The aim of this research study is to summarize the notion of preference and selection, which are considered to be the key element of sports training, whatever the discipline. This review provides a theoretical study on the subject. The introduction section deals with the abovementioned terminology, whereas the main paragraph predominantly discusses the process of preference and selection in swimming. Pre-school period (6–7 years of age) is the most significant for swimming selection. Such selection should be led by adequately qualified trainers with long-standing experience in professional training of young swimmers. Young swimming candidates should be characterized by higher-level motor skills, which in turn affect the time/efficiency of acquiring new swimming techniques and sport level. In selection process, it is advised/important to utilize tests which predominantly determine the level of specific motor skills such as: speed, strength, agility, motor coordination, suppleness, and so-called ‘water feeling’. The above mentioned motor skills play an important role in sport training and sport performance. During selection process, sports team trainers should pay special attention to child’s body posture and its length parameters, specifically body’s height, length of upper and lower extremities, length of hands and feet, width parameters of the shoulders and chest. First Grade school swimming classes enrollment is also a crucial factor in identifying sport talents. The selection process should be transparent, have clear health, somatic, as well as motoric requirements, which then affect the pace and effectiveness of acquiring swimming skills and sport level.
The main reason responsible for the presence of contaminations such as heavy metals in plant products is increasing environmental pollution. As a consequence of contamination, the elements penetrate the plant and animal world as well as food and drugs. The presence of heavy metals was traced in all the investigated herbal preparations, the highest levels being found in tea bags, slightly lower – in granulated teas and gels for difficult teething. The passage of the metals to tea bags varied from 1% to 35%. Many of the investigated preparations cannot be recognized as safe as regards the levels of heavy metals, especially in relation to young children.
The first study was conducted in 1996 in 10 (i.e. all) nurseries and 11 randomly selected preschools in Szczecin. The study involved 526 children (257 boys and 269 girls) aged 1–4 years, and 865 children from preschools (448 boys and 417 girls) aged 4–7 years. In 2006, the study was repeated in seven nurseries (i.e. all nurseries that existed in Szczecin at the time) and 11 preschools in the city of Szczecin, i.e. the same as in 1996. The study involved 314 children attending nurseries: 169 boys and 145 girls aged 1.5–4 and 887 preschool children (461 boys and 426 girls) aged 4–6 years. Motor development of nursery children was assessed based on the Denver test in two selected areas. The level of motor development in preschool children was assessed on the basis of a modified Wrocław Physical Fitness Test developed by B. Sekita. Comparison of the results helped answer the question whether and what developmental changes took place over a decade. The results indicated that the level of motor development of children in Szczecin, compared with children examined 10 years earlier, showed no significant differences.
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