Detection of ventilatory threshold using near infrared spectroscopy in men and women

Bhambhani, Yagesh; Buckley, Shelley M.; Susaki, Toshio

doi:10.1097/00005768-199703000-00017

Cited by 77 publications

(74 citation statements)

References 15 publications

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“…The pattern of response during work, however, did not differ between the genders. An earlier report by Bhambhani et al (1997) also found no gender differences in relative trends during exercise, but the same authors did see gender differences in a later study (Bhambhani et al 1999). The gender difference in Raw scores represent mean value and standard deviation of electrodermal area (lS min À1 ), electrodermal responses (responses min À1 ), respiration rate (breaths min À1 ), skin blood flow (a.u.…”

Section: Muscle Oxygenationmentioning

confidence: 71%

Effects of time pressure and precision demands during computer mouse work on muscle oxygenation and position sense

Heiden¹,

Lyskov

Djupsjöbacka

et al. 2005

Eur J Appl Physiol

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The present study investigated the effects of time pressure and precision demands during computer mouse work on muscle oxygenation and position sense in the upper extremity. Twenty-four healthy subjects (12 males and 12 females) performed a 45-min standardized mouse-operated computer task on two occasions. The task consisted of painting rectangles that were presented on the screen. On one occasion, time pressure and precision demands were imposed (more demanding task, MDT), whereas, on the other occasion, no such restraints were added (less demanding task, LDT). The order of the two task versions was randomized. Tissue oxygen saturation in the trapezius and extensor carpi radialis muscles was recorded throughout, and the position-matching ability of the wrist was measured before and after the tasks. In addition, measurements of autonomic nervous system reactivity and subjective ratings of tenseness and physical fatigue were obtained. Performance was measured in terms of the number of rectangles that were painted during the task. During MDT, oxygen saturation in extensor carpi radialis decreased (P < 0.05) compared to LDT. These data were paralleled by increased electrodermal activity (P < 0.05), skin blood flow (P < 0.05), ratings of tenseness and fatigue (P < 0.01), and increased performance (P < 0.01) during MDT. Females exhibited lower oxygen saturation than males, during rest as well as during the computer tasks (P < 0.01). Wrist repositioning error increased following LDT as compared to MDT (P < 0.05). In conclusion, computer mouse work under time pressure and precision demands caused a decrease in forearm muscle oxygenation, but did not affect wrist position sense accuracy. We attribute our changes in oxygenation more to increased oxygen consumption as a result of enhanced performance, than to vasoconstriction.

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Section: Muscle Oxygenationmentioning

confidence: 71%

Effects of time pressure and precision demands during computer mouse work on muscle oxygenation and position sense

Heiden¹,

Lyskov

Djupsjöbacka

et al. 2005

Eur J Appl Physiol

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“…However, in many cases, these have merely sought to mimic currently available tools, such as lactate thresholds, albeit with the benefit of being noninvasive. 51,52 Even then, differences in optical properties of individuals make these measurements unreliable in many cases. 53 No one has yet been able to demonstrate a specific benefit of using muscle NIRS to track training in an individual.…”

Section: Real World Applicationsmentioning

confidence: 99%

Performance comparison of the MOXY and PortaMon near-infrared spectroscopy muscle oximeters at rest and during exercise

2018

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Abstract. The purpose of the study was to compare muscle oxygenation as measured by two portable, wireless near-infrared spectroscopy (NIRS) devices under resting and dynamic conditions. A recently developed low-cost NIRS device (MOXY) was compared against an established PortaMon system that makes use of the spatially resolved spectroscopy algorithm. The influence of increasing external pressure on tissue oxygen saturation index (TSI) indicated that both devices are stable between 2 and 20 mmHg. However, above this pressure, MOXY reports declining TSI values. Analysis of adipose tissue thickness (ATT) and TSI shows a significant, nonlinear difference between devices at rest. The devices report similar TSI (%) values at a low ATT (<7 mm) (PortaMon minus MOXY difference is þ1.1 AE 2.8%) with the major subsequent change between the devices occurring between 7 and 10 mm; at ATT values >10 mm the difference remains constant (−14.7 AE 2.8%). The most likely explanation for this difference is the small source-detector separation (2.5 cm) in the MOXY resulting in lower tissue penetration into muscle in subjects with higher ATT. Interday test-retest reliability of resting TSI was evaluated on five separate occasions, with the PortaMon reporting a lower coefficient of variation (1.8% to 2.5% versus 5.7% to 6.2%). In studies on male subjects with low ATT, decreases in the TSI were strongly correlated during isometric exercise, arterial occlusion, and incremental arm crank exercise. However, the MOXY reports a greater dynamic range, particularly during ischemia induced by isometric contraction or occlusion (Δ74.3% versus Δ43.7%; hyperemia MAX-occlusion MIN). This study shows that in this subject group both MOXY and PortaMon produce physiologically credible TSI measures during rest and exercise. However, the absolute values obtained during exercise are generally not comparable between devices unless corrected by physiological calibration following an arterial occlusion. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…In this study, the instrument was interfaced with an A/D board to process and record the tissue absorbency signal at a frequency of 30 Hz as previously described. 24 Prior to testing, the instrument was calibrated ®rst at 760 nM and then at 850 nM as suggested by the manufacturer. Muscle oxygenation measurements were undertaken from the right vastus lateralis muscle according to procedures described by Belardinelli et al 25 The probe was placed on the skin over a motor point of the muscle, about 12 ± 14 cms from the anterior border of the knee, parallel to the major axis of the thigh.…”

Section: Metabolic and Cardiorespiratory Measurementsmentioning

confidence: 99%

“…24,25 The increased oxygenation at the onset of exercise has been attributed to a redistribution of existing blood ow within the muscle 25 and/or increased skin blood ow. 30 The systematic decrease in oxygenation with increasing intensity implies a greater release of oxygen by hemoglobin/myoglobin via the Bohr e ect.…”

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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Detection of ventilatory threshold using near infrared spectroscopy in men and women

Cited by 77 publications

References 15 publications

Effects of time pressure and precision demands during computer mouse work on muscle oxygenation and position sense

Effects of time pressure and precision demands during computer mouse work on muscle oxygenation and position sense

Performance comparison of the MOXY and PortaMon near-infrared spectroscopy muscle oximeters at rest and during exercise

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

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