caa a22 4500 445352647 CHVBK 20180317142849.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s00221-011-2889-3 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2889-3 Determining posture from physiological tremor [Elektronische Daten] [Mark Albert, Konrad Kording] The measurement of body and limb posture is important to many clinical and research studies. Current approaches either directly measure posture (e.g., using optical or magnetic methods) or more indirectly measure it by integrating changes over time (e.g., using gyroscopes and/or accelerometers). Here, we introduce a way of estimating posture from movements without requiring integration over time and the resulting complications. We show how the almost imperceptible tremor of the hand is affected by posture in an intuitive way and therefore can be used to estimate the posture of the arm. We recorded postures and tremor of the arms of volunteers. By using only the minor axis in the covariance of hand tremor, we could estimate the angle of the forearm with a standard deviation of about 4° when the subject's elbow is resting on a table and about 10° when it is off the table. This technique can also be applied as a post hoc analysis on other hand-position data sets to extract posture. This new method allows the estimation of body posture from tremor, is complementary to other techniques, and so can become a useful tool for future research and clinical applications. Springer-Verlag, 2011 Physiological tremor nationallicence Posture nationallicence Motion tracking nationallicence Albert Mark Department of Physical Medicine and Rehabilitation, Rehabilitation Institute of Chicago, Northwestern University, 345 E Superior St., Room 1479, 60611, Chicago, IL, USA aut Kording Konrad Department of Physical Medicine and Rehabilitation, Rehabilitation Institute of Chicago, Northwestern University, 345 E Superior St., Room 1479, 60611, Chicago, IL, USA aut Experimental Brain Research Springer-Verlag 215/3-4(2011-12-01), 247-255 0014-4819 215:3-4<247 2011 215 221 https://doi.org/10.1007/s00221-011-2889-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2889-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Albert Mark Department of Physical Medicine and Rehabilitation, Rehabilitation Institute of Chicago, Northwestern University, 345 E Superior St., Room 1479, 60611, Chicago, IL, USA aut NATIONALLICENCE 700 1- Kording Konrad Department of Physical Medicine and Rehabilitation, Rehabilitation Institute of Chicago, Northwestern University, 345 E Superior St., Room 1479, 60611, Chicago, IL, USA aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 215/3-4(2011-12-01), 247-255 0014-4819 215:3-4<247 2011 215 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer