Wikibooks: Exercise as it relates to Disease/Is walking an effective exercise intervention in the prevention of cardiovascular disease in elderly women?

This article is a critical analysis of the following paper Manson J Greenland P LaCroix A. Walking compared with vigorous exercise for the prevention of cardiovascular events in women. ACC Current Journal Review. 2003 12(1) 29 = What is the background to this research? = w Cardiovascular disease (CV...

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Summary:This article is a critical analysis of the following paper Manson J Greenland P LaCroix A. Walking compared with vigorous exercise for the prevention of cardiovascular events in women. ACC Current Journal Review. 2003 12(1) 29 = What is the background to this research? = w Cardiovascular disease (CVD) is one of the leading causes of mortality not only in Australia but also across the globe. Manson J Greenland P LaCroix A. Walking compared with vigorous exercise for the prevention of cardiovascular events in women. ACC Current Journal Review. 2003 12(1) 29. Li J Siegrist J. Physical Activity and Risk of Cardiovascular Disease—A Meta Analysis of Prospective Cohort Studies. International Journal of Environmental Research and Public Health. 2012 9(2) 391 407. Department of Health Cardiovascular disease [Internet]. 2019 [cited 5 September 2019]. Available from https // cardio It is classified as a condition relating to the heart and its surrounding blood vessels. A strong relationship between regular physical activity and the prevention of CVD has been found in a large number of studies. Thompson P Buchner D Piña I Balady G Williams M Marcus B et al. Exercise and Physical Activity in the Prevention and Treatment of Atherosclerotic Cardiovascular Disease. Circulation. 2003 107(24) 3109 3116. Powell K. Physical Activity And The Incidence Of Coronary Heart Disease. Annual Review of Public Health. 1987 8(1) 253 287. Morris J Crawford M. Coronary Heart Disease and Physical Activity of Work. BMJ. 1958 2(5111) 1485 1496. Franco O de Laet C Peeters A et al. Effects of Physical Activity on Life Expectancy With Cardiovascular Disease. Archives of Internal Medicine. 2005 165(20) 2355. Berlin J Colditz G. A meta analysis of physical activity in the prevention of coronary heart disease. American Journal of Epidemiology. 1990 132(4) 612 628. Prevalence data shows that one in six Australians is affected by CVD. Both men and women are equally affected. Foundation T. Cardiovascular disease fact sheet [Internet]. The Heart Foundation. 2019 [cited 9 September 2019]. Available from https // us/what we do/heart disease in australia/cardiovascular disease fact sheet Although only a small amount of research focussed on women at the time. Most physical activity guidelines have focussed on providing recommendations of intensities between moderate and vigorous physical activity without any emphasis on the effects of walking which is recognised as the most common form of exercise in women. Walsh J Rogot Pressman A Cauley J Browner W. Predictors of Physical Activity in Community dwelling Elderly White Women. Journal of General Internal Medicine. 2001 16(11) 721 727. Evaluating the effects of walking on CVD could have a great impact on health in especially elderly women by making PA guidelines more accessible and achievable without the pressure of vigorous activity. Pate R Pratt M Blair S et al. Physical activity and public health. A recommendation from the Centers for Disease Control and Prevention and the American College of Sports Medicine. JAMA The Journal of the American Medical Association. 1995 273(5) 402 407. In addition this study highlights the effect of sedentary behaviour and its contribution to CVD which hasn t been accounted for in previous studies. = Where is the research from? = The research was published in w The New England Journal of Medicine which identifies as the world s leading medical journal and website. About NEJM [Internet]. New England Journal of Medicine. 2019 [cited 9 September 2019]. Available from https // nejm/about nejm?query=footer The study population involved an ethnically and diverse cohort of postmenopausal women who were enrolled in the w Women s Health Initiative . The WHI is an American national health study which aims to develop strategies in preventing major disease factors in postmenopausal women and is highly recognised by the American health care system. WHI WHI Home [Internet]. 2019 [cited 9 September 2019]. Available from https // The main author Dr. JoAnn Manson is a well respected professor of medicine at the Harvard medicine school who s main focus of research is in women s health and chronic disease. JoAnn Manson [Internet]. JoAnn Manson. 2019 [cited 9 September 2019]. Available from https // manson/ As well as one of her co authors Philip Greenland who is a reputable professor of medicine and published well over 400 papers in relation to his focus on cardiovascular epidemiology and prevention. Philip Greenland Faculty Profile Feinberg School of Medicine Northwestern University [Internet]. 2019 [cited 10 September 2019]. Available from https // profiles/az/profile.html?xid=11644 = What kind of research was this? = This research was a prospective study as part of the Women’s health initiative observational study. A large cohort of 73 743 women was observed for an average of 3 years while looking for development of any sign of cardiovascular disease and analysing how this related to other factors of the individual’s lifestyle. Prospective observational studies have high validity and provide high quality data even though a high follow up rate is necessary. The study claims of a follow up rate of 95%. In addition a w prospective cohort study seemed more appropriate than a w retrospective cohort study due to the benefit of being able to target for a specific outcome with less bias. Song J Chung K. Observational Studies Cohort and Case Control Studies. Plastic and Reconstructive Surgery. 2010 126(6) 2234 2242. Observational studies are not controlled and need to take into account any factors that could influence or bias the outcome known as confounders. Carlson M Morrison R. Study Design Precision and Validity in Observational Studies. Journal of Palliative Medicine. 2009 12(1) 77 82. This study used Cox w Proportional hazards model to account for these potential confounding variables such as age smoking BMI etc. Due to the large sample size the follow up rate and duration of this study the methodology seemed appropriate. = What did the research involve? = At baseline all subjects had to be free of any diagnosed cardiovascular disease or cancer. The first screening included self administered questionnaires relating to personal and family medical history and other lifestyle factors that could be of significance. This was followed by repeated physical activity questionnaires that focussed on the type frequency and duration of exercise including information on walking and sedentary behaviour. This data was analysed and calculated into weekly energy expenditure measured in metabolic equivalents for different intensities of physical activity and walking. The end points of this study were classified as newly diagnosed coronary heart disease and total cardiovascular events in individuals which were strictly classified. =Strengths= Large cohort and long term follow up Racial and ethnic diversity End points were classified very accurately and consistently =Limitations= Questionnaires this leads to misclassification and over reporting of physical activity. It is also to consider that different individuals have a different perception of what to classify as moderate and vigorous exercise Usage of standardised classifications of energy expenditure associated with certain activities which remains to be an estimate. Calculating energy expenditure from these estimates won t be as accurate compared to measuring energy expenditure from different sources. Although due to the large sample size it seemed appropriate. = What were the basic results? = The study displayed significant results in the relationship between physical activity and CVD Strong inverse relationship between base line physical activity score and risk of cardiovascular event during the follow up period Similar risk reductions between walking and vigorous physical exercise A combination of both walking and vigorous exercise showed the greatest risk reduction (approximately 0.37 for individuals in the highest energy expenditure quintiles) Greater sedentary behaviour increased the risk factors However the most significant indicator for developing risk factors for CVD was energy expenditure without any relation to the type of activity. Therefore it should be considered that any type of activity as long as it reaches a certain threshold of energy expenditure will very likely be effective in reducing the risk for CVD. = What conclusions can we take from this research? = Both walking and vigorous physical activity seemed to have a similar positive effect on the reduction of risk factors related to CVD. However total energy expenditure is a better indicator of risk reductions in CVD compared to type and intensity of physical activity. Recent studies suggest that even small amounts of exercise are better than none although increasing the amount will have significant benefits on health and preventing CVD. Alves A Viana J Cavalcante S Oliveira N Duarte J Mota J et al. Physical activity in primary and secondary prevention of cardiovascular disease Overview updated. World Journal of Cardiology. 2016 8(10) 575. Carnethon M. Physical Activity and Cardiovascular Disease How Much Is Enough?. American Journal of Lifestyle Medicine. 2009 3(1 suppl) 44S 49S. This study is supporting recent guidelines for Physical activity of recommended 150 minutes of moderate exercise per week. Findings from this study encourage especially elderly women to exercise because of taking away the pressure of having to exercise vigorously. A recent systematic review and meta analysis of randomised control trials also highlights the importance of regular walking in the prevention of cardiovascular disease. Murtagh E Nichols L Mohammed M Holder R Nevill A Murphy M. The effect of walking on risk factors for cardiovascular disease An updated systematic review and meta analysis of randomised control trials. Preventive Medicine. 2015 72 34 43. In addition to overcoming physical inactivity it is important to note that emphasis should also be on reducing sedentary behaviour. In particular recent studies focus on the reduction of sedentary behaviour in the population which is affecting health and CVD significantly. González K Fuentes J Márquez J. Physical Inactivity Sedentary Behavior and Chronic Diseases. Korean Journal of Family Medicine. 2017 38(3) 111. = Practical advice = Adding walking to your physical activity routine will have significant benefits to your health. Not only for the prevention of cardiovascular disease but also on daily life and general health. Warburton D. Health benefits of physical activity the evidence. Canadian Medical Association Journal. 2006 174(6) 801 809. Department of Health Physical Activity [Internet]. 2019 [cited 17 September 2019]. Available from https // activity Physical activity it s important [Internet]. 2019 [cited 17 September 2019]. Available from https // activity its important Tips Some exercise is better than none. Identify preferences for physical activity that YOU enjoy doing(e.g. walking swimming etc.) but be consistent. Integrate increased walking into your lifestyle and break up sedentary patterns. (social walking walking with a destination in mind) If you have any concerns about exercising Consult a professional. See further readings. Start slow and increase duration and intensity over time. = Further information/resources = Visit Heart Foundation. Walking Solo or in a Group. https // Are you at risk for Cardiovascular disease? Find out. https // professionals/clinical information/absolute risk Physical Activity Fact Sheet. Get Active. https // living/get active Adult Pre Exercise Screening Tool. https // ESSA/Adult Pre Screening Tool.aspx Find Exercise Professionals near you https // aep = References = Reflist BookCat