Geography 3432 Environment and Health The Built Environment and Health (Frank et al. Chapters 1 and 3) • • • • Discussion Frank et al. Model Physical activity and health Suburbanization and design Nov 2, 2011, 11:00 a.m. Geog 3432 1 Discussion • How does the built environment effect health? • What specifically is the focus of Frank et al.? Nov 2, 2011, 11:00 a.m. Geog 3432 2 Frank et al.’s Framework: Nov 2, 2011, 11:00 a.m. Geog 3432 3 Elaboration of Framework • Built environment – where we live and work • Public health – outcomes, e.g., obesity, heart disease, stress • Activity patterns – esp. walking bicycling • Land use – e.g., proximity home, work school • Design – small scale features that influence how people feel about an urban “environment” • Transportation systems – esp. for walking, biking, driving, public transit Nov 2, 2011, 11:00 a.m. Geog 3432 4 Health Patterns • “Premature” death (e.g. cardiovascular disease) and disability (e.g., osteoporosis) from preventable diseases • Obesity increasing – risk factor for all sorts of illness/disease • Many health risks decrease with increased physical activity Nov 2, 2011, 11:00 a.m. Geog 3432 5 Causes of Death • note the causes that disappear in later period Nov 2, 2011, 11:00 a.m. Geog 3432 6 Obesity Overweight • 1 category above normal Body Mass Index (based on height:weight ratio) Obese • 2 categories above Prevalence • 1999-2000 CDC study – US 31% obese, 34% overweight = 65% above “normal” Nov 2, 2011, 11:00 a.m. Geog 3432 7 Obesity Patterns • increasing over time Causes of “Obesity” • diet • activity Nov 2, 2011, 11:00 a.m. Geog 3432 8 20 Minute Workout? • 80s – early 90s 20 minutes vigorous exercise • 1996 US Surgeon General report – 30 minutes of moderate activity on most days Nov 2, 2011, 11:00 a.m. 1980s aerobics tv show “The 20 Minute Workout” Geog 3432 9 Moderate Activity Benefits • Muscle strength • Blood pressure – e.g., Reduction risk coronary heart disease on par with stopping smoking! • • • • • Depression and anxiety Obesity Skeletal development of kids Bone density adults Independence (esp. elderly) Nov 2, 2011, 11:00 a.m. Geog 3432 10 Guideline: Active • moderate-intensity physical activity for at least 30 minutes on 5 or more days of the week or OR • vigorous-intensity physical activity 3 or more days of the week for 20 or more minutes Nov 2, 2011, 11:00 a.m. Geog 3432 11 Sedentary Reap New Benefits Quickest Nov 2, 2011, 11:00 a.m. Geog 3432 12 Modifiable Behaviours and Mortality Nov 2, 2011, 11:00 a.m. Geog 3432 13 Improve How Much? • If half “sedentary” population became irregularly active (not quite guideline) total # deaths drop by: – CHD 3.9% – Colon cancer 2.5% – Diabetes 1.5% • If same population met activity guidelines: – CHD drop 7.1% – Colon cancer drop 7.4% – Diabetes 5.2% Nov 2, 2011, 11:00 a.m. Geog 3432 14 Genetics or physical activity • Maybe premature death/disability is mostly genetic? Nov 2, 2011, 11:00 a.m. Geog 3432 15 Genetics or physical activity Nov 2, 2011, 11:00 a.m. Geog 3432 16 Improvements in Physical Activity Over Time? Nov 2, 2011, 11:00 a.m. Geog 3432 17 Discussion • What explains low physical activity in North America? Nov 2, 2011, 11:00 a.m. Geog 3432 18 Interconnected Causes of Sedentary Lifestyles • Behavioural – “victim blaming” – choice available, e.g., transportation • Suburbanization – landuse – design • Time – what happened to the 35hr work week? • Wealth – very much so Nov 2, 2011, 11:00 a.m. Geog 3432 19 Physical Activity and Wealth Nov 2, 2011, 11:00 a.m. Geog 3432 20 Is suburbanization bad for your health? Garden Cities • started late 1800s • reaction to overcrowded and dirty large cities • access to nature (healthy) • best aspects of rural and urban living Nov 2, 2011, 11:00 a.m. Geog 3432 21 Garden Cities vs Industrial Cities Philadelphia first half 20th C (Source) Hagerstown, MD 2010 (Source) Other Examples of Cities/Suburbs Inspired by the Garden City Movement •Shaker Heights, Ohio •Kapuskasing, Ontario Nov 2, 2011, 11:00 a.m. Geog 3432 22 Full Circle • Olmstead – designer (Central Park), architect, writer – advocate for residential outside CBD – space, greenery – CBD too crowed, stressful and generally unhealthy • Levittown NY and PA – post war American (and Canadian) dream – first “suburbs” – entire communities – traffic calming Nov 2, 2011, 11:00 a.m. Geog 3432 23 Transportation: Modal “Choice” Nov 2, 2011, 11:00 a.m. Geog 3432 24 Transportation: Children and Modal Choice Nov 2, 2011, 11:00 a.m. Geog 3432 25 Transportation: Children and Modal Choice Nov 2, 2011, 11:00 a.m. Geog 3432 26 What’s the Epidemiologic Evidence? • Many studies show significant but weak relationships between measures like “sprawl”, “walkability” etc. and “activity”, “overweight/obese”, “depression”, “alcohol abuse” (Renalds et al. 2010 A systematic review of built environment and health, Family and Community Health, 33(1): 68-78) • most use ecologic or case-control study design (what does this imply?) Nov 2, 2011, 11:00 a.m. Geog 3432 27 Discussion • How can we increase physical activity (not personally per se, but as a public health problem)? Nov 2, 2011, 11:00 a.m. Geog 3432 28 Design Barriers Nov 2, 2011, 11:00 a.m. Geog 3432 29 Design Barriers Nov 2, 2011, 11:00 a.m. Geog 3432 30 Designing for Pedestrians Nov 2, 2011, 11:00 a.m. Geog 3432 31 Exercise/Conclusion • Do we need to sacrafice the American/Canadian dream to achieve walkable/cyclable cities? Nov 2, 2011, 11:00 a.m. Geog 3432 32