Inspiratory Muscle Warm-Up and Strength in Bodybuilders

The POWERbreathe device (IMT Technologies Ltd., Birmingham, UK) was used for inspiratory muscle warm-up (IWU). For the IWU protocol, the resistance of the POWERbreathe device was set to 40% of the participant's maximal inspiratory pressure (MIP). While standing, participants were instructed to perform two sets of 30 breaths (inspiratory and expiratory), with a 60-second rest interval between sets (Koizumi \& Ohya, 2023).

No intervention