Influência circadiana no comportamento de variáveis fisiológicas e físicas utilizadas para o diagnóstico do desempenho físico

Abstract

In the context of the evaluation and diagnosis of the physical performance, the knowledge deriving from the Cronobiologia, becomes important, because these knowledge allow to understand each other and to consider the variations that are happening to all the moment in our organism. Considering that the physical evaluation in Laboratories of Physiology of the Exercise, today, is a reality in several areas of the Country and it bases on the answer certain variables to the physical stress caused by the exercise, it is ignored to what extent the non observance of the shift of the evaluation, it can have effect on the diagnosis of the physical performance accomplished in these laboratories. Thus, it was looked for to investigate the circadian influence on the behavior of specifics physiologic and physics variables in progressive test of maximum effort used for the diagnosis of the physical performance in young adults. Six individuals were investigated (03 men and 03 women), volunteers, physically actives, healthy with the following characteristics: percentile of fat of 16,61±7,70%, stature of 169,85±10,45 cm, corporal mass of 60,29±11,30 kg and 22,50±2,65 year-old age. The individuals attended in two different days (with interval of seven days) in the Laboratory, and in one of the days the variables was accomplished the 9:00 and in the another it was accomplished the 16:00. The analyses were accomplished in rest and during the exhaustive progressive test with the following variables: consumption of oxygen, production of CO2, ventilation, respiratory quotient, heart frequency, seric lactato, maximum speed of race and total time of test. The obtained results, they didn't present difference among the different periods of the day (9:00 and 16:00), when using the test of Wilcoxon, considering as significant a p < 0,005. Thus, considering the used protocol and the assessed group, the diagnosis of the physical performance, tends as base the behavior of specifics physiologic and physics variables in progressive test of maximum effort, it doesn't suffer influence circadiana, suggesting that there is not obligatory to realize the second assessment of the physical performance in the same shift of the day of that accomplished previously.