International Journal of Performance Analysis in Sport 2011, 11, 228-239. Differences in Situational and Morphological Parameters between Male Soccer and Futsal - A Comparative Study Mario Jovanovic1, Goran Sporis1 and Zoran Milanovic2 1 2 Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia Faculty of Sport and Physical Education, University of Nis, Nis, Serbia Abstract The purpose of this study was to determine similarity and differences in morphological and situational parameters between futsal and soccer. The research was conducted on a sample of 82 subjects: 40 male futsal players and 42 male soccer players. In addition to height and body mass eight other anthropometric measures were presented. Situational parameters were represented by nine variables. Effect size of variables ranged from 0.001 to 0.062. Statistically significant difference was not determined among futsal and soccer players in the parameters of morphological characteristics. Futsal and soccer players have showed significant differences in the parameters of the number of gained possessions of the ball and number of runs with the ball at the level of significance p< 0.01. The other situational efficiency variables have shown no significant difference between these two types of team sports. The results of this study have shown that the futsal and soccer players differ only in two situational parameters. The difference in morphological variables was not found due to the fact that futsal players were mainly ex-soccer players. This finding suggests that futsal needs more specialized approach when starting in this sport. Key words: anthropometry, focus system, comparison, team sport, indoor soccer 1. Introduction When we talk about soccer and futsal we can say that these are the two sports that are at first glance very similar in performance characteristics. The main common characteristic is that these are team sports with intermittent high-intensity activities (Barbero-Alvarez, Soto, Barbero-Alvarez, & Granda-Vera, 2008; Bangsbo, Norregaarg, & Thorso, 1991; Ben Abdelkrim, El Fazza, & El Ati, 2007) where the lower extremities play the key role for controlling the ball. Futsal is known as an indoor version of soccer, demanding sport with growing specificities in morphological and motor demands (Barbero-Alvarez et al., 2008; Barbero-Alvarez, D'Ottavio, Granda-Vera, & Castagna, 2009). Such specificities in morphological and motor demands could be seen as the reason for the separation of futsal 228 and its progressive development which would lead to earlier selection of players with predispositions to play futsal. In order to be able to analyze and register the soccer game it is necessary to have an objective measurement method that is able to record every move that player makes with the ball (Hartmann, Holzer, & Beetz, 2003). Argilage and Jonsson (2003) stated in their study that conventional soccer analysis mainly focused on elementary statistics provides information on the frequency and field distribution of players' passing, shots on goal and defensive systems. The results obtained by these authors have shown that the attempts to identify actual events during the game, especially in competitive conditions, were successfully performed in soccer while it was not the case in futsal. The data such as number of attacks, areas of field in which the attacks take place, number of passes per unit of game and the number of shots on goal, are the basis for the programming of training and preparation of players (Bishovets, Gadajev, & Godik, 1993). The collected data in this way helps in finding the answer to many problems. Jerkovic and Barisic (1997) found a significant correlation (ICC = 0.73) among unsuccessful passing, receiving the ball, gained ball possessions and conceded goals. Miljkovic and Barisic (2002), analyzing the soccer match between Brazil and Scotland, concluded that it had different styles of attacking which represents two different schools of soccer. Support analyzes of the game with computer combines image processing, visual elements and multimedia resources. Recent development of technology has led to a fully digital solution to the analytical composition of the game. It is in players’ interest to raise the practice to a higher level by detailed analysis of situational behavior of their own or the opposing team. Intensity during the futsal match was almost 90% of the maximum heart rate (BarbaroAlvarez et al., 2008) while in soccer is lower and ranges from 80 to 90% of maximum heart rate (Reilly, 1994). In futsal, running in high intensity mode is represented by 13.7% while sprint occupies about 8.9% during the match (Barbaro-Alvarez et al., 2008) in contrast to soccer where this kind of movement occupies about 11% (Baros et al., 2007; Reilly, Bangsbo, & Franks, 2000). Doğramaci and Watsford (2006) have pointed out that futsal players spend 26% during the match in high-intensity level, which is a direct consequence of futsal rules that offer the possibility of more frequent changes than soccer. The reduced dimensions of the field in Futsal affects the constant marking of opposing players and a much higher level of pressing play and situations 1vs1 (Vaeyens, Lenoir, Williams, & Philippaerts, 2007). In contrast to the dimensions of the field, which is obviously different between futsal (38-42 x 18-25 m) and soccer (100-110 x 64-75 m), match duration was nearly equal. Futsal consists of two halves of 20 minutes while in soccer one half last 45 minutes. However, the futsal rules allow stops during the match so that the total duration of the futsal match is about 70-80 minutes (Barbero-Alvarez et al., 2008) which is similar to the duration of a soccer match (90 minutes). Compared to soccer technical profile, futsal players are closely associated with a lower volume of the ball in futsal, forcing the players to respond technically more quickly and accurately while manipulating the ball (Burns, 2003; Goncalves, 1998). 229 The important question that could be drawn from existing differences concerns the difference in morphological and especially in the situational parameters between soccer and futsal players. In the available literature several researches exist on the morphological differences among soccer players (Da Silva, Kaissa, & Gomes, 1999; Da Silva, Osieck, Arruda, Moura, & De Campos, 2001; Gallo, Ortega, Batista, & Liotta, 2002; Guerra, Chaves, Tirapegui, & Barros, 2002). The majority of the researches gave only the parameters of body height, body weight and fat percentage (Arnason et al., 2004; Aziz & Chin, 2000; Bunc & Psotta, 2001; Casajus, 2001). Rienzi, Drust, Reilly, Carter, and Martin (2000) indicate the importance of anthropometric parameters as a factor of success in the sport. To our knowledge there are no studies that analyze the similarities and differences in morphological and situational parameters between futsal and soccer. Therefore the aim of this study was to determine the similarities and differences of morphological and situational parameters between futsal and soccer. 2. Methods 2.1. Subjects The research was conducted on a sample of 82 subjects divided in two groups: 40 futsal players (body mass = 70.39 ± 5.33 kg, body height = 176.26 ± 6.85 cm) and 42 soccer players (body mass = 70.86 ± 5.65 kg, body height = 175.42 ± 5.95 cm). Soccer and futsal players in this research were taken from the first Croatian football and futsal league. Criteria for selection of players was that they have played at least 80% matches of the season with time spent in the game of soccer for 75 minutes and in futsal for more than 15 minutes. All players were fully informed and they signed a consent form. The study protocol was held for every subject. The study was approved by the Ethics Committee of the Faculty of Kinesiology, University of Zagreb. Subjects were admitted in the study if they had a minimum training age of 3 years, engaged in strenuous training at least 10 h per week and were currently active in competition. 2.2. Procedure Morphological parameters were measured according to the instructions of the International Biological Program–IBP. All anthropometric variables were measured with a GPM anthropometer (Siber & Hegner, Zurich, Switzerland) to the nearest 0.1 cm. For the estimation of situational parameters the Focus X3 system was used (Elite Sport Analysis, United Kingdom). Anthropometric variables were: Body height (BH), body mass (BM), leg length (DN) foot length (DP), knee diameter (DIK) ankle diameter (DISK), thigh circumference (ON), calf circumference (OP), thigh skinfold (KNN), calf skinfold (KNP). Situational variables were: Number of passes to a teammate (BRD), number of received balls from teammate (BRP), number of gain possessions of the ball (BOL), number of runs with the ball (BRV), number of dribbling moves (BRDR), number of shots on a goal 230 (BRU), number of actions taken with the foot (BRAN), number of actions taken with the head (BRAG), number of actions taken with the body (BRAT). Situational parameters are obtained by analyzing all the games of the first period of Championship 2009/2010 as in futsal so in soccer and the average value per game for each player was interpreted. 2.3. Data analysis The statistical Package for Social Sciences SPSS (v18.0, SPSS Inc., Chicago, IL) was used for the statistical analysis. Descriptive statistics were calculated for all experimental data. Kolmogorov-Smirnov test was used to test if data were normally distributed. Statistical power was calculated using G-power software. Effect sizes (ES) were calculated by Cohen’s suggested method (Cohen, 1988) for the magnitude of treatment effects within groups. Reliability of data was presented using Cronbach’s Alpha coefficient for both groups. The significance of differences between soccer and futsal players was determined by one-way univariate analysis of variance (ANOVA). We used the Bonferroni correction for the level of significance, so the level was p < 0.0026. Pearson’s correlation coefficients were used to present relationship between situational and anthropometric variables of futsal and soccer. 3. Results The Kolmogorov-Smirnov test has shown that data was normally distributed. Statistical power was 0.95. The values of body height were 0.48% lower in soccer players than in futsal players with a small effect size (ES = 0.004). In contrast, body weight was higher in soccer players for 0.67% (ES = 0.001). The only anthropometric variable, in which the effect size was medium, was DP (ES = 0.062). Other variables had small effect size ranging from 0.001 to 0.033. Reliability expressed by Cronbach’s Alpha of futsal anthropometric and situation variables were 0.76 and 0.79, while soccer showed 0.70 and 0.83. Percentage difference in the average values of morphological variables between soccer and futsal players were in the range of 0.48% (BH) to 6.85% (KNP). Statistically significant difference was not determined between futsal and soccer players (Table 1) in the parameters of morphological characteristics. In contrast to the morphological characteristics, the largest percentage difference was found in BOL and BVL variables concerning the parameters of situational efficiency and it counted 114% (Table 2) with a very large effect size for both variables (ES = 0.217). The medium effect size was present in a number of actions taken with the foot (ES = 0.066) with 20% of the difference between soccer and futsal players. The effect size for other variables was small and the values ranged from 0.000 to 0.023. Futsal and soccer players have showed significant differences in the parameters of the number of gained possessions of the ball and number of runs with the ball at the level of significance p < 0.001 (Table 2). The other situational efficiency variables had no significant difference between these two types of team sports. 231 Relationships between situational and anthropometric variables indicate that only in soccer there is significant correlation between number of action taken with foot and calf circumference (Table 3 and 4). 232 Table 1. Basic descriptive parameters and ANOVA results of anthropometry variables. Mean±SD ANOVA F Sig. Futsal Soccer Total % ES N=40 N=42 N=82 .352 .555 BH (cm) 176.26±6.85 175.42±5.95 175.83±6.35 0,48 0.004 .154 .696 BM (kg) 70.39±5.32 70.86±5.65 70.64±5.47 -0,67 0.001 2.698 .104 DN (cm) 76.88±3.95 75.61±2.97 76.23±3.52 1,65 0.033 5.332 .024 DP (cm) 26.03±1.18 25.47±1.05 25.74±1.14 2,15 0.062 2.743 .102 DIK (cm) 9.68±0.47 9.85±0.45 9.76±0.46 -1,76 0.033 .353 .554 DISK (cm) 7.60±0.41 7.65±0.34 7.62±0.38 -0,66 0.004 .486 .488 ON (cm) 55.28±3.28 54.85±2.14 55.06±2.75 0,78 0.006 .653 .421 OP (cm) 36.19±1.97 36.51±1.57 36.35±1.77 -0,88 0.008 .549 .461 KNN (mm) 9.79±3.87 10.36±3.10 10.08±3.48 -5,82 0.006 1.293 .259 KNP (mm) 6.28±1.97 6.71±1.45 6.50±1.73 -6,85 0.016 Body height (BH), body mass (BM), leg length (DN) foot length (DP), knee diameter (DIK) ankle diameter (DISK), thigh circumference (ON), calf circumference (OP), thigh skinfold (KNN), calf skinfold (KNP), ES - effect size, % - percentage difference between group 233 Table 2. Basic descriptive parameters and ANOVA results of situation variables. ANOVA Mean±SD Futsal N=40 Soccer N=42 Total N=82 % ES F Sig. 1.246 .268 BRD 356.20±198.72 306.61±203.23 330.80±201.35 13,92 0.015 1.246 .268 BRP 111.31±62.10 95.82±63.51 103.37±62.93 13,92 0.015 22.134 .000 BOL 76.41±42.63 163.88±109.94 121.21±94.49 -114,47 0.217 22.134 .000 BRV 29.85±16.65 64.01±42.95 47.35±36.91 -114,44 0.217 1.246 .268 BRDR 125.07±69.77 107.66±71.36 116.15±70.70 13,92 0.015 1.892 .173 BRU 22.35±6.89 24.57±7.63 23.48±7.32 -9,93 0.023 5.663 .020 BRAN 16.35±6.89 13.06±5.61 14.67±6.45 20,12 0.066 .022 .883 BRAG 3.55±5.20 3.38±5.13 3.46±5.13 4,79 0.000 1.259 .265 BRAT 1.29±3.49 .54±2.48 .91±3.02 58,14 0.015 Number of passes to a teammate (BRD), number of received balls from teammate (BRP), number of gain possessions of the ball (BOL), number of runs with the ball (BRV), number of dribbling moves (BRDR), number of shots on a goal (BRU), number of actions taken with the foot (BRAN), number of actions taken with the head (BRAG), number of actions taken with the body (BRAT), ES - effect size, % - percentage difference between group, statistical significance p<0.01. 234 Table 3. Correlations between situational and anthropometric variables in futsal. BH BM DN DP DIK DISC BRD -.047 -.086 -.024 -.078 .015 -.328 BWP -.047 -.086 -.024 -.078 .015 -.328 BOL -.047 -.086 -.024 -.078 .015 -.328 BRV -.047 -.086 -.024 -.078 .015 -.328 BRDR -.047 -.086 -.024 -.078 .015 -.328 PRG -.047 -.086 -.024 -.078 .015 -.328 BRAN -.047 -.086 -.024 -.078 .015 -.328 BRAG -.056 .124 -.045 -.016 .131 -.189 BRAT -.190 -.020 -.172 -.190 -.012 -.352 Table 4. Correlations between situational and anthropometric variables in soccer. BH BM DN DP DIK DISC BRD -.035 -.085 .004 .126 -.024 .056 BWP -.035 -.085 .004 .126 -.024 .056 BOL .136 -.030 .140 .277 .115 .118 BRV .136 -.030 .140 .277 .115 .118 BRDR -.035 -.085 .004 .126 -.024 .056 PRG .037 -.079 .057 .188 .030 .084 BRAN -.093 -.135 -.048 .041 -.068 .033 BRAG .101 -.109 .092 .091 -.234 -.286 BRAT .213 .012 .080 .121 .057 -.214 *-Statistical significance p=0.045 235 OP .125 .125 .125 .125 .125 .125 .125 .329 .278 ON .082 .082 .082 .082 .082 .082 .082 .255 .201 KNN -.004 -.004 -.004 -.004 -.004 -.004 -.004 .103 .090 KNP -.090 -.090 -.090 -.090 -.090 -.090 -.090 .013 .022 OP -.203 -.203 -.132 -.132 -.203 -.172 -.311* .047 .083 ON -.012 -.012 .095 .095 -.012 .033 -.050 -.211 -.211 KNN -.078 -.078 -.049 -.049 -.078 -.069 -.008 -.159 -.139 KNP -.167 -.167 -.178 -.178 -.167 -.177 -.097 -.097 -.137 4. Discussion and Conclusion The average values of players’ body height and body mass are similar or slightly higher than the values of the national team players’ of Singapore and the first League players’ of Iceland and Hong Kong (Arnason et al., 2004, Aziz, Chin, & Тeh, 2000; Chin, So, Yuan, Li, & Wong, 1994). Body height of futsal players is similar to the one found in the study conducted among Spanish professional futsal players. The study has also shown that Spanish players were slightly heavier (76.9 kg) (Gorostiaga et al., 2009). With the analysis of morphological variables, it can be stated that there is great similarity between futsal and soccer players. This similarity is reflected in all analyzed dimensions of body. The results of this study partially confirm the conclusion of Gorostiga et al. (2009) who have found that between Spanish futsal and soccer players there were no statistically significant differences in height, weight and fat-free body mass. The only statistically significant difference found in that research was in the thickness of subcutaneous fat, contrary to the results of this research. The morphological characteristics are an important factor in the selection of players of team sports (Rienzi, Drust, Reilly, Carter, & Martin, 2000) but in Croatia there is still no orientation selection from the earliest period to the futsal but only to soccer, where later, they are directed to futsal. Therefore, the similarity of soccer and futsal players in the morphological parameters is seen as direct consequence of a single base in the selection of players in the earliest period. Tactical, technical dimensionality of futsal show a tendency to create its own identity through specialization and focus (Barbero-Alvarez et al., 2008; Castagna, D'Ottavio, Granda-Vera, & Barbero-Alvarez, 2008) apart from soccer. The importance has been given to this idea by using of motion analysis, which showed that the futsal players were closer to basketball and handball players than soccer players in the parameters of total distance covered and distance covered in different intensity (Castagna et al., 2008). In contrast to that, the results of this study have shown that the futsal and soccer players differ only in the number of gained ball possessions and in the number of runs with the ball while the other parameters showed no statistically significant difference. This difference could be explained by the fact that the ball in Futsal is smaller compared to soccer and these two situational-technical parameters are directly dependent on the size of the ball. The BRV is also affected by the size of the field so the bigger field in soccer gives a greater possibility of keeping the ball in contrast to futsal which is mainly represented by the game situations 1 vs. 1 (Vaeyens et al., 2007). Other examined variables have also included possession of the ball but for their demands the technical training of players is crucial and not the volume of the ball. The similarity in the frequency of the main technical sessions during small-sided games of soccer have shown that the size of the field was not the main determinant in the number of actions (Kelly & Drust, 2009) as it has been confirmed by our investigation, where there was no difference between the number of actions played with the head, body and foot, 236 although the dimensions of the court were different. Smaller field in futsal could affect the total number of shots on the goal as confirmed by Kelly and Drust (2009) research that recommends to coaches the reduction of the field in order to increase the number of shots on goal. Such fact does not support the results gained in this research. Relationship between situational and morphological parameters show that there are no significant correlation in futsal, while in soccer there is negative impact of calf circumference and the number of actions taken with foot. Although significant (r=-0.311 with p=0.045), authors found no practical significant implication that could be interpreted with sufficient scientific evidence. The results have shown that the futsal and soccer, as the team sports, are very similar in morphological characteristics with some differences in situational parameters that depend primarily on the volume of the ball. The results obtained in this study could be explained by the fact that in Croatia still doesn’t exist a school in which the novice players would start with futsal training from the beginning. Most futsal players first pass the school of "big soccer" and later they move to the futsal. 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