Abstract
Introduction: Heart rate variability (HRV) describes the cyclic changes of the heart period (R–R interval) over time. Analysis of HRV in the frequency domain delineates parasympathetic from sympathetic components of the ANS, and may also provide information about baroreflex function. High frequency (HF) components (0.15 to 0.4Hz) are an index of parasympathetic neural activity. Low frequency (LF) components (0.04 to 0.15Hz) are an index of sympathetic neural activity. We examined changes in HRV as well as symptoms of orthostatic hypotension (OH) during an orthostatic challenge in tetraplegic rugby players to examine changes in autonomic function and symptoms of OH in persons with cervical complete (CC) and cervical incomplete (CI) SCI.
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