Efeito de uma competição de crossfit® na variabilidade da frequência cardíaca e potência muscular: um estudo de caso com praticantes

Abstract

The objective of the study was to evaluate the effect of a CrossFit competition in the variability of heart rate and muscular potency of practitioners. The sample was composed of 3 subjects sending one male (subject to: 30 years; 93 kg; 188 cm; 17 months of experience) and two female (subject B: 21 years; 68 kg; 169 cm; 7 months experience; Subject C: 28 years; 59 kg; 164 cm; 17 months of experience). were monitored during a competition lasting for days. The internal load of competition was made one from the variability of the heart rate, along with as psychometric variables and subjective perception of the effort, already for evaluation of the muscular potency the subjects were subjected to the test of jumping with Countermovement. Descriptive statistics (average and 8 standard deviation) and the percentage variation (Δ%) were used to observe how possible differences between pre and post times for competition days. The values obtained show that the 1st day Juliette Greater impact on VFC and SCM for subject A, deserve not to send perceived by subjects B and C. Already for the 2nd day, as reductions of VFC out of 5, 4% (A) and 3 , 9% (B), with different response to subject C, already for SCM all presented increases. In conclusion, two days of CrossFit competition promoted negative changes to VFC in the subject to decreased muscle power of subjects A and C. Further investigations are necessary to determine greater consequences arising from the participation of practitioners in competitions. Although we have not observed the same condition for all individuals considering the days, it was notable the decrease on the variability of heart rate and muscular potency.