The Studies of the Trunk Muscle Strength and the Trunk Flexibility

In order to evaluate the trunk muscle strength and the trunk flexibility, we modified the Kraus-Weber test and applied it _??_ to the healthy workers and the workers of low back pain in the ship industry.There were obvious difference between 1066 healthy workers and 241 workers of low back pain with reference to the trunk raising test, finger-floor distance and straight-leg raising test. Majority of the workers of low back pain revealed weak strength of the abdominal muscles and the back muscles, and decreased trunk flexibility, and high rate of test elicited pain as compared with healthy workers.It was concluded that the strengthening of the abdominal muscled and the maintenance of good flexibility of the trunk were important factors to prevent the low back pain.