Comparison of two methods of measuring forearm oxygen consumption (VO2) by near infrared spectroscopy

Blasi, R. A. De; Almenräder, Nicole; Aurisicchio, Patrizia; Ferrari, Marco

doi:10.1117/12.269893

Cited by 45 publications

(68 citation statements)

References 23 publications

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“…The rate of increase in HHb, or the decrease rate of HbO2, measured by NIRS during venous or total occlusions have been used as indicators of oxygen consumption [27], [28], [49]. Therefore, the values in Table II may be used as comparative indicators of oxygen consumption.…”

Section: B Hemoglobin Concentrationsmentioning

confidence: 99%

Reflectance Photoplethysmography as Noninvasive Monitoring of Tissue Blood Perfusion

Abay

Kyriacou

2015

IEEE Trans. Biomed. Eng.

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Section: B Hemoglobin Concentrationsmentioning

confidence: 99%

Reflectance Photoplethysmography as Noninvasive Monitoring of Tissue Blood Perfusion

Abay

Kyriacou

2015

IEEE Trans. Biomed. Eng.

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“…The pressure was maintained at a constant level for 30 seconds and then quickly released. The absolute value of rmVO 2 was calculated by analyzing the rate of increase in [HHb] ensuing venous occlusion [18] . The concentration changes of HHb were converted from micromolar per second (μM/s) into milliliters of O 2 per 100 grams of tissue per minute (ml/100 g/min).…”

Section: Nirs-based Measurementsmentioning

confidence: 99%

The Role of Deconditioning in the End-Stage Renal Disease Myopathy: Physical Exercise Improves Altered Resting Muscle Oxygen Consumption

Manfredini

Lamberti²,

Malagoni³

et al. 2015

Am J Nephrol

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Background: Skeletal muscle dysfunction and poor exercise tolerance are hallmarks of end-stage renal disease (ESRD). Noninvasively measured (near-infrared spectroscopy, NIRS) resting muscle oxygen consumption (rmVO₂) is a biomarker of muscle dysfunction, which can be applied to study the severity and the reversibility of ESRD myopathy. We tested the hypothesis that deconditioning is a relevant factor in ESRD myopathy. Methods: The whole dialysis population (n = 59) of two of the eight centers participating into the EXCITE study (ClinicalTrials.gov NCT01255969), a randomized trial evaluating the effect of a home-based exercise program on the functional capacity of these patients was studied. Thirty-one patients were in the active arm (exercise group) and 28 in the control arm (no intervention). Normative data for rmVO₂ were obtained from a group of 19 healthy subjects. Results: rmVO₂ was twice higher (p < 0.001) in ESRDs patients (0.083 ± 0.034 ml/100 g/min) than in healthy subjects (0.041 ± 0.020 ml/100 g/min) indicating substantial skeletal muscle dysfunction in ESRD. rmVO₂ correlated with resting heart rate (r = 0.34, p = 0.009) but was independent of age, dialysis vintage, biochemical, vascular and nutrition parameters. After the 6-month exercise program, rmVO₂ reduced to 0.064 ± 0.024 ml/100 g/min (-23%, p < 0.001) in the exercise group indicating that skeletal muscle dysfunction is largely reversible but remained identical in the control group (0.082 ± 0.032 to 0.082 ± 0.031 ml/100 g/min). Conclusion: Deconditioning has a major role in ESRD myopathy. rmVO₂ is a marker of physical deconditioning and has the potential for monitoring re-conditioning programs based on physical exercise in the ESRD population.

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“…Near-infrared spectroscopy ͑NIRS͒ can be used to measure local blood flow and oxygen consumption, noninvasively, and in situ. NIRS measures tissue blood flow using different protocols such as the modulation of the fraction of inspired oxygen (FiO 2 ), 4 the venous occlusion, [4][5][6][7] and the tilting table. [8][9][10][11] These protocols are noninvasive, cause no discomfort, and allow simultaneous measurements of local blood flow and oxygen consumption in skeletal muscles.…”

Section: Introductionmentioning

confidence: 99%

Blood flow and oxygen consumption with near-infrared spectroscopy and venous occlusion: spatial maps and the effect of time and pressure of inflation

et al. 2000

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Abstract. We have measured the local blood flow (BF) and oxygen consumption (OC) in the human calf muscle using near-infrared spectroscopy during venous occlusion. Venous occlusion was achieved by inflating a pneumatic cuff around the thigh of the subject. We have investigated the influence of the inflation time and cuff pressure on the recovered values of BF and OC. We have found that if the cuff pressure is increased from a threshold pressure (ϳ30 mm Hg) to a critical pressure (ϳ45 mm Hg) in less than about 6 s, one measures the same values of BF and OC independent of the total inflation time and final cuff pressure. We also report nine-pixel spatial maps of BF and OC to show that this technique can lead to spatially resolved measurements of blood flow and oxygen consumption in tissues.

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Comparison of two methods of measuring forearm oxygen consumption (VO2) by near infrared spectroscopy

Cited by 45 publications

References 23 publications

Reflectance Photoplethysmography as Noninvasive Monitoring of Tissue Blood Perfusion

Reflectance Photoplethysmography as Noninvasive Monitoring of Tissue Blood Perfusion

The Role of Deconditioning in the End-Stage Renal Disease Myopathy: Physical Exercise Improves Altered Resting Muscle Oxygen Consumption

Blood flow and oxygen consumption with near-infrared spectroscopy and venous occlusion: spatial maps and the effect of time and pressure of inflation

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