ISLAMABAD (APP) - Long-haul flights can be risky for people with certain types of heart and lung conditions as well as anyone who have been operated recently. The environmental and physiologic changes that occur during routine commercial air travel can incite or exacerbate pre-existing cardiac and lung conditions. People should check with their physicians if they have significant health problems before they get on a plane, Health News reported. The drop in pressure that occurs as an aeroplane reaches cruising altitude makes it tougher for the blood to hold oxygen. Most healthy people can cope with this reduction in oxygen saturation, but for people with illnesses that cause them to have low oxygen blood levels in the first place, such as emphysema or congestive heart failure, it can be hazardous, particularly on flights more than a couple of hours long. Doctors may advise these patients to bring oxygen with them on the plane. Flying too soon after surgery can also cause problems. This is a particular concern for people who travel to have certain procedures. So-called long-haul flights, defined as any trip lasting eight hours or more, are known to increase the risk of a potentially fatal blood clot forming in the legs. The risk of these blood clots is quadrupled during long flights for the average person, while people with conditions that promote blood clotting are at even greater risk. The best strategies for preventing these deadly blood clots are common-sense and include keeping well-hydrated, avoiding caffeine and alcohol, getting up to stretch and walk around the cabin, and doing calf-stretching exercises in your seat. One in-flight health concern that people shouldnt worry about too much is the risk of contracting contagious disease. While flights can indeed promote the geographic spread of disease during an epidemic, the risk of catching the infection is typically limited to people sitting within two rows of the contagious person. In fact, because aeroplanes use HEPA filters to keep cabin air clean, a plane may actually be a bit safer than other modes of mass transportation, for example buses and subways, at least when it comes to catching the flu. Active lifestyle essential for maintaining good health A recent research found that sedentary behaviour, especially watching television, was associated with significantly elevated risk of obesity and type II diabetes . Researchers from the Harvard School of Public Health did a study to examine the relationship between various sedentary behaviours, especially prolonged television watching, and risk of obesity and type II diabetes in women, BBC radio reported. The study emphasises the importance of reducing sedentary behaviour for preventing obesity and diabetes. The researchers suggested that a relatively active lifestyle is essential for maintaining good health. They recommend less than 10 hours of television viewing in a week and more than 30 minutes of brisk walking every day. The study was conducted among women from 11 American states. The research study group for obesity included 50,277 women who had a body mass index (BMI) of less than 30 and were free from any cardiovascular disease, diabetes, or cancer. The diabetes analysis included 68,497 women who were free from diabetes mellitus, cardiovascular disease, or cancer. Over 6 years, 3,757 women had become obese and 1,515 new cases of type II diabetes were documented in the respective study groups. Time spent watching TV was found to be positively associated with the risk of obesity and type II diabetes. The researchers found that for every two hours spent daily watching TV there was a 23 per cent increase in the risk of obesity and a 14 per cent increase for diabetes. Also, two hours per day increment in sitting at work was associated with a 5% increase in obesity and a 7% increase in diabetes. In contrast, standing or walking around at home two hours per day was associated with a 9% reduction in obesity and a 12% reduction in diabetes. One hour of brisk walking per day was associated with a 24% reduction in obesity and a 34% reduction in diabetes. Family quarrels may promote headaches in children : Study A new study has revealed that family quarrels and lack of free time can lead to headaches in children. The research led by Jennifer Gassmann has revealed that boys who experiencedmore than one family quarrel per week had a 1.8 times higher risk of developing headaches, Health News reported. The amount of free time available to them seemed to be even more important. The findings revealed that boys who only sometimes had time to themselves had a 2.1 times higher risk of developing headaches. Parents behaviour when their child complains of headache also seemed to play a major role. Either positive or negative reinforcement from the parents teaches the child that he or she can gain certain advantages from headache symptoms. The parents responses had a particularly strong effect on the frequency of symptoms in girls: reinforcing parental responses raised their risk of recurrent headaches by 25 percent. The study also showed that twice as many girls as boys had their symptoms at least once a week.