The present and future use of functional near‐infrared spectroscopy (fNIRS) for cognitive neuroscience

Annals of the New York Academy of Sciences, Journal Year: 2018, Volume and Issue: 1464(1), P. 5 - 29

Published: Aug. 7, 2018

Abstract The past few decades have seen a rapid increase in the use of functional near‐infrared spectroscopy (fNIRS) cognitive neuroscience. This fast growth is due to several advances that fNIRS offers over other neuroimaging modalities such as magnetic resonance imaging and electroencephalography/magnetoencephalography. In particular, harmless, tolerant bodily movements, highly portable, being suitable for all possible participant populations, from newborns elderly experimental settings, both inside outside laboratory. this review we aim provide comprehensive state‐of‐the‐art basics, technical developments, applications. discuss some open challenges potential neuroscience research, with particular focus on naturalistic environments social

Language: Английский

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Understanding near infrared spectroscopy and its application to skeletal muscle research

Journal of Applied Physiology, Journal Year: 2019, Volume and Issue: 126(5), P. 1360 - 1376

Published: March 7, 2019

Near infrared spectroscopy (NIRS) is a powerful noninvasive tool with which to study the matching of oxygen delivery utilization and number new publications utilizing this technique has increased exponentially in last 20 yr. By measuring state oxygenation primary heme compounds skeletal muscle (hemoglobin myoglobin), greater understanding underlying control mechanisms that couple perfusive diffusive oxidative metabolism can be gained from laboratory athletic field intensive care unit or emergency room. However, NIRS been complicated by diversity instrumentation, inherent limitations some these technologies, associated terminology, general lack standardization protocols. This Cores Reproducibility Physiology (CORP) will describe basic but important detail most common methodologies NIRS, their strengths limitations, discuss potential confounding factors affect quality reproducibility data. Recommendations are provided reduce variability errors data collection, analysis, interpretation. The goal CORP provide readers methodology, best practices so as improve research muscle.

Language: Английский

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International Journal of Sports Medicine

International Journal of Sports Medicine, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 2, 2024

The aim was to examine the association between this breakpoint (NIRS) and VT2 in welltrained runners.Gas exchange NIRS data were collected during an incremental VO2max running test for 10 well-trained runners.The calculated oxygen saturation (StO2) determined compared terms relative %VO2max, absolute speed, VO2 maximum heart rate (HRmax).There no significant differences (p>0.05) StO2 %VO2max (87.00±6.14 88.28±3.98 %), speed (15.70±1.42 16.10±1.66km•h -1 ), (53.71±15.17and 54.66±15.57ml•kg •min ) %HRmax (90.90± 4.17 91.84 ± 3.70 %).There large correlations instruments (r=0.68,p<0.05), (r=0.86,p<0.001),VO2 (r=0.86,p<0.001) (r = 0.69; p<0.05).A Bland Altman analysis of agreement resulted a mean difference -1.27±4.49%,-0.40±0.84km•h , -0.90±3.07ml•kg -0.94±3.14 %HRmax, respectively.We conclude that portable determination is comparable with using gas therefore appropriate use determining exercise training above intensity.This first study analyze validity mode device.

Language: Английский

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Muscle Oximetry in Sports Science: An Updated Systematic Review

Sports Medicine, Journal Year: 2024, Volume and Issue: 54(4), P. 975 - 996

Published: Feb. 12, 2024

Abstract Background In the last 5 years since our systematic review, a significant number of articles have been published on technical aspects muscle near-infrared spectroscopy (NIRS), interpretation signals and benefits using NIRS technique to measure physiological status muscles determine workload working muscles. Objectives Considering consistent studies application oximetry in sports science over years, objectives this updated review were highlight applications assessment skeletal oxidative performance activities emphasize how technology has applied exercise training years. addition, some recent instrumental developments will be briefly summarized. Methods Preferred Reporting Items for Systematic Reviews guidelines followed fashion search, appraise synthesize existing literature topic. Electronic databases such as Scopus, MEDLINE/PubMed SPORTDiscus searched from March 2017 up 2023. Potential inclusions screened against eligibility criteria relating recreationally trained elite athletes, with or without programmes, who must assessed variables monitored by commercial oximeters instrumentation. Results Of identified records, 191 regrouping 3435 participants, met criteria. This highlighted key findings 37 domains sport activities. Overall, information can used meaningful marker capacity become one primary monitoring tools practice conjunction with, comparison heart rate mechanical power indices diverse contexts across different types interventions. Conclusions Although feasibility success use is well documented, there still need further development overcome current limitations. Longitudinal are urgently needed strengthen science.

Language: Английский

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Determination of Ventilatory Thresholds Using Near-Infrared Spectroscopy in Recreational Endurance and CrossFit Athletes

International Journal of Sports Physiology and Performance, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 10

Published: Jan. 1, 2025

To define training zones, ventilatory thresholds (VTs) are commonly established by cardiopulmonary gas-exchange analysis during incremental exercise tests. Portable near-infrared spectroscopy (NIRS) devices have emerged as a potential tool for detecting these monitoring muscle oxygenation. This study evaluated the accuracy of NIRS measurements to determine VTs or critical power (CP) based on oxygen saturation and assesses device’s consistency across 2 constant-load Data from cross-sectional studies involving trained recreational endurance athletes (26 1) CrossFit (59 2) were examined. Incremental ramp tests cycle ergometer performed followed either test (study CP 2). When comparing output heart rate between NIRS-derived breakpoints VTs, weak moderate agreement was found. Mean differences in ranged 16.8 22.4 W 3.8 6.0 beats·min −1 at first threshold 27.4 31.2 7.1 7.8 second threshold. Comparing with CP, mean −0.4 0.4 −0.6 0.9 . Test–retest reliability showed agreement, bias 1.2 percentage points Thus, may not be accurate determining due limited hear rate, notable variability individual level, reproducibility.

Language: Английский

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

Journal of Biomedical Optics, Journal Year: 2018, Volume and Issue: 23(01), P. 1 - 1

Published: Jan. 24, 2018

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) compared against an established PortaMon system that makes use spatially resolved algorithm. influence increasing external pressure on tissue oxygen saturation index (TSI) indicated both are stable between 2 20 mmHg. However, above this pressure, MOXY reports declining TSI values. Analysis adipose thickness (ATT) shows a significant, nonlinear difference at rest. report similar (%) values low ATT (<7 mm) (PortaMon minus is +1.1±2.8%) with major subsequent change occurring 7 10 mm; >10 mm remains constant (−14.7±2.8%). most likely explanation for small source–detector separation (2.5 cm) in resulting lower penetration into subjects higher ATT. Interday test–retest reliability evaluated five separate occasions, reporting coefficient variation (1.8% 2.5% versus 5.7% 6.2%). In studies male ATT, decreases were strongly correlated during isometric exercise, arterial occlusion, incremental arm crank exercise. greater range, particularly ischemia induced contraction or occlusion (Δ74.3% Δ43.7%; hyperemia MAX—occlusion MIN). This subject group produce physiologically credible measures rest absolute obtained exercise generally not comparable unless corrected physiological calibration following occlusion.

Language: Английский

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Real-time feedback by wearables in running: Current approaches, challenges and suggestions for improvements

Journal of Sports Sciences, Journal Year: 2019, Volume and Issue: 38(2), P. 214 - 230

Published: Dec. 3, 2019

Injuries and lack of motivation are common reasons for discontinuation running. Real-time feedback from wearables can reduce by reducing injury risk improving performance motivation. There however several limitations challenges with current real-time approaches. We discuss these provide a framework to optimise first the why individuals run propose that targeted improve compliance. Secondly, we review association running technique workload injuries elaborate how on be applied also different modalities motor learning strategies their application feedback. Briefly, most effective modality frequency differ between variables individuals, but combination mixture delayed is effective. Moreover, promoting perceived competence, autonomy an external focus motivation, performance. Although wearables, practical applications relevant laboratory-based gait retraining.

Language: Английский

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Near-infrared spectroscopy-derived muscle oxygen saturation on a 0% to 100% scale: reliability and validity of the Moxy Monitor

Journal of Biomedical Optics, Journal Year: 2019, Volume and Issue: 24(11), P. 1 - 1

Published: Nov. 18, 2019

Near-infrared spectroscopy (NIRS) to monitor muscle oxygen saturation (SmO₂) is rapidly expanding into applied sports settings. However, the technology limited due its inability convey quantifiable values. A test battery assess reliability and validity of a 0% 100% scale modeled by commercially available NIRS device was established. This applies commonly used technique, arterial occlusion method (AOM) repeatability, reproducibility, face validity. total 22 participants completed scrutinize provided device. All underwent repeated AOM tests in passive active conditions. The SmO₂ minimum maximum values were obtained from subsequent analysis. Repeatability reproducibility tested for equivalency Bland–Altman plots generated. Face assessed testing against an a priori defined threshold mixed venous blood during response. exhibits appropriately functional that reliable terms repeatability reproducibility. Under conditions design, considered valid application sports.

Language: Английский

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Non-invasive Techniques for Muscle Fatigue Monitoring: A Comprehensive Survey

ACM Computing Surveys, Journal Year: 2024, Volume and Issue: 56(9), P. 1 - 40

Published: Feb. 20, 2024

Muscle fatigue represents a complex physiological and psychological phenomenon that impairs physical performance increases the risks of injury. It is important to continuously monitor levels for early detection management fatigue. The classification muscle also provide information in human-computer interactions (HMI), sports injuries performance, ergonomics, prosthetic control. With this purpose mind, review first provides an overview mechanisms its biomarkers further enumerates various non-invasive techniques commonly used monitoring literature, including electromyogram (EMG), which records electrical activity during contractions, mechanomyogram (MMG), vibration signals fibers, near-infrared spectroscopy (NIRS), measures amount oxygen muscle, ultrasound (US), deformation contractions. This introduces principle mechanism, parameters detection, application advantages disadvantages each technology detail. To conclude, limitations/challenges need be addressed future research area are presented.

Language: Английский

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Validation of a novel wearable, wireless technology to estimate oxygen levels and lactate threshold power in the exercising muscle

Physiological Reports, Journal Year: 2018, Volume and Issue: 6(7), P. e13664 - e13664

Published: April 1, 2018

There is a growing interest in monitoring muscle oxygen saturation (SmO2), which localized measure of oxidative metabolism and can be acquired continuously noninvasively using near-infrared spectroscopy (NIRS) methods. Most NIRS systems are cumbersome, expensive, fiber coupled devices, with use limited to lab settings. A novel, low cost, wireless, wearable has been developed for athletic training. In this study, we evaluate the advantages limitations new simple continuous-wave (CW) device respect benchtop, frequency-domain (FDNIRS) system. Oxygen hemoglobin/myoglobin concentration exercising muscles 17 individuals were measured simultaneously two systems, while subjects performed an incremental test on stationary cycle ergometer. addition, blood lactate was at end each increment analyzer. During exercise, correlation coefficients SmO2 concentrations between over 0.70. We also found both insensitive presence thin layers varying absorption, mimicking different skin colors. Neither system able predict athletes’ threshold power accurately by simply thresholds. Instead, proprietary software within half one cycling test. These results indicate novel may provide physiological indicator athlete's exertion.

Language: Английский

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