Effects of Surgical Correction of Nasal Obstruction on Oxygen Uptake and Ventilation Volume

This retrospective study aims to evaluate the effect of surgical correction of nasal obstruction on aerobic performance parameters in male athletes aged 20-32 years. The main questions it aims to answer are: * Does nasal obstruction surgery impact running economy and ventilation during exercise? * Does it affect oxygen consumption during submaximal running efforts? Researchers will retrospectively compare male athletes who underwent nasal obstruction surgery (experimental group) to matched athletes without nasal obstruction (control group) to assess changes in respiratory function and exercise performance. Participants were assessed by: * Acoustic rhinometry to measure nasal cavity dimensions. * The Nasal Obstruction Symptom Evaluation (NOSE) scale and Epworth Sleepiness Scale (ESS) to evaluate nasal obstruction symptoms and daytime sleepiness. * Incremental treadmill exercise tests to collect data on gas exchange, oxygen consumption, ventilation, and running economy before and after the surgical intervention (or across a similar time period for the control group).