Česká kinantropologie 2014, vol. 18, no. 3, p. 41 – 49 Kinanthropometric parameters of swimmers placed in talented youth groups* Viera Smerecká & Pavel Ružbarský Faculty of Sports, University of Prešov in Prešov, Slovakia Abstract The aim of the study was to determine the kinanthropometric parameters of swimmers placed in talented youth groups of the Slovak Swimming Federation, related to their swimming specialisation. The selected group consisted of 35 swimmers (13 boys and 22 girls), and the average age of the group was 13.8 years. The following basic anthropometric indicators were recorded: body height, body weight, ten skinfolds, and width parameters: epicondylus humeri, epicondylus femoris and thigh and arm circumference. A standard anthropometric set was used in order to gain the data, which served as a basis when determining the subcutaneous fat percentage and the somatotype by means of Somato software. Based upon the information obtained, the swimmers were consequently divided into five categories of motor performance, reflecting the relation between the somatotypes and kinetic abilities of the swimmers. The swimming specialisation was determined by the performances with the highest points scored during the calendar year. The results of the selected group point at a significant heterogeneity of kinanthropometric parameters. It is highly probable that, when selecting a swimming discipline specialisation, the somatotype requirements of particular swimming styles were not taken into consideration. Ectomorphic component was dominant with 51.4% and the average somatotype was 2.7–3.2–4.3 for boys and 3.6–3.0–4.0 for girls. The average value of subcutaneous fat was defined as low, 11.8% at boys and reduced, 16.2% at girls. Predominant category of five categories of motor performance was determined as D at boys and A at girls. Key words: Somatotype, Young talented swimmers, Swimming stroke and discipline specialization, Subcutaneous fat, Category of motor performance. Introduction Psychologist William Sheldon classified people according to three body types – endomorphs, mesomorphs and ectomorphs. Many coaches follow this concept, while others believe the generalisations are not sufficient and every individual possesses many other qualities, which are to be studied prior to the training program formation. In general, the somatotypes suggest their importance in relation to the actions of an organism to a training load (Likness, 2011). Factors that determine the body structure, its size and muscularity, or the structure of anatomic components of a human body, were analysed by Dovalil et al. (2002). According to Dovalil (2002), the somatic factors are relatively stable in time, and their ˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉ * The paper makes part of the research project VEGA No. 1/1020/11. 41 genetic determination is verifiable. From the individual perspective these concerned with muscles, skeleton, ligaments and tendons. Dovalil et al. (2002) and Moravec et al. (2004) include among the main somatic factors the body height and weight, the length dimensions and proportions, the body structure, and the body type – somatotype. Somatotype is a structural factor when increasing the aerobic preparedness and may be helpful when identifying the talented individuals for long-distance swimming disciplines. However, it is not simple to exactly determine the influence of the somatotypetraining interaction effect on the aerobic capacity factors (Chaouachi & Chaouach & Chamari & Chtara & Feki & Amri & Trudeau, 2005). Empirically verified studies have proved that the important factors, more or less determining the potential performance of an athlete in a particular discipline, definitely include the whole scale of anthropometric parameters. Almost every single sports discipline has created some characteristic somatotypes, which help the trainers to determine, which somatic parameters an individual should possess of, related to the particular sports discipline (Urban & Kandráč, 2010, p. 141). “Body structure can play an important part when determining the swimming performance level” (Faulkner, 1967, p. 33). Swimming performance is mostly determined by the anatomic factors, such as the body dimensions and proportions, water resistance influence by the size of a body intersection, the appropriate strength, especially that of arms and torso, explosiveness (short distances) and endurance abilities (long distances). Secondly, mastering the swimming technique and coordination of movements is important, along with flexibility of a shoulder joint (backstroke, front crawl and especially butterfly), femoral joint, ankle and torso (Grasgruber & Cacek, 2008). “Timely determination of the somatotypes of athletes helps to improve their performance and body development according to their needs, especially according to the individual sports and disciplines” (Nigam, 2011). “Certain somatotypes have particular morphological predispositions for kinetic activity, whereas the variety of reactions to a physical load provides diversified outcomes, so it is manifested with various somatotypes miscellaneously” (Urban & Kandráč, 2012, p. 237). Aim Determine the kinanthropometric parameters of swimmers placed in talented youth groups of the Slovak Swimming Federation, related to their swimming specialisation. Methods The monitored group consisted of swimmer of the Slovak national junior swimming team, preparing for the top level junior events, such as World Championship and EYOF. The group consisted of 35 swimmers divided into two sex groups – 13 boys and 22 girls, averaging 13.8 years of age. Basic anthropomorphic values were recorded: body height (cm), body weight (kg), ten skinfolds (mm) of head (face), neck (chin), chest I., chest II., torso (abdominal), suprailiac, subscapular, triceps, thigh, medial calf; width parameters (cm) of epicondylus humeri, epicondylus femoris and perimeter of an arm and thigh. In order to gain the data we used a standard anthropometric set, consisting of a stadiometer, scales, a little adjustable calliper, a skinfold calliper measuring and a rolling meter. By means of a Somato software, based upon the data gained a somatotype and fat percentage were determined. These information help when dividing the swimmers 42 into five categories of motor performance according to Chytráčková (1989), which represented the relation between a somatotype and motoric abilities. The division of somatotypes by Štěpnička (1977), modified by Chytráčková (1989), defines 5 somatotype categories according to the motoric ability. In order to evaluate the motoric ability, 9 tests of fundamental motoric skills and 1 test to determine the explosive strength of arms and shoulder girdle were used. Chytráčková (1989) defines the five somatotype categories according to the motoric ability as follows: Category A includes children with an average or under-average performance predispositions for speed, endurance and motor skills. They possess good constituent predispositions for absolute power manifestation. Endomorphic component represents 4–4.5 pts, mesomorph is at 3 or above. Category B includes the most all-round and universal children, who have very good predispositions for general physical performance, and high motoric activity is characteristic of this category. Isomorphic component is the dominant one; endomorph is not greater than 2pts. Category C represents obese children, possessing the worst physical predispositions. The motoric activity is low, motivation and paying attention to all the types is highly needed with this category. Physical performance is usually under par in all aspects. Endomorphic component is the dominant one (5pts or above). Category D represents slim and gracile children, with very good predispositions for cardiovascular endurance and motor skills. It is necessary to form the body by means of preventive and precautionary exercising, since the body poise and posture is often fault and incorrect. Ectomorph is the dominant component of this category. Category E is commonly very scarcely represented. It includes the individuals with bad motoric predispositions. Low level of performance is likely caused by the low representation of the mesomorph component of a somatotype. It is important to note that the above categorisation is not valid once the puberty has been cleared. Swimming specialisation was determined upon the results with the highest point values for a calendar year. In order to determine the relation between the variables towards the somatotypes particles and swimming specialisation, a non-parametric correlation of Kendall was used. The results were evaluated at the 0.01 and 0.05 significance level. Results and Discussion The studies confirm that within a majority of sports it is possible to observe concentration of somatotypes in a particular area of a somatograph, depending upon the particularities of an individual discipline. In individual sports it is essential to determine a somatotype, as it greatly influences the level of a performance (Pavlík, 2011). In our group an average somatotype was 3.3–3.1–4.1, classified as a mid-somatotype, i.e. for boys 2.7–3.2–4.3 (Table 1), for girls 3.6–3.0–4.0 (Table 2). Ectomorph, mainly mesomorphic, was the most frequent, represented by 51.4%, in groups of both sex. In a study focused on kinanthropometric parameters in swimming was an average somatotype of male swimmers 253 and of female swimmers 343 (Carter & Ackland, 1994). In comparison to our group the endomorph and ectomorph is represented less, unlike the mesomorph, which dominates both the constitute types. The development phase of the swimmers of our group could be the reason for the difference. “During the accelerated growth phase of boys (14–16 years) we notice ‘slendering’ of somatotypes. The average mesomorphic values of the adult age can be estimated roughly at the age of 17 years” (Grasgruber & Cacek, 2008; Malina & Bouchard, 1991). 43 Table 1 Anthropometric indicators and date of swimming specialisation of male swimmers B Age BH (cm) BW (kg) B.M. 14.3 177.4 62.4 235 mesomorph ectomorph 8.8 C.M. 14.3 184.4 68.6 135 mesomorph ectomorph V.D. 13.8 174.8 56.5 235 T.M. 14.1 171 55.9 K.J. 15.0 184.8 T.N. 13.6 T.R. 14.1 Somatotype % fat Category SS Very low D 50 VS, 100 VS 7.4 Very low D 100 VS mesomorph ectomorph 10.1 Low D 200 VS, 200 PP 135 mesomorph ectomorph 8.7 Very low D 200 VS 65.8 135 mesomorph ectomorph 7.9 Very low D 200 P, 50 P 161.6 51.2 244 mesomorph ectomorph 10.5 Low D 800 VS, 1500 VS 198.0 82.3 335 balanced ectomorph 10.6 Low A 100 VS, 100 Z T.J. 18.0 186.00 73.00 435 endomorph ectomorph 15.3 Normal E 200 PP, 200 VS T.R. 14.5 199.6 84.7 425 endomorph ectomorph 15.8 Normal E 100 VS, 100 Z L.U. 14.9 178.2 78.6 352 endomorph mesomorph 12.0 Lowered A 800 VS P.D. 14.1 168.6 55.3 434 mid somatotype 14.1 Normal E 1500 VS, 800 VS N.D. 16.1 181.0 69.0 334 mid somatotype 15.9 Normal A 50 Z, 100 VS J.F. 13.6 168.2 70.1 542 mesomorph endomorph 16.8 Increased A 800 VS, 400 VS x 14.6 179.5 67.2 334 mid somatotype 11.8 Low – – Legend: B – boys, x – average value, SS – swimming specialisation, category – category of motor performance. Carter (1984) in: Grassugruber & Cacek (2008) states the average somatotype of Montreal Olympics in 1976 was for male swimmers 2.1–5.1–2.8, and for female it was more homogenous at 3.2–3.9–3.0. The study of Ackland et al. at the WCH in Perth 1991 provides almost the same values, with a slight decrease of an endomorph. Individuals with a significant ectomorph component manage the endurance activities with an ease. The ectomorph is characterised with a significantly lower fat-free substance, a great part of which is represented by muscles. In case of a mesomorph component a skeleton and massive muscularity are dominant. Mesomorph and meso-ectomorph individuals show a more significant improvement of the aerobic capacity after the aerobic training, and these individuals appear to be pre-equipped to profit from an aerobic training. Cureton (1947), when studying the samples of swimmers participating in two OG, found out that the average somatotype for swimmers was approximately 3–4–3 and 4–5–4. Sprinters are more likely to be ecto-mesomorph constitute types and mid-distance swimmers endo-mesomorph types. In our monitored group the relation between the variables of subcutaneous fat and swimming distance was positive (0.307) at the 0.01 significance level, as much as in relation between the endomorph component and swimming distance (0.261) at the 0.05 significance level. The endomorph component is characterised by a good potential for increasing of muscle substance, but reduction of a subcutaneous 44 fat seems to be its problem. In Cureton (1951) study the swimmers of 400 yards and 1500 m had higher values of the endomorph component, whereas the sprinters had higher values in the mesomorph constituent. Body height and fat-free weight proved to be the important correlatives with the swimming performance/level of female sprint swimmers (Siders & Lukaski & Bolonchuk, 1993). Table 2 Anthropometric indicators and date of swimming specialisation of female swimmers G Age BH (cm) BW (kg) F.N. 11.2 155.6 41.6 235 mesomorph ectomorph 6.9 K.B. 12.7 162.6 47.8 235 mesomorph ectomorph H.K. 12.2 164.9 46.3 225 L.L. 12.8 159.1 43.7 P.A. 11.8 160.0 Š.T. 12.1 L.L. Somatotype % fat Category SS Very low D 100 PP, 200 PP 5.2 Very low D 100 PP, 400 PP balanced ectomorph 7.2 Very low A 100 Z, 200 Z 335 balanced ectomorph 12.5 Low A 1500 VS, 200 VS 39.2 336 balanced ectomorph 13.9 Low A 200 Z, 400 VS 160.0 45.7 335 balanced ectomorph 11.7 Very low A 100 VS, 100 M 14.9 168.0 53.3 335 balanced ectomorph 18.0 Lowered A 1500 VS, 800 VS S.M. 14.0 173.5 58.1 425 endomorph ectomorph 20.2 Normal E 400 VS, 50 Z K.S. 12.2 161.6 47.8 325 endomorph ectomorph 9.6 Very low E 200 P, 100 P B.B. 11.7 159.8 52.3 433 mid somatotype 14.5 Very low A 200 PP, 200 P B.E. 12.7 159.7 48.4 334 mid somatotype 9.5 Very low A 100 VS, 200 VS M.M. 13.1 161.3 52.7 433 mid somatotype 17.3 Lowered A 100 Z S.D. 12.8 161.7 48.9 334 mid somatotype 9.9 Very low E 100 PP, 200 Z F.N. 13.3 170.6 60.4 333 mid somatotype 14.6 Low A 200 PP, 400 PP F.N. 13.8 171.6 61.2 444 mid somatotype 24.9 Increased A 200 PP, 400 PP S.A. 12.9 161.5 55.7 543 mesomorph endomorph 18.8 Lowered A 100 PP, 200 Z B.E. 14.6 165.0 61.4 432 mesomorph endomorph 17.5 Lowered C 400 PP, 200 PP B.E. 15.0 165.5 61.8 642 mesomorph endomorph 26.5 High C 400 PP, 200 PP L.L. 15.3 168.7 56.7 534 ectomorph endomorph 28.5 High E 1500 VS, 800 VS S.M. 14.5 173.3 58.3 625 ectomorph endomorph 26.6 High E 400 VS, 50 Z M.C. 14.1 167.1 65.3 442 mesomorph endomorph 19.1 Normal A 100 M, 200 M M.C. 14.5 167.6 65.8 442 mesomorph endomorph 23.6 Increased A 200 M, 100 M x 13.3 164.5 53.3 434 mid somatotype 16.2 Lowered - - Legend: G – girls, x – average value, SS – swimming specialisation, category – category of motor performance. 45 The average value of body fat was 14.6%, for male swimmers evaluated as low, 11.8%, and for female swimmers as lowered – 16.2%. Mutual relation between a fat-free body weight and fat content depends on the two groups of factors. The first group includes inherited factors and theirs role when ‘forming’ somatotype components, number of fat cells and their capacity to increase or lower their content regularly and thus also the content of body fat (Malina & Bouchard, 1991; Skibińska & Sklad, 1984). The fat content also depends on the type of sport. The lower values of body fat lower than 9% and 16% were recorded for male and female swimmers respectively. In endurance and strength-speed sports the body fat values are lower when compared to sports, in which the training is focused on kinetic abilities (Krawczyk & Sklad & Majle, 1995, p. 245). “Greater amount of fat is suitable for long-distance swimmers, where it provides lift force and creates thermal isolation against the cold” (Grasgruber & Cacek, 2008, p. 225). Carter-Ackland (1994), Carter & DeVries (1966), Counsilman (1968), Cureton & Sparling & Evans (1978), De Garay & Levine-Carter (1974), Faulkner (1967), Sprague (1976) and other studies the somatotypes of swimmers in various specialisations. The differences were determined not only between the swimming disciplines but also between the swimming distances. DeGaray et al. (1974) in the study of the Olympic swimmers did not notice any significant differences between the groups of swimmers (according to a swimming style) and body weight. “Based upon the anthropometric indicators we gain the quantitative data about the individual body segments and on the basis of morphological state of an individual, so called merfo-phenotype, we can, to some extent, predict his/her performance” (Urban & Kandráč & Lafko, 2010, p. 38). The classification of a constituent type may represent an indicator of future top-level performance. However, it is essential that the results and performance are stable within a time-frame. The studies proved that some somatotypes are stable and other vary from its original state. These changes greatly reflect the predisposition, the type of a biological maturing and influence of a kinetic activity (Grasgruber & Cacek, 2008). In our research we recorded a negative relation of ectomorph and mesomorph component at the 0.01 significance level. Malina & Bouchard (1991) support the idea of accepting the stability of ectomorph component during body growth. Mesomorph and endomorph components of young boys were not stable in time, and thus were unpredictable. During the growth acceleration phase of boys (14–16 years) we notice decrease of mesomorph, mostly endomorph and increase and growth of ectomorph. After this period, during the pubescence, the value of mesomorph increases drastically, as a result of the testosterone levels. Average mesomorph levels of an adult can be estimated at about 17 years of age (Grasgruber & Cacek, 2008, Malina & Bouchard, 1991). In our research we did not record significant relation between a swimming style and the monitored variables. According to Holmes (1977), no significant variations of somatotypes among the swimming styles and distances were determined. According to Sprague (1976) and Stroup (1964), even though in his research no significant correlations were proved and confirmed, there was a tendency to support 46 the hypothesis that there is a correlation between the swimming performance and body weight and height. Sprague (1976) came to a conclusion that the body height should provide a speed advantage when turning in front crawl, when compared to other styles. From the perspective of classification into the categories of motor performance, a category A was dominant, which according to division of Štěpnička (1977), modified by Chytráčková (1990), in: Riegrová & Přidalová & Ulbrichtová (2006), includes children with pre-condition of average or even under-average performance in speed, endurance and coordination activities. They have good constituent pre-conditions to display an absolute strength. Category D and E were each represented by 23%. The D category is a category of slim children, which have very good pre-condition for cardiovascular endurance and also coordination activities. The dominant constituent is ectomorph. The E category is generally not widely spread. The reason for its low performance probably lies in the low representation of a mesomorph constituent. In two cases the C category was formed, consisting of children with dominant endomorph constituent, awarded with 5 or more points. This case occurred in mid-distance girl swimmers, which can be connected to the fact that girl from 13 years onwards experience a rapid increase of endomorph, while mesomorph and ectomorph decreases. After the growth is stable at 16 years of age, it is possible to observe a slight increase of a mesomorph constituent (Grasgruber & Cacek, 2008; Malina & Bouchard, 1991). Conclusion There are sports in which, without a set of specific physical parameters, a toplevel performance is almost impossible, swimming being one of them. When recruiting talented youth it is recommended to pay an extra attention to the somatotype pre-conditions. If an individual has to compensate for the body-structure insufficiencies, he is at disadvantage against his opponent, since they are better physically ‘equipped’ (Moravec, 2004, p. 152). In our group was the average somatotype 3.3–3.1–4.1, classified as a mid-somatotype, for boys 2.7–3.2–4.3 and 3.6–3.0–4.0 for girls. Ectomorph was most frequent at 51.4%, and was mostly mesomorphic for both sex groups. From the found relations we considered as negative the relation of ectomorph and mesomorph component at the 0.01 significance level, which only confirms the fact that during the accelerated growth phase for boys (14–16 years) ‘slendering’ of the somatotype has been observed. Subcutaneous fat %values correlated positively with the swimming distance at the 0.01 significance level as much as the endomorph component did with the swimming distance at the 0.05 significance level. These findings confirmed outcomes of other studies (Carter &Ackland, 1994; Cureton, 1947, Cureton 1951; Grasgruber & Cacek, 2008), in which the mid and long distance swimmers were more endo-mesomorph types and had higher values of endomorph constituent. When swimming style is concerned, we did not notice any relation to any of the variables monitored. 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