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Vertical greenery can act as a stress buffer, NTU Singapore study finds

Vertical greenery can act as a stress buffer, NTU Singapore study finds
2021-07-06
(Press-News.org) Vertical greenery 'planted' on the exterior of buildings may help to buffer people against stress, a Nanyang Technological University, Singapore (NTU Singapore) study has found.

The benefits of nature on mental health and for wellbeing have long been recognised, and now a team of NTU Singapore psychologists has used Virtual Reality (VR) to examine whether vertical greenery has a stress buffering effect (ability to moderate the detrimental consequences of stress) in an urban environment.

Using VR headsets, 111 participants were asked to walk down a virtual street for five minutes. Participants were randomly assigned to either a street that featured rows of planted greenery (e.g., on balconies, walls, and pillars of buildings), or one with only buildings that had green painted walls in place of green plants. The virtual environments used in the study was developed by the NTU research team.

To match a real-world experience, heavy traffic noise was played as the participants walked through the virtual street. Heart rate variability, which is a physiological indicator of stress, was continuously monitored using a portable electrocardiogram (ECG) device.

The study found that those who viewed buildings which only had green paint experienced a signi?cant increase in stress as recorded by one measure of heart rate variability, while those who viewed the buildings with the green plants did not experience any change in stress.

Following the experiment, participants answered a questionnaire that assessed their positive (e.g., interested, excited) and negative emotions (e.g., upset, hostile), and the level of anxiety they were feeling.

Participants reported feeling less positive when walking through the street with buildings covered by only green walls, while those walking through the street with buildings covered by plants did not report feeling either more or less positive.

The findings published in the peer-reviewed academic journal Landscape and Urban Planning, have implications for the well-being of people living in urban areas and can guide greening efforts in cities, say the researchers.

Walls of greenery can help lower ambient temperature, which reduces energy consumption from cooling systems. They can also reduce carbon emissions and lessen the effect of 'urban heat island' - a phenomenon where city centres experience much warmer temperatures than less populated areas because of limited greenery and a high concentration of built structures.

While vertical greenery is often planted for these sustainability benefits, the NTU study is one of the first to explore its contribution to mental health, and the authors say that it provides additional impetus for city planners to adopt a 'biophilic design' concept - an approach to architecture that seeks to connect people more closely to nature - which is favoured in cities such as Singapore, Wellington (NZ), and San Francisco.

Principal investigator of the study, Associate Professor Lin Qiu from the Psychology programme at the NTU School of Social Sciences said, "With urbanisation, more people are expected to be living in urban areas globally in future. It is thus important for urban city planners and architects to understand factors that can contribute to healthy living, as urban planning can have a direct impact on quality of life for the population. Our work can guide efforts to green cities, by providing evidence of how vertical greenery can be a viable way to integrate nature into our built environment and promote mental health."

Co-lead author of the research, Sarah Chan, a Ph.D. candidate from the Interdisciplinary Graduate Programme at NTU said, "Our ?ndings have important practical implications for city planning and design, especially for high density urban areas that face land constraints. It provides evidence that vertical greenery systems, which make use of vertical structures above-ground, may help moderate the detrimental consequences of stress.

"While previous studies looked at effects of green vegetation, the fact that the colour green could simply be a primitive visual feature, resulting in positive effects, was not considered. Thanks to emerging technology like VR, we overcame this limitation and were able to use a control condition, matching vertical greenery with the colour green in our study."

Moving forward, the NTU research team plans to use VR to investigate the psychological impact of using nature in architecture, for instance, using natural materials like wood compared to concrete.

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Vertical greenery can act as a stress buffer, NTU Singapore study finds

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[Press-News.org] Vertical greenery can act as a stress buffer, NTU Singapore study finds