Performance of brazilian university handball players in the vertical jump after maximum strength training

This study aimed to analyze the performance of the vertical jump with counter movement (CMJ), in university handball athletes, immediately after the maximum strength training in multiple series and after 10 and 15min of rest. Twelve male athletes participated, age 20.9±2.4 years old, height 1.78±0.05m and Body Mass Index (BMI) 28.74±8.1kg/m2. After the tests and retests of 1 repetition maximum (1RM) for the dominant and non-dominant sides, in the leg extension, the volunteers performed crossover after 48 hours of the training sessions. CMJ measurements were collected before and immediately after each training protocol and after 10 and 15min of rest. Passive recovery between sets was three minutes. The intervals between training protocols were at least 45min. There were no statistical differences for the CMJ between the moments pre-, post-training session, 10 and 15min of rest in the different protocols, but progressive increases in the CMJ variables were observed, extending up to the 15th minute of rest, in all training protocols when comparing the results of the means of the CMJ variables of the moments post-training session, 10 and 15min of rest with the averages of the variables from the pre-training session, being more evident in the alternate unilateral protocol, which, unlike the other protocols of the study, performed series with the two lower limbs. It was evidenced that the training protocols of short duration and with high dynamic efforts, previously performed, influenced the performance of the CMJ, favoring for the transient improvement of the explosive muscular strength of the athletes.

Acute effect of intra-set static stretching on antagonists versus passive interval on the performance of maximum repetitions of agonists in leg extension machine / Efeito agudo do alongamento estático intra-séries nos antagonistas versus intervalo passivo sobre o desempenho de repetições máximas dos agonistas na cadeira extensora

Abstract Adolescent idiopathic scoliosis (AIS) is a three-dimensional deformity of the spine that generates changes in the biomechanics of the rib cage. Digital photogrammetry enables the recording of subtle changes and the interrelationship between parts of the human body that are difficult to measure by other means. The aim of this study was to create angles and thoracic distances and to evaluate the interobserver and intraobserver reliability of these measurements using the Software de Avaliação Postural (SAPO) in patients with AIS. This cross-sectional study evaluated 30 individuals aged between 11 and 18 years with AIS. We used SAPO with the thoracic markers in the form of angles (A) and distances (D) with involves structures like acromion, manubrium, xiphoid process, lower angle of the scapula, last false rib, anterior iliac spine process. Two experienced observers (A and B) analyzed the photos and all followed the same routine of analysis. Intraobserver and interobserver reproducibility was assessed by the Bland-Altman plot and intraclass correlation coefficient (ICC), while intraobserver and interobserver reliability was assessed by the T-Test and Wilcoxon's Test. A high repeatability index was obtained among the evaluations, with twelve of the sixteen variables considered as reliable in all statistical tests. The interobserver analyzes presented excellent correlation coefficients (ICC), showing good reliability for six of the sixteen variables proposed. The SAPO method presented good reproducibility and reliability for most of the thoracic markers created, showing that photogrammetry may be a complementary tool in the evaluation of thoracic alterations in patients with AIS.

Resumo A escoliose idiopática do adolescente (EIA) é uma deformidade tridimensional da coluna que gera alterações na biomecânica da caixa torácica. A fotogrametria digital permite o registro de mudanças sutis e a inter-relação entre partes do corpo humano que são difíceis de medir por outros meios. Objetivou-se criar ângulos e distâncias torácicas e avaliar a confiabilidade interobservador e intraobservador dessas medidas utilizando o Software de Avaliação Postural (SAPO) em pacientes com EIA. Este estudo transversal avaliou 30 indivíduos com idades entre 11 e 18 anos com EIA. Utilizamos o SAPO com os marcadores torácicos na forma de ângulos (A) e distâncias (D), envolvendo estruturas como: acrômio, manúbrio, processo xifóide, ângulo inferior da escápula, última costela falsa, processo da espinha ilíaca anterior. Dois observadores experientes (A e B) analisaram as fotos e todos seguiram a mesma rotina de análise. A reprodutibilidade intraobservador e interobservador foi avaliada pelo gráfico de Bland-Altman e coeficiente de correlação intraclasse (CCI), enquanto a confiabilidade intraobservador e interobservador foi avaliada pelo Teste T e Teste de Wilcoxon. Um alto índice de repetibilidade foi obtido entre as avaliações, com doze das dezesseis variáveis ​​consideradas confiáveis ​​em todos os testes estatísticos. As análises interobservadores apresentaram excelentes coeficientes de correlação (ICC), mostrando boa confiabilidade para seis das dezesseis variáveis ​​propostas. O método SAPO apresentou boa reprodutibilidade e confiabilidade para a maioria dos marcadores torácicos criados, mostrando que a fotogrametria pode ser uma ferramenta complementar na avaliação de alterações torácicas em pacientes com EIA.