Inspiratory Muscle Training in Amateur CrossFit® Athletes

Recruiting now · Not applicable

Conditions studied: Healthy

In brief

The aim of this randomized controlled trial is to investigate the effectiveness of inspiratory muscle training (IMT) on the performance of athletes in CrossFit® activities, respiratory muscle strength, and perceived post-training fatigue. This study follows a two-arm randomized controlled trial protocol. Ninety-four volunteers aged between 18 and 60 years, enrolled in CrossFit® training, will be randomly allocated to the IMT Group, which involves respiratory training using a linear load device (Powerbreathe®) in conjunction with CrossFit® training; or the Non-IMT Group, which undergoes the same training as the intervention group but uses a device without a valve that ensures resistance. The primary outcome is to investigate the effectiveness of IMT: on maximum inspiratory pressure and maximum expiratory pressure. The secondary outcomes include performance in the six-minute walk test, Pistol, Burpee, Sit-up, Box Jump, Thruster, and Single-Under, burning 25 calories on the "Air Bike" measured by the time taken to reach the 25-calorie mark on this equipment, as well as the assessment of subjective fatigue perception. All outcomes of interest will be collected at baseline and reassessed: mid-term (8 weeks after allocation); and long-term (12 weeks after allocation), the IMT and MEP will be reassessed. Analyses will follow the intention-to-treat principle. Treatment effects will be assessed using Linear Mixed Models. The results of this study may help clarify the effects of IMT on CrossFit® athletes.

Key facts

Study ID: NCT06807957
Run by: Federal University of the Valleys of Jequitinhonha and Mucuri
People needed: 94
Starts: 2026-01-01
Expected to finish: 2027-03-30
Last updated by the study team: 2026-01-27

Who can join

Age: 18 and older, up to 60. Sex: any. Healthy volunteers: accepted.

You may qualify if…

Age between 18 and 60 years;
Be enrolled in a CrossFit® program;
Be available to perform TMI at home 5 days a week.

You may not qualify if…

Have any musculoskeletal, cardiovascular and/or neurological condition that prevents CrossFit® and/or IMT from being performed;
Be a smoker;
Not sign the Termo de Consentimento Livre Esclarecido (TCLE);
Be performing or have performed IMT using linear load equipment in the last month.

Where it is running

Academia Compasso - Kapura — Sete Lagoas, Minas Gerais, Brazil (enrolling)

Full record on ClinicalTrials.gov

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