Acute Effects of Inspiratory Muscle Warm-up on Muscular Performance and Pulmonary Function in Natural Bodybuilders

The present study aims to investigate the acute effects of inspiratory muscle warm-up (IWU) on 1RM performance in professional natural bodybuilders. The hypothesis is that IWU will lead to an increase in the pressure-generating capacity of the inspiratory muscles, thereby resulting in improved 1RM strength performance. The anticipated findings are expected to contribute not only to the enhancement of maximal strength performance but also to the improvement of exercise efficiency through increased respiratory muscle endurance. It is submitted that these outcomes may ultimately provide insights into the long-term sustainability of professional athletes' performance. Twenty male athletes who had competed in national and international professional natural bodybuilding competitions were recruited for this study. The participants had an average experience in natural bodybuilding of 3.21 years, with a standard deviation of ± 1.44 years, and trained for more than five hours per week. The data collection period commenced in July 2025. The study was designed as a randomized controlled experimental trial. Participants were randomly assigned to two groups by a computerized program at three visits after the trial, based on their first measurement: inspiratory warm-up (IWU) group or control (CON) group.

NCT Number	NCT07390149
Lead Sponsor	Gümüşhane Universıty Collaborators: Çankırı Karatekin University
Conditions	Exercise Physiology, Sports Performance
Enrollment	27 participants
Start Date	2025-01-05
Primary Completion	2025-04-15 (estimated)
Study Completion	2026-01-05 (estimated)
Updated on ClinicalTrials.gov	2026-05-07