منابع مشابه
To dip or not to dip: of arterial pressure physiology, system's analysis, and information.
In real life, arterial pressure is never at complete rest but is continuously in a state of change. Both in humans and animals, arterial pressure rises during emotional arousal, stress, physical exercise, or the fight–flight reaction; conversely it decreases during periods of rest, relaxation, or sleep. There are several critical points in the study of arterial pressure (dys)regulation, particu...
متن کاملTo dip or not to dip: reconciling optical imaging and fMRI data.
Several optical studies have reported a brief initial increase of deoxyhemoglobin (1), which is consistent with an initial dip observed in the functional MRI (fMRI) signal, evoked by local neuronal activity. This effect is small and not always present (2), but it has stirred great interest because it may reflect a rapid increase of oxidative metabolism before increases in blood flow and, thus, ...
متن کاملTo dip or not to dip: on the physiology of blood pressure decrease during nocturnal sleep in healthy humans.
That sleep is accompanied by a blood pressure decrease is well known; however, the underlying physiology deserves further investigation. The present study examines in healthy subjects 2 main questions: is this dipping actively evoked? and what are the consequences of nondipping for daytime blood pressure? Nocturnal blood pressure was extrinsically elevated in 12 sleeping subjects to mean daytim...
متن کاملA classification study of clinical subsets in an inception cohort of early psoriatic peripheral arthritis--'DIP or not DIP revisited'.
INTRODUCTION Multiple psoriatic arthritis (PsA) classification criteria exist, but these are based on established PsA when pre-existing joint damage and the effect of medication may confound their validity. This study examined the application of the Veale classification criteria in early PsA to determine the effect of disease progression and treatment on classification and to determine the effe...
متن کاملTransformation to dip-dependent Common Image Gathers
We introduce a new transform of offset-domain Common Image Gathers (CIGs) obtained by wavefield-continuation migration methods. This transformation can be applied to either horizontal-offset CIGs or vertical-offset CIGs. It overcomes the limitations that both kinds of CIGs suffer in the presence of a wide range of reflectors’ dips. The result of our transformation is an image cube that is equiv...
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ژورنال
عنوان ژورنال: Hypertension
سال: 2007
ISSN: 0194-911X,1524-4563
DOI: 10.1161/hypertensionaha.106.085753