ANALYSIS OF CARDIAC AUTONOMIC AND METABOLIC FUNCTION IN HIITCE ATHLETES IN DIFFERENT FUNCTIONAL CONDITIONS: AN EXPLORATORY CROSS-SECTIONAL STUDY
High-intensity interval training, aerobic training, cardiovascular physiological phenomena.
In the literature it is already well documented that regular endurance physical training has a positive effect on cardiac autonomic function in different functional conditions such as rest, effort and recovery immediately after effort. However, there is still a few information about the effect of regular high-intensity interval training combined with different types of exercise (HIITCE) on cardiac autonomic function under different functional conditions. In addition, information is lacking on the metabolic adjustments of HIITCE practitioners during different phases of maximal incremental effort and recovery. Thus, the objective of the present study is to analyze the dynamics of cardiac autonomic function and cardiometabolic response during rest, different maximal incremental effort and recovery phases in athletes practicing HIITCE. This is an observational, cross-sectional study with 18 male individuals, clinically healthy and aged between 20 and 40 years, athletes practicing HIITCE (eg Crossfit®). Cardiac autonomic function was assessed using heart rate variability (activity, reactivity and reactivation) and cardiometabolic response assessed by gas exchange (ergospirometry). Variables related to autonomic (RMSSD and DFA alpha 1) and cardiometabolic (VO2, VCO2) behavior were analyzed in different stages of effort and recovery. For data processing, Kubios HRV software, Microsoft Excel and Statistical Package Social Sciences (SPSS 22) and GraphPad Prism 6 will be used. recovery). Differences between phase comparisons will be considered statistically significant P ≤ 0.05 and observed effect size. The alternative hypothesis of the present study is that the cardiac autonomic and cardiometabolic behavior of HIITCE athletes at rest, effort phases and recovery will be similar to that found in the literature in Endurance athletes