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CTOnews.com, May 8 (Xinhua) A new study published in the European Heart Journal of Southern Medical University in Guangzhou shows that people who use their mobile phones for more than 30 minutes a week have a 12% higher risk of developing high blood pressure than those who use them for less than 30 minutes.

Qin Xianhui, a professor at Southern China Medical University and one of the authors of the study, said: "what affects people's heart health is the number of minutes people spend talking on their mobile phones. The longer they talk on their mobile phones, the higher the risk. The number of years of use of mobile phones or whether or not to use hands-free calls has no effect on the occurrence of high blood pressure. We need more research to confirm this finding."

At present, nearly 3/4 of the world's people over the age of 10 have mobile phones, while nearly 1.3 billion adults between the ages of 30 and 79 have high blood pressure. High blood pressure is a major risk factor for heart disease and stroke and is one of the leading causes of premature death worldwide. Cell phones emit low levels of radio frequency energy, which is associated with a short-term increase in blood pressure. Previous studies on the relationship between cell phone use and blood pressure are inconsistent, perhaps because they include multiple uses such as making phone calls, texting and playing games. CTOnews.com noted that the study looked specifically at the relationship between making and answering phone calls and new high blood pressure.

The study included 211000 adults (aged 37 to 73) who had previously no high blood pressure from the UK biological sample bank and collected information about their use of mobile phones through a self-reported touchscreen questionnaire. Including the number of years of use, the number of hours per week, whether to use hands-free devices or speakers, and so on. Participants are defined as mobile phone users as long as they use their mobile phone to make or answer calls at least once a week. After adjusting for factors such as age, sex, body mass index, race, poverty, family history of hypertension, education level, smoking, blood pressure, blood lipids, inflammation, blood sugar, kidney function and the use of drugs that lower cholesterol or blood sugar levels, the relationship between cell phone use and new hypertension was analyzed.

The average age of the participants was 54, of which 62% were women and 88% were mobile phone users. During an average follow-up of 12 years, a total of 13984 (7 per cent) participants developed high blood pressure. Compared with non-mobile users, mobile phone users have a 7% higher risk of developing high blood pressure. People who used their cell phones for more than 30 minutes a week were more likely to develop new high blood pressure than those who used them for less than 30 minutes, with a 12% increased risk. The results were similar in both men and women.

In more detail, compared with participants who used their mobile phones for less than 5 minutes a week, those who used 30-59 minutes, 1-3 hours, 4-6 hours and more than 6 hours a week had an increased risk of high blood pressure by 8%, 13%, 16% and 25%, respectively. Among mobile phone users, the number of years of using mobile phone and whether to use hands-free or not were not significantly related to the occurrence of hypertension.

The researchers also divided participants into low, medium and high groups according to whether they had a genetic risk of high blood pressure, and analyzed the relationship between their cell phone talk time (less than 30 minutes or more) and new high blood pressure. Genetic risk is based on data from the UK Biobank. The results showed that people who had a high genetic risk and talked on a mobile phone for at least 30 minutes a week were 33% more likely to develop high blood pressure than those who had a low genetic risk and talked on a mobile phone for less than 30 minutes a week.

Professor Qin said: "our results show that as long as you use your mobile phone for no more than 30 minutes a week, you will not increase the risk of high blood pressure. We need more research to confirm this finding, but before that, we suggest that we try to reduce the time spent talking on mobile phones to protect heart health."

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