Abstract: To study validity and reliability of the modified elbow attachment (mEA) of Biodex. Methods 25 healthy volunteers participated in the study. The tester A used mEA and standard elbow attachment (sEA) separately to test right elbow flexor and extensor of these volunteers within a day. The tester B used mEA to assess the same muscles of the same volunteers 3 days later. The correlation between mEA and sEA were analyzed to test the validity and reliability of mEA. Results mEA was highly correlated with sEA in all isokinetic test data (P<0.05). The interclass correlation coefficients (ICC) were more than 0.75 in most isokinetic test data (P<0.05). Conclusion The mEA has a good validity and reliability.

Key words: modified elbow attachment of Biodex, validity, reliability