The Effect of Inspiratory Muscle Training on Respiratory Parameters, Balance, Trunk Endurance and Trunk Isokinetic Muscle Strength in Wrestling Athletes

Condition(s) studied

Investigational drug(s) / intervention(s)

Progressive Inspiratory Muscle Training (IMT): The intervention involves the application of inspiratory muscle training using the POWERbreathe Plus device. Training will be conducted at an initial intensity of 50% of the individual's MIP and will be increased weekly by 10%, reaching 80% by week four. Sessions will take place 5 days per week and consist of 2 sets of 30 repetitions per day, with 2-minute rest intervals between sets. This training aims to improve inspiratory muscle strength and endurance, as well as core stability, respiratory function, dynamic balance, and trunk isokinetic strength.

Placebo Training: The placebo group will perform identical training sessions using the same device but with a constant minimal resistance set at 15% of the initial MIP, insufficient to induce a physiological training effect. This intervention is designed to control for placebo response. Assessment protocols will be identical to those in the experimental group.

Study summary

Title:

The Effects of Inspiratory Muscle Training on Respiratory Parameters, Balance, Trunk Endurance, and Trunk Isokinetic Muscle Strength in Elite Female Freestyle Wrestlers

Objective:

This experimental study aims to investigate the effects of inspiratory muscle training on respiratory functions, trunk muscle strength, endurance, and balance in elite female freestyle wrestlers.

Methods:

This randomized controlled trial will include 30 elite female freestyle wrestlers aged between 16 and 22. Participants will be randomly assigned to either an intervention group or a placebo control group using a simple randomization method. The intervention group will receive progressive inspiratory muscle training with the POWERbreathe Plus device, 5 days per week for 4 weeks. The training load will increase weekly. The control group will undergo low-resistance inspiratory training set at 15% of their baseline maximal inspiratory pressure (MIP), serving as a placebo. Pre- and post-intervention assessments will be conducted by a blinded evaluator.

Eligibility

Primary outcome measure(s)

• Change in Maximal Inspiratory Pressure (MIP) [cmH₂O] — Baseline (Week 0) and Post-intervention (Week 4)
  Maximal inspiratory pressure (MIP) will be measured using the Cosmed Pony FX device. This value reflects the strength of inspiratory muscles before and after the intervention.
• Change in Maximal Expiratory Pressure (MEP) [cmH₂O] — Baseline (Week 0) and Post-intervention (Week 4)
  Maximal expiratory pressure (MEP) will be assessed using the Cosmed Pony FX spirometer. It indicates the force generated by expiratory muscles and will be compared pre- and post-training.
• Change in Forced Expiratory Volume in 1 Second (FEV1) [liters] — Baseline (Week 0) and Post-intervention (Week 4)
  FEV1 will be measured using the Cosmed Pony FX to evaluate pulmonary function. The value reflects the volume of air expelled in the first second of a forced exhalation.
• Change in Forced Vital Capacity (FVC) [liters] — Baseline (Week 0) and Post-intervention (Week 4)
  FVC will be assessed with the Cosmed Pony FX device. It measures the total volume of air forcibly exhaled after a full inspiration, used to evaluate lung capacity changes due to training.
• Change in FEV1/FVC Ratio [%] — Baseline (Week 0) and Post-intervention (Week 4)
  The FEV1/FVC ratio will be calculated from pulmonary function testing to assess airway function and efficiency. The ratio will be compared between baseline and after the 4-week intervention.

Trial sites (1)

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