what we already know which is psychological well-being is an important part of a healthy lifestyle, just like staying active and eating healthily.

"It also highlights the need for healthcare professionals to provide a holistic approach to care, taking into account the state of someone's mental health and monitoring its effect on their physical health."

LINK:
       http://www.bbc.co.uk/news/health-17733371

EXERCISE REDUCES DEPRESSION

Exercise Reduces Depression Risk

People who take regular exercise during their free time are less likely to have symptoms of depression and anxiety, a study of 40,000 Norwegians has found.

But physical activity which is part and parcel of the working day does not have the same effect, it suggests.

Writing in the British Journal of Psychiatry, the researchers said it was probably because there was not the same level of social interaction.

The charity Mind said that exercise and interaction aids our mental health.

Higher levels of social interaction during leisure time were found to be part of the reason for the link.

Researchers from the Institute of Psychiatry at King's College London teamed up with academics from the Norwegian Institute of Public Health and the University of Bergen in Norway to conduct the study.

Participants were asked how often, and to what degree, they undertook physical activity in their leisure time and during the course of their work.

Researchers also measured participants' depression and anxiety using the Hospital Anxiety and Depression Scale.

People who were not active in their leisure time were almost twice as likely to have symptoms of depression compared to the most active individuals, the study found.

But the intensity of the exercise did not seem to make any difference.

Social benefits

Lead researcher Dr Samuel Harvey, from the Institute of Psychiatry, said: "Our study shows that people who engage in regular leisure-time activity of any intensity are less likely to have symptoms of depression.

"We also found that the context in which activity takes place is vital and that the social benefits associated with exercise, like increased numbers of friends and social support, are more important in understanding how exercise may be linked to improved mental health than any biological markers of fitness.

"This may explain why leisure activity appears to have benefits not seen with physical activity undertaken as part of a working day."

Paul Farmer, chief executive of the mental health charity Mind, said that lifestyle factors such as diet and exercise are known to have a positive impact on mental well-being.

"Exercise gives you a natural high and is a great way to boost your mood. However, another mental health benefit of physical activity is derived from social interaction.

"So going out with a running club, taking part in a team sport or working on a communal allotment is far better for your mental well-being than a physically demanding job.

"Mind has found that after just a short country walk 90% of people had increased self-esteem," Mr Farmer said. 

LINK:
 http://www.bbc.co.uk/news/health-11644775

DIABETES & SHIFT WORKING

SHIFT WORKERS AT THE RISK OF TYPE-2 DIABETES AND OBESITY

Shift workers getting too little sleep at the wrong time of day may be increasing their risk of diabetes and obesity, according to researchers.

The team is calling for more measures to reduce the impact of shift working following the results of its study.

Researchers controlled the lives of 21 people, including meal and bedtimes.

The results, published in Science Translational Medicine, showed changes to normal sleep meant the body struggled to control sugar levels.

Some participants even developed early symptoms of diabetes within weeks.

Shift work has been associated with a host of health problems.

Doctors at Brigham and Women's Hospital, in the US, were trying to study its effects in a controlled environment.

Lower insulin levels

The 21 health-trial participants started with 10 hours' sleep at night. This was followed by three weeks of disruption to their sleep and body clocks.

Dr Orfeu Buxton Brigham and Women's Hospital

The length of the day was extended to 28 hours, creating an effect similar to a full-time flyer constantly getting jet lag.

MOBILE PHONES, PREGNANCY AND ADHD

Mobile Phone use during pregnancy may cause ADHD in offspring

A study suggest mobile phone use by pregnant mothers can affect fetuses (Image: Shutterstock)
 

Everything you wanted to know what to do during pregnancy

While there have been – and continue to be – numerous studies examining the effects of radiation from mobile phones on users, Yale School of Medicine researchers have looked at the possible effects on fetuses of mobile phone use by pregnant mothers. According to the study, mobile phone radiation exposure in the womb can affect the brain development of offspring and potentially lead to behavioral disorders such as hyperactivity.

A team led by Dr. Hugh S. Taylor, professor and chief of the Division of Reproductive Endocrinology and Infertility in the Department of Obstetrics, Gynecology & Reproductive Sciences at Yale, exposed pregnant mice to mobile phone radiation by positioning a muted mobile phone placed on an active phone call above their cage for the duration of the trial. The same conditions but with a deactivated phone were replicated for a control group.

A battery of tests measuring the electrical activity of the brains of adult mice that were exposed to radiation as fetuses showed that they tended to be more hyperactive and had reduced memory capacity when compared to the control group.

Although the definition of attention deficit hyperactivity disorder (ADHD) is based on behavior and is not classified as a neurological disease, magnetic resonance imaging of the prefrontal cortex in sufferers has shown a development lag in this area of the brain. This led Taylor to attribute the behavioral changes in the mice to an effect of mobile phone radiation on the development of neurons in the prefrontal cortex during pregnancy.

“This is the first experimental evidence that fetal exposure to radiofrequency radiation from cellular telephones does in fact affect adult behavior,” Taylor told Yale News. “We have shown that behavioral problems in mice that resemble ADHD are caused by cell phone exposure in the womb. The rise in behavioral disorders in human children may be in part due to fetal cellular telephone irradiation exposure.”

Although Taylor admits that further research in humans into the mechanisms behind the findings is needed to identify safe exposure limits during pregnancy, he says that limiting exposure of the fetus to mobile phone radiation seems advisable.

“Cell phones were used in this study to mimic potential human exposure but future research will instead use standard electromagnetic field generators to more precisely define the level of exposure,” said first author of the study Tamir Aldad, who added that mice pregnancies last only 19 days and that mice are born with less-developed brains than human babies

The team’s study appears in Nature’s Scientific Report.

(http://www.nature.com/srep/2012/120315/srep00312/full/srep00312.html)