Heart rate asymmetry (HRA) refers to how asymmetrically the acceleration and deceleration patterns in heartbeat fluctuations are distributed. There is limited evidence regarding HRA changes in athletes and their association with autonomic regulation. This study aimed to compare the short-term HRA of high-performance athletes and non-athletes during an autonomic function test by calculating relevant HRA measures. This exploratory study obtained beat-to-beat RR interval time series from 15 high-performance athletes and 12 non-athletes during a standardized autonomic function test. This test includes rest, postural change, controlled respiration, prolonged orthostatism, exercise, and recovery phases. The following HRA parameters were computed from the RR time series for both groups: asymmetric spread index (ASI), slope index (SI), Porta’s index (PI), Guzik’s index (GI), and Ehlers’ index (EI). We found significant differences (p < 0.01) in the mean value of several HRA parameters between athletes and non-athletes and across the autonomic function test phases, mainly in postural change and recovery phases. Our results indicate that high-performance athletes manifest a higher number and magnitude of cardiac decelerations than non-athletes after an orthostatic challenge, as indicated by GI and EI. In addition, lower HRA was found in athletes in the recovery phase than in non-athletes, as indicated by ASI.

Soccer is the most popular sport in the world, with a growing number of professional players every year. In addition, it is complex and unpredictable with multiple physical, technical, tactical and psychological problems that are critical for performance. In the 90’s, tool-based performance analysis included global positioning systems and optical tracking systems for each player. For this reason, the aim of this study was to analyze physical and technical variables related to the outcome of the game, and the fact that a team qualifies for the different phases of FIFA’s 2018 Russia World Cup. The analysis encompassed all the games played during the 2018 Russia FIFA World Cup—up to 64 games of the 32 participating national teams. A goal score could be insufficient for defining a team’s success, since this variable depends on different and multiple factors. The teams that qualified for the knockout stage showed significantly better performance in some technical variables. On the other hand, regarding physical variables, the most successful teams covered shorter distances with and without the ball, presenting more significant distances in intensity zones 1 and 5 and ball possession. These different aspects are worth analyzing in order to determine their relationship to success in a game.

The heart is innervated by the autonomic nervous system (ANS), which plays a role in regulating the heart rate. Cross-country mountain biking (MTBXC) is a sport with high physiological demands, where the autonomic nervous system plays a significant role. The main objective of this study was to analyze the asymmetry of heart rate in Colombian National Team mountain bikers, sub-23 category, during a 20 min cardiovascular autonomic profile test. Method: The cardiovascular autonomic profile was measured through heart rate variability during a 20 min test, divided into eight phases (supine, controlled ventilation at 10 cycles/min, controlled ventilation at 12 cycles/min, postural change, orthostasis, Ruffier test, 1 min recovery, and final recovery) in a group of n = 10 MTB cyclists from the National Sub-23 Team, including 5 males and 5 females. Results: The results for the male athletes were as follows: age: 19 ± 1 years; VO2max: 67.5 mL/kg/min; max power: 355 W; HRmax: 204 bpm. The results for the female athletes were as follows: age: 19 ± 1 years; VOmax: 58.5 mL/kg/min; max power: 265 W; HRmax: 194 bpm. Both genders showed the expected autonomic behavior in each phase. Asymmetrical propagation of heart rate was observed, with a greater deceleration pattern after postural changes and effort and a symmetrical acceleration pattern in these two phases. Discussion: Athletes exhibit increased vagal response compared to non-athletes. Mountain bikers show rapid heart rate reduction after exertion. Conclusion: This study demonstrates how mountain bikers exhibit increased heart rate deceleration following sympathetic stimuli.

Soccer is the most popular sport in the world, with a growing number of professional players every year. In addition, it is complex and unpredictable with multiple physical, technical, tactical and psychological problems that are critical for performance. In the 90’s, tool-based performance analysis included global positioning systems and optical tracking systems for each player. For this reason, the aim of this study was to analyze physical and technical variables related to the outcome of the game, and the fact that a team qualifies for the different phases of FIFA’s 2018 Russia World Cup. The analysis encompassed all the games played during the 2018 Russia FIFA World Cup—up to 64 games of the 32 participating national teams. A goal score could be insufficient for defining a team’s success, since this variable depends on different and multiple factors. The teams that qualified for the knockout stage showed significantly better performance in some technical variables. On the other hand, regarding physical variables, the most successful teams covered shorter distances with and without the ball, presenting more significant distances in intensity zones 1 and 5 and ball possession. These different aspects are worth analyzing in order to determine their relationship to success in a game.