I have come across data which states normal postural sway around ankle in degrees, however I have not found a data in centimeter. I have seen people using Lord's sway meter to measure the postural sway and plan therapy based on the data. without having a normative data how is it possible to conclude that the sway measured is abnormal and a treatment for decreasing the sway.
Try Day et al (1993): http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1143881/ and Gatev et al. (1999): http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2269093/. If I remember correctly, they give some measurements in centimeters.
In the early 1980s, I had the opportunity to work with Dr. Anne Shumway-Cook to develop an early postural sway biofeedback device. In the course of our early clinical testing, one of the PTs on the team became pregnant, which posed the question, what happens to postural sway during pregnancy. Because our device was an early prototype, we recruited another female therapist to act as a normal, and measured postural sway each day over 6 months. (Our device measured sway area, and I don't have the absolute numbers any more.)
The really interesting finding was that, in our normal subject, the postural sway varied in a nice sine pattern with a period of 14 days. We were never able to figure out what biological factor would result in a 14 day cycle. I'd love to know.
The reason that this is relevant to your question is that the "normal" value varies over time. If you institute a treatment at the peak of sway, and terminate at the minimum, you will think you have found a significant result, when in fact, it may just be normal variation. Except for grossly abnormal sway, I'd be very cautious about any single-point measure.
I am having some difficulty with your question. Primarily I do not understand why you would want to measure sway around the ankles using a linear scale of distance. If you are thinking of describing the area of stability (primarily in the anterior/posterior plane there is a vast amount of data out there doing just that.
Concerning normality: if your test of balance is unique you will have to define 'normal' using a large enough sample size drawn from a select group of individuals that can be matched with the clinical population. For example, if I was interested in the postural stability of men and women in the Air Force I would draw from that population in sufficient numbers to make a stable comparison set of data (could be as high as 50 or more people). Otherwise there are huge data sets available that define what is normal postural sway under a variety of postural challenges.
Perhaps you could be a little more descriptive in asking your question.
I HAVE USED DATA ON POSTURAL SWAY AS COG VELOCITY (DEG/SEC)..
YOU SEE THE REFERENCE..
Article Effect of chewing on postural stability during quiet standin...
In our lab,we measure body sway using posturography method(BIODEX USA). It has got a reference value as per the age,BMI and gender.However we use normal control for our studies to compare to specificaly use for indian population.
Maybe this manuscript can help You.
http://www.actabio.pwr.wroc.pl/Vol17No2/11.pdf
Thank you all for valuable suggestions.I will post on this topic, after reading all the materials suggested.
- Badges
- Science topic
- Similar topics
- Correction