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NCT Number: NCT07046637

Acute Effects of Inspiratory Muscle Load on Diaphragmatic Recovery in Athletes

This randomized controlled trial investigates the acute effects of inspiratory muscle warm-up and fatigue on diaphragmatic function in professional basketball players. Using ultrasound imaging and maximal inspiratory pressure (PIM) assessment, the study evaluates changes in diaphragmatic thickness and respiratory strength before and after specific inspiratory muscle loading protocols. Findings aim to clarify the short-term impact of these interventions on diaphragmatic recovery capacity, with potential implications for respiratory training, performance enhancement, and injury prevention strategies in elite athletic populations.

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Key information

Conditions

Sports Physical Therapy Athletic Injuries Healthy Wounds and Injuries

Age range

18 year–35 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Male and female professional basketball players aged between 18 and 35 years.
  • Holding a valid federation license at the autonomous or higher competitive level.
  • A minimum of 3 consecutive seasons of competition in official FEB, FIBA, or equivalent regional leagues.
  • Regular training frequency of ≥4 sessions per week over the past 6 months.
  • No previous experience with inspiratory muscle training.
  • Ability to understand study procedures and provide written informed consent.

Exclusion criteria

  • History of chronic respiratory, neuromuscular, or cardiovascular disease.
  • Musculoskeletal injury limiting inspiratory effort or physical participation (current or within the past three months).
  • Previous thoracic or abdominal surgery.
  • Current smokers.
  • Use of pharmacological treatments that could affect respiratory or muscular function.
  • Participation in another interventional study within the past 4 weeks.
  • Inability to understand or follow study instructions.
  • Tympanic membrane perforation or middle/inner ear pathology.
  • Pregnancy or postpartum period within the last 6 months.

Treatment and study plan

Inspiratory muscle fatigue group

Device

The subjects will perform deep inspirations against a threshold device with varying resistances

Other names: Inspiratory muscle fatigue

Inspiratory muscle warm-up group

Device

The subjects will perform deep inspirations against a threshold device with varying resistances

Other names: Inspiratory muscle warm-up

Primary outcomes

  1. Maximal inspiratory pressure

    Time frame: Immediately before intervention, immediately after intervention, 15 minutes post intervention and 30 minutes post intervention

    It will be assessed using a Breathare MIP/MEP® (GH Innotek Co., Ltd., Busan, Republic of Korea).The Breathare MIP/MEP® is likely a respiratory pressure meter or manometer designed for measuring respiratory muscle strength. It typically includes a mouthpiece connected to a pressure sensor, and the device measures the force or pressure generated during respiratory maneuvers.

    The person will be instructed to take a maximal deep breath in, and then exhale to residual volume. After that, they will be asked to inhale forcefully against the resistance provided by the Breathare MIP/MEP®. This measures the strength of the inspiratory muscles.

    The measures will be expressed in cmH2O.

Secondary outcomes

  1. Diaphragmatic thickness and thickening fraction

    Time frame: Immediately before intervention, immediately after intervention, 15 minutes post intervention and 30 minutes post intervention

    The linear array probe with a frequency of 3.0-10 megahertz (MHz) is placed perpendicularly to chest wall close to the mid-axillary line which is between the 8th and 10th intercostal space. The thickness of diaphragm is measured at the end of expiration and maximum inspiration for three times and the average values were recorded.

    The measures will be expressed in centimeters.

Study contacts

Contact information is provided by the study sponsor or research team.

Arturo Ladriñan, PhD

CONTACT

[email protected]

925 26 88 00

eva V sanz

CONTACT

925 23 10 52

Sponsors and collaborators

Lead sponsor

Sierra Varona SL

Other

Collaborators

  • Universidad Francisco de Vitoria

Registry information

Official study title

Short-Term Effects of Inspiratory Muscle Warm-Up and Fatigue on Diaphragmatic Function in Professional Basketball Players: A Randomized Controlled Trial

Important dates

Study start
2025
Primary completion
2025
Study completion
2025
First posted
Jul 1, 2025
Registry last updated
Jul 3, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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