Influence of body build on hand grip strength, simple reaction time and strength of the abdominal muscles in prepubertal children.

The aim of the study was to assess whether the body build has an impact on hand grip strength, muscle endurance and time reaction in children. The material of the research were 376 children from 6.78 to 11.

Socio-economic determinants of the somatic development and reaction time of vegetarian and non-vegetarian children.

Vegetarian diet is increasingly used in both adults and children. The aim of the study was to determine the differences in the body build and reaction time of vegetarian and non-vegetarian children on the background of socio-economic factors. The material consisted of 218 children, including 47 vegetarians (25 boys and 22 girls) and 171 non-vegetarians (93 boys and 78 girls) from 3 to 15 years.

Body structure, muscular strength and living conditions of primary school children in Warsaw.

The aim of this study was to determine whether the living conditions of school children affects their body structure and muscular strength. Data were taken from 400 girls and 341 boys aged 7-15 years attending nine primary schools in Warsaw in 1997. A questionnaire was completed, anthropological measurements made and two muscular strength tests conducted.

Age at maturation, body structure and their relationship with socioeconomic factors.

In this study, we aimed to identify the differences in body structure between early, average, and late maturing girls, taking into account family characteristics assessing socio-economic and living conditions. This study was conducted in the years 2003 and 2013 in Warsaw, Poland and comprised 788 girls in the age group of 11-19 years. The data were collected using a questionnaire which included parental education and profession, girls' date of birth, age at menarche, and lifestyle characteristics.

Meeting Report: Growth and Social Environment. Proceedings of the 25th Aschauer Soiree, held at Krobielowice, Poland, November 18th 2017.

Twenty-two scientists met at Krobielowice, Poland, to discuss the impact of the social environment, spatial proximity, migration, poverty, but also psychological factors such as body perception and satisfaction, and social stressors such as elite sports, and teenage pregnancies, on child and adolescent growth. The data analysis included linear mixed effects models with different random effects, Monte Carlo analyses, and network simulations. The work stressed the importance of the peer group, but also included historic material, some considerations about body proportions, and growth in chronic liver, and congenital heart disease.

Variation in indicators of respiratory functions among Warsaw adolescents in relation to ambient air pollution and smoking.

This work presents results of studies on secondary school adolescents inhabiting two regions of Warsaw: Sródmiescie district (Downtown) and Miedzylesie (Wawer district - Vicinity), conducted in 2006. These two districts significantly differ according to air pollution, which is much higher in Downtown than in Vicinity. The sample consists of 219 boys and 225 girls aged 13-16 years.

Does a seasonal developmental rhythm exist in tropical living populations?

The main aim of this work concerns the answer a question whether the general regularity of seasonal differences in changes of height, weight and body components during ontogeny exist. If so, whether this phenomenon depends on cyclic changes in nature or this rather is an adjustment to local conditions and mode of life. To answer this question the studies took place in the tropical climate of Yucatan and included 49 boys and 47 girls aged 11-12 years and being of the Maya, Mestizo and Creole origin.