Efeitos da hiperventilação hipocápnica mista sobre o desempenho intermitentedissertation
Аннотация: Background: The use of ergogenic strategies, such as beta-alanine or sodium bicarbonate supplementation, has been widely investigated to increase performance in high-intensity intermittent exercises through the improvement of intra-and extracellular buffering.In this context, voluntary hyperventilation appears as an alternative method that can rapidly induce alkalosis through breathing, reducing the partial pressure of carbon dioxide, generating hypocapnia.However, this issue is still controversial, and it is still unclear whether there are positive mechanisms related to hypocapnia, and how much of a placebo mechanism may have occurred in previous studies given the intervention consists of respiratory control.The effects of hypocapnia seem to be brief, so to sustain it throughout interval exercise, the combination of hyperventilation protocols appears interesting.The aim of this study was to test the combined and isolated effects of long and short hypocapnic voluntary hyperventilation protocols on energy metabolism and high-intensity intermittent performance, and to verify a possible placebo effect in this mechanism of modulation of respiratory control through placebo oxygen.Methods: Twelve athletes performed the intermittent performance test (10 sprints of 10 s interspersed by 60 s intervals), in the following experimental conditions: Control, Placebo, Long hyperventilation + Placebo, Placebo + Short hyperventilation, Long hyperventilation + Short hyperventilation.Results: There was no effect of condition on sprint performance in relation to peak power (p = 0.145), average power (p = 0.264), total work done throughout the entire exercise session (p = 0.683) or the contribution of the energy systems (in absolute values of total caloric expenditure; p = 0.272).Conclusion: There was no ergogenic effect of long or short hyperventilation on performance of repeated sprints.Additionally, there was no expectation effect of an intervention on respiratory modulation, suggesting that the expectation of placebo oxygen does not seem to impact the performance of repeated sprints.
Год издания: 2021
Авторы: Pietro Merola
Ключевые слова: Cardiovascular and exercise physiology, High Altitude and Hypoxia, Sports Performance and Training
Открытый доступ: gold