Respiratory Muscle Strength and Jiu-Jitsu-Specific Performance in Male Brazilian Jiu-Jitsu Athletes

NCT07794241 | Not Yet Recruiting

• 1 other identifier: HALICU-BJJ-2209-001
• Study Type: observational
• Target: 40
• Locations: 1 country
• Sites: 1

Brief Summary

Brazilian Jiu-Jitsu (BJJ) is an intermittent combat sport that requires repeated high-intensity efforts and sustained gripping. This analytical cross-sectional study will examine whether respiratory muscle strength is associated with BJJ-specific anaerobic performance and static kimono grip endurance in adult male BJJ athletes. Forty athletes will attend three assessment visits separated by 48 to 72 hours. Maximal inspiratory pressure, maximal expiratory pressure, and spirometric indices (forced vital capacity \[FVC\], forced expiratory volume in 1 second \[FEV1\], FEV1/FVC ratio, and peak expiratory flow \[PEF\]) will be measured at the first visit. The Jiu-Jitsu Anaerobic Performance Test and the Maximum Static Kimono Grip Test will be completed at the other two visits in randomized order. The primary analysis will examine the association between maximal inspiratory pressure and the total number of valid repetitions completed during the Jiu-Jitsu Anaerobic Performance Test. Spirometric indices will be evaluated as secondary outcomes.

Conditions

Athletic Performance

Keywords

Brazilian Jiu-Jitsu; Respiratory Muscle Strength; Maximal Inspiratory Pressure; Maximal Expiratory Pressure; Anaerobic Performance; Kimono Grip Endurance; Spirometry; Pulmonary Function

Outcome Measures

Primary Outcomes (1)

• Jiu-Jitsu Anaerobic Performance Test Total Valid Repetitions

  Total number of valid butterfly-guard lifting repetitions completed across five 60-second work bouts separated by 45 seconds of passive recovery. Higher values indicate better BJJ-specific anaerobic performance.

  At Visit 2 or Visit 3, within 6 days after Visit 1

Secondary Outcomes (7)

• Maximal Inspiratory Pressure

  At Visit 1

• Maximal Expiratory Pressure

  At Visit 1

• Maximum Static Kimono Grip Test Time

  At Visit 2 or Visit 3, within 6 days after Visit 1

• Forced Vital Capacity (FVC)

  At Visit 1

• Forced Expiratory Volume in 1 Second (FEV1)

  At Visit 1

Study Arms (1)

Male Brazilian Jiu-Jitsu Athletes

Adult male Brazilian Jiu-Jitsu athletes who train regularly and complete spirometric pulmonary function, respiratory muscle strength, BJJ-specific anaerobic performance, and static kimono grip endurance assessments. No intervention will be assigned.

Eligibility Criteria

• Age: 18 Years - 40 Years
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)
• Sampling Method: Non-Probability Sample

Study Population

Adult male Brazilian Jiu-Jitsu athletes who train regularly at clubs or academies in Istanbul, Türkiye, and meet the prespecified eligibility criteria. Participants will be recruited by non-probability sampling.

You may qualify if:

• Male sex
• Age 18 to 40 years
• At least 1 year of Brazilian Jiu-Jitsu experience
• Brazilian Jiu-Jitsu training on at least 2 days per week during the previous 3 months
• Familiarity with gi/kimono training and the butterfly-guard lifting movement
• Ability to safely and technically perform the Maximum Static Kimono Grip Test and the Jiu-Jitsu Anaerobic Performance Test
• Provision of written informed consent

You may not qualify if:

• Diagnosed cardiovascular, respiratory, neurological, metabolic, or musculoskeletal condition that may affect maximal testing or participant safety
• Active pain, acute injury, or relevant surgery during the previous 6 months
• Current regular use of cigarettes, electronic cigarettes, or inhaled nicotine products
• Medical advice to avoid maximal physical effort
• Regular use of medication that may materially affect study measurements

Sponsors & Collaborators

• Halic University: lead

Study Sites (1)

Roger Gracie Academy Turkey

Istanbul, 34337, Turkey (Türkiye)

Location

Study Design

• Study Type: observational
• Observational Model: OTHER
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: August 25, 2026
• First Posted: August 31, 2026
• Study Start: October 1, 2026
• Primary Completion (Estimated): April 1, 2027
• Study Completion (Estimated): April 1, 2027
• Last Updated: August 31, 2026

Record last verified: 2026-08

Locations

TU (1)