EFEITOS CARDIOVASCULARES AGUDOS DE UMA SESSÃO DE TREINAMENTO COM SPRINTS SUPER CURTOS EM JOVENS NORMOTENSOS

Abstract

Introduction: The practice of physical exercise is widely recognized for its ability to promote health and improve quality of life. Recently, high-intensity interval training (HIIT) protocols, along with even shorter versions known as sprint interval training (SIT), have been proposed as efficient alternatives to enhance physical capacities in healthy individuals and in the treatment of various health conditions. However, the cardiovascular effects of these modalities during exertion are not well-described. Objectives: To examine the cardiovascular responses during and after a session of super-short sprint interval training of 5 seconds (sSIT) in young, normotensive and active participants (n=10, age 28.2±5.8 years) compared to a training session with longer 20 seconds bouts (SIT20). Methods: The sample consisted of 10 young, normotensive, and physically active individuals. Over the course of three sessions, participants underwent familiarization, incremental testing, and, in a randomized order, performed the sSIT and SIT20 sessions. Heart rate (HR) and blood pressure (BP) measurements were taken at rest before the tests and every 15 minutes after the tests, while HR, BP, and oxygen consumption (VO2) were measured every 2 minutes during the training sessions. Results: The protocols demonstrated similar cardiovascular responses. There was an increase in HR, systolic blood pressure (SBP), and double product (DP) until the 8th minute, followed by a progressive decrease during the rest period. Only the sSIT protocol was able to induce post-exercise hypotension. During the sSIT protocol, participants reached 93.45% (±11.11) of their maximum HR, while in the SIT20 protocol they reached 89.19% (±6.92; p=0.346). Conclusion: It was demonstrated that the SIT protocols with 5- and 20-second intervals behaved similarly, with only the sSIT protocol being able to induce post-exercise hypotension (PEH), and both protocols were found to be safe for training.