Effects of Inspiratory Training on Respiratory Function in Swimming

Brief Summary

Introduction: The diaphragm is the primary inspiratory muscle and plays a key role in ventilation, trunk stability, and exercise efficiency. Its dysfunction is associated with early fatigue, increased respiratory work, and reduced performance. Inspiratory muscle training (IMT) has been shown to improve respiratory function and exercise tolerance. Swimming, due to its specific characteristics, imposes an additional demand on the respiratory muscles. Objective: To evaluate the effects of an IMT program on diaphragmatic function, respiratory variables, cardiorespiratory response, and performance in swimmers. Methods: A randomized, parallel, double-blind clinical trial with 34 swimmers. The experimental group will perform an 8-week IMT program with progressive loads, while the control group will use a sham device without resistance. Diaphragmatic function will be assessed using ultrasound (thickness and excursion), along with respiratory variables (MIP, FEV₁, MEP, FVC), cardiovascular variables (heart rate, HRV), metabolic variables (lactate), and performance (100 m test). Expected results: IMT is expected to improve diaphragmatic function, increase inspiratory muscle strength, enhance ventilatory efficiency, and reduce respiratory fatigue, leading to improvements in performance and physiological responses to exercise. Conclusion: IMT could be an effective strategy to enhance respiratory function and swimming performance. This study provides a novel approach by incorporating ultrasound assessment of the diaphragm in an aquatic exercise context.