| Grant number: | 17/13402-0 |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| Start date: | January 01, 2018 |
| End date: | August 31, 2020 |
| Field of knowledge: | Health Sciences - Physiotherapy and Occupational Therapy |
| Principal Investigator: | Aparecida Maria Catai |
| Grantee: | Raphael Martins de Abreu |
| Host Institution: | Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil |
| Associated scholarship(s): | 18/11123-0 - INNOVATIVE ANALYSIS OF CARDIOVASCULAR AUTONOMIC CONTROL IN CYCLISTS AFTER DIFFERENT INTENSITIES OF INSPIRATORY MUSCLE TRAINING: CONTROLLED AND RANDOMIZED CLINICAL STUDY, BE.EP.DD |
Abstract Introduction: The inspiratory muscle training (IMT) has been studied as a not conventional method to improve the performance of athletes, due your contribution to reduction of dyspnea and peripheral muscle fatigue, which are the main limiting of sports. However, little is known about the effects of IMT on cardiovascular autonomic control, as well as, on the baroreflex sensitivity (BRS), which are determinants factors to maintain of cardiovascular homeostasis and responsible for heart rate and arterial pressure control, both at rest and during sports activity. Autonomic control can be evaluated indirectly through the analysis of heart rate and blood pressure variability (HRV and VPA, respectively), which are influenced by SBR. Some studies have identified the influence of IMT on cardiac autonomic control in the reduction of resting sympathetic modulation, represented in the HRV spectral analysis, however, the physiological mechanisms of the IMT operates are still inconclusive in the literature. In addition, it is not known to recognize a VPA and SBR in humans, and they allow it to elucidate and bring additional information about responses to autonomic vascular adaptations after training. Objective: To evaluate the effects of different intensities of IMT on cardiovascular autonomic control in recreational cyclists. Materials and Methods: Thirty recreational cyclists male, aged 20 to 40 years, they will be randomly divided in three training groups: Sham Group (SG), Critical Power Group (PTHCG) and 60% of MIP Group (60G). After screening and clinical evaluation, the individuals will be submitted to 11 weeks of IMT, with a weekly frequency of 3 sessions and duration of 1 hour each session, with the calculation of the exercise load, in according to the allocated group. The HRV, APV, BRS, as well as, the test of strength and resistance muscular respiratory and cardiopulmonary test, will be obtained in pre and post intervention times. There will be a descriptive analysis of the three groups, the normality of the data will be evaluated by the Shapiro-Wilk test and homogeneity by the Levene test. For comparison between groups of training, will be used parametric and non-parametric tests, according to the data distribution. The significance level will be fixed in p<0,05. Expected Results: It is expected that at the end of 11 weeks of TMI, when compared the groups (PTHCG, SG and 60G), present distinct cardiovascular autonomic responses, allowing to elucidate which better training load that benefits this system. In addition, the results will allow later investigation of this protocol in patients whose clinical characteristics are autonomic dysfunction and/or dysautonomia. | |
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