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[Purpose] The purpose of this study was to determine the effect of two different drop landing tasks on knee kinematics and muscle activities.[Subjects] Nine healthy males participated in this study.[Methods] The subjects performed two different drop landing tasks from a box (height, 30 cm), with the dominant leg and both legs. A motion analysis system was used to obtain knee valgus and maximal flexion angles in the frontal and sagittal planes. An electromyography system was used to record muscle activities of the lower extremities during the drop landing task.[Results] Single leg landing increased the knee valgus angle, decreased the knee flexion angle, and increased the activity of the lower extremity muscles as compared to double leg landing.[Conclusion] Increased knee valgus angle and decreased knee flexion angle with single leg landing may be related to the increased risk of anterior cruciate ligament injury.

Background: This study aimed to investigate the effects of isometric exercise using ATM®2 for acute low back pain (LBP) patients as a flexion or extension type. Methods: The subjects were twenty individuals (age 39.7±8.0ys, 12 males / 8 females) with acute LBP of less than four weeks duration who volunteered to participate in the study. The participants were allocated into four groups. First, the participants were classified by the direction of the movement causing pain in flexion and extension types. Secondly, both types were allocated randomly into two groups which were given exercises using the ATM®2 group and the usual care group. Finally, both groups were treated three times weekly for two weeks, totaling six sessions. Results: In terms of the extension type of LBP, the effect of the extension pain in the ATM®2-group significantly decreased pain (p=0.04) immediately. And in both groups significantly decreased (p=0.01, 0.001) for two weeks of intervention. Furthermore, in the flexion type of LBP, the effect of the flexion pain in the ATM®2-group and usual care group significantly decreased (p=0.001, p=0.03) during the two weeks intervention. However, neither group had an immediate effect. Conclusion: Isometric exercise using ATM®2 may have an immediate and short-term effect on acute LBP, which is greater in patients with an extension-type pattern. The ATM®2 exercise may reduce the pain of the acute LBP. Furthermore, it will be a problem in the future to analyze if the influence of pain is reduced in the immediate natural period that gives to chronic LBP.

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