Systemic Response

Definition: The systemic response describes the response associated with the body’s functions, such as heart rate, digestion, respiratory rate, etc., which are controlled by the autonomic nervous system. These functions change the volume of blood in tissue and affect hemodynamics globally. As a result, the near-infrared spectroscopy technique is sensitive to the regular fluctuations induced by a systemic response, which should be considered when interpreting optical measurements. Even though some of these functions have distinct frequency signatures, their slow components can overlap with neural and scalp hemodynamics and local vessel dynamics (e.g., vasomotion).Definition: The systemic response describes the response associated with the body’s functions, such as heart rate, digestion, respiratory rate, etc., which are controlled by the autonomic nervous system. These functions change the volume of blood in tissue and affect hemodynamics globally. As a result, the near-infrared spectroscopy technique is sensitive to the regular fluctuations induced by a systemic response, which should be considered when interpreting optical measurements. Even though some of these functions have distinct frequency signatures, their slow components can overlap with neural and scalp hemodynamics and local vessel dynamics (e.g., vasomotion).

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References: https://doi.org/10.1117/1.NPh.9.3.030801

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