&lt;title&gt;Accurate NIRS measurement of muscle oxygenation by correcting the influence of a subcutaneous fat layer&lt;/title&gt;

Yamamoto, Katsuyuki; Niwayama, Masatsugu; Li, Gang; Shiga, Tohru; Kudo, Nobuki; Takahashi, Makoto

doi:10.1117/12.301049

Cited by 33 publications

(40 citation statements)

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“…Studies that have examined the in¯uence of skinfold thickness on tissue deoxygenation using NIRS have indicated that the thickness of the fat layer ranging from 4 to 10 mm could result in a threefold di erence in the tissue absorbency measurement. 37,38 In this study, skinfold thickness at the NIRS measurement site was not recorded, and therefore, the values could not be corrected for this variable in the two groups of subjects. It should be noted, however, that the NIRS probe of this instrument is designed to have a penetration depth, which is approximately 60% of the distance between the light source and the optodes, or a penetration equivalent to 2.5 ± 3 cm.…”

Section: Muscle Oxygenation Trendsmentioning

confidence: 99%

Quadriceps muscle deoxygenation during functional electrical stimulation in adults with spinal cord injury

et al. 2000

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Study design: Cross-sectional study comparing healthy subjects with age and gender matched subjects with spinal cord injury (SCI, injury levels from C5 to T12). Objectives: To compare the acute cardiorespiratory responses and muscle oxygenation trends during functional electrical stimulation (FES) cycle exercise and recovery in the SCI and healthy subjects exercising on a mechanical cycle ergometer. Setting: Seven volunteers in each group participated in one exercise test at the Rick Hansen Center, University of Alberta, Edmonton, Canada. Methods: Both groups completed a stagewise incremental test to voluntary fatigue followed by 2 min each of active and passive recovery. Cardiorespiratory responses were continuously monitored using an automated metabolic cart and a wireless heart rate monitor. Tissue absorbency, an index of muscle oxygenation, was monitored non-invasively from the vastus lateralis using near infrared spectroscopy. Results: The healthy subjects showed signi®cant (P50.05) increases in the oxygen uptake (V . O 2 ), heart rate (HR) and ventilation rate (V . E ) from rest to maximal exercise. The SCI subjects showed a twofold increase in V . O 2 (P40.05), a threefold increase in V . E (P50.05) and a 5 beats/min increase in HR (P40.05) from the resting value. The SCI subjects demonstrated a lesser degree (P50.05) of muscle deoxygenation than the healthy subjects during the transition from rest to exercise. Regression analysis indicated that the rate of decline in muscle deoxygenation with respect to the V . O 2 was signi®cantly (P50.05) faster in the SCI subjects compared to healthy subjects. Conclusions: FES exercise in SCI subjects elicits: (a) modest increases in the cardiorespiratory responses when compared to resting levels; (b) lower degree of muscle deoxygenation during maximal exercise, and (c) faster changes in muscle deoxygenation with respect to the V . O 2 during exercise when compared to healthy subjects. Spinal Cord (2000) 38, 630 ± 638

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Section: Muscle Oxygenation Trendsmentioning

confidence: 99%

Quadriceps muscle deoxygenation during functional electrical stimulation in adults with spinal cord injury

et al. 2000

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“…One key difficulty in using the NIR device on skeletal muscle is the influence of subcutaneous fat [31]. Previous studies have reported that NIR devices get signals from tissues at depths of up to 1/3-1/2 the separation distance between light source and detector [10,[32][33][34].…”

Section: Fig 3 Typical Changes For Nir-o 2 Saturation (Top)mentioning

confidence: 99%

Regional Difference of Muscle Oxygen Saturation and Blood Volume during Exercise Determined by Near Infrared Imaging Device.

Miura

McCully²,

Liang³

et al. 2001

JJP

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During exercise, the metabolic need for oxygen in muscles increases many times above the resting level. To meet this oxygen demand, oxygen supply to the contracting muscle must increase; this is accomplished by an increased cardiac output and a redistribution of the blood supply. During exercise, heteroJapanese Journal of Physiology Vol. 51, No. 5, 2001 599Japanese Journal of Physiology, 51, 599-606, 2001 Key words: near infrared light, imaging, oxygen saturation, blood volume, heterogeneity.Abstract: Using a near infrared (NIR) imaging device, we tested the hypothesis that regional differences in oxygen status could be detected in the gastrocnemius muscle during exercise and recovery. Six healthy subjects performed the standing plantar flexion exercises for 2 min; the frequency was one contraction per second. The NIR imaging device was placed over the medial head of the right gastrocnemius muscle and the signals from two optical sensors situated on the middle proximal and middle distal portions were used. The NIR-O 2 saturation (difference between deoxygenated and oxygenated Hb signals) and NIR-blood volume (sum of the oxygenated and deoxygenated Hb signals) were calculated in optical density units. Plantar flexion resulted in more deoxygenation during exercise and more reoxygenation during recovery in the distal portion compared with the proximal portion. The changes in NIR-O 2 between rest and a 2 min exercise, and between a 2 min exercise and a 3 min recovery were 0.11 and Ϫ0.23, respectively, in the distal portion, which were significantly larger than proximal values (0.05 and Ϫ0.10, pϽ0.05). Plantar flexion resulted in lower NIR-blood volumes during exercise and greater recovery of blood after exercise in the distal portion compared with the proximal portion. The changes in NIR blood volume between rest and a 2 min exercise and between a 2 min exercise and a 3 min recovery were Ϫ0.19 and 0.31, respectively, in the distal portion, significantly larger than proximal values (Ϫ0.07 and 0.12, pϽ0.05 for all comparisons). These findings indicate that the distal portion of the medial gastrocnemius had larger changes in NIR-O 2 saturation and NIR-blood volume than the proximal portion had. This is consistent with the distal portion having a greater impairment of blood flow possibly because of the higher intramuscular pressure during exercise. In conclusion: (1) regional differences in oxygen status in the gastrocnemius muscle were detected with exercise, with the distal portion having greater NIR-O 2 saturation and NIR-blood volume changes, and (2) the NIR imaging device might be a useful method to detect the regional differences of oxygen status in the muscle.

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“…[1,15]. Because the forearm skinfold thickness of young males selected in this study was relatively thin (2-4 mm), individual differences are considered to be small.…”

Section: Discussionmentioning

confidence: 99%

Comparison of oxygenation kinetics measured by different placements of the NIRS probe during sustained isometric gripping

2007

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<title>Accurate NIRS measurement of muscle oxygenation by correcting the influence of a subcutaneous fat layer</title>

Cited by 33 publications

References 0 publications

Quadriceps muscle deoxygenation during functional electrical stimulation in adults with spinal cord injury

Quadriceps muscle deoxygenation during functional electrical stimulation in adults with spinal cord injury

Regional Difference of Muscle Oxygen Saturation and Blood Volume during Exercise Determined by Near Infrared Imaging Device.

Comparison of oxygenation kinetics measured by different placements of the NIRS probe during sustained isometric gripping

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