Heart rate and the identification of metabolic transition points in treadmill exercises

Abstract

The objective of this study was to determine the heart frequency conduct in a treadmill maximum progressive test. Twenty college students were submitted to a maximum progressive test, with initial speed of 5 km.h^-1 and increments of 0,3 km.h^-1 each minute. The identification of the heart frequency transition points (HRTP) was done through mathematical models. The HRTP were observed in all subjects, with identification of the heart frequency inflection point in the initial (n=3) and final (n=6) periods of the curve, while the heart frequency deflection point was founded in all subjects, with identifications in the beginning (n=6), in the end (n=3), and isolated (n=11) in the curve. In agreement with recent literature, from the results obtained, a curvilinear behavior of heart frequency related to work intensity was found, allowing the observation of HRDP in initial and final periods of the curve, remaining a necessity of the verification of physiological meanings of these points.