Resposta cronotrópica ao teste anaeróbio máximo de corrida - MART

Abstract

Introduction: Heart rate (HR) in maximal anaerobic running test (MART)expresses the cardiac autonomic behavior in exercise. It has not beeninvestigated whether such responses are associated with chronotropicaerobic and anaerobic performance. Objective: To describe the cardiacchronotropic response during the MART in seconds of stimulation (HRON)and recovery (HROFF), and establish the association between chronotropicvariables with aerobic and anaerobic performance. Methods: Thirteen malevolunteers were asymptomatic and physically active, with 25.1 +/- 4.9years, 76.8 +/- 12.5 kg, 178.4 cm and 50.6 +/- 9.0 +/- 4.1mLxkg(-1)xmin(-1). On the first visit after the interview andanthropometric measurements, we performed a cardiopulmonary exercisetesting (TCPE) with direct monitoring of expired gases. The second visitwas carried to familiarize the MART and the third, the test wasperformed until exhaustion MART. Results: Heart rate recovery (58 +/- 20bpm) compared to the peak HR achieved in the first and last stage ofMART (39 +/- 14 bpm) had a higher slope, resulting in greater range ofvariation over the test, characterizing differences (P = 0.0017). TheHRON presented between the time the initial, middle and end of the MARTsignificant differences (start versus final, p = 0.007). To HROFFsignificant differences were found starting with the middle (p = 0.035)and the starting to the final (p = 0.005) test. The chronotropiccorrelations between variables, including decrease in HR, and TCPEperformance were not statistically significant (P < 0.05), as nor as theperformance variables. Conclusion: The MART model seems to be aphysiological overload suitable for investigation of cardiac autonomicmodulation. There was action of the parasympathetic system even insupramaximal loads by the end of the test.