An accelerometer and a gyroscope were used to examine patients with postural control related diseases in many studies. The aim of this study was to test the coherence of a wearable device an inertial measurement unit imu against the gold standard.
Measures Of Postural Stability
Body sway measurement. A certain amount of sway is essential and inevitable due to small perturbations within the body eg breathing shifting body. This study has a cross sectional design where measurement of postural sway in the medio lateral and anteriorposterior directions was performed simultaneously on a force plate and with a imu called the snubblometer. Sway is the horizontal movement of the centre of gravity even when a person is standing still. The data sampling frequency was 20 hz. Significant gender differences were found in the left right sway and the high frequency band power factors but the influence on body sway is as a whole can be disregarded. A sway is defined as any excessive lower body lateral movement away from the target during your backswing that forces your weight to the outside of your trail side foot.
Body sway is evaluated. Also to test the intra trial reliability. Systems have been used for body sway measurement. Sway model 21human body is modelled as a rigid weightless inverted pendulum with a point mass m at the height h of the bodys center of mass com rotating around a single link ankle. Evaluation of upright posture control and the like of visibility is also performed by a value romberg rate divided by d. This swing characteristic makes it very difficult to develop a proper weight shift during transition and the downswing.
The measurement device used was an animas stabilometer g5500. In biomechanics balance is an ability to maintain the line of gravity vertical line from centre of mass of a body within the base of support with minimal postural sway. One advantage of us ing a motion capture system is the capability of measurin g body. Also the body sway measurement is performed in two states of closed eyes and open eyes and the outer peripheral area d in the closed eye measurement is calculated as the outer peripheral area in the open eye measurement. Some studies used either an accelerometer or a gyroscope attached to the head chest or waist to obtain the balance assessment parameters of body sway such as area direction etc. Postural sway in quite standing is often studied as a measure of postural control.
Reliability of 4 body sway factors was very high. B y measuring the positions of the light emitting marke rs the position of the body segments can be tracked and t hen the com position can be calculated. This study investigated the human body sway measuring instruments. Many instruments ranging from simple ones like lords sway meter to high end ones like force plates are used to. These specific characteristics of the body sway are influenced by several factors such as the size of the support area the high of the center of gravity age injury etc.
Gallery of Body Sway Measurement
