Heart Rate Behavior and its variability in Crossfit® practitioners

Objetivo: Analisar os comportamentos da pressão arterial, frequência cardíaca (FC) e da sua variabilidade (VFC) em praticantes de CrossFit®.Metodologia: Medidas antropométricas, capacidade aeróbica, pressão arterial, FC e VFC foram realizadas ao início e ao final de 12 semanas de treino. A capacidade aeróbica foi mensurada a partir de teste progressivo em cicloergômetro e a VFC através de registros em frequencímetro da marca Polar. As comparações estatísticas foram feitas através do teste T de student.Resultados: Somente uma das variáveis propostas para análise antropométrica apresentou diferença significativa, que foi o aumento de massa muscular. SD1 e SD2 não apresentaram diferença significativa, porem houve um aumento. A pressão apresentou-se estável.Conclusão: Os comportamentos da frequência cardíaca e de sua variabilidade com o treinamento de CrossFit®, apresentaram evidências de modificações autonômicas no controle da frequência cardíaca. Sugere-se alterações benéficas da função autonômica cardíaca com o aumento da variabilidade cardíaca.Objective: To analyze the behavior of blood pressure (BP), heart rate (HR) and its variability (HRV) in CrossFit® practitioners.Material and Methods: The CrossFit® method was applied to 10 individuals of both sexes, three times a week, for twelve weeks. The outcome variables were anthropometric measures, aerobic capacity, BP, HR and HRV at rest and after twelve weeks of training. The aerobic capacity was measured from a progressive test in a cycle ergometer and the HRV through records in a Polar brand frequency meter. Statistical comparisons were made using the Student t test. Results: Only the variable lean mass (kg) showed a statistically significant difference (p=0.058). The registry variables of the HRV (SD1 and SD2) did not present a significant difference, however, they had a small increase. BP remained stable and unchanged before and after training.Conclusion: The beneficial influence of CrossFit® training on subjects’ body composition and HRV values suggests that this type of training plays an important role in maintaining the health of normal individuals, as well as in cardiac parasympathetic modulation

ANTHROPOMETRIC CHARACTERISTICS AND LOW MEMBER POWER IN UNIVERSITY PLAYERS OF RUGBY-7

The objective of this study was to compare the anthropometric and lower limb power (PMI) variables in a sample of rugby-7 players holding different positions. Twenty-two rugby-7 college players participated; according to the positions occupied on the playing field, they were classified in back and forward. The protocol of seven skin folds of Jackson & Pollock was used to evaluate the percentage of fat; and for the PMI tests vertical jump (CMJ), horizontal jump and triple jump. The T-test for paired samples was adopted, being p < 0.05, to compare the study variables. The results indicated a significant difference between the total mass (p < 0,01), the fat-free mass (p < 0,05), the fat mass (p < 0,01), and the CMJ (p < 0,005) between the groups. It is observed that the anthropometric demands for the forwards are different from the backs, due to the characteristic of the game position, which requires a different physical and morphological configuration