scholarly journals Early Occurrence of Respiratory Muscle Deoxygenation Assessed by Near-Infrared Spectroscopy During Leg Exercise in Patients With Chronic Heart Failure

1999 ◽  
Vol 63 (2) ◽  
pp. 97-103 ◽  
Author(s):  
Setsuo Terakado ◽  
Toru Takeuchi ◽  
Takeshi Miura ◽  
Hiroshi Sato ◽  
Naoko Nishioka ◽  
...  
Keyword(s):  
Heart Failure ◽  
Infrared Spectroscopy ◽  
Chronic Heart Failure ◽  
Near Infrared Spectroscopy ◽  
Respiratory Muscle ◽  
Near Infrared ◽  
Muscle Deoxygenation ◽  
Leg Exercise ◽  
Early Occurrence

Kinetics of muscle deoxygenation and microvascular Po2 during contractions in rat: comparison of optical spectroscopy and phosphorescence-quenching techniques

2012 ◽  
Vol 112 (1) ◽  
pp. 26-32 ◽  
Author(s):  
Shunsaku Koga ◽  
Yutaka Kano ◽  
Thomas J. Barstow ◽  
Leonardo F. Ferreira ◽  
Etsuko Ohmae ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Visible Light ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Fiber Type ◽  
Type I ◽  
Phosphorescence Quenching ◽  
Mean Response Time ◽  
Muscle Deoxygenation ◽  
Visible Light Spectroscopy

The overarching presumption with near-infrared spectroscopy measurement of muscle deoxygenation is that the signal reflects predominantly the intramuscular microcirculatory compartment rather than intramyocyte myoglobin (Mb). To test this hypothesis, we compared the kinetics profile of muscle deoxygenation using visible light spectroscopy (suitable for the superficial fiber layers) with that for microvascular O2 partial pressure (i.e., PmvO2, phosphorescence quenching) within the same muscle region (0.5∼1 mm depth) during transitions from rest to electrically stimulated contractions in the gastrocnemius of male Wistar rats ( n = 14). Both responses could be modeled by a time delay (TD), followed by a close-to-exponential change to the new steady level. However, the TD for the muscle deoxygenation profile was significantly longer compared with that for the phosphorescence-quenching PmvO2 [8.6 ± 1.4 and 2.7 ± 0.6 s (means ± SE) for the deoxygenation and PmvO2, respectively; P < 0.05]. The time constants (τ) of the responses were not different (8.8 ± 4.7 and 11.2 ± 1.8 s for the deoxygenation and PmvO2, respectively). These disparate (TD) responses suggest that the deoxygenation characteristics of Mb extend the TD, thereby increasing the duration (number of contractions) before the onset of muscle deoxygenation. However, this effect was insufficient to increase the mean response time. Somewhat differently, the muscle deoxygenation response measured using near-infrared spectroscopy in the deeper regions (∼5 mm depth) (∼50% type I Mb-rich, highly oxidative fibers) was slower (τ = 42.3 ± 6.6 s; P < 0.05) than the corresponding value for superficial muscle measured using visible light spectroscopy or PmvO2 and can be explained on the basis of known fiber-type differences in PmvO2 kinetics. These data suggest that, within the superficial and also deeper muscle regions, the τ of the deoxygenation signal may represent a useful index of local O2 extraction kinetics during exercise transients.

scholarly journals Relationship Between Muscle Deoxygenation And Workload At Peak Exercise In Healthy Adults Using Near-infrared Spectroscopy

2019 ◽  
Vol 51 (Supplement) ◽  
pp. 300
Author(s):  
Ashley M. Goodwin ◽  
Jacqueline Montes ◽  
Ipek Ensari ◽  
Feliz Marie Hernandez ◽  
Kayla Coutts ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Healthy Adults ◽  
Peak Exercise ◽  
Muscle Deoxygenation

Ventilatory and Near-Infrared Spectroscopy Responses Similarly Determine Anaerobic Threshold in Patients With Heart Failure

2020 ◽  
Vol 40 (2) ◽  
pp. E18-E21 ◽  
Author(s):  
Michel Silva Reis ◽  
Igor Nasser ◽  
Adriano Barroco ◽  
Danilo Cortozi Berton ◽  
José Alberto Neder ◽  
...  
Keyword(s):  
Heart Failure ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Anaerobic Threshold ◽  
Near Infrared ◽  
Patients With Heart Failure

Measurement of Respiratory Muscle Blood Flow in Humans Using Near Infrared Spectroscopy and Indocyanine Green

2008 ◽  
Vol 40 (Supplement) ◽  
pp. S304
Author(s):  
Jordan A. Guenette ◽  
Ioannis Vogiatzis ◽  
Spyros Zakythinos ◽  
Dimitrios Athanasopoulos ◽  
Spyretta Golemati ◽  
...  
Keyword(s):  
Blood Flow ◽  
Infrared Spectroscopy ◽  
Indocyanine Green ◽  
Near Infrared Spectroscopy ◽  
Respiratory Muscle ◽  
Near Infrared ◽  
Muscle Blood Flow

Abstract 14822: Impact of Proportional Assist Ventilation on Skeletal Muscle Reoxygenation and Central Hemodynamic During Constant Work Rate Exercise in Chronic Heart Failure

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Audrey Borghi-Silva ◽  
Luiz Eduardo Nery ◽  
Dirceu R de Almeida ◽  
Jose Alberto Neder
Keyword(s):  
Heart Failure ◽  
Skeletal Muscle ◽  
Cardiac Output ◽  
Infrared Spectroscopy ◽  
Chronic Heart Failure ◽  
High Intensity ◽  
Near Infrared ◽  
Work Rate ◽  
Constant Work Rate ◽  
Kinetics Of

Introduction: Progressive chronic heart failure slows the recovery of microvascular oxygen delivery and utilization, which produce deleterious implications to exercise capacity. Respiratory muscle unloading can enhance the responses to exercise thereby allowing a closer matching between skeletal muscle oxygen delivery and utilization in patients with chronic heart failure (CHF). Hypothesis: We reasoned that noninvasive ventilation administered by proportional assisted ventilation (PAV) could accelerate skeletal muscle reoxygenation after high intensity exercise in CHF humans. To test this hypothesis, we conducted a study with 12 patients with stable CHF who were randomized to receive PAV or sham ventilation during high-intensity constant work exercise and compared the effects of these interventions on oxygen pulmonary (O2p), cardiac output and [[Unable to Display Character: &#8710;]][deoxi-Hb+Mb] off kinetics. Methods: Twelve patients with CHF (NYHA class II and III and left ventricle ejection fraction= 26±9%) underwent two high-intensity, constant-work rate (80% peak) cycle ergometer tests receiving PAV or sham ventilation. Off-exercise kinetics of the primary component of oxygen uptake, an index of fractional oxygen extraction by near infrared spectroscopy (~[[Unable to Display Character: &#8710;]][deoxy-Hb+Mb]) in the vastus lateralis) and cardiac output (QT) by impedance cardiography were assessed. Results: PAV significantly accelerated the recovery of O2p when compared with sham τ = 56±22 vs. 77±42s, respectively, p<0.05). Interestingly, PAV was associated with faster fractional O2 extraction (~[[Unable to Display Character: &#8710;]][deoxy-Hb+Mb] by near-infrared spectroscopy) (τ= 31±19 vs. 42±22s, respectively, p<0.05) . In addition, kinetics of QT were significantly faster with PAV than sham (τ = 39±22 vs. 78±46s, respectively, p<0.05). Conclusions: These data indicate that PAV has beneficial effects on recovery of muscle metabolism and central hemodynamics after high-intensity exercise in CHF patients. Financial Support: FAPESP 2009-01842-0

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