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The purpose of this study was to investigate how much the ratio of muscle fiber composition and strength is changed after power or endurance training. Twelve participants were randomly allocated to a endurance group or a power training group. Subsequently each group performed power & endurance training program 2 days per week for 10 weeks. To analyze composition of lumbar muscle fiber-type, fatigue response test(FRT) and back extensor strength was performed before, in and after training program using a MedX lumbar extension machine. The results are as the followings. The inroad of the endurance training group showed a tendency to decrease as before 51.7%, mid-term 27.7%, after 19.6%. As the inroad of muscle fatigue before 14.7%, mid-term 38.2%, after 65.6%, it was tended to increase in the power training group. The inroad of the power training group showed increased 25.23% of back extension strength than endurance training group. At the conclusion of this study, when the power or endurance training applying to the normal person, there was difference of useful which changes the lumbar muscle fiber-type.