The grip strength endurance is important for Brazilian Jiu-Jitsu (BJJ). Thus, the aims of this study were: a) to test the reliability of two kimono grip strength tests named maximum static lift (MSL) and maximum number of repetitions (MNR) and b) to examine differences between elite and non-elite BJJ players in these tests. Material and Methods: Thirty BJJ players participated into two phases: "A" to test reliability and "B" to compare elite and non-elite. In phase A, twenty participants performed the MSL and, 15 min later, the MNR in two occasions with 24-h interval. In phase B, ten other BJJ practitioners (non-elite) and ten athletes (elite) performed the same tests. The intraclass correlation coefficient (ICC) two way fixed model (3,1), Bland-Altman plot and the limits of agreement were used to test reliability, correlation between the tests were evaluated by Pearson correlations and independent T test (P<0.05) was utilized to compare elite vs non-elite. Results: The ICC was high for repeated measurements on different days of phase A (MSL: r = 0.99 and MNR: r = 0.97). Limits of agreement for time of suspension were -6.9 to 2.4-s, with a mean difference of -2.3s (CI: -3.3 to -1.2-s), while for number of repetitions the limits of agreement were -2.9 to 2.3-rep, with a mean difference of -0.3-rep (CI: -0.9 to 0.3-rep). In phase B, elite presented better performance for both tests (P<0.05) compared to non-elite (56±10-s vs 37±11-s in MSL and 15±4-rep vs 8±3-rep in MNR). Moderate correlation were found between MSL and MNR for absolute values during test (r = 0.475; p = 0.034), and retest phases (r = 0.489; p = 0.029), while moderate and high correlations in the test (r = 0.615; p = 0.004) and retest phases (r = 0.716; p = 0.001) were found for relative values, respectively. Conclusions: These proposed tests are reliable and both static and dynamic grip strength endurance tests seem to differentiate BJJ athletes from different levels.
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