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[Relationship between body adiposity and horizontal jump in school children and adolescents].

A high level of physical fitness in childhood and adolescence is associated with more favorable phy sical and mental health outcomes.


OBJECTIVE
To compare body adiposity and horizontal jump per formance with international studies and to analyze the relationship between body adiposity and ho rizontal jump performance indicators in children and adolescents.


PATIENTS AND METHOD
Descriptive study conducted on 812 adolescents from Talca (Chile), with an age range between 10.0 and 16.9 years. Weight, height, waist circumference (WC) and Horizontal jump (HJ) were evaluated after warm-up for 10 to 15 minutes to evaluate the explosive strength of the lower extremities according to the protocol of Castro-Piñero et al. Adiposity and HJ were compared with national and international studies. The data normality was verified by the Kolmogorov-Smirnov test. Smoothed percentile cur ves (p50) were created for BMI, WC, and HJ for each gender according to the LMS method.


RESULTS
Adolescents showed differences in body adiposity and HJ performance with international studies. In both genders, negative and significant correlations were found between the BMI and the HJ (men r = -0.104 and women r = -0.149) and between the WC and the HJ (men r = -0.100 and women r = -0.131). The adolescents who were classified in tertile 1 (good) and tertile 2 (satisfactory) had lower body adiposity (BMI and WC) and better HJ performance than those in tertile 3 (poor).


CONCLUSION
Higher body adiposity and lower HJ performance were observed compared to international studies. In addition, a negative relationship between body adiposity and HJ was found. These findings suggest that the progressive increase of adiposity as age increases negatively affects the strength performance of the lower extremities of the studied children and adolescents.