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...were programmed to take readings at 15-min. intervals throughout the night. The volunteers' bedrooms were also equipped with an MP3 recorder and a noise-meter, which recorded all ambient noise, its timing and its volume. Researchers considered a "noise event" to have occurred if any sound, from road traffic, aircraft or a partner's snoring, exceeded 35 decibels (dB) - not a very high threshold, considering that a quiet whisper from 3 ft. away measures about 30 dB and the hum of a refrigerator logs about 40 dB. Noise levels recorded in volunteers' bedrooms fluctuated between about...
...Airplane noise, for example, caused an average 6.2 mmHg increase in systolic blood pressure (the pressure of blood in the artery when the heart contracts - i.e., the larger, top number) and a 7.4 mmHg increase in diastolic pressure (when the heart relaxes between beats). A snoring partner and road traffic had similar impact. And the effect was dose dependent: The louder the noise, the higher the jump in blood pressure. For every additional 5 dB in volume of aircraft noise, systolic and diastolic blood pressure rose another 0.65 mmHg each. "It's a small increase in the blood pressure, obviously...
...report was a corollary of a much larger study conducted by the same research group, examining the relationship between hypertension and nighttime exposure to noise near airports or daily exposure to road traffic noise. That study, which appeared online in the journal Environmental Health Perspectives last December, involved 4,861 participants, aged 45 to 70, who had lived at least five years near a major European airport. Researchers found that nighttime airport noise was linked to a significant increase in risk for hypertension; every 10 dB increase in exposure led to a corresponding 14% rise in high blood pressure risk...
...charge probably won't deter London's superrich from tooling down Park Lane in their Lamborghinis, and Johnson is right that affluent households may just add a brace of low-emissions cars to their private transport options. A small increase in traffic as people take advantage of the exemption is unlikely to worry the Mayor, whose main aim is to wean people off private cars and onto buses, tubes and bikes. He says the scheme will be monitored and the exemption repealed if "hordes of people with a malignant turn of mind rush out to buy [low-emissions] cars just...
...play goals to the opposition all season. The frame finished with one more Harvard goal, scored by Vaillancourt off of an assist from Chute. The Crimson recovered the puck from Union in its own end then quickly skated it up the ice, where Vaillancourt was able to navigate through traffic for her team-high 14th goal of the season. Union goalie Lundy Day saved all 18 of Harvard’s shots in the third period to keep the score at its final 4-0 count. The game was the Crimson’s fourth in eight days, as early...