This aspect may have influenced the pattern of HR response observed in this study when isotonic solution was ingested. In the present study, no hydration also reduced global HRV after exercise. In relation to the SDNN (ms), despite presenting similar behavior in both conditions,

higher values were displayed in the hydrated condition. This finding confirms the influence click here of hydration on post-exercise cardiac autonomic stability. This study has some limitations. The minimum interval between the execution of control and experimental protocols was adhered to, however, some collections were completed over a period longer than a week, which may hinder the interpretation of the variables studied. Urine density was not determined at the end of the control protocol in this study, even though this might have

contributed to the consolidation GSK2399872A in vitro and interpretation of results. However, we were unable to collect urine from the subjects, as they were unable to check details urinate because they were not hydrated. Another important aspect refers to the use of supine rest and recovery conditions, considering that this exercise was performed in the upright position. Although we chose to compare rest and exercise in different positions, we believed Selleckchem Fludarabine that the modifications produced in the parameters during exercise were not influenced by the postural change. However, in addition to being more tolerable for the volunteer, the choice of the supine position during the recovery period has not impaired the results since the parameters were compared to a baseline, with subjects in the same position. Considering the importance of the issue presented, other studies are in progress to evaluate the influence of water intake on cardiac autonomic

modulation and cardiorespiratory parameters. Water ingestion provides rapid gastric emptying, requires no adaptation to the palatability of the solution and offers an economic alternative [39], aspects that are important in the context of hydration during and after exercise. These studies will allow us to evaluate the influence of water intake as a rehydration drink and to compare the effects of the ingestion of isotonic solutions and water as a means of rehydration on cardiac autonomic modulation. Such studies may enrich the knowledge in exercise physiology. Conclusions We concluded that regardless of hydration status, the exercise protocol caused alterations in cardiac autonomic modulation, characterized by increased sympathetic and decreased parasympathetic activity.