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The present study was designed to determine if BIA and skinfolds could track changes in body composition like DEXA. Fifty male volunteers participated in a 12-week high-intensity resistance-training program. Body composition was assessed using DEXA, skinfolds (SF), and BIA. Results indicate when DEXA was used as the criterion measure; BIA and SF may not be appropriate assessment techniques. BIA and SF significantly overestimated percent fat and fat-weight pre- and post-treatment (p<0.05). Although SF and BIA exhibited acceptable r-values, significant differences were observed between DEXA and BIA and SF (p < 0.0001). These results indicate that DEXA’s ability to track changes in body composition may be more appropriate compared to BIA and SF during and following a resistance-training program. Future studies using hydrostatic weighing are needed to determine if differences observed are the results of DEXA’s accuracy in tracking fat free-weight or the inability of BIA and skinfolds to track changes.

This study's purpose was to determine the validity of near-infrared interactance (NIR) and bioelectric impedance (BIA) in tracking changes in body composition over 12 wk of either a high intensity endurance (ET) or resistance (RT) training program in nondieting weight-stable untrained males. Prior to and following the control or training period, each subject completed a series of body composition analyses including hydrostatic weighing (HW) with a measurement of residual volume; anthropometric measurements including height, weight, skinfold, and girth; BIA measurement; and NIR measurements. Based on the HW results, there were no significant body composition changes in the control group. For the ET group, a significant decline in relative body fat resulted from a reduction in fat weight (FW) with no change in fat-free weight (FFW). In the RT group, both a significant decline in FW and an increase in FFW contributed to this group's decline in relative body fat. Tracking changes in relative body fat, FW, and FFW, skinfolds agreed reasonably well with HW in all groups while BIA and NIR did not always track body composition changes well. For example, SF and BIA were significantly correlated with the changes in FFW (HW = + 4.1%, SF = + 4.5%, BIA = + 3.1% NIR = - 0.7%) observed in the RT group compared to HW (SF: r-value = 0.45, SEE = 2.5; BIA; r = 0.33, SEE = 3.4) while the NIR measurements were nonsignificant (r = 0.09, SEE = 5.0). Interestingly, NIR underestimated the gain in FFW in the resistance trained group while BIA underestimated the changes in relative body fat, FW, and FFW in the endurance trained group. Based on these results, BIA aim NIR appear not to be appropriate measurement tools for tracking body composition changes in endurance and resistance training individuals respectively.

184 second grade girls from different primary schools were measured. Current body height, body weight, mid-arm circumference, body mass index and the skinfold thickness were established. All the body characteristics were statistically processed and they were analysed. The results are in a good agreement with current czech standards (V. and VI. Nation-wide Anthropological Survey of Children and Adolescents in the Czech Republic 1991, 2001), or in case of skinfold thickness (Bláha et al, 1999 a ). The results could be influenced by the optional permition of girls

Title: Comparison of somatotype profiles in ice hockey players of national team 1976 and national team U19 season 2017-2018. Objectives: The main aim of this thesis is to compare the level of somatotype profile changes between national team of Czechoslovakia from 1976 and Czech republic national team U19 playing in season 2017-2018. Methods: For purpose of study the observation research method was used. Research samples were made of 41 ice hockey players, specifically players of Czechoslovak national team from 1976 (n=24) and players of Czech national team U19 in season 2017-2018 (n=17). The somatotype was determined using Heath and Carter method (1990). To determine the degree of differences between the given parameters, the effect size of Cohen d was used, d ≥ 0,5 a d ≥ 0,8 depending on the hypothesis formulated. Results: Results showed, that the endomorphy of U19 players was significantly greater compared to ČSSR 1976 players (Cohen d = 0,65). The biggest difference was revealed at supraspinale skinfold (Cohen d = 1,06). On the other hand, we found significantly lower mesomporhy in U19 players (Cohen d = 1,63). The cause of this lower mesomoprhy was mainly due to significantly lower bone robusticity of the humerus (Cohen d = 0,81) and femur (Cohen d = 1,19). Keywords: somatotype, ice hockey,...

Thesis is focused on the analysis of intersexual differences in adiposity markers within urban population of Czech children from 11,00 to 15,99 years. This age range encompasses puberty which is one of the critical periods for the possible development of overweight and obesity. The sample PRAHA 2013 consists of 356 girls and 353 boys which were surveyed for basic anthropometric indicators - body height, body weight, BMI, mid- upper arm circumference and the thickness of four skinfolds. Intersexual differences discovered in measured parameters show statistical significance (p<0,01 resp. p<0,001) and it corresponds with the characteristic changes of pubertal development in both of genders. Testing file PRAHA 2013 against reference standards and its comparison with the results of the last Czechoslovak spartakiade in 1985 points to positive secular trend of increasing body height. However increase in weight parametres is still continuing. Probands from the year 2013 reach higher body weight values, BMI and skinfold thickness in comparison with children of the same age in 1985, 1991 resp. 2001. Significant differences were found out in the most of age categories in both of genders. Keywords: adiposity tissue, subcutaneous fat, skinfolds, body fat distribution, sexual dimorphism, obesity, secular trend