Acute Effects of Functional Inspiratory Muscle Training in Elite Male Volleyball Players

Condition(s) studied

Investigational drug(s) / intervention(s)

Functional Inspiratory Muscle Training With POWERbreathe: A POWERbreathe pressure-threshold inspiratory muscle training device is used during a sport-specific fixed-ball throwing drill after warm-up. Before training, maximal inspiratory pressure is measured using a mouth pressure meter. The device resistance is individualized at 50% of maximal inspiratory pressure. Participants complete two sets of 30 resisted inspirations, totaling 60 breaths, over approximately 10 to 12 minutes. Expiration is unrestricted. The intervention is delivered once.

Study summary

This randomized controlled trial evaluates the acute effects of a single session of functional inspiratory muscle training on muscle oxygenation, exercise capacity, dynamic balance, and agility in elite male volleyball players aged 18 to 25 years. Thirty participants will be randomly assigned in a 1:1 ratio to an intervention group or a no-intervention control group. The intervention group will perform 60 resisted breaths at 50% of maximal inspiratory pressure using a POWERbreathe device during a sport-specific fixed-ball throwing drill. Both groups will complete assessments before and immediately after the intervention period on the same day. Quadriceps muscle oxygen saturation and total hemoglobin will be measured using a Moxy near-infrared spectroscopy monitor during the Incremental Shuttle Walk Test. Exercise capacity, dynamic balance, and agility will be assessed using the Incremental Shuttle Walk Test, Star Excursion Balance Test, and T-Test, respectively.

Eligibility

Primary outcome measure(s)

• Change in Quadriceps Total Hemoglobin During the Incremental Shuttle Walk Test — Baseline and immediately after the single-session intervention or control period, within the same day
  Total hemoglobin (THb, g/dL) will be recorded continuously using a Moxy near-infrared spectroscopy monitor positioned over the midpoint of the right quadriceps femoris. Mean THb will be summarized separately for the pre-exercise rest, exercise, and recovery phases of the Incremental Shuttle Walk Test. For each phase, change will be calculated as the post-intervention value minus the pre-intervention value. The primary comparison will be the difference in pre-to-post change between the intervention and control groups.
• Change in Quadriceps Muscle Oxygen Saturation During the Incremental Shuttle Walk Test — Baseline and immediately after the single-session intervention or control period, within the same day
  Muscle oxygen saturation (SmO2, %) will be recorded continuously using a Moxy near-infrared spectroscopy monitor positioned over the midpoint of the right quadriceps femoris. Mean SmO2 will be summarized separately for the pre-exercise rest, exercise, and recovery phases of the Incremental Shuttle Walk Test. For each phase, change will be calculated as the post-intervention value minus the pre-intervention value. The primary comparison will be the difference in pre-to-post change between the intervention and control groups.

Trial sites (1)

More Gazi University trials in Turkey

Other trials for the same condition