Reproducibility of Loading Measurements With Skin-Mounted Accelerometers During Walking Tuomas Liikavainio, MD, MSc, Timo Bragge, Marko Hakkarainen,

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Reproducibility of Loading Measurements With Skin-Mounted Accelerometers During Walking Tuomas Liikavainio, MD, MSc, Timo Bragge, Marko Hakkarainen, MSc, Jukka S. Jurvelin, PhD, Pasi A. Karjalainen, PhD, Jari P. Arokoski, MD, DMSc Archives of Physical Medicine and Rehabilitation Volume 88, Issue 7, Pages 907-915 (July 2007) DOI: 10.1016/j.apmr.2007.03.031 Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 1 Gait parameters defined from contact phase of vertical (Fz) ground reaction force (upper figure) and of az acceleration signals (lower). The initial parts of the signals are on an expanded scale on the right demonstrating the definitions of the rate of loading parameters. The ground reaction force of a left limb is demonstrated as a grey line in the upper left figure. Abbreviation: BW, body weight. Archives of Physical Medicine and Rehabilitation 2007 88, 907-915DOI: (10.1016/j.apmr.2007.03.031) Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 2 Gait parameters defined from contact phase of AP (Fx) and ML (Fy) ground reaction forces. Archives of Physical Medicine and Rehabilitation 2007 88, 907-915DOI: (10.1016/j.apmr.2007.03.031) Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 3 Linear correlations between loading parameters of vertical (Fz) ground reaction force and az and ar accelerations during walking with normal speed. (A) Fz1 max and IPAa1z; (B) maximal loading rate (LRmax) and ATRmax a1z; (C) average loading rate (LRave) and ATRave a1z; (D) maximal loading rate and ATRave a1z; (E) maximal loading rate and IPAa1z; and (F) LRmax and IPAa1r. Acceleration was measured with the SMAs attached below the knee. Archives of Physical Medicine and Rehabilitation 2007 88, 907-915DOI: (10.1016/j.apmr.2007.03.031) Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions