Resposta do transiente final da frequência cardíaca ao teste anaeróbio máximo de Corrida - MART

Abstract

The initial and final transient heart rate may have different responses to maximal anaerobic running test with different inclinations. Even more so when compared groups with a high level of fitness, but in different sports. Objectives: (a) Describe the chronotropic response of the heart during maximal anaerobic running test. (b) Compare soccer players and recreational runners to heart rate variability at rest pre and post the maximum anaerobic running test influenced by the treadmill incline. Methods: In the first study evaluated 13 volunteers physically active with 25,1 ± 4,9 years, 76,8 ± 12,5 kg, 178,4 ± 9,0 cm e 50,6 ± 4,1 mLkg 1min 1 in three visits. The heart rate measurements were analysed every 5 s observing the heart chronotropism in three stages of MART (beginning, middle and end). In the second study we evaluated 20 volunteers (12 soccer players and 8 recreational runners) in three experimental visits. Results: In the first study, heart rate recovery was recorded after 60 s of stimulation (58 ± 20 bpm) compared to peak heart rate achieved in the 20 s of stimulation (39 ± 14 bpm) the maximum anaerobic test racing in the first and last stage the maximum anaerobic test run showing higher range of variation at the extremes of the maximum anaerobic test run the recovery heart rate when compared to peak heart rate (P = 0.0017). A greater range of variation in seconds of stimulation when compared to the initial end of the maximum anaerobic running test (p = 0.007) was found. It was found a gradual increase in amplitude in the initial recovery times as compared with the middle (p = 0.035) and compared with the final (p = 0.005) test. In the second study athletes and non-athletes had similar levels of aerobic fitness (56.04 ± 5.34 vs. 56.05 ± 4.44 mL.kg-1 .min -1, P = 0.600) and anaerobic (113, 87 ± vs. 109.89 ± 10.00 8.36 mL.kg-1.min-1, P = 0.649). The cardiac autonomic modulation in pre maximum anaerobic test race compared after maximal anaerobic running test rest showed significant difference in athletes maximum anaerobic test run to 12% (RMSSD pre: 75.8 ± 24.4 ms; RMSSD post: 11.2 ± 5.2; P = 0.008) and non-athletes maximum anaerobic test run to 7% (RMSSD Pre: 47.3 ± 23.2 ms; RMSSD Post: 9.5 ± 9.1 P = 0.045). Conclusion: The maximum anaerobic running test appears to be a model of physiological burdens proper to investigate cardiac autonomic modulation. The athletes showed faster response of the parasympathetic reactivation compared to non-athletes