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This study compares the levels of felt arousal and cognitive anxiety between male and female archers across different competition stages. Fifty-seven professional recurve archers (28 men, 29 women) who participated in the Asian Archery Championships were recruited as participants. Their levels of felt arousal and cognitive anxiety were recorded during the stages of qualifying, individual elimination, and team competition using the Sport Grid-Revised. The results showed no sex-based differences in competitive anxiety when competition stages were considered. However, the female archers demonstrated higher levels of felt arousal and cognitive anxiety than the male archers across the different stages. Further, all archers regardless of sex showed higher cognitive anxiety in the individual elimination and team competition stages than the qualifying stage. The findings show sex-based differences in felt arousal and cognitive anxiety before competitions. In addition, increasing cognitive anxiety is likely associated with fundamental differences in levels of competition pressure at various stages of a match. It seems beneficial for athletes to focus on reducing gender stereotypes through preventive interventions and developing effective coping strategies toward competitive anxiety.

The aim of this study was to analyse statistical differences in men's and women's singles badminton competitions at the London and Rio Olympic Games. Forty-five matches (128 sets in total) played at the 2012 and 2016 Olympics in badminton were analysed. Variables related to the match (6) and each set (13) were determined. The results show the longest rally in sets 1 and 3, the biggest come back to win the game in set 2, and that the duration of set 3 for men was longer in Rio than in London. All of the women's sets had longer duration, and the rally length and the number of strokes per rally was also longer in Rio versus London. In conclusion, the timing factors of badminton singles were dissimilar in London 2012 and Rio 2016 for both men and women. This information may help players and coaches manage different workout types or, more specifically, competition schedules that are adapted to suit modern badminton's characteristics., (© 2020 Gema Torres-Luque, Juan Carlos Blanca-Torres, David Cabello-Manrique, Miran Kondric, published by Sciendo.)

The aim of the present study was to determine statistical differences in a set of badminton competition matches in five different modalities with regard to competition level (Group Phase vs. Eliminatory Phase). Data from 453 sets (125 in men's singles; 108 sets in women's singles; 77 sets in men's doubles; 73 in women's doubles and 70 in mixed doubles) from the RIO 2016 Olympics Games were recorded and classified in two groups of variables to analyze variables related to match (5) and set (15). A descriptive analysis and univariate test (Mann-Whitney U) for non-parametric data were conducted. The results show in men's and women's singles all the variables related to match were higher in the Elimination Phase than in the Group Phase ( p < 0.01). In Sets 1 and 3, the longest set duration, rally and average rally were found in the Elimination Phase than Group Stage ( p < 0.05). In women's singles, these differences were also recorded in Set 2. For doubles, the results are more stable among groups. Men's doubles had a longer duration of the match and set (sets 1 and set 2) ( p < 0.01), and also scored highest for average rally strokes (sets 1 3) ( p < 0.05) and shuttles used in the Elimination Phase vs. the Group Phase along the match ( p < 0.01). In women's doubles, more shuttles were used in a match in the Elimination than in the Group Phase. Moreover, the same results are established for Set 2, including for average rally. Mixed doubles saw no match going to three sets. However, the greatest differences showed a longer rally and average rally being registered in the Elimination than in the Group Phase. In conclusion, the timing factors of the badminton singles and doubles games were different in the Elimination and Group Phases. This information may help players and coaches prepare and administer different types of workouts or, more specifically, competition schedules adapted to the characteristics of modern badminton.

Professional ballet is a highly challenging art, but studies have rarely examined factors associated with injury status in ballet professionals. This study aimed to prospectively examine gender-specific correlates of injury occurrence and time-off from injury in professional ballet dancers over a one-year period. The participants were 99 professional ballet dancers (41 males and 58 females). Variables included: (i) predictors: sociodemographic data (age, educational status), ballet-related factors (i.e., experience in ballet, ballet status), cigarette smoking, alcohol drinking, and consumption of illicit drugs; and (ii) outcomes: injury occurrence and time-off from injury. Participants were questioned on predictors at the beginning of the season, while data on outcomes were collected continuously once per month over the study period. Dancers reported total of 196 injuries (1.9 injuries (95% CI: 1.6⁻2.3) per dancer in average), corresponding to 1.4 injuries per 1000 dance-hours (95% CI: 1.1⁻1.7). In females, cigarette smoking was a predictor of injury occurrence in females (OR: 4.33, 95% CI: 1.05⁻17.85). Alcohol drinking was a risk factor for absence from dance in females (OR: 1.29, 95% CI: 1.01⁻4.21) and males (OR: 1.21, 95% CI: 1.05⁻3.41). Less experienced dancers were more absent from dance as a result of injury than their more experienced peers (Mann-Whitney Z: 2.02, p < 0.04). Ballet dancers and their managers should be aware of the findings of this study to make informed decisions on their behavior (dancers) or to initiate specific programs aimed at the prevention of substance use and misuse in this profession (managers).

Table tennis is a racket sport characterised by an intermittent movement profile, including short rallies interspersed with short breaks. In contrast to other racket sports, information is lacking regarding the: (i) physiological responses during table tennis matches and training; and (ii) practical recommendations for enhancing aerobic and anaerobic performance in table tennis by improving cardio-metabolic and neuro-muscular fitness, anthropometry and nutritional strategies. Therefore, this review article attempts to narratively provide an overview of the physiology of table tennis by describing the metabolic mechanisms underlying match play and outlining a framework for practical recommendations for improving cardio-metabolic and neuro-muscular fitness, anthropometry as well as nutritional strategies. A second aim was to stimulate future research on table tennis and to point out study limitations in this context. In general, the most important finding is that the rally duration is short at around 3.5s, with a longer rest time of around 8-20s, resulting in an effort-rest ratio ranging from 0.15 to 0.22 in official matches and energetic demands during match relatively low. Future studies should focus on the relationship between energetic demand and table tennis performance with a view to predicting performance in table tennis using physiological parameters.

The aim of this study was to examine the relationship between cognitive competitive anxiety intensity and coping strategies in table tennis players. One hundred and two (102) US competitive table tennis players of age range from 10 to 60 filled out a Revised Competitive State Anxiety Inventory-2 (CSAI-2R, Cox et al., 2003) at least 30 minutes before the start of their tournament match and a Modified Cope questionnaire (MCOPE; Crocker and Graham, 1995) 15 minutes after they finished their match. Our study found significant differences between low and high cognitive competitive anxiety groups with regard to the use of coping strategies. The high cognitive competitive anxiety intensity group used significantly more behavioral disengagement (avoidance coping, p ≤ 0.05), denial coping strategies (emotion focused coping, p ≤ 0.01) compared to the low cognitive anxiety intensity group. Our results suggest that there is some connection between anxiety intensity and coping strategies. If the cognitive anxiety intensity (for example, intensity from worrying) is very high, an athlete might be more likely to use avoidance coping (such as behavioral disengagement) and emotion-focused coping (such as denial and venting of emotions) compared to athletes who have low cognitive competitive anxiety. Furthermore, gender differences in cognitive anxiety and direction were found. Confidence management techniques such as positive self-talk, breathing techniques and visualization should be taught to athletes to assist them in coping with their competitive anxiety better and to enhance their performance.

Displays of anxiety in table tennis were assessed through subjective (a self-report questionnaire), physiological (heart-rate variability) and kinematic variables. Using a within-group crossover design, 9 university-level table tennis players completed a series of serves under low- and high-anxiety conditions. Anxiety manipulation was achieved through the introduction of a national standard table tennis player, known to the participants, to receive serves in the high-anxiety condition, whilst serves were received by no opponent in the low-anxiety condition. Automated motion capture systems consisting of high-speed 3D motion cameras and analytical software (QUALISYS) determined the subject's movement kinematics: bat face angle (degrees) and serve routine duration (s). Self-reported state anxiety (MRF-Likert) and heart rate measurements were collected to examine changes between conditions. Contrary to the hypothesis, bat face angles did not change significantly between anxiety conditions (F (1.8) = 2.791, p = 0.133) and movement times were faster in the high-anxiety condition. In light of these findings, research into other facets of movement behaviour must be analysed to gain further understanding of the effects of anxiety on performance, which remain unclear.

Agility is an important quality in tennis, yet there is an evident lack of studies focussing on the applicability of tennis-specific agility performances and comparing them to equivalent non-specific agility performances. The aim of this study was to evaluate the reliability and factorial validity of three tests of pre-planned agility, performed in specific (with a tennis racquet) and non-specific (without a tennis racquet) conditions. The sample consisted of 33 tennis players (13 males and 20 females; age: 18.3 ± 1.1 years and 18.6 ± 1.3 years; body height: 185.4 ± 51 cm and 169.3 ± 4.2 cm, 74.0 ± 4.4 kg and 61.2 ± 3.1 kg, respectively). The variables comprised three agility tests: a 20-yard test, a T-test and the Illinois test, all performed in both specific and non-specific conditions. Between-subject and within-subject reliability were found to be high (Cronbach Alpha: 0.93 to 0.98; Coefficient of Variation: 3 to 8%), with better within-subject reliability and stability of the measurement for specific tests. Pearson's product moment correlations between the non-specific and specific agility performances were high (r ≥0.84), while factor analysis extracted only one significant latent dimension on the basis of the Guttman-Kaiser criterion. The results of the 20-yard test were better when the test was conducted in the specific conditions (t-test = 2.66; p < 0.05). For the Illinois test, superior results were recorded in the non-specific conditions (t-test = 2.96; p < 0.05), which can be explained by the test duration (about 20 s) and non-specific locomotion forms such as rotational movements. Considering the findings of the present study, when testing tennis-specific pre-planned agility, we suggest using tests of short duration (less than 10 s) and sport-specific types of locomotion.

Background: Substance use and misuse (SUM), eating disorders (ED) and consequent amenorrhea (AM) occur frequently in professional ballet dancing. The objective of this study has been to explore the prevalence and association between ED, AM and SUM in ballet., Material and Methods: The sample comprised 21 ballet dancers, 23.1±4.5 years old, members of the professional National Ballet Ensemble from Croatia. Variables were collected by questionnaires examining SUM, occurrence of amenorrhea, and corresponding ballet-specific and socio-demographic factors (Questionnaire on Substance Use - QSU) and the level of ED (Brief Eating Disorder in Athletes Questionnaire - BEDA-Q)., Results: Smoking is prevalent in 40% of dancers (25% smoke on a daily basis), 36% often use analgesics, and 25% engage in binge drinking at least once a month. Smoking and binge drinking are less frequent in ballerinas with a higher academic level (r = 0.60 and r = 0.54 for binge drinking and smoking, respectively; p < 0.05). Alcohol drinking is higher among dancers who consume analgesics more often and those with a higher BEDA-Q score (r = 0.53 and r = 0.54 for analgesics and BEDA-Q, respectively; p < 0.05). Amenorrhea is more prevalent among those dancers with a higher BEDA-Q score. Women who consume nutritional supplements are less likely to use analgesics (Mann Whitney U test = 2.11; p < 0.05)., Conclusions: Efforts seeking to prevent ED in ballet should target dancers who consume alcohol to a greater extent. Future studies should specifically explore the less frequent consumption of analgesics among dancers who consume nutritional supplements., (This work is available in Open Access model and licensed under a CC BY-NC 3.0 PL license.)

Aim: The aim of this investigation was to study the physical fitness differences between two qualitative levels of junior water polo players, with regard to their playing positions., Methods: The sample (N.=54, males; 16-18 years of age) comprised 13 members of the Junior National Squad (JNS; 5 centres and 8 perimeter players), and 41 team athletes (TA; 11 centres and 30 perimeter players). The sample of variables included: body height, body mass, BMI and body fat percentage, 20 metres sprint swimming, maximal dynamometric force in eggbeater kick (DF), on-water vertical jump, drive-shoot-speed, and swimming-endurance-test (SET). Differences between JNS and TA were analysed by t-test for independent samples and by a magnitude-based Cohen's effect size (ES) statistic with modified qualitative descriptors. Forward conditional logistic regression (FCLR) was calculated to determine the impact of the physical fitness variables on the dichotomous criterion (JNS vs. TA)., Results: All variables were found to be reliable. The JNS perimeter players performed better (P<0.05) in SET, DF, and sprint-swimming than the TA perimeter players. No significant differences were found for centres. FCLR revealed drive-shoot-speed as the only significant predictor of qualitative level (Y=-12.925 + 1.188 * DSHOOT; OR: 1.023-1.380) CONCLUSION: Fitness capacities are more important as determinants of quality among perimeters than among centres. The results highlight the need for position-specific training programmes in junior water polo.

The aim of this research was to establish the relationship of certain basic motor abilities and morphological characteristics and efficacy in specific table tennis tasks. The research sample consisted of cadet category table tennis players (N = 101; aged 10.52 +/- 0.78 years, training experience 2.8 +/- 0.93 years). The participants were measured as they performed 24 motor tasks, along with 15 anthropometric measures and 3 specific table tennis tests. Indicators of the relationship between morphological characteristics and motor abilities, coupled with the results of the specific table tennis tests indicate that: a) subcutaneous fatty tissue on the lower extremities significantly limits the test results where movements involving fast changes in direction are required; b) subcutaneous abdominal adipose tissues have a positive influence on tasks demanding controlled and precise alternate bouncing of the ball; c) in general, a positive influence can be seen in the results of specific tests concerning the following motor abilities: arm coordination, agility, explosive arm power, movement frequency speed and repetitive leg power. The test used for a coordination assessment of the whole body revealed a negative influence on the success of performing specific tasks.

There is evident lack of studies which investigated morphological influence on physical fitness (PF) among preschool children. The aim of this study was to (1) calculate and interpret linear and nonlinear relationships between simple anthropometric predictors and PF criteria among preschoolers of both genders, and (2) to find critical values of the anthropometric predictors which should be recognized as the breakpoint of the negative influence on the PF. The sample of subjects consisted of 413 preschoolers aged 4 to 6 (mean age, 5.08 years; 176 girls and 237 boys), from Rijeka, Croatia. The anthropometric variables included body height (BH), body weight (BW), sum of triceps and subscapular skinfold (SUMSF), and calculated BMI (BMI = BW (kg)/BH (m)2). The PF was screened throughout testing of flexibility, repetitive strength, explosive strength, and agility. Linear and nonlinear (general quadratic model y = a + bx + cx2) regressions were calculated and interpreted simultaneously. BH and BW are far better predictors of the physical fitness status than BMI and SUMSF. In all calculated regressions excluding flexibility criterion, linear and nonlinear prediction of the PF throughout BH and BW reached statistical significance, indicating influence of the advancement in maturity status on PF variables Differences between linear and nonlinear regressions are smaller in males than in females. There are some indices that the age of 4 to 6 years is a critical period in the prevention of obesity, mostly because the extensively studied and proven negative influence of overweight and adiposity on PF tests is not yet evident. In some cases we have found evident regression breakpoints (approximately 25 kg in boys), which should be interpreted as critical values of the anthropometric measures for the studied sample of subjects.

Nutrition and doping issues are rarely studied in the sport of tennis. The aims of this investigation were to determine knowledge on doping (KD) and knowledge on sport nutrition (KSN), and corresponding socio-demographic-, sport-, and sport-nutrition- and doping-factors among an international sample of high-level tennis players of both sexes (43 females; 22 years old on average). In the first phase of the investigation, the KSN and KD questionnaires were studied for their reliability and validity. The consumption of NS is found to be very high, with almost of all the females and 80% of the males using NS at least occasionally. The athletes showed a low tendency regarding future doping usage, although most of them are convinced that doping does exist in tennis. Since athletes declared that their coaches are their main source of information about NS and doping, future studies should investigate what coaches actually know about such problems. KSN has been found to be protective against potential doping behavior in the future. Males are found to be more prone to doping than females. Therefore, in order to prevent doping behavior in tennis we strongly suggest intensive educational programs on sports nutrition and doping-related problems. Key PointsThe incidence of nutritional supplementation use among the tennis players is found to be very high, especially among the females.Although most of the subjects are of the opinion that the doping behavior is present in tennis circuit, we have found a low tendency regarding future doping usage, and high levels of athletes' trust in their coaches with regard to nutritional supplementation and doping.There are indices that the knowledge about nutrition is protective factor against potential doping behavior. It clearly reinforces the need to include a wide educational program on sports nutrition in tennis, but also in other sports.

Conducted researches recognize various risk factors, as well as protective factors against doping behaviour in different sports i.e. sports disciplines or activities. The main goal of this research was to identify the correlation between selected socio-demographic, health-related, and sports-related predictors with doping factors in three different types of sports, which are (1) highly energetic demanding sports (weightlifting), (2) highly technical demanding sports (racquet sports), and (3) highly tactical demanding sports (sailing). The research consisted of three separate studies, each one of them researching one of the sports. The sample of subjects included altogether 293 athletes, senior level competitors (older than 18years of age). In total, the sample comprised three homogenous sub-samples, as follows: athletes in highly energetic demanding sports (weightlifters and power lifters; N=27), athletes in highly technical demanding sports (table tennis, tennis and badminton players; N=188), and athletes in highly tactical demanding sports (sailing; N=78). The first study involved weightlifters where we should point out the existence of high doping behaviour In this study, religiousness was interpreted as the most significant protective factor against doping behaviour, while sports factors are not found to be significantly related to doping. The study involving racquet sport athletes suggests a high risk of doping behaviour among those athletes who observe doping behaviour in their sport. We noticed low levels of athletes' trust in their coaches' and physicians' opinions on doping issues. This is an issue which should be researched in the future, because the underlying cause has not been studied as yet. Briefly, it seems that either the athletes are not convinced of their coaches '/physicians' expertise regarding doping issues, and/or they do not believe in their good intentions. It is particularly important, as the previous research has shown that with the increased trust in coaches and physicians, the chance that an athlete will use doping decreases. As expected, it is characteristic for sailing that it has a low likelihood of potential doping behaviour, although the consumption of dietary supplements is high. Substance abuse in sports spreads beyond those that enhance athletic performance. All of these issues should be studied in more detail in the future and, if appropriately validated, incorporated into anti-doping intervention programs.

The main aim of this study was to examine the differences in motivation to participate in sport activities among sports students from three different countries. On a sample of 390 sports students from Slovenia, Croatia and Germany we studied what motivates an interest in being sports active. The sample was stratified across the choice to attend table tennis lessons at all three institutions and all students have completed the Participation Motivation Questionnaire (PMQ). The results revealed that the latent structure of the types of sports students' motives consisted of six factors (sport action with friend, popularity, fitness & health, social status, sports events, relaxation through sports). We also found significant sex differences in motivation to participate in sport activities for all sports students from the three different countries. We did not find relevant age-based differences among the students, and this is the only initial hypothesis that we can reject. Key pointsThe potential implications of the result can be in better understanding the relationship between different motivational orientations - in particular, extrinsic motivation - and sport motivation among school-aged individuals.In the context of Self Determination Theory, students can be encouraged in developing more autonomous orientations for sport activity, rather than controlled and impersonal, especially in certain countries.Significant factors of differences have been found in motivation to participate in sport activities among sports students from three different countries and also some significant sex differences have been found in motivation to participate in sport activities for all sports students.

Background: Although dietary supplements (DSs) in sports are considered a natural need resulting from athletes' increased physical demands, and although they are often consumed by athletes, data on DS usage in Olympic sailing are scarce. The aim of this study was to study the use of and attitudes towards DSs and doping problems in high-level competitive sailing., Methods: The sample consisted of 44 high-level sailing athletes (5 of whom were female; total mean age 24.13 ± 6.67 years) and 34 coaches (1 of whom was female; total mean age 37.01 ± 11.70). An extensive, self-administered questionnaire of substance use was used, and the subjects were asked about sociodemographic data, sport-related factors, DS-related factors (i.e., usage of and knowledge about DSs, sources of information), and doping-related factors. The Kruskal-Wallis ANOVA was used to determine the differences in group characteristics, and Spearman's rank order correlation and a logistic regression analysis were used to define the relationships between the studied variables., Results: DS usage is relatively high. More than 77% of athletes consume DSs, and 38% do so on a regular basis (daily). The athletes place a high degree of trust in their coaches and/or physicians regarding DSs and doping. The most important reason for not consuming DSs is the opinion that DSs are useless and a lack of knowledge about DSs. The likelihood of doping is low, and one-third of the subjects believe that doping occurs in sailing (no significant differences between athletes and coaches). The logistic regression found crew number (i.e., single vs. double crew) to be the single significant predictor of DS usage, with a higher probability of DS consumption among single crews., Conclusion: Because of the high consumption of DSs future investigations should focus on real nutritional needs in sailing sport. Also, since athletes reported that their coaches are the primary source of information about nutrition and DSs, further studies are necessary to determine the knowledge about nutrition, DSs and doping problems among athletes and their support teams (i.e., coaches, physicians, and strength and conditioning specialists).

Background: Racket sports are typically not associated with doping. Despite the common characteristics of being non-contact and mostly individual, racket sports differ in their physiological demands, which might be reflected in substance use and misuse (SUM). The aim of this study was to investigate SUM among Slovenian Olympic racket sport players in the context of educational, sociodemographic and sport-specific factors., Methods: Elite athletes (N=187; mean age=22±2.3; 64% male) representing one of the three racket sports, table tennis, badminton, and tennis, completed a paper-and-pencil questionnaire on substance use habits. Athletes in this sample had participated in at least one of the two most recent competitions at the highest national level and had no significant difference in competitive achievement or status within their sport., Results: A significant proportion of athletes (46% for both sexes) reported using nutritional supplements. Between 10% and 24% of the studied males would use doping if the practice would help them achieve better results in competition and if it had no negative health consequences; a further 5% to 10% indicated potential doping behaviour regardless of potential health hazards. Females were generally less oriented toward SUM than their male counterparts with no significant differences between sports, except for badminton players. Substances that have no direct effect on sport performance (if timed carefully to avoid detrimental effects) are more commonly consumed (20% binge drink at least once a week and 18% report using opioids), whereas athletes avoid substances that can impair and threaten athletic achievement by decreasing physical capacities (e.g. cigarettes), violating anti-doping codes or potentially transgressing substance control laws (e.g. opiates and cannabinoids). Regarding doping issues, athletes' trust in their coaches and physicians is low., Conclusion: SUM in sports spreads beyond doping-prone sports and drugs that enhance athletic performance. Current anti-doping education, focusing exclusively on rules and fair play, creates an increasingly widening gap between sports and the athletes' lives outside of sports. To avoid myopia, anti-doping programmes should adopt a holistic approach to prevent substance use in sports for the sake of the athletes' health as much as for the integrity of sports.

On the sample of 83 top Slovenian athletes we have studied the frequency of injuries among table tennis, tennis and badminton players, types of injuries and severity of injuries--the latter based on data of players absences from training and/or competition processes. The most liable parts to injuries are shoulder girdle (17.27%), spine (16.55%) and ankle (15.83%), while foot (10.07%) and wrist (12.23%) are slightly less liable to injuries. The most frequent injuries in racket sports pertain to muscle tissues. According to this data, the majority of injuries occur halfway through a training session or a competition event, mostly during a competition season. The injuries primarily pertain to muscle tissues; these are followed by joint and tendon injuries. There are no differences between male and female players. Compared to other racket sports players, table tennis players suffer from fewer injuries.

Substance use and misuse (SU&M) is regularly studied in sports, but we have found no such data for table tennis. We have studied SU&M in athletes competing at the Slovenian Nationals 2008-2009 (responding rate was 100%; 50 males and 29 females; aged 18 years or older). The anonymous questionnaire for studying SU&M and corresponding educational, socio-demographic, and sport factors was used. More than 90% of all the athletes included in our study do not rely on coaches' and/or physicians' opinion regarding nutritional supplements and doping. Chi-square test revealed higher prevalence of binge drinking, cigarette smoking, and potential doping behavior in males. In both genders, with the advancement of the sport status, the probability for potential doping behavior increases. In conclusion, we strongly suggest permanent SU&M educational programs for table tennis athletes as well as for their coaches and physicians.

Team position is of extreme importance in interpretation of morphological data because there are specific demands for a specific play position. The aim of the study was the analysis of morphological characteristics and body composition of elite Croatian soccer players with respect to their team position. The measurements were performed on 57 soccer players, members of the First Croatian National League. The anthropometrical measurement encompassed 13 variables. Descriptive statistics, t-test and MANOVA were used in data processing. The goalkeepers were the tallest and the heaviest (182.9 +/- 4.3 cm; 80.1 +/- 5.1 kg), and had significantly higher amounts of body fat (20.2% goalkeepers vs. 13-15% others; p < 0.05), whereas the forwards and the midfield players were on the average about 3 cm shorter. The goalkeepers had longer legs and arms (p < 0.05), and the largest biacromial diameter (43.2 +/- 1.9 cm). The forwards were the shortest on the average (179.2 +/- 6.3 cm). The lowest values of fat tissue were found in defenders (13.9%) and midfield players (14.4%). In conclusion, the differences in morphological characteristics according to the team position were noticed only in goalkeepers, especially regarding their height, weight and the percentage of fat tissue.