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Golf population has increased dramatically as a sports in Korea and golf-related injuries are also increased as well. Because of biomechanical char-acteristics, the golf swing generates a lot of forces to lumbar spine such as compression force, shear force, rotational moment(1). The most common golf injuries are reported in the low back pain which represent 22-24 % of all in professionals(2). To diagnose anatomical problems of lumbar spine, the image techniques are used as an effective analysis for low back pain such as X-ray, CT scan and MRI. However, the utility of these methods were report-ed only 12-15 % low back pain patients who have got a clear anatomical causes since causal com-plexity of low back pain(3). For that reason, it is difficult to distinguish degree of the low back pain and measure the functional lumbar motion by existing image techniques. Recently, the kinematic methods were introduced and evaluated quantitatively the range of motion of lumbar movement, the muscle strength and muscle endurance as a high reliability techniques(4, 5, 6). Mayer et al. reported that it is important recovery sign to the chronic low back pain patients when the pelvic movement return in normal range of motion during rehabilitation(7). It is different from individu-als, usually a pro. golfers can be taken out power about 4 horse power at down swingwhen amuscle of 30 pounds contraction and it takes out this power in the lumbar spine with maximum force at least(8). At the time of golf swing of pro. golfers, shear force and compression reaction force are added to spine and an average maximum shear reaction force is appeared 596N and 329N respectively between amateur an