Cerebral and muscle oxygen saturation measurement by a frequency-domain near-infrared spectroscopic technique

1995 ◽  
Author(s):  
Marco Ferrari ◽  
Roberto A. De Blasi ◽  
Sergio Fantini ◽  
Maria-Angela Franceschini ◽  
Beniamino B. Barbieri ◽  
...  
Keyword(s):  
Oxygen Saturation ◽  
Frequency Domain ◽  
Near Infrared ◽  
Spectroscopic Technique ◽  
Muscle Oxygen ◽  
Infrared Spectroscopic ◽  
Saturation Measurement

scholarly journals Cerebral and muscle oxygen saturation measurement by frequency-domain near-infra-red spectrometer

1995 ◽  
Vol 33 (2) ◽  
pp. 228-230 ◽  
Author(s):  
R. A. De Blasi ◽  
S. Fantini ◽  
M. A. Franceschini ◽  
M. Ferrari ◽  
E. Gratton
Keyword(s):  
Oxygen Saturation ◽  
Frequency Domain ◽  
Muscle Oxygen ◽  
Infra Red ◽  
Saturation Measurement

Effect of Climbing Speed on Pulmonary Oxygen Uptake and Muscle Oxygen Saturation Dynamics in the Finger Flexors

2021 ◽  
pp. 1-9
Author(s):  
Jan Gajdošík ◽  
Jirˇí Baláš ◽  
Dominika Krupková ◽  
Lukáš Psohlavec ◽  
Nick Draper
Keyword(s):  
Oxygen Uptake ◽  
Oxygen Saturation ◽  
Near Infrared ◽  
Cellular Level ◽  
Gas Analysis ◽  
Whole Body ◽  
Flexor Digitorum Profundus ◽  
Muscle Oxygen ◽  
Sport Climbing ◽  
Body Activity

Purpose: Although sport climbing is a self-paced whole-body activity, speed varies with climbing style, and the effect of this on systemic and localized oxygen responses is not well understood. Therefore, the aim of the present study was to determine muscle and pulmonary oxygen responses during submaximal climbing at differing speeds of ascent. Methods: Thirty-two intermediate and advanced sport climbers completed three 4-minute-long ascents of the same route at 4, 6, and 9 m·min−1 on a motorized climbing ergometer (treadwall) on separate laboratory visits. Gas analysis and near-infrared spectroscopy were used to determine systemic oxygen uptake () and muscle oxygen saturation (StO2) of the flexor digitorum profundus. Results: Increases in ascent speed of 1 m·min−1 led to increases of by 2.4 mL·kg−1·min−1 (95% CI, 2.1 to 2.8 mL·kg−1·min−1) and decreases in StO2 by −1.3% (95% CI, 1.9% to −0.7%). There was a significant interaction of climbing ability and speed for StO2 (P < .001, ). The results revealed that the decrease of StO2 was present for intermediate but not advanced climbers. Conclusions: In this study, the results suggest that demand during climbing was largely determined by climbing speed; however, the ability level of the climber appeared to mitigate StO2 at a cellular level. Coaches and instructors may prescribe climbing ascents with elevated speed to improve generalized cardiorespiratory fitness. To stimulate localized aerobic capacity, however, climbers should perhaps increase the intensity of training ascents through the manipulation of wall angle or reduction of hold size.

scholarly journals Quantitative measurement of muscle oxygen saturation without influence from skin and fat using continuous-wave near infrared spectroscopy

2007 ◽  
Vol 15 (21) ◽  
pp. 13715 ◽  
Author(s):  
Ye Yang ◽  
Olusola Soyemi ◽  
Peter J. Scott ◽  
Michelle R. Landry ◽  
Stuart M. Lee ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Oxygen Saturation ◽  
Near Infrared Spectroscopy ◽  
Quantitative Measurement ◽  
Near Infrared ◽  
Continuous Wave ◽  
Muscle Oxygen

scholarly journals Interpretation of Near-Infrared Spectroscopy (NIRS) Signals in Skeletal Muscle

2019 ◽  
Author(s):  
Adeola A. Sanni ◽  
Kevin K. McCully
Keyword(s):  
Skeletal Muscle ◽  
Oxygen Saturation ◽  
Blood Volume ◽  
Near Infrared ◽  
Continuous Wave ◽  
Muscle Oxygen ◽  
Significant Difference ◽  
Forearm Flexor Muscles ◽  
The Difference ◽  
Forearm Flexor

NIRS uses the relative absorption of light at 850nm and 760nm, to determine skeletal muscle oxygen saturation. Previous studies have used the ratio of both signals to report muscle oxygen saturation. Purpose: To evaluate the different approaches used to represent muscle oxygen saturation, and to evaluate the pulsations of the O2heme and Heme signal. Method: Twelve participants, ages 20-29years were tested on the forearm flexor muscles using continuous wave NIRS at rest. Measurements were taken during 2-3mins rest, during physiological calibration (5-minuts Ischemia) and during reperfusion.&nbsp; Results: There was a significant difference in pulse size between O2heme and Heme signal at the three locations (p &lt; 0.05). Resting oxygen saturation was 58.8+9.2%, 69.6+3.9%, and 89.2+6.9% when calibrated using O2heme, TSI, and Heme, respectively.&nbsp; Conclusion: The difference in magnitude of O2heme and Heme pulse with each heartbeat might suggest different anatomical locations of these signals, which propose calibrating with just one of the signals instead of the ratio of both. Calculations of physiological calibration must account for increased blood volume in the tissue, because of the changes in blood volume which appear to be primarily from the O2heme signal. Resting oxygen levels calibrated with Heme agrees with theoretical oxygen saturation.

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