Intergenerational changes in limb circumferences in children and adolescents aged 3-18 from Kraków (Poland) from 1983 to 2010

Body Image and Physical Activity and the Diet of Polish Youth Aged 15-18

Adolescence is a crucial stage in the biological, psychological, and social development of humans. During this period, perceptions of one's body and behaviors are formed. The aim of the study was to investigate body image (BI) and its relationship with physical activity and selected eating habits in adolescents. The study included 312 people (102 girls (32.69%) and 210 boys (67.31%)) aged 15-18. As many as 40% of the girls and 27% of the boys reported feeling dissatisfied with their body mass. BI was negatively perceived by the adolescents, with girls being more critical than boys. Lack of acceptance of one's body mass negatively affects overall BI in girls, and only the functional aspects in boys. Negative perception of body mass in girls does not motivate them to increase physical activity but rather causes them to adopt dietary restrictions.

Changes in adiposity and fat tissue distribution among preschool children from Kraków, Poland, from 2008 to 2018

In the light of changes in the living conditions of populations, excess adiposity is currently a serious public health problem worldwide. The aim of this study was to assess the changes in the body fat ratio among preschool children aged 3–7 years from Kraków, Poland, between 2008 and 2018. The study group consisted of children examined in two cross-sectional studies. Analysed characteristics included triceps, calf, subscapular, abdominal and suprailiac skinfold thicknesses, and adiposity calculated according to Slaughter’s equations. The trunk adiposity index and limbs-to-trunk fat ratio were also calculated. Statistical significance was obtained using two-way ANOVA and Tukey’s tests. Lower-limb adiposity was largest in the 2008 cohort and trunk adiposity was greater in the 2018 cohort. The mean values of the trunk adiposity index and limbs-to-trunk fat ratio were lower in the 2018 cohort than in the 2008 cohort. The 2018 cohort was also characterized by a lower overall adiposity. Regardless of the lower body adiposity percentage, in 2018 there was a tendency towards the central allocation of fat tissue. This is a negative phenomenon because, especially when co-existing with reduced lower-limb adiposity, it is associated with an increased risk of metabolic and cardiovascular diseases, even in young children.

Time trends in mid-upper-arm anthropometry from 1982 to 2011 in male children and adolescents from Kolkata, India

The aim of this study was to investigate inter-generational changes in selected mid-upper-arm measurements of boys from Kolkata, India. The analysis was based on the anthropometric measurements of two cohorts of Bengali boys aged 7-16 from middle-class families, in 1982-83 and 2005-11. The two cohorts were compared in terms of their mid-upper-arm circumference (MUAC) and mid-upper-arm area (MUAA), mid-upper-arm muscle area (MUAMA), mid-upper-arm fat area (MUAFA) and Arm Fat Index (AFI). The significances of the differences were determined using two-way ANOVA. All features differed significantly between the examined cohorts and all showed a general positive secular trend. In most cases, the biggest differences were noted for 14- and 16-year olds and the smallest for the youngest boys. The contemporary boys seemed to have more favourable overall developmental conditions, probably related to socioeconomic progress in India over recent decades.