DOES PRE-COMPETITIVE ANXIETY INTERFERE IN THE PERFORMANCE OF BOXING ATHLETES IN BRAZIL? A PILOT STUDY

Introduction: Pre-competitive anxiety is one of the psychological factors that can greatly influence athle-tes’ performance, especially when it comes to individual sport like boxing. Objective: To analyze the level of pre-competitive anxiety in male athletes in the adult and young adult categories, and their correlation with the final results of the last Brazilian National Championship. Methods: A total of 60 young adult athletes participated in the study: 38 non-medalists (17.17±0.54 years and 66.38±13.21 kg) and 22 medalists (17.48±0.54 years and 66.21±12.96 kg). The “adults” group consisted of 35 athletes: 11 non-medalists (22.60±4.65 years and 68.33±14.08 kg) and 24 medalists (22.60±4.82 years and 67.33 ±13.13 kg). Results: The levels of cognitive anxiety in the young adult athletes group presented significant differences: medalists presented lower scores than non-medalists (12.77±2.62 and 15.92±5.20, respectively). In the adults group, medalists presented higher scores than non-medalists (15.23±4.42 and 12.00±4.11). Significant differences were observed in somatic anxiety levels between the young adult medalists and the other groups (p = 0.038). In addition, levels of self-confidence were high in all groups (young adult non-medalists = 29.42±4.82; adult non-medalists = 26.14±4.94, young adult medalists = 31.59±4.24 and adult medalists = 28.91±4.88). Conclusion: We conclude that self-confidence may interfere with anxiety levels, considering that medal-winning boxers are less prone to cognitive anxiety than non-medalists, and that both groups have high levels of self-confidence. Level of evidence I; High quality randomized trial with statistically significant difference or no statistically significant difference but narrow confidence intervals. adultos = 26,14 4,94, medalhistas juvenis = 31,59 ± 4,24 e medalhistas adultos = 28,91 4,88). Concluiu-se autoconfiança nos de que boxeadores medalhistas são menos propensos a ansiedade não-medalhistas e que ambos os grupos apresentam


INTRODUCTION
Anxiety, particularly competitive anxiety, has been the subject of many studies in sports psychology 1,2 and has been considered as a decisive factor that tends to interfere with athletic performance. 3,4 Most athletes suffer from pressure, fear, and anxiety caused by the obligation to win, which may be explained by the exaltation of the emotion of victory and the discouragement of defeat; 5 even individual sport athletes, such as in the case of bodybuilding, tend to present higher levels of anxiety than athletes in collective sports. 6 However, boxing requires dedication, with prolonged diets and sometimes with the use of illicit ergogenics without medical supervision, which may even have undesirable effects. 6 Although studies focused on boxing are scarce, the concern with sports performance points in the direction that performance can be affected by intervening factors, among them psychosocial aspects. [7][8][9] Studies have shown that anxiety interferes with the results: the psychic condition is related to the sporting performance. 10,11 Anxiety is characterized by two aspects: cognitive anxiety (CA) is characterized by excessive preoccupation with performance, apprehension and negativism; and somatic anxiety (SA) has as its main characteristic transient changes in physiological activation, such as an increase in heart rate, respiratory changes, excessive sweating, tremors, increased blood pressure, muscle tension, among others, that are subdivided into anxiety-state (AS) and anxiety-trait (AT). In AS, somatic and cognitive changes are manifested by the anxiogenic environment, triggering in specific situations; AT can manifest itself in different situations, such as "part of the personality, as a tendency of behavior", a predisposition of the individual to behave disproportionately in different situations. 12,13 Therefore, anxiety is an important tool in high-performance sports results. However, there is still no consensus in the literature about the effects of pre-competitive anxiety on performance in boxing athletes. In this sense, the objective of this study was to analyze the level of pre--competitive anxiety in male boxing athletes of the adult and juvenile categories, and their correlation with the final results of the Brazilian National Championship of 2017.

METHODS
A total of 60 juvenile athletes participated in the study: 38 were non--medalists-NM (17.17±0.54 years and 66.38±13.21 kg) and 22 were medalists (juvenile group medalists-Med, 17 athletes who provided informed consent were included in the study. The adopted procedures followed the norms of ethics in researches with humans according to Resolution no. 466, of 12/12/2012 of the National Council of Health, normative of research involving human beings, in agreement with the ethical principles contained in the Declaration of Helsinki (1964, reformulated in 1975, 1983, 1989, 1996, 2000, 2008, and 2013) of the World Medical Association.
The study was approved by the Federal University of Sergipe Research Ethics Committee (protocol 01723312.2.0000.0058) in accordance with the guidelines on experiments involving humans.
We used the Competitive State Anxiety Inventory Questionnaire-II (CSAI-2), which was translated and validated by Vasconcelos-Raposo and Fernandes. The questionnaire consisted of 27 questions divided into three sub-scales, i.e., cognitive anxiety, somatic anxiety, and self-confidence. Each subject could choose between four levels that corresponded with their momentary condition: 1 = nothing, 2 = something, 3 = moderate, and 4 = greatly. The sub-scale score was obtained based on the sum of the ratings, with the scores varying from 9 to 36. The cognitive anxiety score was determined based on the sum of the ratings of questions 1, 7, 10, 13, 16, 19, 22, and 25. The somatic anxiety score was determined based on the sum of the ratings of questions 2, 5, 8, 11, 14, 17, 20, 23, and 26. The self-confidence score was determined based on the sum of the ratings of questions 3,4,6,9,12,15,18,21,24, and 27. For interpretation purposes, the cognitive anxiety, somatic anxiety, and self-confidence score levels were categorized as low (9 to 18 points), average (19 to 27 points), or high (28 to 36 points).
Data were collected (in the pre-competition stage) during the general weighing that is performed the day before the official start of the championship, for the adult and juvenile categories. The questionnaire was filled out by an evaluator with at least 20 applications and with an intra-rater correlation higher than 0.954. To ensure that the procedures were effective, the data were collected by a responsible research team and a psychologist who administered the questionnaires. The data collection was completed in the same place where the competition occurred.

Statistical analysis
The central tendency measures, mean±standard deviation (X±SD), were used. To verify the normality of the variables, the Shapiro Wilk test was used, considering the sample size. To verify the possible differences between the groups divided by classification (medalist and non-medalists), one way ANOVA and post hoc test of Bonferroni were used. To verify the size of the effect, the Cohen f 2 test was used, in addition to the cut points 0.02 to 0.15 with a small effect, from 0.15 to 0.35 as median and greater than 0. The statistical treatment was performed using the Statistical Package for Social Science (SPSS), version 22.0. A p < 0.05 was considered. Table 1 shows the results of CSAI-2 on the cognitive, somatic, and self-confidence domains.

RESULTS
The levels of cognitive anxiety in the juvenile group presented significant differences, with medalists presenting lower scores than non-medalists (12.77 and 15.92 respectively). In the adult group, medalists presented higher scores than non-medalists (15.23 and 12.00). Significant differences were observed in somatic anxiety levels between juvenile medalists and the other groups (p = 0.038). In addition, levels of self-confidence were high in all groups (juvenile NM = 29.42, adult NM = 26.14, juvenile Med = 31.59 and adult Med = 28.91).
Significant differences were not observed between the groups, although juvenile medalists presented higher values than the other athletes in the item Self-confidence. Figure 1 and 2 shows the results of CSAI-2 on confidence interval cognitive and Somatic Anxiety domains among Non-Medalist and Medalist on adult and junior categories.
The confidence interval showed a higher probability of the result (being a medalist) depending on the lower cognitive and somatic anxiety in the Junior category compared to the Senior category. Figure 3 shows the results of CSAI-2 on confiance Interval Self Confidence domains between Non-Medalist and Medalist on adult and junior categories.
The confidence interval showed no differences between Adult and Junior regarding performance and self-confidence.
The main results showed that cognitive anxiety levels of juvenile NM were higher than in the other groups. This result can be justified by the fact that cognitive anxiety causes uncertainty with oneself and negative expectations about the possible results. 13 According to Jordet, 14 the best predictor for cognitive anxiety would be the athlete's experience, and the more experience the competitors have the lower the rates of cognitive anxiety, which is in agreement with the findings of our study, considering that adult medalists presented higher indices of this state than juvenile medalists.
The results obtained reinforce the thesis that high-performance adult athletes better manage anxiety than juveniles because they present a higher level of maturity and more experience in competitive sports. 15,16 As an example, adult boxer medalists presented higher scores of cognitive anxiety than the non-medalists. On the other hand, juvenile non-medalist athletes presented higher levels of cognitive anxiety than the medalists.
The levels of somatic anxiety showed significant differences between the juvenile medalists and the other groups (p = 0.038). Levels of self-confidence were high (Juvenile NM = 29.42, Adult NM = 26.14, Juvenile Med = 31.59 and Adult Med = 28.91); there were no significant differences between groups despite juvenile medalists presenting higher values than the other athletes.
On somatic anxiety, the scores emphasize that high levels would be associated with sports failure. 14 Therefore, in somatic anxiety, experience would be a good indicator of this manifestation. In this sense, increasing the athlete's age tends to decrease the chances of presenting great variations in the anxiety of these athletes. 17 Greater maturity would be related to a greater conviviality with the competitive scenario, though this condition has been contradicted by Gonçalves and Belo, 17 regarding the anxiety-trait in young athletes, who did not observe statistically different age factor and experience in combat modalities. However, in the somatic anxiety levels there were significant differences between juvenile medalists and the other groups. 17 Comparatively, Gonçalves and Belo 17 affirms that there is a relationship between anxiety and performance and that this relationship seems to vary according to several other factors, such as type of sport, task difficulty, personality characteristics, among others. The practice

DISCUSSION
The main objective of our study was to evaluate the level of pre-competitive anxiety in male and female adult boxing athletes and their correlation with the final results of the Brazilian National Championship in 2017.
The levels of cognitive anxiety presented significant differences, with medalists presenting lower scores than non-medalists in the juvenile group (12.77 and 15.92 respectively) and in the Adult group, medalists had scores higher than non-medalists (15.23 and 12.00). of a competitive sport would bring with it some particularities such as confrontation, demonstration, comparison, and constant evaluation of participants, making the competition a situation in which the development and performance of athletes are always compared with existing patterns. 18 Parnabas et al. 19 stated that at the time of the medal match, anxiety may exert influence on the athlete: those with greater emotional control would have better results at the moment of competition. Very high levels of anxiety can inhibit athletic performance because athletes tend to distort external perception, causing adverse reactions at decisive moments, especially in combat sports, as the athlete's reaction time and decision making are incisive in the result.
Anxiety is part of the daily lives of several people at different times in their lives and athletes come across it at all times. Thus, athletes tend to have differentiated levels of anxiety, be they high or low, at various times. These anxiogenic levels may vary depending on the situation. 20 Therefore, it has been demonstrated that there should be an ideal level of anxiety for each athlete, considering that the state of intensity should be compatible with the nature of the activity, so that favorable results can be obtained. 17 In this sense, high-performance boxing athletes in Brazil should not only enjoy physical, technical, tactical, nutritional, and medical preparation, but also psychological 16 preparation. This corroborates the findings of our study, taking into account the results obtained recently by Brazilian boxers in the men's junior category who participated in the Continental Championship held in May 2018 in Colorado Springs, USA. On the occasion, they won four gold, one silver, and three bronze medals. The good performance displayed by the Brazilian youthful male boxers has recently been confirmed: the team was crowned champions with five gold and three silver medals in the 9th Belt Gold Cup held in Ecuador in June 2018. These are the best results by a Brazilian team in the base categories. 21

CONCLUSION
From this study we can conclude that psychological factors such as cognitive anxiety tend to influence competitive outcomes, as athletes who are medalists tend to present less cognitive anxiety than non-medal athletes.
All authors declare no potential conflict of interest related to this article