It is already estimated that one in 10 of London’s children and adolescents between the ages of five and 16 suffer from a clinical mental health illness and excess costs are estimated between £11,030 and £59,130 annually for each person. As with adults, there is also evidence that natural environments play an important role in children and adolescents’ cognitive development and mental health into adulthood, but less is known about why this is. Examples of other explanatory variables considered included the young person’s age, ethnic background, gender, parental occupation and type of school, e.g., state or independent. The level of air pollution might have influenced adolescents’ cognitive development, but researchers did not feel these observations were reliable or conclusive, and these require further investigations. The results of this study suggest that urban planning decisions to optimize ecosystem benefits linked to cognitive development and mental health should carefully consider the type of natural environment included. Natural environments further away from an adolescent’s residence and school may play an important role too, not just their immediate environment.
After adjusting for other variables, the results showed that higher daily exposure to woodland (but not grassland) was associated with higher scores for cognitive development, and a 16% lower risk of emotional and behavioral problems two years later. The environments were divided into what planners call green space (woods, meadows and parks) and blue space (rivers, lakes and the sea), with green space separated further into grassland and woodland. Researchers used satellite data to help calculate each adolescent’s daily exposure rate to each of these environments within 50m, 100m, 250m and 500m of their home and school.
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A similar but smaller effect was seen for green space, with higher scores for cognitive development, but this was not seen for blue space. The researchers note though that access to blue space in the cohort studied was generally low. The study, published in Nature Sustainability, looked at the links between different types of natural urban environments and the pupils’ cognitive development, mental health and overall well-being.
Joint senior author Professor Mireille Toledano (Director, Mohn Centre for Children’s Health and Wellbeing and Investigator, MRC Centre for Environment and Health and Principal Investigator of the SCAMP study, Imperial College London) said: “It’s been suggested previously that the benefits of natural environments to mental health are comparable in magnitude to family history, parental age and even more significant than factors like the degree of urbanization around you, but lower than your parents’ socio-economic status. Sensory and non-sensory pathways have been suggested as potentially important for delivering cognition and mental health benefits received from exposure to nature. “It’s critical for us to tease out why natural environments are so important to our mental health throughout the life course – does the benefit derive from the physical exercise we do in these environments, from the social interactions we often have in them, or from the fauna and flora we get to enjoy in these environments or a combination of all of these?” “Forest bathing, for example (being immersed in the sights, sounds and smells of a forest), is a relaxation therapy that has been associated with physiological benefits, supporting the human immune function, reducing heart rate variability and salivary cortisol, and various psychological benefits. However, the reasons why we experience these psychological benefits from woodland remain unknown.”
“These findings contribute to our understanding of natural environment types as an important protective factor for an adolescent’s cognitive development and mental health and suggest that not every environment type may contribute equally to these health benefits. Lead author, PhD student Mikaël Maes (UCL Geography, UCL Biosciences and Imperial College London School of Public Health) said: “Previous studies have revealed positive associations between exposure to nature in urban environments, cognitive development and mental health. Why these health benefits are received remains unclear, especially in adolescents.
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