Analysis of elbow muscle strength parameters in Brazilian jiu-jitsu practitioners

作者：Follmer Bruno; Dellagrana Rodolfo Andre; Pereira de Lima Luis Antonio; Herzog Walter; Diefenthaeler Fernando^*

来源：Journal of Sports Sciences, 2017, 35(23): 2373-2379.

DOI：10.1080/02640414.2016.1267388

• Martial arts
• muscle strength dynamometer
• rate of force development
• torque

Upper-body dynamic and isometric maximum strength are essential components for success in Brazilian jiu-jitsu (BJJ). This study was aimed at analysing strength parameters in the elbow flexor and extensor muscles of BJJ practitioners. Participants (n=28) performed maximum isometric contractions of elbow flexors and extensors to determine peak torque (PT), rate of force development (RFD), and the torque-angle (T-A) relationship at elbow angles of 45 degrees, 60 degrees, 75 degrees, 90 degrees, 105 degrees, and 120 degrees. Additionally, concentric and eccentric PTs were measured at 1.04 rads(-1). Student t-test and ANOVA were performed using =0.05. Elbow flexors were stronger isometrically (P<0.001, ES=1.23) but weaker concentrically (P<0.05, ES=0.54) than extensor muscles, possibly because of the extensive grip disputes and pushing of opponents in BJJ. The T-A relationship had an inverted U-shape. Torque differences across elbow angles were moderate (ES=0.62) for the extensor and large (ES=0.92) for the flexor muscles. Isometric torque was greatest for elbow angles of 105 degrees and 75 degrees and smallest for 45 degrees and 120 degrees for extensor and flexor muscles, respectively. Elbow flexors had a greater RFD than extensors, regardless of elbow angle. The present study provides comprehensive results for elbow muscle strength in BJJ practitioners.

• 出版日期2017