Abstract
This paper presents the pilot study of wobble seat on trunk muscles activity and kinematics. For this study the wobble board and wobble board on bearing surface were used to compare muscles activity and body segments kinematics on these different platforms. Two pelvic motions were performed: anterior – posterior and side to side. During this study the electromyography (sEMG) of trunk muscles and motion capture analysis were done. Results showed that sitting on wobble board placed on bearing surface leaded to increment of the activity of deep muscles with smaller pelvic movement in anterior – posterior pelvic motion.
Highlights
Insufficient lumbar stability is known as a potential mechanism which is associated with disability and lower back pain [1]
Side to side pelvic motion on wobble board on bearing surface was higher 80,06°, than on wobble board – 86,20° Fig. 7 most effectively stabilized by regulating the motion of the wobble board placed on bearing surface due to higher activity of deep trunk muscles and lower angle of pelvic motion
Our findings of wobble board placed on bearing surface can be other type of unstable sitting idea
Summary
Insufficient lumbar stability is known as a potential mechanism which is associated with disability and lower back pain [1]. The motor control challenge for the individuals is to use their lumbar spine to minimize the seat displacement, when sitting on unstable surface, with smaller movements representing better performance [1]. This requires a good connection between feedforward and feedback motor control mechanisms. Feedforward control can change lumbar stiffness because of trunk muscle co-contraction. Too much trunk muscle co-contraction can reduce trunk postural control during unstable sitting. The postural control in lower back pain can be affected by factors such as reduction in somatosensory input when visual and vestibular inputs are intact. The more engaging the pelvis motion, the more engaging of the muscles supporting the spine [20]
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