Factors Affecting Test Results and Standardized Method in Quiet Standing Balance Evaluation
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Objective To identify factors affecting test results of the quiet standing balance evaluation conducted by posturography and to investigate the standardized method by comparing results according to feet width. Method Th e study cohort consisted of 100 healthy individuals. We assessed the quiet standing balance of subjects by using 3 diff erent methods: standing on a force plate with feet width the same as shoulder width (test 1); with feet width the same as half the shoulder width (test 2); with feet width determined by the subject’s comfort (test 3). Subjects underwent each test with their eyes open and closed for 30 seconds each time. Parameters for measuring standing balance included the mean mediolateral and anteroposterior extent, speed, and the velocity moment of center of pressure (COP) movement. Results All parameters showed better results when the subject’s eyes were open rather than closed, and the mean AP extent and speed increased as the age of the subjects increased (p<0.01). However, there was no signifi cant correlation between height and the study parameters, and no differences between men and women. Mean mediolateral extent and speed were signifi cantly longer and faster in test 1 compared with tests 2 and 3 (p<0.01). Th e results of test 2 were better than the results of test 3, but the diff erence was not statistically signifi cant. Conclusion COP movements increased with age and when subjects closed their eyes in an evaluation of quiet standing balance conducted by posturography. Gender and height did not aff ect results of the test. We suggest that an appropriate method for conducting posturography is to have the subject stand on a force plate with their feet width the same as half the shoulder width, because this posture provided relatively accurate balance capacity.
Abstract
Objective To identify factors affecting test results of the quiet standing balance evaluation conducted by posturography and to investigate the standardized method by comparing results according to feet width. Method Th e study cohort consisted of 100 healthy individuals. We assessed the quiet standing balance of subjects by using 3 diff erent methods: standing on a force plate with feet width the same as shoulder width (test 1); with feet width the same as half the shoulder width (test 2); with feet width determined by the subject’s comfort (test 3). Subjects underwent each test with their eyes open and closed for 30 seconds each time. Parameters for measuring standing balance included the mean mediolateral and anteroposterior extent, speed, and the velocity moment of center of pressure (COP) movement. Results All parameters showed better results when the subject’s eyes were open rather than closed, and the mean AP extent and speed increased as the age of the subjects increased (p<0.01). However, there was no signifi cant correlation between height and the study parameters, and no differences between men and women. Mean mediolateral extent and speed were signifi cantly longer and faster in test 1 compared with tests 2 and 3 (p<0.01). Th e results of test 2 were better than the results of test 3, but the diff erence was not statistically signifi cant. Conclusion COP movements increased with age and when subjects closed their eyes in an evaluation of quiet standing balance conducted by posturography. Gender and height did not aff ect results of the test. We suggest that an appropriate method for conducting posturography is to have the subject stand on a force plate with their feet width the same as half the shoulder width, because this posture provided relatively accurate balance capacity.
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