Open-access Educational interventions for physical activity among Brazilian adults: systematic review

ABSTRACT

OBJECTIVE  To summarize the main evidence from educational interventions designed to increase levels of physical activity (PA) among Brazilian adults.

METHODS  Systematic review of intervention studies carried out in Brazil that implemented educational components aimed at promoting increased levels of PA among adult populations (18 to 65 years old). In October 2020, systematic searches were conducted in six databases, and in the reference lists of the assessed studies.

RESULTS  Of the initial 2,511 studies, nine were included in the synthesis. Samples with specific characteristics (such as social vulnerability, physical inactivity, and overweight or obesity) were observed, with a greater number of women. Five interventions (55.6%) occurred in primary healthcare settings (PHC) of the Brazilian Unified Health System (SUS). Only four studies (44.4%) described the pedagogical frameworks structuring the educational approaches, among which counseling was the most used strategy, such as those carried out through face-to-face meetings, home visits, lectures, and phone calls (n = 8; 88.9%). Positive results were observed in three different indicators: increase in weekly PA volume (n = 4); increase in leisure-time PA rate (n = 1); and increase in the proportion of women classified as “very active/active” (n = 1). Given the sampling specificities, the domain “participant selection” showed a high number of interventions with high risk of bias.

CONCLUSIONS  Educational approaches engendered some positive effects on different PA indicators, notably counseling as the main strategy used and approaches involving other health themes, such as nutrition and stress. However, considering the several determinants of PA in Brazil, future interventions should be conducted in different locations of Brazil in order to evaluate, in a broader way, their implementation processes and articulation with the many professionals working in PHC.

Adult; Exercise; Health Education; Health Promotion; Systematic Review

RESUMO

OBJETIVO  Sumarizar as principais evidências de intervenções educativas delineadas para o aumento dos níveis de atividade física (AF) em adultos brasileiros.

MÉTODOS  Revisão sistemática de estudos de intervenção conduzidos no Brasil, que implementaram componentes educativos com a finalidade de promover o aumento dos níveis de AF em populações de adultos (18 a 65 anos). Em outubro de 2020, buscas sistemáticas foram conduzidas em seis bases de dados e nas listas de referências dos artigos avaliados.

RESULTADOS  Dos 2.511 artigos iniciais, nove compuseram a síntese. Foram observadas amostras com características específicas (como vulnerabilidade social, inatividade física e sobrepeso ou obesidade), com maior número de mulheres. Cinco intervenções (55,6%) ocorreram nos cenários da atenção primária à saúde (APS) do Sistema Único de Saúde (SUS). Apenas em quatro estudos (44,4%) houve descrição dos referenciais pedagógicos estruturantes das abordagens educativas, dentro os quais o aconselhamento se configurou como a estratégia mais utilizada, como aquelas realizadas por meio de encontros presenciais, visitas domiciliares, palestras e chamadas telefônicas (n = 8; 88,9%). Resultados positivos foram observados em três distintos indicadores: aumento do volume semanal de AF (n = 4); aumento do índice de AF no lazer (n = 1); e aumento da proporção de mulheres classificadas como “muito ativas/ativas” (n = 1). Visto as especificidades amostrais, o domínio “seleção dos participantes” apresentou elevado número de intervenções com alto risco de viés.

CONCLUSÕES  As abordagens educativas produziram alguns efeitos positivos em distintos indicadores de AF, destacando-se o aconselhamento como principal estratégia utilizada e as abordagens que envolveram outras temáticas de saúde, como nutrição e estresse. Contudo, frente aos diversos determinantes da AF no Brasil, é importante que futuras intervenções sejam conduzidas em variadas localizações do país, de forma que avaliem, de maneira mais ampla, seus processos de implementação e articulação com os distintos profissionais que atuam na APS.

Adulto; Exercício Físico; Educação em Saúde; Promoção da Saúde; Revisão Sistemática

INTRODUCTION

Due to the multidimensional impacts it has on an individual’s life, physical activity (PA) has been identified as an important factor for human development1. More specifically, PA is recognized to be a determinant of several positive health indicators2, so that actions and policies for its promotion at the population level and throughout the life cycle have been advocated by several health agencies around the world3,4.

In the last decades, PA promotion has deserved much attention in the Brazilian public health agenda, especially for its introduction in the Brazilian Health System (in Portuguese: Sistema Único de Saúde - SUS) and in several national public policies5. However, despite this favorable institutional scenario, “promoting PA” is not a simple task in Brazil, since factors such as gender, income, education, and environment6 are determinants of its practice.

Primary healthcare (PHC) settings are, thus, potential settings for the implementation of strategies9,10 to reduce inequities in access to PA. In the SUS context is can potentially increase the completeness and resoluteness of healthcare, enhancing the ability to promote PA in contexts of different levels of social vulnerability11,12.

Literature also suggests that interventions based on educational processes13 entail favorable results to increase PA levels at different moments of life. This evidence, however, is mainly supported by data from interventions developed in high-income countries. Even with the existence of a systematic review of interventions in Latin American countries14, the relevance of a more specific synthesis of the Brazilian studies is justified, as it would enable a debate grounded in the Brazilian reality, besides pointing out possible advances toward future national surveys.

This study aims at summarizing the main evidence of educational interventions designed to increase the PA levels of Brazilian adults.

METHODS

This study is characterized as a systematic literature review, with methodology and operational process based on “The Cochrane Handbook for Systematic Reviews of Interventions”15, and on the items of the “Preferred Reporting Items for Systematic Reviews and Meta-Analyses” (PRISMA)16 list, respectively. This review is part of a larger project named “Translation of evidence for decision making in the Brazilian public health system: a review of interventions aiming physical activity promotion”, registered in the PROSPERO database (CRD42015015993).

The inclusion criteria were designed based on the “PICOS” logic, considering that the synthesis would be made up of original scientific studies with the following characteristics: (I) Participants: adult populations, without disabilities, health conditions, or specific diseases, except for samples exclusively composed of participants with overweight or obesity; (II) Interventions: developed in Brazil, implemented in community settings (such as territories, PHC centers, outpatient clinics, and community organizations) and based on educational actions aimed to increase PA levels, regardless of the form of contact (face-to-face or remote meetings) and approach (individual or group); (III) Comparators: no restrictions were imposed regarding the activities performed by the control groups (if there were more than one control group, it was decided that the group that had received the least theoretical and/or practical content would be chosen); (IV) Outcome: PA levels, regardless of the PA indicators used (such as levels of moderate or vigorous PA, and number of steps a day), contexts observed (such as total PA, leisure time displacement time), and the instruments used to measure these (such as questionnaires and motion sensors); and (V) Study design: all types of intervention studies (“trials”), with no restrictions regarding the presences of randomization between groups and/or control group.

To retrieve the potential studies, we conducted: systematic searches in six electronic databases (Lilacs, Pubmed, Physical Education Index, Scielo, Scopus, and Web of Science) covering the available literature from the beginning until October 5, 2020, based on the strategy developed for Pubmed: (“physical activity”[Text Word] OR “exercise”[Text Word] OR “sport”[Text Word] OR “walk”[Text Word] OR “walking”[Text Word] OR “run”[Text Word] OR “running”[Text Word] OR “bike”[Text Word] OR “cyclying”[Text Word]) AND “Brazil”[Text Word] AND (“experimental study”[Text Word] OR “randomised controlled trial”[Text Word] OR “randomized controlled trial”[Text Word] OR “quasi-experimental”[Text Word] OR “clinical trial”[Text Word]). In addition to this strategy, manual searches were performed in the reference lists of the studies assessed by its full-texts.

The titles, abstracts and full texts assessments were performed independently by six researchers (AM, HF, GC, IC, JF and WW), supported by a senior researcher to clarify doubts, and establish consensus (PG). Data extraction was also conducted by the same six researchers, also independently, and supported by two senior researchers (ER and PG), on a spreadsheet initially divided into three domains: (I) descriptive features (such as intervention name/acronym, location, population description, and age/age group); (II) methods (such as recruitment and implementation location, group size at baseline and sample losses, description and strategies used in the intervention and control groups, intervention implementation team, and instruments and procedures used for measuring PA); and (III) PA-related outcomes (such as variables analyzed, procedures used for PA data analysis, and statistical magnitude and significance of findings based on “p-value”). Regarding the outcomes of interventions, effect sizes were considered for synthesis, as well as the results of the statistical comparison tests.

The risk of bias of the included studies was assessed by two researchers (ER and PG) using an adapted version of the EPHPP17 instrument, which assesses seven methodological domains of an intervention study: “selection bias”, “adjustment of confounding variables”, “methods used in data collection”, “losses and dropouts”, “intervention integrity”, “protocol used in the analysis”, and “use of intention to treat”.

RESULTS

The electronic database searches resulted in 2,511 potentially relevant studies, of which 165 were initially identified as duplicates and thus excluded from the process (Figure 1). At the end of the evaluation by titles and abstracts, 110 studies were selected for reading of their full texts. Considering the exclusion of 102 of these, mainly due to “age group” (n = 36) and “study design” (n = 29), and the inclusion of one study retrieved by manual search on reference lists, the descriptive synthesis of the current review was composed from data of nine intervention studies conducted in Brazil18.

Figura 1
Fluxograma da revisão sistemática.

In Table 1, it can be observed that interventions were conducted in six Brazilian cities from five states, covering the Southeast (n = 6)19,20,22,23,25,26, South (n = 2)18,24 and Northeast (n = 1)21 regions, most of them conducted in cities of São Paulo state (n = 5–55.6%)19,20,22,23,26. Most of the interventions involved populations with mean age of 40 years (n = 6–66.7%)18, and women as the majority in all samples with available data (n = 8–88.9%)18,19,21.

Table 1
Descriptive features of the interventions included (n = 9).

As for duration, interventions ranged from two20 to 12 months21,26, and five of them (55.6%) were developed over at least six months18,19,21,22,26 (Table 2). In two interventions, participants were followed up and evaluated for six months after the end of the intervention19,26. In regard of settings, we may highlight five interventions taking place in PHC settings of the SUS, either in health units19,22,24,26, or in centers of the Health Academy Program25, with great variability among people who delivered the interventions, as examples, professionals working in PHC-SUS settings, research teams, and specialists. Seven interventions had as their primary objective the increase in PA levels (77.8%)19,20,22.

Table 2
Synthesis of the elements part of the interventions (n = 9).

In four studies22,24 (44.4%), it was observed the description of pedagogical frameworks structuring the educational approaches, so that different approaches were combined in two studies22,26: the Social Cognitive Theory25 and Paulo Freire’s educational method24 (Table 2). Regarding the strategies adopted in the educational processes, counseling was used in eight interventions (88.9%), either through face-to-face meetings18,19,21,23,26, home visits22,24, lectures24, or phone calls20. Three interventions delivered educational materials23, while three interventions implemented hands-on activities19,21,26. In addition, five interventions addressing other health topics in their educational actions, such as nutrition18,21,23,25,26 and stress26 were also identified.

With the exception of the study by Meurer et al. (2019)25, all the interventions included used questionnaires to assess PA, with higher frequency of use of the IPAQ versions (n = 6)18,19,21. In addition to the questionnaire, two studies also used accelerometers to measure PA19,26. Samples ranged from 1420 to 29125 participants (Table 3).

Table 3
Synthesis of measurement instruments used and results related to increased levels of physical activity, by study design (n = 9).

Regarding the effects, six interventions resulted in statistically significant data regarding PA in the following indicators: (I) increase in weekly PA volume18,23,25,26 - with highlights to the findings of Assunção et al. (2010)18, which showed an increase of 88 minutes a week in the intervention group compared to the control group (p = 0.01), of Meurer et al. (2019)25, which showed a significant increase of moderate and vigorous PA in the intervention group compared to the control group (Effect size = 0.18), and of Ribeiro et al. (2017)26, in which, six months after the end of the study, the group that received the educational component showed an increase in the annual exercise score (0.2; 95%CI 0.1-0.4); (II) increase in the index of habitual PA at leisure24; and, (III) increase in the proportion of women classified as “very active/active”, from 30.4% at baseline to 73.9% at the end of the intervention (Table 3), in Costa et al. (2009)21.

According to Figure 2, methodological potentialities were observed in the domains “methods used in data collection” and “analysis protocol”, where all studies were classified as having “low” risk of bias. On the other hand, “participant selection” was the domain where a higher frequency of studies assessed as high risk were found, especially due to specificities in four samples (such as overweight/obese people18, people living in regions of high vulnerability19,26 and physically active21,23,25 or inactive19,20,26 people), which limit the generalizability of the original evidence. The domain “intervention integrity” showed seven studies rated as moderate risk of bias20, because they did not report the assessment of consistency of the intervention, and did not mention the risk of contamination between the groups – i.e., the influence caused by the possible proximity of people between the groups, so that those assigned to the control group may also be exposed to the actions conducted to the intervention group.

Figura 2
Análise do risco de viés das intervenções incluídas (n = 9).

DISCUSSION

Based on data from nine interventions conducted in six Brazilian cities, from three regions of the country, the current synthesis pointed out positive results in three different PA indicators: (I) increase in weekly PA volume18,23,25,26; (II) increase in leisure time PA index24; and (III) increase in the proportion of women ranked as “very active/active”21. Despite the great heterogeneity among pedagogical frameworks that supported the educational processes, counseling practice was the strategy most often adopted by the interventions, regardless of their format and the content approached, also highlighting approaches in other health-related topics, such as nutrition and stress.

Given the growth of academic production related to PA and health topic in Brazil27, the number of interventions can be considered to be low. However, this scarcity may be justified by the current context of cuts of budget for research in Brazil28,29, besides the fact that intervention studies demands longer time to be developed, as well as more funding and larger teams. Even so, regarding the results, what was observed in this synthesis supports the evidence of Heath et al. (2012)13 and Hoehner et al. (2013)14 regarding the effects of educational processes on interventions aimed at increasing the PA levels. The positive results observed in interventions conducted in PHC-SUS settings are also worth noticing24,26. International studies recommend interventions in PHC settings, considering the greater possibility of dissemination of a given strategy9,10,30.

Most studies did not report the pedagogical frameworks that supported the educational approaches. Considering that some of the strategies were conducted in the context of the PHC-SUS, which is grounded in premises of health promotion, this is an important gap, including for understanding their alignment with the main national policies, the paths of strategies, and the role of players involved throughout the implementation process. The four studies22,24 with available information based their interventions on different frameworks, either grouped or isolated, thus limiting more in-depth comparisons.

In view of the limitations perceived in the information-based approaches, it is suggested that future interventions also incorporate knowledge from Behavioral Economics31, particularly regarding its notion that knowledge, although important, is insufficient in most cases since it disregards the action of non-conscious processes that determine our choices32.

Furthermore, it is worth mentioning the importance of ecological or socio-ecological approaches and models, which include several factors from different “levels” that influence human behavior, in a perspective that goes beyond the understanding of health as a mere state of absence of disease33. Although educational strategies may play an important role in promoting PA levels, one should not lose sight of the fact that these should be implemented in parallel with the approach of many other factors31.

Regarding counseling, which was the most used educational strategy among the studies included, there are records on its positive influence on behavioral change stages34, as well as its effect on increasing PA levels35. A nationwide study indicates that PA counseling is a practice used by most physicians and nurses working in PHC36, even though many of them have little technical knowledge on PA-related issues.

As with the issue of pedagogical references, most of the studies included in the synthesis did not report important elements of the counseling processes, such as: concepts and topics approached, sequential logic subjects, as well as actions aimed at the broader concept of “PA promotion”, involving elements of identification and overcoming of barriers to the practice, for example. This finding reinforces the results found by Gagliardi et al. (2015)37 and, since the continuous offer of counseling is associated with maintaining high levels of PA in the long term, it is important to design strategies (such as training courses and guidelines) for the different professionals working in PHC38, in order to provide suitable theoretical and practical subsidies for strengthening it as a public health strategy39.

On the other hand, it should be emphasized that the practice of counseling - and any other strategy conducted alone - may be not enough to improve PA indicators: these themes need to be more present in people’s lives, either through information or other forms of interventions33. In other words, beyond the implementation of specific and/or isolated strategies, it is important that the “PA theme” be more present in people’s lives, since PA promotion is a cross-sector theme by nature.

In this spectrum, we highlight the importance of consistent planning of the built environment of cities, in order to expand people’s access to PA practice rooms. We could mention the opening of bike lanes which, besides physical demarcation of public roads, require traffic laws to ensure cyclists’ safety, as well as improvements in safety and lighting on public roads, favoring active transportation at different times of the day.

On the other hand, considering that most of the interventions included were developed in PHC-SUS settings, counseling for PA may be interconnected with the demands of other healthcare professionals, in the sense of more comprehensive guidance focused on healthy lifestyle habits, and the corresponding improvement of health conditions of a given person or group of people39. This suggestion is emphasized by this synthesis, since interventions were implemented by different specialists, not only by Physical Education professionals.

It is also worth mentioning the interventions that addressed other health themes, such as nutrition18,21,23,25,26 and stress26. Recognizing the emergence of the use of electronic appliances as an auxiliary tool to healthcare40, it can be suggested that future national studies test the introduction of applications with educational content and/or digital counseling under the prism of PHC. It is worth mentioning the promising results of interventions that use digital counseling for reducing systolic blood pressure41.

Even if it was not the objective of the study, but a gap perceived during the process of reading and extracting original data, it is recommended that future interventions report more deeply important internal and external elements such as adoption, scope, effectiveness, implementation and maintenance, as recommended by the RE-AIM instrument42. It is recognized that processes of consistent implementation, which articulate different health professionals with different levels of experience, allow greater generalization, and greater possibility of using this information in decision-making42. A previous systematic review suggests the weakness of reports on the Brazilian school-based interventions in the domains of adoption, implementation, and maintenance43.

Recognizing that the effectiveness of an intervention is directly related to how it is implemented, future studies are recommended to evaluate, in a broader perspective, the process of delivering these strategies, not disregarding the specificities of the SUS PHC settings. Thus, some starting points may be listed, such as: (I) prior recognition of the territories and their respective health needs, by approaching residents and community health agents; (II) permanent dialogue with the many PHC actors, in order to acknowledge the different possibilities of action, and encourage the articulated engagement of the multiprofessional team, from the initial proposal negotiations to the evaluation process; and, (III) expanded health approaches beyond the “AF theme”, developed in groups and complying with the logic of PHC.

This review has some limitations, such as (I) the little conceptual report of the elements that make up the intervention, (II) the congruence of strategies developed in SUS spaces with national policies on PHC, as well as the use of different (III) intervention designs, (IV) populations and contexts, and (V) PA indicators. Given these heterogeneities, we chose not to conduct the meta-analysis. On the other hand, as a major strength, it may be highlighted the more specific focus on educational strategies, which allowed the identification of important gaps, such as absence of reports on the pedagogical guidelines of the interventions, and on the consonance of protocols with the ideals of health promotion in Brazil.

Finally, the available set of Brazilian interventions suggests that the educational approaches produced some positive effects on different PA indicators, highlighting counseling as the main strategy used, and the approaches that involved other health themes, such as nutrition and stress. However, considering the several determinants of PA in Brazil, it is important that future interventions be conducted in different locations of the country, so as to comprehensively evaluate their processes of implementation and articulation with the different professionals working in PHC.

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  • Funding: Conselho Nacional de Desenvolvimento Científico e Tecnológico (Process 449975/2014-2).

Publication Dates

  • Publication in this collection
    17 Dec 2021
  • Date of issue
    2021

History

  • Received
    11 Oct 2020
  • Accepted
    17 Mar 2021
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