Influence of skin blood flow and source-detector distance on near-infrared spectroscopy-determined cerebral oxygenation in humans

2014 ◽  
Vol 35 (3) ◽  
pp. 237-244 ◽  
Author(s):  
Ai Hirasawa ◽  
Shintaro Yanagisawa ◽  
Naoki Tanaka ◽  
Tsukasa Funane ◽  
Masashi Kiguchi ◽  
...  
Keyword(s):  
Blood Flow ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Skin Blood Flow ◽  
Near Infrared ◽  
Cerebral Oxygenation ◽  
Detector Distance

Near-infrared spectroscopy determined cerebral oxygenation with eliminated skin blood flow in young males

2015 ◽  
Vol 30 (2) ◽  
pp. 243-250 ◽  
Author(s):  
Ai Hirasawa ◽  
Takahito Kaneko ◽  
Naoki Tanaka ◽  
Tsukasa Funane ◽  
Masashi Kiguchi ◽  
...  
Keyword(s):  
Blood Flow ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Skin Blood Flow ◽  
Near Infrared ◽  
Cerebral Oxygenation ◽  
Young Males

Skin blood flow influences cerebral oxygenation measured by near-infrared spectroscopy during dynamic exercise

2013 ◽  
Vol 113 (11) ◽  
pp. 2841-2848 ◽  
Author(s):  
Taiki Miyazawa ◽  
Masahiro Horiuchi ◽  
Hidehiko Komine ◽  
Jun Sugawara ◽  
Paul J. Fadel ◽  
...  
Keyword(s):  
Blood Flow ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Skin Blood Flow ◽  
Near Infrared ◽  
Cerebral Oxygenation ◽  
Dynamic Exercise

Skin Blood Flow Affects In Vivo Near-Infrared Spectroscopy Measurements in Human Skeletal Muscle

2005 ◽  
Vol 55 (4) ◽  
pp. 241-244 ◽  
Author(s):  
Michael J. Buono ◽  
Paul W. Miller ◽  
Clifford Hom ◽  
Robert S. Pozos ◽  
Fred W. Kolkhorst
Keyword(s):  
Skeletal Muscle ◽  
Blood Flow ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Skin Blood Flow ◽  
Human Skeletal Muscle ◽  
Near Infrared

Reduction of the skin blood flow artifact from near-infrared spectroscopy signals

2011 ◽  
Vol 71 ◽  
pp. e306
Author(s):  
Takanori Sato ◽  
Kotaro Takeda ◽  
Okito Yamashita ◽  
Yoshihiro Inoue ◽  
Yohei Otaka ◽  
...  
Keyword(s):  
Blood Flow ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Skin Blood Flow ◽  
Near Infrared ◽  
Flow Artifact

scholarly journals Changes in cerebral oxygen saturation and cerebral blood flow velocity under mild +Gz hypergravity

2019 ◽  
Vol 127 (1) ◽  
pp. 190-197 ◽  
Author(s):  
Toru Konishi ◽  
Takuya Kurazumi ◽  
Tomokazu Kato ◽  
Chiharu Takko ◽  
Yojiro Ogawa ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Infrared Spectroscopy ◽  
Oxygen Saturation ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Cerebral Oxygenation ◽  
Cerebral Oxygen Saturation ◽  
Cerebral Oxygen ◽  
Regional Cerebral Oxygen Saturation

We previously reported that cerebral blood flow (CBF) was reduced by even mild +Gz hypergravity. Regional cerebral oxygen saturation as measured by near-infrared spectroscopy (C-rSO2) has been widely used to detect cerebral ischemia in clinical practice. For example, decreases in C-rSO2reflect reduced CBF or arterial oxygen saturation. Thus it was hypothesized that C-rSO2would decrease in association with reduced CBF during mild hypergravity. To test this hypothesis, we measured CBF velocity by transcranial Doppler ultrasonography and C-rSO2during mild +Gz hypergravity while participants were in a sitting position. Among 17 male participants, 15 completed 21 min of exposure to +1.5 Gz generated by short-arm centrifuge. C-rSO2and mean CBF velocity in the middle cerebral artery (MCBFVMCA) during centrifugation were averaged every 5 min and compared with pre-hypergravity (+1.0 Gz). C-rSO2did not change significantly throughout centrifugation, although MCBFVMCAgradually decreased from the beginning (−1.2% at 0–5 min), and significantly decreased at 5–10 min (−4.8%), 10–15 min (−6.7%), and 15–20 min (−7.4%). Contrary to our hypothesis, decreases in C-rSO2were not detected, despite reductions in CBF velocity during hypergravity. Since some assumptions, such as unaltered arteriovenous volume ratio, hemoglobin concentration, extracranial blood flow, and brain activity, need to be satisfied to monitor cerebral ischemia by C-rSO2, the present results suggest that these necessary assumptions for near-infrared spectroscopy are not always applicable, and that cerebral oxygenation may not precisely reflect decreases in CBF under mild +Gz hypergravity.NEW & NOTEWORTHY To our knowledge, this is the first study to evaluate simultaneously cerebral oxygenation monitored by near-infrared spectroscopy and cerebral blood flow (CBF) monitored by transcranial Doppler under +1.5 Gz hypergravity. Contrary to our hypothesis, there was no significant correlation between CBF velocity and regional cerebral oxygen saturation (C-rSO2). However, an incomplete case nearly involving syncope suggests the possibility that C-rSO2can detect a remarkable decrease in CBF with development of presyncope during +Gz hypergravity.

Influence of skin blood flow on near-infrared spectroscopy signals measured on the forehead during a verbal fluency task

NeuroImage ◽  
2011 ◽  
Vol 57 (3) ◽  
pp. 991-1002 ◽  
Author(s):  
Toshimitsu Takahashi ◽  
Yoriko Takikawa ◽  
Reiko Kawagoe ◽  
Satoshi Shibuya ◽  
Takayuki Iwano ◽  
...  
Keyword(s):  
Blood Flow ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Skin Blood Flow ◽  
Verbal Fluency ◽  
Near Infrared ◽  
Verbal Fluency Task ◽  
Fluency Task
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