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.
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
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
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.
Other
Cross-sectional
Not listed
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.
Maximal Inspiratory Pressure
The highest acceptable maximal inspiratory pressure meeting prespecified reproducibility criteria, recorded in centimeters of water (cmH2O). Higher values indicate greater inspiratory muscle strength.
Maximal Expiratory Pressure
The highest acceptable maximal expiratory pressure meeting prespecified reproducibility criteria, recorded in centimeters of water (cmH2O). Higher values indicate greater expiratory muscle strength.
Maximum Static Kimono Grip Test Time
Maximum time, in seconds, that the participant maintains a suspended position with maximal elbow flexion while gripping a kimono wrapped around a horizontal bar. Higher values indicate greater static kimono grip endurance.
Forced Vital Capacity (FVC)
Forced vital capacity measured by spirometry and recorded in liters (L). Percent-predicted and z-score values will also be documented when available. Higher values generally indicate greater ventilatory volume, with interpretation based on appropriate reference limits.
Click on the lead sponsor to view all of their trials.
This trial is not recruiting at the moment. You can still explore other options:
