Cinética de lactato em intensidade de esforço correspondente a frequência cardíaca de deflexão

Abstract

Lactate kinetics in exercise intensity corresponding to heart hate deflection point The anaerobic threshold (LAn) is a necessary predictor of aerobic capacity and it has been used as reference of intensity in the elaboration of training of long distances athletes and people interested in health benefits by exercise. This study been proposed to analyze the behavior of blood lactate during the efforts in corresponding intensity to the heart rate deflection (HRd). Nine colleges student with age between 20 and 25 years, not sedentary, had been submitted to the test of Conconi to determine the cardiac frequency of deflection and to the test of constant speed of thirty minutes (corresponding to the heart rate deflection). The results showed that in speed of race (11.1 ± 1,37Km/h) respective to heart rate deflection (189 ± 3,93bpm) the majority of the analyzed citizens obtained to complete the test of constant speed of 30 minutes. However, the behavior of lactate in this test remained steady (increase not superior to 1mmol/L from 10º to 30º minute) for all the subjects. The heart rate deflection has presented as a tool to supply intensity parameters during long duration exercises.