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The objective of this study was to compare the corporal composition and the explosive strength capacity of lower limbs in primary school students from two different schools in the locality of Martos (Jaen). One of these schools was located in a marginalized neighbourhood where families of low socioeconomic status lived and the other was near the town centre with families of medium to high socioeconomic status. The aim was to evaluate these variables at two different moments in time, i.e., at the beginning and at the end of the school year, to see if the obtained results remained the same. A total of 147 primary school students (6–12 years old) participated in the study, divided into 4 subgroups, according to sex and school. Body composition and explosive strength capacity of the lower limbs were evaluated using the vertical jump test. For independent samples, T tests were performed to obtain the existing differences through the SPSS v 19.0 programme. It was found that according to the first measurement at the beginning of the year, participants from a medium-high socioeconomic background obtained better results, while the second measurement showed that results equalized and even reversed. This could have been due to the level of performed physical activity.

Explosive Strength Capacity in the Lower Limbs of Primary Education School Children According to Environment