We live in a wonderful age! Scientists have proven that many simple, affordable, and often enjoyable activities make us healthier and happier: breath fresh air, avoid dangerous driving, be physically active, eat fresh fruits and vegetables, maintain friendships, play games, and avoid excessive stress. Even chocolate, red wine and sex are perscribed, in moderation, for health sake.
One of the most effective public health strategies is to encourage active transportation (walking, cycling, and variants such as roller skating). Although I've worked on this issue for years, I did not fully appreciate the magnitude of these benefits until a couple weeks ago when I participated in a special workshop sponsored by the U.S. Center For Disease Control and Prevention to produce a U.S. version of the Health Economic Assessment Tool (HEAT), a science-based computer model developed by the World Health Organization that calculates the value of health benefits of increased cycling activity. Eventually, we plan to expand it to also include walking health benefits.
This workshop brought together leading researchers on this subject from around the world. (One evening we celebrated our international collaboration by sampling beers from each other's countries at a local bar, but there were far too many to drink in one sitting.) I learned a lot. Current research indicates that regular doses of moderate physical activity provide these benefits:
According to a major study called Physical Activity Guidelines For Americans by the Department of Health and Human Services:
"On average, it appears that compared to less than 0.5 hour per week of moderate-to-vigorous physical activity, engaging in approximately 1.5 hours per week of such activity is associated with about a 20% reduction in risk of all cause mortality. Additional amounts of physical activity are associated with additional risk reductions, but at smaller magnitudes, such that an additional approximately 5.5 hours per week are required to observe a further 20% decline in risk (i.e., approximately 7.0 hours per week is associated with approximately 40% reduction in risk, compared with less than 0.5 hour per week)."
This figure from the Physical Activity Guidelines For Americans report shows the reductions in mortality caused by increases in physical activity. These studies suggest that 15 daily minutes of brisk walking or cycling reduces the risk of dying by 20%, and 60 daily minutes reduces this risk by 40%.
The U.S. currently lags the OECD average lifespan by about one year. This poor health performance can largely be explained by high rates of automobile-dependency, which cause high rates of traffic fatalities and diseases associated with sedentary living, compared with peer countries. Described more positively, transportation and land use planners can help imporve public health and reduce medical costs by creating more walkable and bikable communities, so more people achieve their twenty daily minutes of moderate physical activity during normal local travel.
More active transportation can provide huge savings in lives, disability costs and healthcare expenses. Some recent studies have quantified and monetized (measured in monetary units) these benefits, suitable for use in transportation planning:
This research indicates that health benefits are large compared with other planning objectives, but they tend to be overlooked in conventional transport economic evaluation. A transportation policy or project is worth far more than generally recognized if it increases walking and cycling activity, and far less if it reduces walking and cycling. This has important implications for decisions such as roadway design, traffic calming, investments in sidewalks and paths, and land use policies that affect the amount of nonmotorized travel that occurs in a community.
Of course, improved public health is just one of many benefits that can result from improving walking and cycling conditions. My report, Quantifying the Benefits of Non-Motorized Transport for Achieving TDM Objectives discusses other benefits that should be considered when evaluating planning decisions that affect the amount of walking and cycling that occurs in a community.
For more information:
Active Living by Design (www.activelivingbydesign.org) encourages physical activity and health through community design and public policy strategies.Lars Bo Andersen, et al. (2000), "All-Cause Mortality Associated With Physical Activity During Leisure Time, Work, Sports and Cycling to Work," Archives of Internal Medicine, Vol. 160, No. 11, pp. 1621-1628.
J. Ball, M. Ward, L. Thornley and R. Quigley (2009), Applying Health Impact Assessment To Land Transport Planning, Research Report 375, New Zealand Transport Agency (www.ltsa.govt.nz); at www.ltsa.govt.nz/research/reports/375.pdf.David Bassett, John Pucher, Ralph Buehler, Dixie L. Thompson, and Scott E. Crouter (2008), "Walking, Cycling, and Obesity Rates in Europe, North America, and Australia," Journal of Physical Activity and Health, Vol. 5 (www.humankinetics.com/jpah/journalAbout.cfm), pp. 795-814; at http://policy.rutgers.edu/faculty/pucher/JPAH08.pdf. Judith Bell and Larry Cohen (2009), The Transportation Prescription: Bold New Ideas for Healthy, Equitable Transportation Reform in America, PolicyLink and the Prevention Institute Convergence Partnership (www.convergencepartnership.org/transportationhealthandequity).
Marlon G. Boarnet, Michael Greenwald and Tracy E. McMillan (2008), "Walking, Urban Design, and Health: Toward a Cost-Benefit Analysis Framework," Journal of Planning Education and Research, Vol. 27, No. 3, pp. 341-358; at http://jpe.sagepub.com/cgi/content/abstract/27/3/341.
Nick Cavill, Andy Cope and Angela Kennedy (2009), Valuing Increased Cycling in the Cycling Demonstration Towns, Cycling England, Department for Transport (www.dft.gov.uk); at www.dft.gov.uk/cyclingengland/site/wp-content/uploads/2009/12/valuing-increased-cycling-in-the-cycling-demonstration-towns.pdf.
DHHS (2008), Physical Activity Guidelines For Americans, Physical Activity Guidelines Advisory Committee Report, Department of Health and Human Services (www.health.gov); at www.health.gov/paguidelines/report.
Lawrence Frank, Sarah Kavage and Todd Litman (2006), Promoting Public Health Through Smart Growth: Building Healthier Communities Through Transportation And Land Use Policies, Smart Growth BC (www.smartgrowth.bc.ca); at www.vtpi.org/sgbc_health.pdf.
Jessica Y. Guo and Sasanka Gandavarapu (2010), "An Economic Evaluation Of Health-Promotive Built Environment Changes," Preventive Medicine, Vol. 50, Supplement 1, January 2010, pp. S44-S49; at www.activelivingresearch.org/resourcesearch/journalspecialissues.
Health Economic Assessment Tool (HEAT) for cycling is a science-based computer model developed by the World Health Organization that calculates the human health benefits that result from increased cycling activity (http://euro.who.int/transport/policy/20081219_1).
Sonja Kahlmeier, Francesca Racioppi, Nick Cavill, Harry Rutter, and Pekka Oja (2010), "‘Health in All Policies' in Practice: Guidance and Tools to Quantifying the Health Effects of Cycling and Walking," Journal of Physical Activity and Health, Vol. 7, Supplement 1, pp. S120-S125; at www.euro.who.int/document/E93592.pdf.
Todd Litman (2004), If Health Matters: Integrating Public Health Objectives into Transportation Decision-Making, Victoria Transport Policy Institute (www.vtpi.org); at www.vtpi.org/health.pdf; previously published as, "Integrating Public Health Objectives in Transportation Decision-Making," American Journal of Health Promotion, Vol. 18, No. 1 (www.healthpromotionjournal.com), Sept./Oct. 2003, pp. 103-108; at www.vtpi.org/AJHP-litman.pdf.
Hyangun Sung, Jihyung Park and Hyeja Kim (2009), "A Study on the Impact of the Green Transport Mode on Public Health Improvement," KOTI World-Brief, Vol. 1, No. 1, Korea Transport Institute (www.koti.re.kr), May 2009, pp. 6-8; http://english.koti.re.kr/upload/eng_publication_regular/world-brief01.pdf.