SOMATOTYPE AND PHYSICAL FITNESS PROFILES OF 6-12 YEAR-OLD GIRLS Selma CİVAR YAVUZ, PhD Akdeniz University School of Physical Education and Sport Departman of Coaching Education, Sports Sciences Research & Application Center, Antalya-Turkey [email protected] ABSTRACT The purpose of this study was determining the relationship between somatotype and selected physical fitness variables in 6-11 years-old girls. The subjects of this study consisted of 282 healthy girls with mean age of 08.44±01.40 years old, height of 129.88±10.48 cm and weight of 30.43±07.93 kg. Standard anthropometric methods were used to determine body mass, body height and all of skinfold and circumference measurements. All of the anthropometric measures were based on Anthropometric Standardization Reference Manual procedures. The following tests for physical performances were used; handgrip strength test, audio-visual reaction time test, vertical jump test, 20m. sprint test, sit and reach test. All statistical analyses were performed by using the Statistical Package for the Social Science (SPSS). Mean and standard deviation were calculated. Correlation coefficient was also computed to find out the relationship between somatotype and physical fitness variables. The BMI increases regularly from 6-11 years in ages groups from 17.09-19.10 2 kg/m . In this study somatotype values were changed by age groups. According to the calculations, somatotypes were found as follows: 6-7 years-old group; endomorphicmesomorph, 7-8 years-old group; endomorphic-mesomorph, 8-9 years-old group; mesomorphic-endomorph, 9-10 years-old group; mesomorphic-endomorph, 10-11 years-old group; mesomorphic-endomorph. In performance tests according to age groups, flexibility abilities decreased with age while 20m sprint, vertical jump, handgrip strength, visual and auditory reaction abilities increased. In all age groups, there was a significant low negative correlation between endomorphy, mesomorphy, ectomorphy components and physical fitness tests. Key Words: somatotype, physical fitness, girls, children [76] 1. INTRODUCTION 2. METHODS Since the 1970s, many studies investigating the relationship between the somatic characteristics and motor performance children and youth have been done. There are many somatotype studies too, which have been applied to inquiring the relationships between physical characteristics and motor performance (Bale et. al. 1994, Malina, 1975, Raudsepp and Jürimae 1996, Slaughter et. al. 1977, Slaughter et. al. 1980). Also other studies identifying the particular physical characteristics of athletes in a different sports branches and levels were observed (Gualdi Russo and Zaccagni, 2001, Monsma and Malina, 2005, Siders et. al. 1993, Tomazo-Ravnik and Kalan, 2004, Withers et. al. 1986). The assessment of human physique is often expressed in terms of somatotype, since somatotyping allows evaluation of the morphology and characteristics of the human body as a whole. Several methods are available for determining the composition of the human body. There are several methods to estimate somatotype, but the HeathCarter anthropometric method is most commonly used (Ventrella et. al. 2007, Carter et. al. 1983, Heath and Carter, 1967). Somatotyping has a relatively long tradition in human biology, including changes during growth and maturation. Since the early development of Sheldon’s somatotyping system, researchers have studied the relation of somatotype and body composition to physical performance (Raudsepp and Jürimae 1996). There are relatively few studies relating somatotype and physical fitness components, such as a strength, speed, flexibility, endurance and balance in children (Raudsepp and Jürimae 1996, Ventrella et. al. 2007, Shukla et. al., 2009, Avlonitou, 1994, Bale et. al. 1994, TomazoRavnik and Kalan, 2004). The purpose of this study is to determine somatotype and physical fitness characteristics of girls and to analyse the relationship between somatotype and physical fitness performance of 6-11 years of age girls. 2.1. Subjects The subjects of this study consisted of 282 healthy girls with mean age of 08.44±01.40 years old, height of 129.88±10.48 cm and weight of 30.43±07.93 kg. Subjects were classified into five groups according to ages. The distrubition of subjects’age was that 52 girls were between 6.00-6.99 (6-7) ages, 70 girls were between 7.00-7.99 (7-8) ages, 58 girls were between 8.00-8.99 (8-9) ages, 59 girls were between 9.00-9.99 (9-10) ages, 43 girls were between 10.0-10.99 (10-11) ages respectively. The parents of every child were informed about testing procedures and they consented to their child’s participation in this study. 2.2. Somatotype Standard anthropometric methods were used to determine body mass, body height and all of skinfold and circumference measurements. All of the anthropometric measures were based on Anthropometric Standardization Reference Manual Procedures (Lohman et. al.,1988). 2.3. Physical Fitness The following tests for physical performances were used; handgrip strength test, audio-visual reaction time test, vertical jump test, 20m. sprint test, sit and reach test. Handgrip strenght was tested by the hand dynamometer (Takei Physical Fitness Test; Grip Strength Dynamometer-T.K.K. 5101/Grip D; Made In Japan, Takei Scientific Instruments Co., Ltd.), audiovisual reaction time was tested by New Test 2000, vertical jump was tested by jumpmeter (Takei [77] Physical Fitness Test; Jump-MD, Vertical Jump MeterT.K.K. 5106/Jump MD; Made In Japan, Takei Scientific Instruments Co., Ltd.) and 20m sprint test was tested by photocell (Newtest 2000-Sprint Timing System). Posterior body flexibility was determinated by sitand-reach test. Hand dynamometer was used to assess handgrip strenght. The subjects were allowed three times with a 1 minute rest in between measurements. The highest score of handgrip strength test was used for statistical analyses.The vertical jump was used to assess explosive power of the legs. The subjects were allowed three jumps with a 1 minute rest in between jumps. The highest jump score was used for statistical analyses. The flexibility test was conducted on a sit and reach apparatus with the maximum end position being held for 2 second. Two repetitions were recorded to the nearest centimetre and separated by a rest period of 10 second (Church, 2001). 2.4. Data Analysis All statistical analyses were performed by using the Statistical Package for the Social Science (SPSS). Mean and standard deviation were calculated. Correlation coefficient was also computed to find out the relationship between somatotype and physical fitness variables. RESULTS Physical characteristics, anthropometric characteristics of girls according to the ages groups in tables 1-5. Tablo-1 displays the means and standard deviations for physical characteristics of the girls. The BMI increases regularly from 6-11 years in ages 2 groups from 17.09-19.10 kg/m . Table 1: Means and SD for age, height, weight and BMI of subjects Age(y) 6-7 age 7-8 age 8-9 age 9-10 age 10-11 age n 52 70 58 59 43 Height (cm) 118.99±05.77 123.07±05.45 130.76±05.72 136.14±06.34 144.35±07.28 Weight (kg) 24.39±04.50 26.06±04.94 30.58±05.51 33.85±07.45 39.98±07.12 2 BMI (kg/m ) 17.13±02.18 17.09±02.24 17.82±02.61 18.11±02.84 19.10±02.60 Table-2,3 displays the means and standard deviations for anthropometric characteristics of girls according to the ages groups. Table-2 displays skinfolds (triceps, subscapular, suprailiac and calf) and bone diameters (humerus and femur) measurements, table-3 displays girth measurements of girls. Table-4 displays somatotypes of subjects. Table-5 displays physical performance tests of subjects. [78] Table 2 : Means and SD for skinfold values and bone diameters of subjects. Variables Triceps (mm) Between 6-7 Ages n= 52 Mean ± S.D. 10.14±03.81 Minimum 05.20 Maximum 22.60 Between 7-8 Ages n= 70 Mean ± S.D. 11.56±04.91 Minimum 05.00 Maximum 31.00 Between 8-9 Ages n= 58 Mean ± S.D. 13.60±05.44 Minimum 06.20 Maximum 34.00 Between 9-10 Ages n= 59 Mean ± S.D. 14.32±06.35 Minimum 05.00 Maximum 35.00 Between 10-11 Ages n= 43 Mean ± S.D. 14.67±05.24 Minimum 06.20 Maximum 30.20 S.Scapular (mm) S.Iliac (mm) Calf (mm) Humerus (cm) Femur (cm) 08.13±03.10 03.00 17.00 07.45±04.28 03.20 21.60 11.28±04.80 04.00 24.00 04.63±00.35 03.90 05.50 07.25±00.52 06.10 08.50 08.44±04.44 04.00 28.00 08.40±05.05 03.00 23.00 14.38±06.74 05.00 37.00 04.83±00.54 04.00 07.70 07.39±00.59 05.10 09.50 10.20±05.94 04.00 36.00 10.23±07.45 03.40 38.00 17.47±06.31 08.00 38.00 05.14±00.74 04.20 08.40 07.63±00.73 04.80 09.00 10.35±04.36 04.00 38.00 10.49±07.03 03.00 30.40 18.04±07.78 07.00 38.20 05.19±00.48 04.30 07.50 07.93±00.73 05.00 10.00 10.68±04.85 05.00 28.00 11.23±04.98 04.00 25.00 19.77±05.36 07.00 32.00 05.48±00.39 04.80 06.30 08.26±00.64 05.30 09.30 [79] Table 3 : Means and SD for girth measurements of subjects (cm). Variables Shoulder Chest Between 6-7 Ages n= 52 Mean ± S.D. 71.59±05.09 59.14±05.91 Minimum 65.00 52.00 Maximum 87.50 83.00 Between 7-8 Ages n= 70 Mean ± S.D. 72.64±06.11 59.81±05.49 Minimum 62.50 50.00 Maximum 96.50 82.00 Between 8-9 Ages n= 58 Mean ± S.D. 77.85±06.31 63.47±06.17 Minimum 63.00 55.00 Maximum 96.00 84.00 Between 9-10 Ages n= 59 Mean ± S.D. 80.68±07.28 66.58±06.87 Minimum 69.00 56.00 Maximum 104.00 88.00 Between 10-11 Ages n= 43 Mean ± S.D. 85.77±06.77 71.56±07.41 Minimum 72.00 59.00 Maximum 103.00 92.00 Waist Hip Thigh Calf Biceps 53.66±05.38 63.49±05.75 38.26±05.25 24.06±02.43 17.66±02.12 46.00 55.00 31.00 20.00 14.00 71.00 78.00 56.00 31.00 24.00 54.62±06.61 64.40±06.71 38.32±05.43 24.12±03.17 17.98±01.64 45.00 54.91 28.00 14.00 14.00 76.00 91.00 63.00 35.00 27.00 56.57±05.91 68.76±06.06 42.01±05.40 27.93±02.81 19.61±02.88 48.00 56.00 31.00 16.00 14.00 76.00 86.00 61.50 33.00 28.00 59.28±06.78 71.82±07.28 43.68±05.57 28.97±03.78 20.20±02.68 48.00 59.00 34.00 15.00 15.00 84.00 93.00 56.00 38.00 28.00 62.14±06.35 78.25±07.49 45.63±05.16 31.09±02.64 21.82±02.90 54.00 64.00 33.00 26.00 17.00 78.00 93.00 57.00 39.00 32.00 Tablo-4 displays means and standard deviation for somatotypes of subjects. According to the calculations, somatotypes were found as follows: 6-7 years-old group; endomorphic-mesomorph, 7-8 years-old group; endomorphic-mesomorph, 8-9 years-old group; mesomorphic-endomorph, 9-10 years-old group; mesomorphic-endomorph, 10-11 years-old group; mesomorphic-endomorph. In Table 5, results of physical performance tests applied to girls aged 6-11 who participated in the study were shown. [80] Table 4 : Means and SD for somatotypes of subjects Variables Between 6-7 Ages Mean ± S.D. Minimum Maximum Between 7-8 Ages Mean ± S.D. Minimum Maximum Between 8-9 Ages Mean ± S.D. Minimum Maximum Between 9-10 Ages Mean ± S.D. Minimum Maximum Between 10-11 Ages Mean ± S.D. Minimum Maximum Endomorph n= 52 02.99±01.45 01.06 06.62 n= 70 03.38±01.86 01.25 09.71 n= 58 04.16±02.51 01.48 14.87 n= 59 04.36±02.81 01.16 14.22 n= 43 04.56±02.00 01.51 11.28 Mesomorph Ektomorph 03.89±01.02 01.72 06.29 01.59±01.22 00.83 05.38 03.76±01.23 00.76 07.97 01.96±01.16 00.94 04.45 03.91±01.35 01.97 07.33 02.19±01.42 01.63 04.66 03.75±01.23 00.78 07.02 02.45±01.43 01.19 06.06 03.71±01.47 00.59 08.16 02.47±01.35 01.60 04.81 Table 5 : Means and SD for physical performance tests of subjects. Variables 20 m. (sec.) Vertical Jump (cm) Between 6-7 Ages n=52 Mean ± S.D. 05.32±00.44 20.83±05.35 Between 7-8 Ages n=70 Mean ± S.D. 05.01±00.34 22.81±05.53 Between 8-9 Ages n= 58 Mean ± S.D. 04.81±00.31 27.36±06.83 Between 9-10 Ages n=59 Mean ± S.D. 04.71±00.39 28.38±05.25 Between 10-11 Ages n=43 Mean ± S.D. 04.61±00.39 29.93±06.10 Hand Strenght Flexibility Audio Reac. (kgm) (cm) (milisec.) Visual Reac (milisec.) 08.21±01.96 26.13±05.98 455.88±110.83 522.50±110.36 09.92±01.94 25.84±05.23 408.24±102.72 463.00±101.58 11.36±02.55 27.36±06.21 385.90±131.96 418.14± 79.80 13.50±02.56 25.80±06.31 307.83±80.56 362.12± 86.96 15.77±03.51 24.09±06.12 322.05±129.74 337.84± 68.99 [81] Table 6: Correlations between somatotype components and physical fitness characteristics of subjects at different age groups. Variables Endo. Meso. Ecto. Between 6-7 Ages n= 52 20m. Sprint 0.202 -0.039 -0.032 Vertical Jump -0.311* 0.053 -0.012 Hand Strenght 0.090 0.127 -0.048 Flexibility -0.423** -0.177 0.186 AHRT -0.188 -0.248 0.097 VHRT 0.002 0.133 -0.271 Between 7-8 Ages n= 70 20m. Sprint 0.024 -0.111 -0.062 Vertical Jump -0.118 -0.047 0.267* Hand Strenght 0.520** 0.466** -0.346** Flexibility -0.038 -0.022 -0.066 AHRT 0.936 0.977 0.580 VHRT -0.143 -0.159 -0.037 Between 8-9 Ages n= 58 20m. Sprint 0.070 0.127 -0.218 Vertical Jump 0.029 -0.004 0.000 Hand Strenght -0.030 0.047 0.098 Flexibility -0.010 0.247 -0.160 AHRT 0.067 -0.221 0.291* VHRT -0.126 -0.126 0.016 Between 9-10 Ages n= 59 20m. Sprint 0.282* 0.214 -0.170 Vertical Jump -0.322* -0.397** 0.429** Hand Strenght 0.175 0.250 -0.134 Flexibility -0.366** -0.161 0.061 AHRT 0.181 0.009 -0.040 VHRT -0.080 -0.004 -0.055 Between 10-11 Ages n= 43 20m. Sprint 0.424** 0.353* -0.278 Vertical Jump -0.395** -0.031 0.147 Hand Strenght 0.049 -0.218 -0.124 Flexibility 0.102 0.233 -0.334 AHRT -0.017 -0.061 -0.046 VHRT -0.139 -0.284 0.197 **Correlation is significant at the 0.01 level * Correlation is significant at the 0.05 level AHRT=Auditory Hand Reaction Time, VHRT= Visual Hand Reaction Time [82] Tablo 6 shows the correlation between components and physical fitness characteristics of subjects at different age groups. vertical jump (-0,004), audio (-0,221) and visual reaction tests (-0,126). Ectomorphy component had low negative correlation with 20m sprint (-0,218) and flexibility (-0,160) tests. Only correlation between ectomorphy component and audio reaction test (r=0.291, p<0.01) achieved significance. In 6-7 age group, there was a significant negative correlation between endomorphy component and vertical jump (r=-0.311, p<0.05), flexibility (r=-0.423, p<0.01) and there was a negative correlation between endomorphy and audio reaction test (r=-0.188). Endomorphy had low negative correlation (r=-0.188 to -0.423) with physical fitness tests in girls. Meanwhile mesomorphy component had low negative correlation with 20m sprint (r=0,039), flexibility (r=-0,177) and audio-reaction(r=0,248). Ectomorphy component had also low negative correlation with 20m sprint, (r=-0,032), vertical jump (r=-0,012), hand strength (r=-0,048) and visual reaction tests (r=-0,271). Ectomorph had low negative correlation (r=-0.012 to -0.271) with the majority of physical fitness tests too in girls. In 9-10 age group, there was a low negative correlation between endomorphy component and vertical jump (r=-0.322, p<0.01), flexibility (r=-0,366, p<0.05) and visual reaction tests (r=-0.080). Meanwhile, mesomorphy component had low negative correlation with vertical jump (r=-0.397, p<0.05), flexibility (-0,161) and visual (-0,004) reaction tests. There was a significant negative correlation between mesomorphy and vertical jump test. Ectomorphy component had low negative correlation with all the other tests except vertical jump (0,429) and flexibility tests (0,061). There was a significant correlation between ectomorphy and vertical jump test (p<0.01). In 7-8 age group, there was low negative correlation between endomorphy component and vertical jump (r=-0.118) and flexibility (r=-0.038), there was a low negative correlation between endomorphy component and visual reaction (r=0.143). Only correlation between endomorphy component and hand strength (r=520, p<0.01) achieved significance (r=520, p<0.01). Meanwhile mesomorphy component had negative low correlation with all the performance tests except hand strength (r=0.466) and audio reaction test (r=0.977). Ectomorphy component had low negative correlation with all performance tests except vertical jump (r=0,267) and audio reaction tests (r=0.580). Only correlation between ectomorphy component and vertical jump (r=0.267, p<0.05) and hand strength (r=-0.346, p<0.01) achieved significance. In 10-11 age group, there was a low negative correlation between endomorphy component and vertical jump (r=-0.395), audio (r=0.017) and visual reaction tests (r=-0.139). There was a significant low negative correlation between endomorphy and vertical jump test (r=-0.395, p<0.05) and a significant positive correlation between endomorphy and 20m. sprint test (p<0.01). Meanwhile mesomorphy component had low negative correlation with all the other tests except 20m sprint (r=0.353) and flexibility (r=0.233). There was a significant positive correlation between mesomorpy component and 20m. sprint test (r=0.353, p<0.05). Ectomorphy component had low negative correlation wiht all the other tests except vertical jump (r=0.147) and visual reaction (r=0.197). Ectomorphy component had low negative correlations (r=-0.046 to -0.334) with majority of physical fitness tests in 10-11 aged girls. In 8-9 age group there was a low negative correlation between endomorphy component and hand strength (-0,030), flexibility (-0,010) and visual reaction tests (-0,126). Meanwhile mesomorphy component had a low negative correlation with [83] DISCUSSION When the same children were followed longitudinally they were categorized as either mesomorph-ectomorph, mesomorphıc-ectomorph or balanced ectomorph (Monyeki et. al. 2002). They are different from 10-years old Nigerian girls, who were more endomorphic. The mean somatotype of Ellisras rural girls differs from the Belgian girls who showed an increased dominance in both endomorphy and ectomorphy and decrease in mesomorphy (Hebbelinck 1995). Physical fitness tests have been used as criterion measures in studying the relationships between somatotype and performance. Test of strength, endurance and speed are more highly related to somatotype than tests of flexibility, balance, eye-hand coordination or speed of limb movement, especially at the extremes of physical performance (Raudsepp and Jürimae 1996, Beunen et. al. 1985, Carter 1990). In this study; in performance tests according to age groups, flexibility abilities decreased with age while 20m sprint, vertical jump, hand strength, visual and audio reaction abilities increased (Table-5). In 67 age groups, endomorphy, mesomorphy and ectomorphy components had low negative correlation (r=-0.012 to -0.423) with majority physical fitness tests in girls. There was a significant negative correlation between only endomorphy and vertical jump (r=-0.311, p<0.05) and flexibility tests (r=-0.423, p<0.01). Endomorphy, mesomorphy and ectomorphy components had low negative correlation (r=-0.022 to -0.159) with majority physical fitness tests in 7-8 age groups too. But there was a significant correlation between only hand strenght and endomorphy (r=0.520, p<0.01), mesomorphy (r=0.466, p<0.01) and ectomorphy (r=0.346, p<0.01). There was a significant correlation between ectomorphy and vertical jump test (r=0.267, p<0.05). Endomorphy, mesomorphy and ectomorphy components had low and negative correlation (r=-0.004 to -0.218) with majority physical fitness tests in 8-9 age groups too. But there was a significant correlation between only audio reaction test and ectomorphy (r=0.291, p<0.05). In 910 age groups, endomorpy, mesomorphy and ectomorphy components had low negative correlation (r=-0.004 to -0.397) with majority physical fitness tests. There was a significant between endomorphy and 20m. sprint (r=0.282, p<0.05), vertical jump (r=-0.322, p<0.05), flexibility tests (r=-0.366, p<0.01); mesomorphy and vertical jump test (r=-0.397, p<0.01); ectomorphy and In this study, descriptive statistics by age are summarized in table 1. The BMI increases regularly from 6-11 years in ages groups from 17.09-19.10 2 kg/m . According to anthropometric measurements; skinfold, bone diameters and girths measurements increases regularly from 6-11 years in ages groups (Table 2,3). In this study somatotype values were changed by age groups. Mesomorphy component was dominant in age groups between 6-7 years and 7-8 years. Endomorphy component was dominant in age groups between 8-9, 9-10 years and 10-11 years. Carter provided a model of general pathway of children’s somatotypes from infancy to adulthood (Carter 1990). Toriola and Igbokwe founded in their study, that there were different from 10-years old Nigerian girls (Toriola and Igbokwe 1985), who were more endomorphic. In our study 8-9, 9-10 and 10-11-years old girls were endomorph. According to the age groups, somatotypes were found as follows: 6-7 years-old group; endomorphic-mesomorph, 7-8 years-old group; endomorphic-mesomorph, 8-9 years-old group; mesomorphic-endomorph, 10-11 years-old group; mesomorphic-endomorph. Girls in the present sample showed a similar pattern as reported cross-sectionally by Monyeki et. al. (2002), in that throughout the age groups, pre-school girls tend to be dominant in mesomorphy and ectomorphy but less preponderant in endomorphy. [84] vertical jump test (r=0.429, p<0.01). In 10-11 age groups, endomorphy, mesomorphy and ectomorphy components had low negative correlation (r=-0.017 to -0.395) with majority physical fitness tests. There was a significant between endomorphy and 20m. sprint (r=0.424, p<0.01) and vertical jump (r=-0.395, p<0.01) tests. There was a significant between mesomorphy and 20m. sprint test (r=0.353, p<0.05). According to the calculations in this study, somatotypes were found as follows: 6-7 years-old group; endomorphic-mesomorph, 7-8 years-old group; endomorphic-mesomorph, 8-9 years-old group; mesomorphic-endomorph, 9-10 years-old group; mesomorphic-endomorph, 10-11 years-old group; mesomorphic-endomorph. The results of the study show that, there are some significant correlations between somatotype and some of the physical fitness tests. In each age group different findings were observed according to these relations. Endomorphy showed significant relations with some of the tests in age goups 6-7, 78, 9-10 and 10-11, mesoporhy had significant relations with some of the physical fitness tests in age groups 7-8, 9-10, 10-11, while ectomorphy had significant correlations in age groups in age groups 78, 8-9, 9-10. The results of the present and previous studies clearly indicate that somatotypes as the reflection of children’s physique is a acceptable predictor to explain differences in physical fitness of children. Several environmental factors such as physical activity, influence of parents, teachers etc. must also be considered in attempting to explain differences in physical fitness of children. CONCLUSION In this study somatotype values were changed by age groups. Mesomorphy component was dominant in age groups between 6-7 years and 7-8 years. Endomorphy component was dominant in age groups between 8-9, 9-10 years and 10-11 years. 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