David M. Brienza, PhD, Mary Jo Geyer, PhD, PT, Yih-Kuen Jan, PhD, PT

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A Comparison of Changes in Rhythms of Sacral Skin Blood Flow in Response to Heating and Indentation David M. Brienza, PhD, Mary Jo Geyer, PhD, PT, Yih-Kuen Jan, PhD, PT Archives of Physical Medicine and Rehabilitation Volume 86, Issue 6, Pages 1245-1251 (June 2005) DOI: 10.1016/j.apmr.2004.11.038 Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 1 Structure and block diagram of the computer-controlled system with locations of probes. Abbreviations: DAQ, data acquisition; OP-AMP, operational amplifier; PCs, personal computers. Archives of Physical Medicine and Rehabilitation 2005 86, 1245-1251DOI: (10.1016/j.apmr.2004.11.038) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 2 Mean blood flow under incremental loading (0–60mmHg at 5-mmHg step/3min). Values are mean ± standard error (SE). Archives of Physical Medicine and Rehabilitation 2005 86, 1245-1251DOI: (10.1016/j.apmr.2004.11.038) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 3 Comparisons of power of 5 characteristic frequencies of baseline and recovery periods Values are mean ± SE. *P<.05. Archives of Physical Medicine and Rehabilitation 2005 86, 1245-1251DOI: (10.1016/j.apmr.2004.11.038) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 4 Power of metabolic frequency under incremental pressure. Values are mean ± SE. Archives of Physical Medicine and Rehabilitation 2005 86, 1245-1251DOI: (10.1016/j.apmr.2004.11.038) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 5 Power of neurogenic frequency under incremental pressure. Values are mean ± SE. Archives of Physical Medicine and Rehabilitation 2005 86, 1245-1251DOI: (10.1016/j.apmr.2004.11.038) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 6 Power of myogenic frequency under incremental pressure. Values are mean ± SE. Archives of Physical Medicine and Rehabilitation 2005 86, 1245-1251DOI: (10.1016/j.apmr.2004.11.038) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 7 Comparisons of 5 characteristic frequency bands between postheating and postloading. *P<.01. Archives of Physical Medicine and Rehabilitation 2005 86, 1245-1251DOI: (10.1016/j.apmr.2004.11.038) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions