Near-infrared spectroscopy in chronic progressive external ophthalmoplegia: Adipose tissue thickness confounds decreased muscle oxygen consumption

2002 ◽  
Vol 51 (2) ◽  
pp. 272-273 ◽  
Author(s):  
Mireille C. P. van Beekvelt ◽  
Baziel G. M. van Engelen ◽  
Ron A. Wevers ◽  
Willy N. J. M. Colier
Keyword(s):  
Adipose Tissue ◽  
Oxygen Consumption ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Progressive External Ophthalmoplegia ◽  
Chronic Progressive External Ophthalmoplegia ◽  
Tissue Thickness ◽  
Muscle Oxygen ◽  
Muscle Oxygen Consumption

Food Intake Increases Resting Muscle Oxygen Consumption As Measured By Near-infrared Spectroscopy

2002 ◽  
Vol 2 (6) ◽  
pp. 1-9 ◽  
Author(s):  
Chihoko Ueda ◽  
Takafumi Hamaoka ◽  
Norio Murase ◽  
Takayuki Sako ◽  
Motohide Murakami ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Infrared Spectroscopy ◽  
Food Intake ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Muscle Oxygen ◽  
Muscle Oxygen Consumption ◽  
Resting Muscle

A comparison of exercise type and intensity on the noninvasive assessment of skeletal muscle mitochondrial function using near-infrared spectroscopy

2013 ◽  
Vol 114 (2) ◽  
pp. 230-237 ◽  
Author(s):  
Terence E. Ryan ◽  
Jared T. Brizendine ◽  
Kevin K. McCully
Keyword(s):  
Skeletal Muscle ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Mitochondrial Function ◽  
Rate Constants ◽  
Near Infrared ◽  
Clinical Settings ◽  
Muscle Oxygen ◽  
Muscle Oxygen Consumption ◽  
Intensity Of Exercise

Near-infrared spectroscopy (NIRS) can be used to measure muscle oxygen consumption (mVO2) using arterial occlusions. The recovery rate of mVO2after exercise can provide an index of skeletal muscle mitochondrial function. The purpose of this study was to test the influence of exercise modality and intensity on NIRS measurements of mitochondrial function. Three experiments were performed. Thirty subjects (age: 18–27 yr) were tested. NIRS signals were corrected for blood volume changes. The recovery of mVO2after exercise was fit to a monoexponential curve, and a rate constant was calculated (directly related to mitochondrial function). No differences were found in NIRS rate constants for VOL and ES exercises (2.04 ± 0.57 vs. 2.01 ± 0.59 min−1for VOL and ES, respectively; P = 0.317). NIRS rate constants were independent of the contraction frequency for both VOL and ES (VOL: P = 0.166 and ES: P = 0.780). ES current intensity resulted in significant changes to the normalized time-tension integral (54 ± 11, 82 ± 7, and 100 ± 0% for low, medium, and high currents, respectively; P < 0.001) but did not influence NIRS rate constants (2.02 ± 0.54, 1.95 ± 0.44, 2.02 ± 0.46 min−1for low, medium, and high currents, respectively; P = 0.771). In summary, NIRS measurements of skeletal muscle mitochondrial function can be compared between VOL and ES exercises and were independent of the intensity of exercise. NIRS represents an important new technique that is practical for testing in research and clinical settings.

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