Nature contact and general health: Testing multiple serial mediation pathways with data from adults in 18 countries.

The role of neighbourhood nature in promoting good health is increasingly recognised in policy and practice, but consistent evidence for the underlying mechanisms is lacking. Heterogeneity in exposure methods, outcome measures, and population characteristics, little exploration of recreational use or the role of different types of green or blue space, and multiple separate mediation models in previous studies have limited our ability to synthesise findings and draw clear conclusions. We examined multiple pathways linking different types of neighbourhood nature with general health using a harmonised international sample of adults. Using cross-sectional survey data from 18 countries (n = 15,917), we developed a multigroup path model to test theorised pathways, controlling for sociodemographic variables. We tested the possibility that neighbourhood nature (e.g. greenspace, inland bluespace, and coastal bluespace) would be associated with general health through lower air pollution exposure, greater physical activity attainment, more social contact, and higher subjective well-being. However, our central prediction was that associations between different types of neighbourhood nature and general health would largely be serially mediated by recent visit frequency to corresponding environment types, and, subsequently, physical activity, social contact, and subjective well-being associated with these frequencies. Several subsidiary analyses assessed the robustness of the results to alternative model specifications as well as effect modification by sociodemographics. Consistent with this prediction, there was statistical support for eight of nine potential serial mediation pathways via visit frequency which held for a range of alternative model specifications. Effect modification by financial strain, sex, age, and urbanicity altered some associations but did not necessarily support the idea that nature reduced health inequalities. The results demonstrate that across countries, theorised nature-health linkages operate primarily through recreational contact with natural environments. This provides arguments for greater efforts to support use of local green/blue spaces for health promotion and disease prevention.

Country-level factors in a failing relationship with nature: Nature connectedness as a key metric for a sustainable future.

Climate change and biodiversity loss show that the human-nature relationship is failing. That relationship can be measured through the construct of nature connectedness which is a key factor in pro-environmental behaviours and mental well-being. Country-level indicators of extinction of nature experience, consumption and commerce, use and control of nature and negativistic factors were selected. An exploratory analysis of the relationship between these metrics and nature connectedness across adult samples from 14 European countries was conducted (n = 14,745 respondents). The analysis provides insight into how affluence, technology and consumption are associated with the human-nature relationship. These findings motivate a comparison of how nature connectedness and composite indicators of prosperity, progress, development, and sustainability relate to indicators of human and nature's well-being. In comparison to composite indexes, it is proposed that nature connectedness is a critical indicator of human and nature's well-being needed to inform the transition to a sustainable future.

GroundsWell: Community-engaged and data-informed systems transformation of Urban Green and Blue Space for population health - a new initiative.

Natural environments, such as parks, woodlands and lakes, have positive impacts on health and wellbeing. Urban Green and Blue Spaces (UGBS), and the activities that take place in them, can significantly influence the health outcomes of all communities, and reduce health inequalities. Improving access and quality of UGBS needs understanding of the range of systems (e.g. planning, transport, environment, community) in which UGBS are located. UGBS offers an ideal exemplar for testing systems innovations as it reflects place-based and whole society processes , with potential to reduce non-communicable disease (NCD) risk and associated social inequalities in health. UGBS can impact multiple behavioural and environmental aetiological pathways. However, the systems which desire, design, develop, and deliver UGBS are fragmented and siloed, with ineffective mechanisms for data generation, knowledge exchange and mobilisation. Further, UGBS need to be co-designed with and by those whose health could benefit most from them, so they are appropriate, accessible, valued and used well. This paper describes a major new prevention research programme and partnership, GroundsWell, which aims to transform UGBS-related systems by improving how we plan, design, evaluate and manage UGBS so that it benefits all communities, especially those who are in poorest health. We use a broad definition of health to include physical, mental, social wellbeing and quality of life. Our objectives are to transform systems so that UGBS are planned, developed, implemented, maintained and evaluated with our communities and data systems to enhance health and reduce inequalities. GroundsWell will use interdisciplinary, problem-solving approaches to accelerate and optimise community collaborations among citizens, users, implementers, policymakers and researchers to impact research, policy, practice and active citizenship. GroundsWell will be shaped and developed in three pioneer cities (Belfast, Edinburgh, Liverpool) and their regional contexts, with embedded translational mechanisms to ensure that outputs and impact have UK-wide and international application.

Urban nature and physical activity: Investigating associations using self-reported and accelerometer data and the role of household income.

BACKGROUND: Physical inactivity is a major public health concern. Natural, or semi-natural, environments may encourage physical activity, but the influences of socio-economic factors have been under-researched. METHODS: We explored the associations between meeting physical activity (PA) guidelines and both neighbourhood green (area coverage) and blue (freshwater coverage and coastal proximity) environments for urban adults using data from the Health Survey for England [HSE] (2008/2012). We considered different domains of self-reported PA: walking (n = 18,391), sports and other exercise (n = 18,438), non-recreational (domestic/gardening/occupational; n = 18,446) and all three domains combined (n = 18,447); as well as accelerometer-derived PA data using a subsample (n = 1,774). Relationships were stratified by equivalised household income as an indicator of socio-economic status. RESULTS: After adjusting for covariates, living <5 km from the coast was associated with significantly higher odds of meeting UK 2010 guidelines through self-reported total, walking and non-recreational PA (e.g. total PA, <5 km vs. >20 km, adjusted odds ratio (ORadj) = 1.26; 95% confidence interval (CI) = 1.15-1.39) but unrelated to sports and exercise. Greater neighbourhood greenspace, however, was only associated with significantly higher odds of meeting guidelines through non-recreational PA alone (e.g. 80-100% vs. <20% ORadj = 1.32; 95% CI = 1.12-1.56). Although associations were most consistent in the lowest income quintile, income-related results were mixed. Relationships were not replicated in the smaller accelerometry subsample. CONCLUSION: Our self-report findings for the differing domains of PA as a function of neighbourhood green and blue space broadly replicated previous research, yet the reasons for the observed differences between PA domains and environments remain unclear. We did not observe any associations between environmental variables and accelerometer-measured PA; further research with larger samples is needed.

Energy expenditure on recreational visits to different natural environments.

Physical inactivity poses a significant challenge to physical and mental health. Environmental approaches to tackle physical inactivity have identified natural environments as potentially important public health resources. Despite this, little is known about characteristics of the activity involved when individuals visit different types of natural environment. Using Natural England's Monitor of Engagement with the Natural Environment Survey, we examined 71,603 English respondents' recreational visits to natural environments in the past week. Specifically, we examined the intensity of the activities they undertook on the visits (METs), the duration of their visit, and the associated total energy expenditure (MET minutes). Visits to countryside and urban greenspace environments were associated with more intense activities than visits to coastal environments. However, visits to coastal environments were associated with the most energy expenditure overall due to their relatively long duration. Results differed by the urbanity or rurality of the respondent's residence and also how far respondents travelled to their destination. Knowledge of what types of natural environment afford the highest volumes and intensities of physical activity could inform landscape architecture and exercise prescriptions. Isolating activity-supporting characteristics of natural environments that can be translated into urban design is important in providing physical activity opportunities for those less able to access expansive environments.

Thermal damage assessment of novel bipolar forceps in a sheep model of spinal surgery.

BACKGROUND: Heat transfer from bipolar tips to adjacent tissue presents a risk of thermal injury during spine surgery. OBJECTIVE: The present study was designed to determine wither bipolar forceps using a novel heat pipe thermal regulation technology resulted in decreased collateral thermal injury of adjacent tissue compared with traditional bipolar forceps (control). METHODS: Eight sheep underwent multilevel laminectomy and controlled bipolar coagulation of the dorsal spinal dura mater at multiple levels using forceps with or without heat pipe technology (24 spinal segments tested; heat pipe, n=11; non-heat pipe, n=11; sham, n=2). The severity (range, 1-5) and size of thermal injury to the spinal cord resulting from forceps with vs without heat pipe were assessed via histological analysis at 8 days postoperatively. RESULTS: Macroscopic occlusion of the pial vein underlying the segment of epidural coagulation occurred at surgery in 64% of segments (7 of 11) coagulated with control forceps but did not occur in any segments coagulated with heat pipe forceps (P<.005). The mean width (0.58+/-0.58 vs 1.4+/-0.77 mm; P<.05) and cross-sectional area of unintended thermal injury (1.2+/-1.7 vs 4.9+/-3.2 mm2; P<.05) were decreased in segments treated with heat pipe forceps compared with control. The severity of thermal injury was decreased in segments coagulated with (median, grade 1) vs without (median, grade 3) heat pipe forceps (P<.05). CONCLUSION: Bipolar forceps that incorporate heat pipe technology limited thermal spread and reduced the extent of unintended injury to the spinal cord and collateral vessels.

Evaluation of a new bipolar coagulation forceps in a thermal damage assessment.

OBJECTIVE: To determine whether a novel bipolar forceps device that uses heat-pipe technology to manage tissue temperature would result in less tissue injury compared with a conventional antistick forceps design. METHODS: In ex vivo and in vivo experiments, lesions were compared at generator powers of 35 and 50 Malis units and at 3- and 10-second activation times. For the ex vivo studies, lesions were produced in specimens of fresh calf liver. Tissue temperatures were measured by using thermocouples placed in the tissue and also estimated by obtaining thermal photography. Rats were used for the in vivo studies, in which lesions were produced on the surface of the exposed cerebral hemispheres and assessed by histological examination. The extent of tissue injury was determined for both the ex vivo and in vivo studies. RESULTS: Thermographic and thermometric studies revealed significant tissue temperature reductions at the tips of heat-pipe forceps compared with conventional antistick forceps. In both the ex vivo and in vivo studies, there was less tissue injury produced by the heat-pipe forceps, and this difference was most pronounced with longer activation times. CONCLUSION: Bipolar forceps containing heat pipes more effectively limits excessive thermal spread, thereby potentially reducing the risk of unintended injury to collateral or peripheral tissue.