noise pollution

We’re so use to it that a lot of us hardly notice the noise that surrounds us everyday, but our hearts may be picking up the buzz.

Researchers in Germany had more than 100 people record their heart activity over several 6-hour spans. They also recorded surrounding noise levels.

The sounds were classified as either above or below a threshold of 65 decibels, which is the level of a normal conversation. The corresponding heart activity was then analyzed.

According to the results, the heart’s ability to adapt to acute events was affected by as little as a 5 decibel increase in exposure no matter what level the noise started at.

The researchers say their findings show that noise at low levels may be just as harmful to your health as noise at high levels.

Since the average age of the participants was 61, there is interest in repeating the study with younger people to see if the results are the same.

I’m Dr. Cindy Haines of HealthDay TV, with the news doctors are reading health news that matters to you.

Health And Wellness Guide
Industrial Noize Pollution: Music Good For Your Heart

What do grasshoppers do to deal with human’s noise pollution?

PARIS – For city grasshoppers, noise just isn’t cricket. Loud traffic drowns out the song the male grasshopper makes, rubbing a toothed file on his hind legs against a protruding vein on his front wings, to lure a mate. But, German biologists have discovered, the clever insect has found a way to get his offer of romance through the din.

Grasshoppers change the song so that it boosts lower-frequency notes, making it audible over the rumble from the road.

Ulrike Lampe and colleagues from the University of Bielefeld captured 188 male bow-winged grasshoppers (Chorthippus biguttulus), half from quiet locations and half from beside busy roads. The team made nearly 1,000 lab recordings of each grasshopper, placing a cute female grasshopper nearby to encourage a serenade.

“Bow-winged grasshoppers produce songs that include low- and high-frequency components,” said Lampe.

“We found that grasshoppers from noisy habitats boost the volume of the lower-frequency part of their song, which makes sense since road noise can mask signals in this part of the frequency spectrum.”

The findings add insects to the list of animals, including species of birds, whales and frogs, that have been found to alter their sounds in order to cope with man-made noise. The paper appears in Functional Ecology, published by the British Ecological Society (BES). Bow-winged grasshoppers are a common species in central Europe.

The male’s courtship song consists of up to half a dozen phrases, each about two or three seconds long. The phrase starts with a ticking sound, becomes louder and ends in a buzz. – Sapa-AFP

Tag: noise pollution

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