Services on Demand
Print version ISSN 1516-3180
Sao Paulo Med. J. vol.125 no.2 São Paulo Mar. 2007
O papel do aconselhamento médico para aumentar a adesão à atividade física na população
Marcos Ausenka Ribeiro; Milton de Arruda Martins; Celso Ricardo Fernandes Carvalho
Health Promotion Center, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
The regular practice of physical activity at appropriate levels ensures various benefits for the individual over the short, medium and long terms. It is therefore important in health promotion. On the other hand, sedentary behavior has reached alarming levels among the general population, which qualifies it as a serious health problem of endemic proportions. The present review describes public health problems consequent to sedentary behavior and the importance of physician counseling for change their patients beha-vior and making them more physically active on a regular basis. Models and behavioral theories are presented to facilitate physicians understan-ding of how to approach patients during clinical practice. We also describe programs conducted in many countries based on physician counseling for reducing sedentary behavior, and we present many tools used to quantify and qualify patients attitudes towards becoming more physically active. Through understanding the barriers faced by patients, we suggest methodologies that will enable physicians to use physical activity promotion appropriately. We hope that this will provide support for physicians in conducting physical activity counseling, as a means for improving the health of the population.
Key words: Physical activity. Exercise. Behavioral medicine. Health promotion. Internal medicine.
A prática regular de atividade física em níveis adequados assegura diversos benefícios para o indivíduo a curto, médio e longo prazo, o que determina sua importância na promoção de saúde. Por outro lado, o sedentarismo tem atingido níveis alarmantes na população em geral qualificando-o como um problema grave da saúde em proporções endêmicas. O médico, assim como outros profissionais da saúde, deveriam estar atentos a este fato e promover a prática da atividade física durante a sua prática clínica. Entretanto, existem evidências sugerindo que o aconselhamento de atividade física tem sido realizado pelo médico, principalmente, para pacientes que apresentam co-morbidades sugerindo o seu uso como uma ferramenta terapêutica ao invés de preventivo. O objetivo desta revisão foi auxiliar os médicos a compreender os benefícios preventivos da atividade física, subsidiando-os sobre as teorias comportamentais e provendo-os com ferramentas para avaliar e aconselhar os pacientes adequadamente sobre os assuntos relacionados à atividade física. Além disto, compreendendo as barreiras enfrentadas pelos pacientes, esperamos sugerir metodologias que auxiliarão médicos a empregar a promoção da atividade física de maneira adequada. Esperamos, desta forma, auxiliar o médico a utilizar o aconselhamento como um instrumento para promover a saúde da população.
Palavras-chave: Atividade física. Exercício. Medicina do comportamento. Promoção da saúde. Clínica geral.
SEDENTARY BEHAVIROR AS A PUBLIC HEALTH PROBLEM
There are increasing numbers of studies showing the benefits of regular physical activity in preventing diseases and promoting health.1,2 The known benefits of physical activity include the prevention of heart disease,3 stroke,4 hypertension,5,6 type II diabetes mellitus,7,8 hypercholesterolemia,9,10 obesity,11,12 lung cancer,13,14 breast cancer,15 colon cancer16 and rectal cancer.17 It also provides improvements in psychological function,18,19 cognitive function,20 sleep quality and lower back pain symptoms.21 Consequently, health officials in many countries designated the year 2000 for achieving reduced levels of sedentary behavior as the primary target of programs aimed at decreasing the prevalence of risk factors for non-communicable diseases.1,2
Among the American population, 68% of individuals do not exercise at the levels recommended for obtaining benefits from physical activity.22 The prevalence of this sedentary behavior is even higher among elderly individuals living in urban centers, especially if they are of low socioeconomic status and receive primary care in public health clinics.23 Similar data have been reported in São Paulo city, where 69.3% of the population aged 15 to 59 is sedentary. This proportion is higher than for smoking (37.9%), hypertension (33.3%), obesity (18%) or diabetes mellitus (6.9%),24 thus suggesting that sedentary behavior is the most prevalent risk factor for non-communicable diseases among the Brazilian population and should be considered to be a public health problem of endemic proportions.
PHYSICIANS AS PHYSICAL ACTIVITY COUNSELORS
All health professionals should counsel their patients to engage in physical activity. Visits to the doctor represent very convenient opportunities for such counseling, because of the trust that patients place in their physicians.25 In Brazil, it has been found that 54.7% of individuals, and particularly women and the elderly, say they have visited their doctor within the last 12 months.26 In addition, 71.2% of the population use healthcare services regularly, among whom low-income individuals seek treatment primarily in public health clinics (41.8%) or hospital outpatient clinics (21.5%).26
In the United States, physical activity recommendations made by physicians have been systematized. Healthy People 201027 and the United States Preventive Services Task Force28 recommend that doctors and other health professionals include such counseling in all medical appointments. Nevertheless, this is not common practice for most physicians. Some studies suggest that only 22% to 48% of the elderly receive some form of counseling regarding physical activity during medical appointments.29 During check-up visits, 56% of patients are asked about their physical activity, but only 34%30 receive any counseling.31 On the other hand, physical activity counseling seems to be given more often to those with more risk factors or comorbidities, which suggests greater use of such counseling as a therapeutic tool rather than for promoting health.32
Physicians report various reasons for not providing medical counseling, or claim that there are barriers to giving such counseling. Among these are lack of training, lack of confidence in the effectiveness of counseling, lack of support from the sponsoring institution, little time for counseling during visits, and little or no reimbursement for preventive measures.33 Another possible explanation for such attitudes may be related to the fact that physical activity may cause injury or worsen clinical conditions such as peripheral arterial disease, osteoporosis, asthma, coronary disease, hypertension, and diabetes mellitus. Therefore, physicians have been working as "gatekeepers" for physical activity, by establishing which patients are able to engage in physical activity, rather than acting as "stimulators" for promoting healthy behavior among the population.
The objectives of the present review were: (i) to increase physicians' knowledge of the recommended minimum levels of physical activity for achieve benefi ts from such activities; (ii) to detail the barriers faced by patients in adhering to any program of regular physical activity; and (iii) to aid physicians in providing physical activity counseling to patients during medical visits.
PRESCRIBING PHYSICAL ACTIVITY
The majority of the adult population do not need to see a physician2 or undergo ergometric stress tests. The need to use such tests before beginning physical activity programs of moderate intensity remains controversial.34 The American College of Sports Medicine recommends the use of ergometric stress tests before beginning high-intensity physical activity programs, but only for males over the age of 45, females over 55 and individuals presenting chronic diseases or more than one risk factor for chronic cardiovascular disease.35 On the other hand, the American Heart Association and the American College of Cardiology classify ergometric stress test requirements or specifi c tests under physician supervision as class IIb, meaning that their efficacy has not yet been well established,36 unless for individuals diagnosed with heart disease or for those choosing to begin programs of vigorous physical activity. Therefore, questionnaires such as the Physical Activity Readiness Questionnaire (PAR-Q)37,38 are considered sufficient for analyzing individuals' readiness to begin physical activity of moderate intensity or indicating any requirement for further specific examinations or tests when an intense or more specific physical activity program is planned (Table 1).
Twenty minutes of physical activity of moderate to vigorous intensity based on heart rate (60% to 85%) or maximal oxygen consumption (50% to 80%) performed three times a week has traditionally been prescribed for improving fitness.39 However, this recommendation has been based on studies that aimed to investigate dose-response effects for improving fitness following endurance exercise programs, especially with regard to maximal aerobic capacity.2 It is currently known that at least 30 minutes of moderate physical activity per day, like walking fast (5.0 to 7.0 km/h), cycling as a transportation method (< 15 km/h), mo-derate swimming, or calisthenic exercises, is ne-cessary for preventive purposes. These activities must be practiced for at least 30 minutes on five days per week.2 Patients can also be counseled to perform 30 minutes of exercises conti-nuously or divide them into two daily 15-minute sessions, or three daily 10-minute sessions (accumulated activity).40
Participation in programs of aerobic physical activity based on cardiopulmonary capacity for as little as three months enhances individuals physical ability over the short-term. However, in contrast to what is commonly hypothesized, it does not ensure that these individuals will incorporate such changes into their lifestyles and maintain these levels of activity on a medium-term basis. There is evidence suggesting that, for healthy sedentary individuals, undergoing intervention programs based on changes in daily habits is as effective as structured programs of physical aerobic exercise, and that both types of program lead to increased levels of physical activity and cardiorespiratory fitness, reduced arterial pressure, and lowered body fat percentages after 24 months. These data suggest that counseling to change daily routines is an important strategy and brings significant benefits for sedentary individuals who typically face many barriers to starting or maintaining traditional programs of physical activity.41
Among obese women, adherence to physical activity programs designed to reduce overall body weight that are based on accumulated activities over the course of the day is greater than for continuous physical activity programs.42 These findings have been confirmed by others.43 Moreover, from a preventive point of view, more benefits are obtained by increa-sing physical activity levels from sedentary to moderately active than from increasing from moderately active to highly active levels.44
Based on these findings, the Centers for Disease Control and the American College of Sports Medicine have revised their physical activity guidelines for the general population and now state that "every adult should accumulate at least 30 minutes of light to moderate intensity physical activity on most days of the week". The World Health Organization and the American Heart Association have endorsed this recommendation.2 A review of this position statement has revealed that such programs yield real benefits only when practiced at a frequency of at least five days a week. Additional twice-weekly sessions invol-ving other types of exercise, such as flexibility, strength and muscle endurance, may bring further benefits. The results from another study have demonstrated that individuals wishing to control or reduce their body weight need to gradually increase total exercise time to 60 minutes per day.45
MODELS AND BEHAVIORAL THEORIES
One of the difficulties in modifying patients lifestyles that health professionals face (inclu-ding physicians) is a lack of knowledge regarding techniques, models and theories that would aid in changing their behavior.46 Among the most commonly used models and theories for interventions aimed at physical activity practice are the social cognitive theory47 and the transtheoretical (or stages of behavior) model.48
The social cognitive theory proposes that there are multiple influences on human behavior and emphasizes that changes should be in social and cognitive factors. One goal of the social cognitive theory is to increase the individuals self-efficacy. Self-efficacy is part of cognitive control and its objective is to make the individual confident enough to initiate and maintain specific behavioral changes. A number of studies have supported the hypothesis that self-efficacy is directly correlated with remaining physically active.49 There are four mechanisms for affec-ting self-efficacy: verbal persuasion, exchanging personal experiences, reporting activities engaged in, and understanding physiological changes or benefits.50 There are a number of techniques used in interventions based on the social cognitive theory. These techniques include self-monito-ring, defining goals, self-effort, analysis of the pros and cons for behavioral change, changes in dialog, prevention of relapses in behavioral changes and social support.47
The transtheoretical model allows the individuals behavioral stage to be determined on the basis of his intention to maintain or to change a specific behavioral trait.48 This model was developed in order to evaluate smoking behavior and was subsequently adapted to other lifestyle-related behavioral patterns, such as physical activity levels.51 This behavioral model proposes that individuals present five different behavioral or motivational stages regarding physical activity. In the first stage (pre-contemplation), the individual does not practice any physical activity and does not have any intention of doing so. In the second stage (contemplation), the individual does not practice any program of physical activity, but considers doing so. In the third stage (preparation) the individual is considering engaging in physical activity or is already engaged, although not at the recommended levels. In the fourth stage (action), the individual has already engaged in physical activities that are within the recommended parameters, but for a period of less than six months. In the final stage (maintenance), the individual is engaged in physical activities at the recommended levels and has maintained these levels for more than six months.51,52
Marcus et al.53 developed a questionnaire to evaluate specific behavioral stages for physical activity (Table 2). Physical activity counseling using this behavioral model is aimed at stimulating an ascendant process in patients behavioral stages, through well-defined and specific strategies that make individuals become increasingly active over time.51,52 For instance, if an individual is in the pre-contemplation stage, physician counseling must consist of explaining to the patient the benefits of becoming physically active and identifying barriers that might prevent the individual from initiating a behavioral change. Table 3 shows a list of strategies suggested for each behavioral stage.52
BARRIERS TO PHYSICAL ACTIVITY PRACTICE
One of the most important aspects of physical activity counseling is to understand patients barriers to changing their behavioral stage. Barriers to physical activity practice may be categorized as demographic, psychological, behavioral, sociocultural or environmental, or may be related to the physical activity itself.54 It has been shown that age is inversely correlated with physical activity levels and that men tend to be more physically active than women.46 There is also evidence that the perceived barriers vary according to age, social class and socioeconomic level.46,55
In the United Kingdom, 47% of men and 51% of women reported "lack of leisure time" as the main factor for non-adherence to physical activity programs, and 46% of men and 48% of women reported "lack of motivation".55 These perceived barriers seemed to differ according to environment, age and gender. In Brazil, women less than 45 years of age who were in the contemplation behavioral stage reported "lack of time", "lack of knowledge", "lack of discipline" and "lack of equipment" as the most frequent barriers for not adhering to any physical activity.56 The barriers seemed to differ between people living in smaller and larger cities. Among men from larger cities (> 500,000 inhabitants), the most frequent barriers reported were "lack of equipment", "lack of time", "lack of knowledge", "fear of physical injury" and "need to relax", whereas similar populations from smaller cities (< 500,000 inhabitants) reported that the barriers were "lack of equipment", "lack of appropriate location", "lack of ability", "weather conditions" and "need to relax".57 On the other hand, the main barrier to adherence to physical activity programs reported among sedentary college students in São Paulo was "lack of time".58
Investigation of the influence of environmental factors on physical activity behavior has been limited to analysis of the characteristics of the natural environmental (changes in weather and location) within which individuals perform such activities. Little is known about the influence of urban and suburban structures (buildings, transport systems and passive entertainment). At present, one of the most promising behavioral models for intervening in relation to individuals adherence to physical activity practice is the ecological model, which aims to understand how the environment influences individuals decisions to practice or not practice activities.59
After perceived barriers have been identified, there are various approaches towards interventions. If the barriers reported are objective, like "lack of equipment", advice to change the social and physical environment is more strongly recommended. However, if the barriers mentioned are subjective, like "lack of time", interventions relating to individual behavior are suggested.46 Physical activity counseling should be planned on the basis of individuals realities and should avoid costs for most of these activities, since this could be perceived as the first barrier to adherence. Furthermore, depending on the target population, it is suggested that physicians give examples of locations for practicing physical activity, such as parks and squares, since lack of awareness of the existence of such locations has been reported as another determinant for non-adherence.60
PROGRAMS BASED ON PHYSICIAN COUNSELING
Medical training has always focused on relieving patients suffering through treating their diseases, whereas disease prevention has been delegated to public health authorities. Over recent years, physicians have gradually been accepting the principle of advising their patients to increase their frequency of physical activity as a preventive strategy. Many countries have been developing programs that focus on intensifying physical activity counseling during medical treatment.61-65
The Physician-Based Assessment and Counseling for Exercise (PACE) project is a physical activity counseling program based on medical sessions in primary-care hospitals, in which the guidance begins by identifying the behavioral stage.61,62 The program guidelines suggest three to five minutes of counseling per medical visit, during which topics of relevance to the patient are discussed and physical activity goals are established. The program consists of three stages: "getting out of the chair" (pre-contemplation), "planning the first steps" (contemplation) and "keeping the PACE" (active). For patients in the pre-contemplation stage, counseling is initially given by summarizing the general and specific benefits of physical activity. In this stage, the patient identifies possible barriers to beginning a physical activity program, and the counselor gives clear instructions on how to begin such a program. Patients in the second stage (contemplation) are asked to identify the kind of physical activity they would like to practice, as well as how, where and for how long they would practice it. The physician reviews the goals established by the patient and modifies them in order to make these goals more realistic for the patient and to identify the main sources of social support. When the plan of action and these goals have been identified, the physician and the patient sign the protocol that will be tested for two weeks.61,62 For individuals in the third stage (active), the physician praises the patient for adhering to the program, reviews goals and aids the patient to avoid possible relapses. In addition, the physician assesses the sources of social support, identifies possible barriers to physical activity and helps the patient find ways to overcome these barriers, thereby demonstrating confidence that the patient will maintain adherence to the physical activity program.61,62
The Physically Active for Life (PAL) project was developed in order to reduce sedentary behavior among elderly adults.63 Like the Physician-Based Assessment and Counseling for Exercise project, the PAL model was developed in primary-care clinics and uses the transtheoretical model for behavioral change and health education, with the aim of overcoming barriers to physical activity. The PAL model integrates cognitive, attitudinal, instrumental, behavioral and social characteristics in an approach centered on patient education. This is done using a series of questions and statements based on the "five As" (agenda, assessment, accompaniment, advice and arrangement of follow-up evaluations). The intervention uses a five-section manual that is organized by color (one for each behavioral stage), showing the pros and cons and giving tips for initiating and maintaining physical activity. After schedu-ling the follow-up visit with the physician at the primary-care clinic, patients receive four monthly mailings, the first including a copy of the manual and the other three containing bulletins with specific information on physical activity.
The Activity Counseling Trial (ACT) is a multicenter randomized clinical trial focusing on comparisons between different physical activity counseling approaches within the primary-care context. The main goal of the ACT is to create care providers within primary care that have a realistic clinical approach, which could overcome many of the barriers faced by physicians in patient counseling.64 In the intervention approach developed by the ACT, the patient receives physician counseling consisting of three key strategies, which the physician uses during the medical appointment: assessment, advice and referral. One study observed that, independent of quantity and type of visits, medical counseling (physician advice and written educational materials) was equally effective in improving cardiorespiratory fitness among women over a two-year period. On the other hand, this approach was no more effective than recommended care among men.65 Another study evaluated healthcare adherence based on the ACT protocol delivered by means of initial physician counseling that aimed to improve physical activity levels and determine providers satisfaction. It was observed that the physicians incorporated brief physical activity advice into routine primary care visits.66
Despite evidence showing the benefits of physical activity, Brazil has no national public policy for promoting physical activity. However, there is a program that disseminates information and acts on the basis of a partnership system coordinated by an entity called Agita São Paulo. The merit of this program has been internationally recognized.67 On the other hand, national intervention based on individuals is required, in order to complement and empower this approach.
HOW TO GIVE PHYSICAL ACTIVITY COUNSELING
The terms "counseling" and "guidance" are often used interchangeably. However, there is a real difference between them. Guidance requires less time and may simply involve making a recommendation, whereas counseling is an interactive and deeper relationship that requires appropriate preparation and training.68 Counseling may be a combination of intervention strategies that involve multiple guidance sessions at follow-up visits to a referral outpatient clinic.69,70
Since there is evidence suggesting that physician counseling on physical activity is effective,71 it is necessary to establish criteria for doing this. The physician has to become aware of the fact that each counseling session increases the level of physical activity on a short-term basis, thereby preparing the patient to initiate the activity (changing the stage of readiness).72 Relapses occur over the medium and long term, and this indicates that counseling should be a constant process of clinical monitoring, rather than being given at a single medical visit. Physician counseling involves taking the attitude of a catalyst for achieving sustained behavioral change within an integrated model for disease prevention programs. It should also include the use of additional information and coordinated reinforcement services for such recommendations. There are various tools that can improve counseling effectiveness. One possible tool is to provide patients with printed material containing all the verbal instructions given.73,74 Instructional materials should be made available so that the patient will remember the information and share it with friends and relatives.75 Such materials should contain personalized instructions, which will increase the likelihood that they will be read, discussed and memorized.76 It is essential that all written information should be given when the patient shows a good degree of "attention and alertness", since this facilitates adherence to the recommendations.75 This is a technique endorsed by communication and information processing theories, in which attention is considered to be an important precursor for behavioral change.77
There is no single well-defined protocol for evaluating and counseling physical activity.61-66 Tables 4 and 5 show a list of strategies suggested that could be used during the first and subsequent medical appointments. There are several strategies for enhancing adherence to physical acti- vity plans. These include programs invol-ving the public, group and individual advice, and electronic dissemination of material in order to meet individual needs.78 However, this is not a simple task since, despite these efforts, even developed countries have failed to reach their intended goals.
These strategies could also be used by other health professionals. However, at this moment, there is a broad array of evidence suggesting that physical activity counseling based on physicians seems to be more effective. Multiprofessional approaches seem to be a better way of obtaining long-term adherence to physical activity practice.
There is a considerable body of evidence supporting the need to increase the use of physical activity counseling for the general population, in order to promote better health. Physical activity counseling given by physicians could provide very important support for this, and we have presented some tools and strategies for such counseling.
1. Physical activity and cardiovascular health. NIH Consensus Development Panel on Physical Activity and Cardiovascular Health. JAMA. 1996;276(3):241-6. [ Links ]
2. Pate RR, Pratt M, Blair SN, 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. 1995;273(5):402-7. [ Links ]
3. Lee IM, Sesso HD, Oguma Y, Paffenbarger RS Jr. Relative intensity of physical activity and risk of coronary hearth disease. Circulation. 2003;107(8):1110-6. [ Links ]
4. Lee CD, Folsom AR, Blair SN. Physical activity and stroke risk: a meta-analysis. Stroke. 2003;34(10):2475-81. [ Links ]
5. Whelton SP, Chin A, Xin X, He J. Effect of aerobic exercise on blood pressure: a meta-analysis of randomized, controlled trials. Ann Intern Med. 2002;136(7):493-503. [ Links ]
6. Hu G, Barengo, NC, Tuomilehto J, Lakka TA, Nissinen A, Jousilahti P. Relationship of physical activity and body mass index to the risk of hypertension: a prospective study in Finland. Hypertension. 2004;43(1):25-30. [ Links ]
7. Knowler WC, Barrett-Connor E, Fowler SE, et al. Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. N Engl J Med. 2002;346(6):393-403. [ Links ]
8. Duncan GE, Perri MG, Theriaque DW, Hutson AD, Eckel RH, Stacpoole PW. Exercise training, without weight loss, increases insulin sensitivity and postheparin plasma lipase activity in previously sedentary adults. Diabetes Care. 2003;26(3):557-62. [ Links ]
9. Berman DM, Rogus EM, Busby-Whitehead MJ, Katzel LI, Goldberg AP. Predictors of adipose tissue lipoprotein lipase in middle-age and older men: relationship to leptin and obesity, but not cardiovascular fitness. Metabolism. 1999;48(2):183-9. [ Links ]
10. Carroll S, Dudfield M. What is the relationship between exercise and metabolic abnormalities? A review of the metabolic syndrome. Sports Med. 2004;34(6):371-418. [ Links ]
11. Donnelly JE, Hill JO, Jacobsen DJ, et al. Effects of 16-month randomized controlled exercise trial on body weight and composition in young, overweight men and women: the Midwest Exercise Trial. Arch Intern Med. 2003;163(11):1343-50. [ Links ]
12. Jakicic JM, Marcus BH, Gallagher KI, Napolitano M, Lang W. Effect of exercise duration and intensity on weight in overweight, sedentary women: a randomized trial. JAMA. 2003;290(10):1323-30. [ Links ]
13. Lee IM, Sesso HD, Paffenbarger RS Jr. Physical activity and risk of lung cancer. Int J Epidemiol. 1999;28(4):620-5. [ Links ]
14. Mao Y, Pan S, Wen SW, Johnson KC; Canadian Cancer Registries Epidemiology Research Group. Physical activity and the risk of lung cancer in Canada. Am J Epidemiol. 2003;158(6):564-75. [ Links ]
15. McTiernan A, Kooperberg C, White E, et al. Recreation physical activity and the risk of breast cancer in postmenopausal women: the Womens Health Initiative Cohort Study. JAMA. 2003;290(10):1331-6. [ Links ]
16. Hou L, Ji B, Blair A, Dai Q, Gao YT, Chow WH. Commuting physical activity and risk of colon cancer in Shanghai, China. Am J Epidemiol. 2004;160(9):860-7. [ Links ]
17. Slattery ML. Physical activity and colorectal cancer. Sports Med. 2004;34(4):239-52. [ Links ]
18. Greist JH. Exercise intervention with depressed outpatients. In: Morgan WP, Goldston SE, editors. Exercise and mental health. Washington: Hemisphere; 1987. p. 117-21. [ Links ]
19. Strawbridge WJ, Deleger S, Roberts RE, Kaplan GA. Physical activity reduces the risk of subsequent depression for older adults. Am J Epidemiol. 2002;156(4):328-34. [ Links ]
20. Barnes DE, Yaffe K, Satariano WA, Tager IB. A longitudinal study of cardiorespiratory fitness and cognitive function in healthy older adults. J Am Geriatr Soc. 2003;51(4):459-65. [ Links ]
21. U.S. Department of Health and Human Services. Physical activity and health: a report of the Surgeon General. Atlanta: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion; 1996. Available from URL: http://www.cdc.gov/nccdphp/sgr/sgr.htm. Accessed in 2007 (Feb 21). [ Links ]
22. Ainsworth BE, Macera CA. Physical inactivity. In: Brownson RC, Remington PL, Davis JR, editors. Chronic disease epidemiology and control. Washington: American Public Health Association; 1998. p. 191-213. [ Links ]
23. Clark DO. Physical activity and its correlates among urban primary care patients aged 55 years or older. J Gerontol B Psychol Sci Soc Sci. 1999;54(1):S41-8. [ Links ]
24. Rego RA, Berardo FA, Rodrigues SS, et al. Fatores de risco para doenças crônicas näo-transmissíveis: inquérito domiciliar no município de São Paulo, SP (Brasil). Metodologia e resultados preliminares. [Risk factors for chronic non-communicable diseases: a domiciliary survey in the municipality of São Paulo, SP (Brazil). Methodology and preliminary results]. Rev Saude Publica. 1990;24(4):277-85. [ Links ]
25. Lewis BS, Lynch WD. The effect of physician advice on exercise behavior. Prev Med. 1993;22(1):110-21. [ Links ]
26. Brasil. Ministério do Planejamento, Orçamento e Gestão. Instituto Brasileiro de Geografia e Estatística. Pesquisa nacional por amostra de domicílios. Acesso e utilização de serviços de saúde. Available from: http://www.ibge.gov.br/home/estatistica/populacao/trabalhoerendimento/ pnad98/saude/default.shtm. Accessed in 2007 (Feb 21). [ Links ]
27. US Department of Health and Human Services. Healthy People 2010: Understanding and improving health. Washington, DC: US Government Printing Office; 2000. Available from URL: http://www.healthypeople.gov/Document/tableofcontents.htm#under. Accessed in 2007 (Mar 16). [ Links ]
29. Damush TM, Stewart AL, Mills KM, King AC, Ritter PL. Prevalence and correlates of physician recommendations to exercise among older adults. J Gerontol A Biol Sci Med Sci. 1999;54(8):M423-7. [ Links ]
30. Wee CC, McCarthy EP, Davis RB, Phillips RS. Physician counseling about exercise. JAMA. 1999;282(16):1583-8. [ Links ]
31. Nawaz H, Adams ML, Katz DL. Physician-patient interactions regarding diet, exercise, and smoking. Prev Med. 2000;31(6):652-7. [ Links ]
32. Kreuter MW, Scharff DP, Brennan LK, Lukwago SN. Physician recommendations for diet and physical activity: which patients get advised to change? Prev Med. 1997;26(6):825-33. [ Links ]
33. Wechsler H, Levine S, Idelson RK, Rohman M, Taylor JO. The physicians role in health promotion--a survey of primary-care practitioners. N Engl J Med. 1983;308(2):97-100. [ Links ]
34. Thompson PD, Buchner D, Pina IL, et al. Exercise and physical activity in the prevention and treatment of atherosclerotic cardiovascular disease: a statement from the Council on Clinical Cardiology (Subcommittee on Exercise, Rehabilitation, and Prevention) and the Council on Nutrition, Physical Activity, and Metabolism (Subcommittee on Physical Activity). Circulation. 2003;107(24):3109-16. [ Links ]
35. American College of Sports Medicine. Guidelines for exercise testing and prescription. 4th ed. Philadelphia: Lea & Febiger; 1991. [ Links ]
36. Gibbons RJ, Balady GJ, Beasley JW, et al. ACC/AHA Guidelines for Exercise Testing. A report of the American College of Cardiology/American Hearth Association Task Force on Practice Guidelines (Committee on Exercise Testing). J Am Coll Cardiol. 1997;30(1):260-311. [ Links ]
37. American College of Sports Medicine Position Stand and American Heart Association. Recommendations for cardiovascular screening, staffing, and emergency policies at health/fitness facilities. Med Sci Sports Exerc. 1998;30(6):1009-18. [ Links ]
38. Thomas S, Reading J, Shephard RJ. Revision of the Physical Activity Readiness Questionnaire (PAR-Q). Can J Sport Sci. 1992;17(4):338-45. [ Links ]
39. American College of Sports Medicine position stand. The recommended quantity and quality of exercise for developing and maintaining cardiorespiratory and muscular fitness in healthy adults. Med Sci Sports Exerc. 1990;22(2):265-74. [ Links ]
40. DeBusk RF, Stenestrand U, Sheehan M, Haskell WL. Training effects of long versus short bouts of exercise in healthy subjects. Am J Cardiol. 1990;65(15):1010-3. [ Links ]
41. Dunn AL, Marcus BH, Kampert JB, Garcia ME, Kohl HW 3rd, Blair SN. Comparison of lifestyle and structured interventions to increase physical activity and cardiorespiratory fitness: a randomized trial. JAMA. 1999;281(4):327-34. [ Links ]
42. Jakicic JM, Wing RR, Butler BA, Robertson RJ. Prescribing exercise in multiple short bouts versus one continuous bout: effects on adherence, cardiorespiratory fitness, and weight loss in overweight women. Int J Obes Relat Metab Disord. 1995;19(12):893-901. [ Links ]
43. Murphy MH, Hardman AE. Training effects of short and long bouts of brisk walking in sedentary women. Med Sci Sports Exerc. 1998;30(1):152-7. [ Links ]
44. Schnohr P, Scharling H, Jensen JS. Changes in leisure-time physical activity and risk of death: an observational study of 7,000 men and women. Am J Epidemiol. 2003;158(7):639-44. [ Links ]
45. Blair SN, LaMonte MJ, Nichaman MZ. The evolution of physical activity recommendations: how much is enough? Am J Clin Nutr. 2004;79(5)913S-920S. [ Links ]
46. Sallis J, Owen N. Physical activity and behavioral medicine. Thousand Oaks: Sage Publications; 1999. [ Links ]
47. Bandura A. Social foundations of thought and action: a social cognitive theory. Englewood Cliffs: Prentice Hall; 1986. [ Links ]
48. Prochaska JO, DiClemente CC. Stages and processes of self-change of smoking: toward an integrative model of change. J Consult Clin Psychol. 1983;51(3):390-5. [ Links ]
49. Sallis JF, Hovell MF, Hofstetter CR, Barrington E. Explanation of vigorous physical activity during two years using social learning variables. Soc Sci Med. 1992;34(1):25-32. [ Links ]
50. Bandura A. Self-efficacy: toward a unifying theory of behavioral change. Psychol Rev. 1977;84(2):191-215. [ Links ]
51. Marcus BH, Simkin LR. The transtheoretical model: applications to exercise behavior. Med Sci Sports Exerc. 1994;26(11):1400-4. [ Links ]
52. Prochaska J, Redding C, Evers K. The transtheoretical model and stages of change. In: Glanz K, Lewis FM, Rimer BK, editors. Health behavior and health education: theory, research and practice. San Francisco: Jossey-Bass Publishers; 1997. p. 60-84. [ Links ]
53. Marcus BH, Selby VC, Niaura RS, Rossi JS. Self-efficacy and the stages of exercise behavior change. Res Q Exerc Sport. 1992;63(1):60-6. [ Links ]
54. Marcus B, Sallis J. Determinants of physical activity behavior and implications for interventions. In: Leon AS, editor. Physical activity and cardiovascular health: A National Consensus. Champaing: Human Kinetics Publishers; 1997. p. 192-201. [ Links ]
55. Chinn DJ, White M, Harland J, Drinkwater C, Raybould S. Barriers to physical activity and socioeconomic position: implications for health promotion. J Epidemiol Community Health. 1999;53(3):191-2. [ Links ]
56. Araújo TL, Andrade DR, Matsudo SMM, et al. Behavior stages and barriers related to physical activity. FIMS World Congress Abstracts Program; 1998. p. 40. [ Links ]
57. Matsudo S, Matsudo V. Physical activity and ageing in developing countries. In: Bailey S, editor. Women, sport and physical activity: Perpectives The multidisciplinary series of physical education and sport science. Physical activity and ageing. International Council of Sport Science and Physical Education; 2000. p. 65-82. [ Links ]
58. Andrade D, Figueira A, Araujo T, Matsudo V, Matsudo S, Andrade E. Barriers to adhesion among activity young adults. Med Sci Sports Exerc. 1998;30(5 Suppl):S182. [ [ Links ]abstract].
59. Sallis J, Owen N. Ecological models. health behavior and health education. In: Glanz K, Lewis FM, Rimer BK, editors. Health behavior and health education: theory, research and practice. 2nd ed. San Francisco: Jossey Bass Publishers; 1997. p. 403-24. [ Links ]
60. Tai SS, Gould M, Smith P, Iliffe S. Promoting physical activity in general practice: should prescribed exercise be free? J R Soc Med. 1999;92(2):65-7. [ Links ]
61. Patrick K, Sallis JF, Long B, et al. A new tool for encouraging physical activity: Project PACE. Phys Sportsmed. 1994;22(11):45-55. [ Links ]
62. Calfas K, Sallis J, Oldenburg B, Frech M. The impact of health-care providers on physical activity. In: Leon A, editor. Physical activity and cardiovascular health: A National Consensus. Champaing: Human Kinetics Publishers; 1997. p. 245-51. [ Links ]
63. Pinto BM, Goldstein MG, DePue JD, Milan FB. Acceptability and feasibility of physician-based activity counseling. The PAL project. Am J Prev Med. 1998;15(2):95-102. [ Links ]
64. Blair SN, Applegate WB, Dunn AL, et al. Activity Counseling Trial (ACT): rationale, design, and methods. Activity Counseling Trial Research Group. Med Sci Sports Exerc. 1998;30(7):1097-106. [ Links ]
65. Writing Group for the Activity Counseling Trial Research Group. Effects of physical activity counseling in primary care: the Activity Counseling Trial: a randomized controlled trial. JAMA. 2001;286(6): 677-87. [ Links ]
66. Albright CL, Cohen S, Gibbons L, et al. Incorporating physical activity advice into primary care: physician-delivered advice within the activity counseling trial. Am J Prev Med. 2000:18(3):225-34. [ Links ]
67. Matsudo SM, Matsudo VR. Coalitions and networks: facilitating global physical activity promotion. IUHPE Promotion & Education. XIII, 2; 2006. Available from URL: http://www.agitasp.org.br/material/arquivos/Matsudo-Promotion-Health-2006-ENG.pdf. Accessed in 2007 (Mar 16). [ Links ]
68. McClellan W. The physician and patient education: a review. Patient Educ Couns. 1986;8(2):151-63. [ Links ]
69. Campbell MJ, Browne D, Waters WE. Can general practitioners influence exercise habits? Controlled trial. Br Med J (Clin Res Ed). 1985;290(6474):1044-6. [ Links ]
70. Logsdon DN, Lazaro CM, Meier RV. The feasibility of behavioral risk reduction in primary medical care. Am J Prev Med. 1989;5(5):249-56. [ Links ]
71. Balde A, Figueras J, Hawking DA, Miller JR. Physician advice to the elderly about physical activity. J Aging Phys Act. 2003;11(1):90-7. [ Links ]
72. Calfas KJ, Long BJ, Sallis JF, Wooten WJ, Pratt M, Patrick K. A controlled trial of physician counseling to promote the adoption of physical activity. Prev Med. 1996;25(3):225-33. [ Links ]
73. Swinburn BA, Walter LG, Arroll B, Tilyard MW, Russell DG. The green prescription study: a randomized controlled trial of a written exercise advice provided by general practitioners. Am J Public Health. 1998;88(2):288-91. [ Links ]
74. Petrella RJ, Lattanzio CN. Does counseling help patients get active? Systematic review of the literature. Can Fam Physician. 2002;48:72-80. [ Links ]
75. Kreuter MW, Chheda SG, Bull FC. How does physician advice influence patient behavior? Evidence for a priming effect. Arch Fam Med. 2000;9(5):426-33. [ Links ]
76. Campbell MK, DeVellis BM, Stretcher VJ, Ammerman AS, DeVellis RF, Sandler RS. Improving dietary behavior: the effectiveness of tailored messages in primary care settings. Am J Public Health. 1994;84(5):783-7. [ Links ]
77. Petty RT, Cacioppo JT, Strathman AJ, Priester JR. To think or not to think: exploring two routes to persuasion. In: Shavitt S, Brock TC, editors. Persuasion: Psychological insights and perspectives. Boston: Allyn and Bacon; 1994. p. 81-116. [ Links ]
78. Skinner CS, Siegfried JC, Kegler MC, Stretcher VJ. The potential of computers in patient education. Patient Educ Couns. 1993;22(1):27-34. [ Links ]
79. Marshall AL, Smith BJ, Bauman AE, Kaur S. Reliability and validity of a brief physical activity assessment for use by family doctors. Br J Sports Med. 2005;39(5):294-7; discussion 294-7. [ Links ]
Address for correspondence:
Celso Ricardo Fernandes de Carvalho
Centro de Promoção da Saúde Serviço de Clínica Geral do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (HC/FMUSP)
Rua Dr. Enéas de Carvalho Aguiar, 455 4º andar Bloco 6 Prédio dos Ambulatórios
São Paulo (SP) Brasil CEP 05408-040
Tel. (+55 11) 3069-7691
Sources of funding: Not declared
Conflict of interest: Not declared
Date of first submission: September 15, 2006
Last received: March 8, 2007
Accepted: March 16, 2007
Marcos Ausenka Ribeiro, MSc. Physical educator; professor at Centro de Estudos do Laboratório de Aptidão Física de São Caetano do Sul (Celafiscs), São Paulo, Brazil.
Milton de Arruda Martins, MD. Full professor in the Department of Internal Medicine and Head of General Clinical Service at Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo (HC/FMUSP), São Paulo, Brazil.
Celso Ricardo Fernandes Carvalho. Physical educator and physiotherapist; professor in the Department of Physiotherapy, Speech and Occupational Therapy of Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil.