Mathematical Model for the Hemodynamic Response to Venous Occlusion Measured With Near-Infrared Spectroscopy in the Human Forearm

2007 ◽  
Vol 54 (4) ◽  
pp. 573-584 ◽  
Author(s):  
Toi Van Vo ◽  
Peter E. Hammer ◽  
Matthew L. Hoimes ◽  
Shalini Nadgir ◽  
Sergio Fantini
Keyword(s):  
Mathematical Model ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Hemodynamic Response ◽  
Venous Occlusion ◽  
Human Forearm

Cortical Hemodynamic Response Associated with Spatial Coding: A Near-Infrared Spectroscopy Study

2021 ◽  
Vol 34 (2) ◽  
pp. 207-220
Author(s):  
Abiot Y. Derbie ◽  
Bolton Chau ◽  
Bess Lam ◽  
Yun-hua Fang ◽  
Kin-Hung Ting ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Hemodynamic Response ◽  
Spectroscopy Study ◽  
Spatial Coding

Noninvasive measurement of forearm blood flow and oxygen consumption by near-infrared spectroscopy

1994 ◽  
Vol 76 (3) ◽  
pp. 1388-1393 ◽  
Author(s):  
R. A. De Blasi ◽  
M. Ferrari ◽  
A. Natali ◽  
G. Conti ◽  
A. Mega ◽  
...  
Keyword(s):  
Blood Flow ◽  
Oxygen Consumption ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Healthy Subjects ◽  
Near Infrared ◽  
Forearm Blood Flow ◽  
Vascular Occlusion ◽  
Venous Occlusion ◽  
The Subject

We applied near-infrared spectroscopy (NIRS) for the simultaneous measurement of forearm blood flow (FBF) and oxygen consumption (VO2) in the human by inducing a 50-mmHg venous occlusion. Eleven healthy subjects were studied both at rest and after hand exercise during vascular occlusion. FBF was also measured by strain-gauge plethysmography. FBF measured by NIRS was 1.9 +/- 0.8 ml.100 ml-1.min-1 at rest and 8.2 +/- 2.9 ml.100 ml-1.min-1 after hand exercise. These values showed a correlation (r = 0.94) with those obtained by the plethysmography. VO2 values were 4.6 +/- 1.3 microM O2 x 100 ml-1.min-1 at rest and 24.9 +/- 11.2 microM O2 x 100 ml-1.min-1 after hand exercise. The scatter of the FBF and VO2 values showed a good correlation between the two variables (r = 0.93). The results demonstrate that NIRS provides the particular advantage of obtaining the contemporary evaluation of blood flow and VO2, allowing correlation of these two variables by a single maneuver without discomfort for the subject.

scholarly journals Evoked Hemodynamic Response Estimation to Auditory Stimulus Using Recursive Least Squares Adaptive Filtering with Multidistance Measurement of Near-Infrared Spectroscopy

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Yan Zhang ◽  
Xin Liu ◽  
Dan Liu ◽  
Chunling Yang ◽  
Qisong Wang ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Least Squares ◽  
Auditory Stimulus ◽  
Near Infrared Spectroscopy ◽  
Adaptive Filtering ◽  
Near Infrared ◽  
Continuous Wave ◽  
Hemodynamic Response ◽  
Recursive Least Squares ◽  
Functional Near Infrared Spectroscopy

The performance of functional near-infrared spectroscopy (fNIRS) is sometimes degraded by the interference caused by the physical or the systemic physiological activities. Several interferences presented during fNIRS recordings are mainly induced by cardiac pulse, breathing, and spontaneous physiological low-frequency oscillations. In previous work, we introduced a multidistance measurement to reduce physiological interference based on recursive least squares (RLS) adaptive filtering. Monte Carlo simulations have been implemented to evaluate the performance of RLS adaptive filtering. However, its suitability and performance on human data still remain to be evaluated. Here, we address the issue of how to detect evoked hemodynamic response to auditory stimulus using RLS adaptive filtering method. A multidistance probe based on continuous wave fNIRS is devised to achieve the fNIRS measurement and further study the brain functional activation. This study verifies our previous findings that RLS adaptive filtering is an effective method to suppress global interference and also provides a practical way for real-time detecting brain activity based on multidistance measurement.

Evoked hemodynamic response of the auditory cortex measured by magnetoencephalography and near‐infrared spectroscopy

1996 ◽  
Vol 100 (4) ◽  
pp. 2630-2630
Author(s):  
Michihiro Ohnishi ◽  
Shinobu Masaki ◽  
Kiyoshi Honda ◽  
Naoki Kusakawa ◽  
Noboru Hayashi ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Auditory Cortex ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Hemodynamic Response

Sex differences in prefrontal hemodynamic response to mental arithmetic as assessed by near-infrared spectroscopy

2009 ◽  
Vol 6 (4) ◽  
pp. 565-574 ◽  
Author(s):  
Hongyu Yang ◽  
Ying Wang ◽  
Zhenyu Zhou ◽  
Hui Gong ◽  
Qingming Luo ◽  
...  
Keyword(s):  
Sex Differences ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Mental Arithmetic ◽  
Hemodynamic Response
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