1. Physical Function in Hip Osteoarthritis: Relationship to Isometric Knee Extensor Steadiness 
Yong-Hao Pua, PhD, Ross A. Clark, PhD, Adam L. Bryant, PhD 
Archives of Physical Medicine and Rehabilitation 
Volume 91, Issue 7, Pages (July 2010)
DOI: /j.apmr
Copyright © 2010 American Congress of Rehabilitation Medicine Terms and Conditions

2. Fig 1
(A) Knee extensor force signals transformed to the time-frequency domain by using wavelet analysis. (B) Time-frequency signals from the 3.9- to 31.2-Hz bandwidth.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2010 American Congress of Rehabilitation Medicine Terms and Conditions

3. Fig 2
(A) Steadiness data that were extracted from the 3.9- to 31.2-Hz bandwidth of the force-time curve. (B) Representative force-time curve from the steadiness trial. Red vertical lines delineate the middle phase of muscle contraction. (C) Morphology of the force-time curve after the steadiness data were extracted.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2010 American Congress of Rehabilitation Medicine Terms and Conditions

4. Fig 3
Interactions between knee extensor steadiness (log transformed) and knee extensor strength for (A) self-paced timed stair test and (B) fast-paced timed stair test. Greater values of knee extensor steadiness indicate greater force fluctuations. High knee extensor strength is defined as 1 SD above the mean knee extensor strength; Low knee extensor strength is defined as 1 SD below the mean knee extensor strength. Abbreviation: B, unstandardized regression coefficient from final hierarchical model.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2010 American Congress of Rehabilitation Medicine Terms and Conditions