Scientific knowledge in the field of Physical Education: paths to complexity

Abstract This manuscript aims to discuss possibilities for the incorporation of complex thinking in the scientific field of Physical Education (PE) in Brazil. In dialogue with philosophers who theorize about complex thinking, we analyze the ordering of scientific knowledge structures in Brazil, such as the organization in areas and lines of PE Graduate Programs (PPGs) exposed on their websites and the Coordination for the Improvement of Higher Education Personnel (CAPES) document. Regarding sociocultural transformations that occurred throughout the 20th century, science perceives the limits of knowledge, where divisions in disciplines seem to be insufficient to investigate the complexity of problems, giving rise to the epistemological perspective of complex thinking. PE is organized in a multidisciplinary and interdisciplinary way, but with gaps between human sciences and natural sciences. Therefore, seeking strategies to reduce borders is emerging for the area to adapt to the new scientific needs of the 21st century.


INTRODUCTION
As sociocultural changes occur, new theories, hypotheses, premises and laws that gave rise to scientific thought are reformulated to follow transformations that present new truths and uncertainties. In the 20 th century, the simple and general principles of science proved to be insufficient, thus emerging a new epistemological paradigm, the complexity of phenomena, where the dialogue between disciplinary perspectives emerges as one of the challenges to be faced 1 . In the context of scientific research, the area of knowledge identified as Physical Education (PE) in Brazil has other nomenclatures in other countries, namely: Physical Education, Kinesiology, Kinanthropology, Sport Sciences, among others [2][3][4][5] .
In these denominations, it is possible to identify elements that show the scientific epistemological heterogeneity. This point was highlighted by Renson 2 , who states that the area is identified as interdisciplinary with two disciplines (interdisciplinary), interdisciplinary with more than two disciplines (cross-disciplinary) or multidisciplinary, with more demarcated borders. In Brazil, however, when analyzing the ordering of Graduate Programs (PPGs), there is predominance of multidisciplinarity.
These conceptions have science organized into separate disciplines as a starting point for different relationships. Scientific disciplines are determined by a mental structure, called paradigm, which serves to classify the world and be able to approach it 6 . According to Fourez 6 , paradigms are the set of rules, principles, mental structures, instruments, cultural norms and/or practices that structure the discipline and are conditioned by the historical-sociocultural context to which they are inserted, which are subject to epistemological ruptures.
For Morin 1 , the disciplinary division of science has advantages and disadvantages; the work specialization generates conveniences such as the coherence of an organizing whole, but also the confinement and fragmentation of knowledge, and does not include the complexity of life. For philosopher Olga Pombo 7 , this division has yielded important fruits for science; however, it is insufficient today because it does not allow the whole to be reconstructed, which is a necessary change identified at the end of the 20 th century.
As an alternative to this scenario, Morin 1 proposes the insertion of the complex thinking in the development of science, since we are beings at the same time physical, biological, social, cultural, psychic and spiritual. In this perspective, the same author 1 points out that pertinent knowledge is able to place all information in its context and, if possible, in the set in which it is inserted, understanding its ambivalences, since the antagonistic and complementary relationship is what defines complexity. The argument for a complex approach to complex problems has been heard since the beginning of the 20 th century, although it has assumed greater sense of urgency as the magnitude and complexity of problems increases and demands an increase in praxis 3 .
The complex thinking methodology would have in PE a fertile field of application, as it is characterized by having several disciplinary approaches, since it understands that the various disciplines that compose it would help each other to understand the study objects, as the intelligence that only knows how to separate breaks the complexity of the world into isolated fragments 8 . By accepting to face the challenges imposed by this form of complex thinking, Brazilian PE would progress by adapting to a new scientific spirit, a movement already initiated by agencies that regulate Graduate Studies (PPGs) in the country 9 . Although this document does not make it clear how this will happen.
In this context, this manuscript aims to discuss possibilities for incorporating complex thinking in the scientific field of PE in Brazil.

BRAZILIAN PHYSICAL EDUCATION AND DISCIPLINARY ORDERING
In Brazil, the scientific field of PE has been organized with different nomenclatures related to theoretical perspectives, as can be seen in PPGs in the area: PE, Human Movement Sciences, PE and Sport, Physical Activity Sciences, Exercise and Sport Sciences, Motor Sciences and Sport Sciences. Currently, there are four PPGs in the field of PE elected as excellence by the Coordination for the Improvement of Higher Education Personnel (CAPES), namely: PPG in Physical Education and Sport at the University of São Paulo (PPGEEFE/USP) 10 ; PPG in Physical Education at the Federal University of Paraná (PPGEDF/UFPR) 11 ; PPG in Physical Education at the Federal University of Santa Catarina (PPGEF/UFSC) 12 and PPG in Human Movement Sciences at the Federal University of Rio Grande do Sul (PPGCMH/UFRGS) 13 , which have disciplinary divisions with internal logic, as shown in Box 1, composed and decomposed in research areas and lines.
Even though the structures of these PPGs have been developed according to contextual spheres, such as the historically developed relationships of power disputes that structure scientific conceptions, the scientific organization of an area offers evidence of how scientific thinking is ordered. Box 1 shows how scientific organization of PE occurs and the divisions between Human Sciences and Natural Sciences, with small variations in the latter, which is divided into Biodynamics and Physical Activity and Health in PPGEDF/UFPR 11 and PPGEF/UFSC 12 graduate programs.
The authors 3,5 highlight that this gap in scientific approaches has been deepened over time, continues to the present day and has been identified in PE internationally, intensifying a multidisciplinary character and limiting the possibilities of interdisciplinarity in the area 2 . Thus, interdisciplinary actions are limited in internal communications between disciplines that make up Natural Sciences, as well as within Human Sciences, as can be seen in texts that identify the PPGEDF/UFPR research lines (Box 1).
In this context, it is clear that the organizations of scientific disciplines in PE are mostly multidisciplinary and interdisciplinary 2 . Multidisciplinarity aggregates disciplines in a parallelism of points of view; if these are outdated, in the sense of convergence and coordination between them, the interdisciplinary perspective is constituted 7 .
According to Renson 2 , multidisciplinarity consists of a set of separate disciplines that study a central theme, without integrating concepts. Such a format can be seen in the designations of areas and lines of knowledge of PE PPGs, which build the objects of study with terms such as physical exercise, physical activity, body and sport. Since the object of study is not born before the existence of the discipline that addresses it 6 , the conceptions expressed in the terms used demonstrate to which scientific approach they are linked and in line with theories adopted. Involves studies and research focusing on manifestations related to sport and leisure, with analyses from sociological, political, historical, philosophical, educational and cultural perspectives.

Physical Activity and Health
Involves studies and research on physical activity and exercise as a means of promoting health in different populations and environments, with emphasis on physiological, biomechanical, psychological, nutritional, epidemiological and functional aspects.

Physical and Sports Performance
Involves studies and research aimed at improving physical and sports in different populations, developed from the perspectives of physiology, biomechanics, psychology and nutrition. In Brazil, the very location of PE in the Great Area of Health Sciences at CAPES contributes to the great gap 5 , since it is structured in the characteristics that the area imposes, linked to Life Sciences and, thus, with predominance of Natural Sciences. This location hinders -but does not prevent -the construction of knowledge in an interdisciplinary way and, thus, reduces the possibility of analyzing the object from different disciplinary angles, which creates other problems.
According to Article 207 of the Brazilian Federal Constitution 14 , Universities obey the principle of inseparability of teaching, research and extension, which triad must interact with each other, that is, the researcher transfers knowledge to teaching and extension activities and vice versa. However, when the researcher background is organized by areas of knowledge without integration, this knowledge is manifested in professional training at undergraduate level, generating the culture of the mass man, the assembled man assembling parts, which lacks own intimacy 15 . According to Morin 8 , the subject produces the mysterious quality called self-knowledge from complex thinking.

TOWARDS COMPLEXITY OF BRAZILIAN PHYSICAL EDUCATION
The scientific field of PE is composed of a diverse set of scientific disciplines, as identified in Box 1, ordered in research areas and lines that may vary in the different PPGs, that is, with more or less delimited boundaries based on theoretical and methodological affinities, multidisciplinary way, but with the possibility of developing border sciences. Border sciences are the new disciplines located on the border between two traditional disciplines 7 , fluid spaces between demarcation and communication, where the maze, the inextricable, the disorder, the ambiguity can occur, in short, the complexity, which arises where simplifying thinking fails 1 .
Unlike the current ordering of PPGs, for Morin 1 , knowledge cannot be limited within strict boundaries, nor can it expand and disperse, it must have space for knowledge interlocution. In the same direction, Olga Pombo 7 states that scientific progress results from the presence of various languages and disciplines in the researcher's conscience. Thus, indivisible dimensions must be manifested in the investigative process, where knowledge is, therefore, a multidimensional inseparable phenomenon, simultaneously physical, biological, cerebral, mental, psychological, cultural, social 8 .
According to Patrícia Vertinsky 3 , in the 2000s, there were already changes in scientific approaches in PE research at international level, mainly in Kinesiology departments, especially when investigations tried to raise research funds from public and private agencies or educate students for newly created professions. In these departments, where health and body issues are generally recognized as central for physical activity studies, it has become clear to many that the complexity of these problems requires interdisciplinary approach focused on team problems 3 .
In Brazil, this movement started to occur in fact recently, from the CAPES 9 document, aiming at changes in PPGs evaluation for the next quadrennium. Such recommendations are based on the exchange of knowledge and propose PPGs as environments where the advancement and breaking of knowledge frontiers are encouraged, without imposition of disciplinary barriers, with attention to society, promoting dialogue between peers at national and international level 9 .
However, for this to happen, it needs to break with historically established disputes that deepened the rupture of the area into Human Sciences and Natural Sciences 4 . By overcoming this challenge, PE would become truly interdisciplinary by assuming that the pertinent knowledge is capable of placing all information in its context and, if possible, in the set in which it is inserted 8 , towards a complex thought about the objects it addresses.
It seems that this way of thinking about science will be used by CAPES in the coming years for the evaluation of programs that assume that the final product to be evaluated is the solution of a problem (or bottleneck) demanded by society that it is usually complex, and, as a rule, requires interdisciplinarity for its solution 9 . Box 2 presents possible strategies for bringing human and natural sciences closer together in PE PPGs based on the types of interdisciplinary crossing. Box 2. New interdisciplinary crossing practices 7 .

Practices
Type of interdisciplinary Importation A central discipline co-opts the work regarding methodologies, languages and equipment already used in another discipline.

Crossing
Opening each discipline to all the others, disciplines allow themselves to be contaminated and crossed with elements characteristic of each one.

Convergence
Studies by areas involving convergence of perspectives.

Decentralization
When traditional disciplines are not sufficient for the knowledge of specific problems or are too large. There is no discipline that constitutes the point of departure or irradiation of the problem, nor even the point of arrival of work.

Commitment
For issues too vast that have resisted over the centuries. Where our knowledge is few to even notice, an engaging and circular interdisciplinarity is needed, which actively explores all possible complementarities between disciplines.
A plan to incorporate interdisciplinarity into PE PPGs can be organized from the simplest to the most complex. At first, it could institute two types of interdisciplinary practices, that of importation and that of convergence, and other practices could be later introduced.

CONCLUSION
This manuscript sought to discuss possibilities for incorporating complex thinking into the scientific field of PE in Brazil. The elements presented allowed reflecting on the main current characteristics of PPGs of excellence in the area, which are organized in a multidisciplinary way. As complex thinking determines fluidity between boundaries of scientific disciplines, the modification of some structures in areas and lines of these PPGs, promoting interdisciplinarity, will allow research to address the complex problems that contemporaneity provides.
The challenge of adopting complexity as a motivation for thinking has emerged over the decades of the 20 th century and will erupt in the 21 st century. New proposals for incorporating this thinking are emerging but for this to occur, it is necessary to face incompleteness and uncertainty that its paths lead to: the irreducibility of chance and disorder; the transgression of the limits of universalist abstraction that eliminates singularity, locality and temporality; the complication; a complementary relationship between order, disorder and organization; and the organization that constitutes a unit and a multiplicity, where not only the part is in the whole, but the whole is in the part 1 . However, perhaps the greatest challenge of Brazilian PE is to break with walls raised among scholars of Human Sciences and Natural Sciences for the definition and mastery of the field.

Funding
This research did not receive any specific grant from funding agencies in the public, commercial, or no-profit sectors. This study was funded by the authors.

Ethical approval
The protocol research was written in accordance with standards set by the Declaration of Helsinki.