Trunk control ability play an essential part in maintain a standing posture and body stabilization. Thus, trunk stability is relevant to postural balance. For this reason, 3D dynamic device being developed and used for postural balance and trunk stability. So far studies have only evaluated the effect on trunk stabilization exercises but analysis of human movement patterns for active movement and passive movement did not.
In this paper, we was assessed the effect of trunk stability and postural balance of passive and active trunk tilt exercise using 3-D dynamic training system. For this purpose, two experiments were conducted.
First, this study investigated the effects of dynamic postural balance and trunk muscle strength after four week according active/passive training using the system for 3-D dynamic training system. 20 healthy young subjects participated in this experiment. We divide two group as active and passive exercise. They performed exercise that consist of 3-set and 30-times each set on tilt exercise of anterior, posterior, right, left. Also total 4-weeks that exercise 3-days a week each exercise pattern. We measured dynamic postural balance and lumbar joint torque with balance system and biodex system 3. As a result show that active exercise group significantly more improved joint torque in lumbar than passive group. Postural Stability Test was no significant difference in the two groups. However, limits of stability test is significantly increased in the two groups.
Second, we assessed the muscle activity of trunk and leg muscle during passive and active tilt mode on eight tilt directions at tilt angle of 30° using 3-D dynamic training system. 10 healthy young subjects participated in this study. We performed experimental study on the muscular activities of trunk muscle about rectus abdominis(RA), external obliques(EO), latissimus dorsi(LD), erector spinae(ES), and leg muscle about rectus femoris(RF), biceps femoris(BF), tibialis anterior(TA), gastrocnemius(Gn). The experimental results showed the difference of muscular activities at the active/passive exercise mode, tilt directions.
Results, we have found that there is a difference of trunk muscle strength and postural balance ability depending on exercise mode and method. The results indicate that variety of movement patterns can be applied according to form of exercise required users.