4World Health Organization. Global status report on noncommunicable diseases 2010 [ EB/OL]. [ 2012-02-10 ]. http://www, who. intY nmh/publications/ncd_report2010/zh/,.
5World Health Organization. Global strategy on diet, physical activi- ty and health. WHA57.17. 2004[EB/OL]. [2012-02-10]. http ://www. who. int/dietphysicalaetivity/strategy/eb11344/strategyenglish_web, pdf.
6U.S. Department of Health & Human Services. 2008 physical activity guidelines for Americans[ EB/0L]. [2012-02-10]. http:// www. health, gov/paguidelines/guidelines/default, aspx.
7Department of Health, Physical Activity, Health Improvement and Prevention. At least five a week : evidence on the impact of physi- cal activity and its relationship to health [ EB/OL]. [ 2011-11-30]. http://www, dh. gov. uk/en/Publicationsandstatistics/Pub- lications/PublieationsPolicyAndGuidance/DH_4080994.
8Australian Government Department of Health and Aging. Australia's physical activity recommendations for 12 -18 year olds [ EB/ OL]. [2011-11-30]. http://www, health, act. gov. au/e/health? a = sendfile&ft = p&fid =-225689077&sial.
