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Figure 1. Example of changes of skin perfusion, beat-to-beat interval of heart rate (R-R), and heart rate variability (HRV) during postural changes. Skin perfusion shows increase in prone posture in (a) nondisabled control, but not in (b) person with SCI. R-R intervals show increase in (c) nondisabled control, but not in (d) person with SCI. Spectral analysis reveals increase in power of low frequency of HRV in prone posture in (e) nondisabled control, but not in (f) person with SCI. PSD = power spectrum density. Jan YK, Anderson M, Soltani J, Burns S, Foreman RD. Comparison of changes in heart rate variability and sacral skin perfusion in response to postural changes in people with spinal cord injury. J Rehabil Res Dev. 2013;50(2): 203–14.http://dx.doi.org/10.1682/JRRD.2011.08.0138