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Generation changes over the period of 1986-2006 in the physical fitness of boys aged 7-19 from eastern Poland at particular stages of education

100%
Saczuk J., Wasiluk A., Zalech M.
Biomedical Human Kinetics
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2012
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vol. 4
112-116
EN
Study aim: To assess the size of secular trends in the physical fitness of boys from eastern Poland taking into consideration stages of education. Material and methods: The physical fitness results of boys aged 7-19 years living in eastern regions of Poland were analyzed: 3188 students were examined in 1986 while in 2006 the research included 10 810 boys. In both examinations (1986 and 2006), the level of motor abilities was measured according to the guidelines of the International Physical Fitness Test. The individual results of children and youth examined in 2006, which took into account calendar age, were converted into points on a T scale, with means and standard deviations from 1986 accepted as norms. On the basis of the obtained point values and taking into account stages of education (7-9 – integrated teaching, 10-12 – primary school, 13-15 – lower-secondary school, 16-18 – upper-secondary school), arithmetic means and dispersion values concerning motor abilities in the groups were calculated. Individual results in motor abilities of every subject were used to define quantitative generation changes. Differences between the means obtained in 1986 and 2006, as well as between the fractions of boys qualified for respective fitness category in both examinations, were assessed. Results: Over the 2-decade period the boys from eastern Poland slightly improved their results only as far as sit-ups are concerned (1.47 points), while the level of bent arm hang, handgrip, 50 m run, and shuttle run 4×10 m remained the same. In contrast, negative changes were observed in the long run (4.44 points), the sit-and-reach test (4.47 points), and the standing broad jump (3.74 points). The greatest decline in motor abilities was noted amongst schoolchildren from integrated education classes (2.69 points); whereas the smallest decline was noted in adolescents from lower secondary schools (0.60 points). Conclusions: The changes noted in physical fitness indicate that in the context of health the revision of the Act on Physical Culture from 2002, which reduced the number of school’s physical education classes, is a debatable issue.
2
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Body image of adolescent boys

100%
Turski J., Głogowska J., Wilczkiewicz M., Stupnicki R.
Biomedical Human Kinetics
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2012
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vol. 4
117-120
EN
Study aim: To compare the perception of own body by adolescent boys with an external assessment. Material and methods: Two groups of boys (45 from Warsaw, aged 15 – 16 years, and 49 from a small town in South- Eastern Poland, aged 16 years) were studied by using standard body image templates containing 9 shapes. Every boy indicated the perceived shape and that he wished to have. The external assessment was done by the same investigator and that assessment served to classify boys as underweight (n = 4), normal (n = 51) or overweight (n = 39; Shapes 1 – 2, 3 – 4 and 5 – 9, respectively) and to correlate the scores with BMI. Results: The external and self-assessments were concordant in overweight boys, the desired shapes being significantly lower only in Group 1. The percentage of overweight boys was significantly (p<0.05) higher in Group 1 than in Group 2. “Normal” boys from Group 1 significantly (p<0.001) overrated their body shape compared with external rating. External ratings of body shape significantly correlated with BMI values in both groups alike (r = 0.82, p<0.001). Conclusions: The presented approach to body shape studies may contribute to preventing biosocial disorders in adolescent boys brought about by thoughtless striving for an ideal shape promoted by mass media.
3
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Effects of 8-week training on aerobic capacity and swimming performance of boys aged 12 years

88%
Zarzeczny R., Kuberski M., Deska A., Zarzeczna D., Rydz K., Lewandowska A., Bałchanowski T., Bosiacki J.
Biomedical Human Kinetics
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2011
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vol. 3
49-52
EN
Study aim: To assess the effects of 8-week endurance training in swimming on work capacity of boys aged 12 years.Material and methods: The following groups of schoolboys aged 12 years were studied: untrained control (UC; n = 14) and those training swimming for two years. The latter ones were subjected to 8-week training in classical style (CS; n = 10) or free style (FS; n = 13). In all boys maximal oxygen uptake (O2max) was determined, and the CS and FS groups were subjected to 6 tests: swimming at 50 and 400 m distances (time recorded) and to 12-min swimming (distance recorded), all by free and classical styles pre- and post-training. From swimming times at 50 and 400 m distances the so-called critical swimming speed (CSS) was computed: CSS = (400 - 50) / (t400 - t50).Results: No training-induced improvement in O2max was noted in any group. Yet, boys subjected to classical style training significantly (p<0.05) improved their free-style swimming velocity at CSS and at the 400-m distance by about 6%, and their heart rate following the 12-min test in classical style decreased by nearly 16% (p<0.001) compared with the pre-training values.Conclusions: The 8-week training in given swimming style does not negatively affect the performance in other style than the trained one. This may be of importance in competitive training.
4
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The changes in running economy during puberty in overweight and normal weight boys

75%
Maciejczyk M., Gradek J., Szymura J., Cempla J., Więcek M., Tota Ł.
Biomedical Human Kinetics
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2015
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vol. 7
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issue 1
EN
Study aim: running economy (RE) is important indicator of endurance performance. During puberty dynamic changes in body composition and function are observed, as such RE is also expected to change. The aim of the study was to compare the running economy (RE) in overweight and normoweight boys during a running exercise performed with constant velocity, and the assessment of changes in RE during puberty. Material and methods: the RE of the subjects was evaluated twice: at the age of 11–12 and two years later. 18 overweight and 17 normal weight boys performed a graded test and a week later a submaximal run on a mechanical treadmill. During the exercise, physiological variables (oxygen uptake, heart rate, pulmonary ventilation, tidal volume and breathing frequency) were measured. Results: the intensity of work in both tests (%VO2max, %HRmax) was significantly higher in the overweight boys and decreased with age (non significantly) in both groups. The physiological response during the run in the overweight boys was significantly higher compared to normal weight. When the oxygen uptake was expressed as VO2.BM–0.75, the RE was similar in normal weight and overweight boys. During puberty, the inter-group differences in the metabolic cost of work stay at a relatively stable level. Conclusions: the lowered endurance performance in the overweight boys during puberty remains unchanged. The changes in physiological variables during puberty in both groups occurred in a similar way – the body composition did not influence the course of these changes in puberty.
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