The Influence of Gas Exchange Mechanisms on Exercise Tolerance in the Severe and Extreme Intensity Domains

• Grant number: 24/09303-0
• Support Opportunities: Scholarships in Brazil - Master
• Start date: October 01, 2024
• Status: Discontinued
• Field of knowledge: Health Sciences - Physical Education
• Principal Investigator: Camila Coelho Greco
• Grantee: Rubens Correa Junior
• Host Institution: Instituto de Biociências (IB). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil
• Associated scholarship(s): 25/01037-2 - VO2 Kinetics and Ventilatory Mechanisms: A Relationship to Decreased Tolerance Between Severe and Extreme Intensities, BE.EP.MS

Abstract

As the intensity and exercise duration increase, the factors limiting tolerance capacity also vary. In the severe and extreme intensity domains, exercise is characterized by high energetic, cardiorespiratory, and metabolic demands. Consequently, these characteristics significantly influence how long the individual will be able to maintain such intensity. Although the importance of anaerobic metabolism in providing energy quickly, especially in these intensities, evidence indicates that aerobic metabolism factors can modulate the amplitude of intensities domains and influence the capacity to tolerate these exercises. On the other hand, a recent finding indicates that the mechanisms of the neuromuscular fatigue process alone do not explain the reduction in the tolerance with increasing intensity between the severe and extreme domains. In this regard, little is known about how the gas exchange mechanism influences the reductions of efficiency of multiple physiological mechanisms that determine exercise tolerance within these domains. Therefore, the current research project aims to: Investigate the relationship between the intensity increase and the efficiency of gas exchange mechanisms during the exercise, as well as recovery after efforts performed in the severe and extreme domains until exhaustion. A cross-sectional experiment will be conducted with healthy men with high experience in cyclists, including 9 to 10 visits to the laboratory. This research will evaluate variables associated with the efficiency of gas exchange mechanisms, VO2 kinetics (time and amplitude), and tolerance to exercises performed in the severe and extreme intensity domains.