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ios developer account:Natural soundscapes boost health markers, lower stress

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WASHINGTON — Spending more time in green spaces might be just what the doctor ordered, according to a study that quantifies the health benefits of natural sounds, from improved mood and cognitive performance to decreased heart rate and sensitivity to pain.

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The paper was led by Dr Rachel Buxton, a conservation biologist at Canada's Carleton University, and published Monday (March 22) in the Proceedings of the National Academy of Sciences.

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"We tend to look at the acoustic environment from the perspective of noise pollution and how it disturbs wildlife, and how it has effects on visitors to parks and human health," she told AFP.

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"A lot of us conservation biologists are really interested in the inverse of that: what are the health benefits of natural acoustic environments?"

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Dr Buxton and her colleagues carried out a literature review to statistically analyse the patchwork of prior research in the area, which was mostly carried out in lab or hospital settings with sounds played to volunteers by headphones.

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Seven of the 36 studies examined traditional health outcomes, including heart rate, blood pressure, perceived pain, skin conductance — which is linked to emotional arousal — levels of the stress hormone cortisol, and t-wave amplitude, a measure of heart health.

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The rest measured potential precursors along the pathway to health, including metrics of perception, mood, and cognitive performance.

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Overall, there was an 184 per cent improvement in health and other positive affect outcomes in the groups exposed to natural sounds relative to comparison groups. 

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The natural sounds also led to a 28 per cent decrease in stress and annoyance. 

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Among the natural sounds played to the volunteers, the sound of water had the highest impact, followed by birdsong, then a mix of both.

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MENTAL HEALTH CRISIS

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The team also examined audio recordings from 68 US national parks recorded over the past 15 years at 221 different locations. 

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The sounds were categorised by those caused by humans, geophysical such as wind and rain or the sounds of water, and biological sounds made by mammals, birds, amphibians and others.

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Across all sites, water sounds were audible 23 per cent of the time and bird sounds could be heard 42 per cent of the time.

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Parks which received more visitors had much greater levels of human-driven sounds.

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The parks with the highest quality soundscapes — high levels of natural sounds and low levels of anthropogenic sounds — were in Alaska, Hawaii and the Pacific Northwest.

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But from their analysis of the lab research, "we did find some evidence that if you're listening to natural sounds and noise, your health outcomes are still better than if you're just listening to noise," said Buxton.

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What drives the effect? No one knows for sure, but Dr Buxton has a hypothesis: "Evolutionarily, an acoustic environment that has lots of natural sounds is a good indicator of a safe environment — so it allows for mental recuperation because we're not on edge."

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