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Attia ABE, Moothanchery M, Li X, Yew YW, Thng STG, Dinish U, Olivo M. Microvascular imaging and monitoring of hemodynamic changes in the skin during arterial-venous occlusion using multispectral raster-scanning optoacoustic mesoscopy. PHOTOACOUSTICS 2021; 22:100268. [PMID: 34026491 PMCID: PMC8122174 DOI: 10.1016/j.pacs.2021.100268] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 04/15/2021] [Accepted: 04/16/2021] [Indexed: 05/18/2023]
Abstract
The ability to monitor oxygen delivery in microvasculature plays a vital role in measuring the viability of skin tissue and the probability of recovery. Using currently available clinical imaging tools, it is difficult to observe non-invasive hemodynamic regulation in the peripheral vessels. Here we propose the use of a novel multispectral raster-scanning optoacoustic mesoscopy (RSOM) system for noninvasive clinical monitoring of hemodynamic changes in the skin microvasculature's oxy- (HbO2) and deoxy-hemoglobin (Hb), total hemoglobin (HbT) and oxygen saturation (rsO2). High resolution images of hemoglobin distribution in the skin microvasculature from six healthy volunteers during venous and arterial occlusion, simulating systemic vascular diseases are presented. During venous occlusion, Hb and HbO2 optoacoustic signals showed an increasing trend with time, followed by a drop in the values after cuff deflation. During arterial occlusion, an increase in Hb value and decrease in HbO2 values was observed, followed by a drop in Hb and jump in HbO2 values after the cuff deflation. A decrease in rsO2 values during both venous and arterial occlusion was observed with an increase in value after occlusion release. Using this proof of concept study, hereby we propose multispectral RSOM as a novel tool to measure high resolution hemodynamic changes in microvasculature for investigating systemic vascular diseases on peripheral tissues and also for monitoring inflammatory skin diseases, and its therapeutic interventions.
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Affiliation(s)
- Amalina Binte Ebrahim Attia
- Laboratory of Bio Optical Imaging, Singapore Bioimaging Consortium, Agency of Science, Technology and Research (A*STAR), Singapore
| | - Mohesh Moothanchery
- Laboratory of Bio Optical Imaging, Singapore Bioimaging Consortium, Agency of Science, Technology and Research (A*STAR), Singapore
| | - Xiuting Li
- Laboratory of Bio Optical Imaging, Singapore Bioimaging Consortium, Agency of Science, Technology and Research (A*STAR), Singapore
| | | | | | - U.S. Dinish
- Laboratory of Bio Optical Imaging, Singapore Bioimaging Consortium, Agency of Science, Technology and Research (A*STAR), Singapore
- Corresponding authors.
| | - Malini Olivo
- Laboratory of Bio Optical Imaging, Singapore Bioimaging Consortium, Agency of Science, Technology and Research (A*STAR), Singapore
- Corresponding authors.
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Kelsch E, Diana JC, Burnet K, Hanson ED, Fryer SF, Credeur DP, Stone KJ, Stoner L. Arterial stiffness responses to prolonged sitting combined with a high-glycemic-index meal: a double-blind, randomized crossover trial. J Appl Physiol (1985) 2021; 131:229-237. [PMID: 34043475 DOI: 10.1152/japplphysiol.00030.2021] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Regular exposure to uninterrupted prolonged sitting and the consumption of high-glycemic-index (HGI) meals is independently associated with increased cardiovascular disease risk. Sitting for as little as 1 h can impair the health of both peripheral and central arteries. However, it is currently unknown whether combined acute exposure to uninterrupted prolonged sitting and an HGI meal is more detrimental to global (peripheral and central) vascular health. The purpose of this study was to investigate the effect of prolonged sitting (3 h), following the consumption of an HGI or a low-glycemic-index (LGI) meal, on global pulse wave velocity (G-PWV). Eighteen healthy participants [70% female, mean (standard deviation, SD) age = 22.6 (3.1) yr, body mass index (BMI) = 25.5 (6.1) kg/m2] sat for 3 h after consuming an HGI or LGI meal. G-PWV was assessed by incorporating three PWV measures (carotid-femoral, brachial-femoral, and femoral-ankle). The effects of time (PRE vs. POST) and condition (LGI vs. HGI) were analyzed using linear mixed models. Following prolonged sitting, G-PWV increased by 0.29 m/s (i.e., PRE vs. POST). However, the condition (P = 0.987) and time × condition (P = 0.954) effects were nonsignificant. The current findings support previous research showing an increase in arterial stiffness with prolonged sitting. However, in young and healthy adults, the arterial stiffness response was not worsened through HGI meal consumption.NEW & NOTEWORTHY We used novel statistical techniques and study design characteristics to examine how the cardiovascular disruptions due to prolonged sitting are changed after the consumption of low- and high-glycemic-index meals. The current study indicates that changes in arterial stiffness due to prolonged sitting are not worsened in young, healthy adults after the consumption of a high-glycemic-index meal.
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Affiliation(s)
- Elizabeth Kelsch
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Jake C Diana
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Kathryn Burnet
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Erik D Hanson
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Simon F Fryer
- School of Sport and Exercise, University of Gloucestershire, Gloucester, United Kingdom
| | - Daniel P Credeur
- School of Kinesiology and Nutrition, The University of Southern Mississippi, Hattiesburg, Mississippi
| | - Keeron J Stone
- School of Sport and Exercise, University of Gloucestershire, Gloucester, United Kingdom
| | - Lee Stoner
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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53
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Theodorakopoulou MP, Bakaloudi DR, Dipla K, Zafeiridis A, Boutou AK. Vascular endothelial damage in COPD: current functional assessment methods and future perspectives. Expert Rev Respir Med 2021; 15:1121-1133. [PMID: 33874819 DOI: 10.1080/17476348.2021.1919089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Introduction: Cardiovascular disease is a major cause of death in chronic obstructive pulmonary disease (COPD), but the relationship between these two entities is not fully understood; smoking, inflammation, arterial stiffness and endothelial dysfunction are significant determinants. Endothelial dysfunction is not only associated with cardiovascular disease, but also with COPD severity.Areas covered: Several functional methods have been developed to evaluate endothelial function in healthy and diseased individuals; from the invasive angiography of epicardial coronary arteries and Venous-Occlusion-Plethysmography, to more modern, noninvasive approaches such as Flow-Mediated-Dilatation, Peripheral-Arterial-Tonometry and Near-Infrared-Spectroscopy, all these methods have boosted clinical research in this field. In this context, this narrative review, which included articles published in PubMed and Scopus up to 25-November-2020, summarizes available functional methods for endothelial damage assessment in COPD and discusses existing evidence on their associations with comorbidities and outcomes in this population.Expert opinion: Accumulated evidence suggests that endothelial dysfunction occurs in early stages of CΟPD and worsens with pulmonary obstruction severity and during acute exacerbations. Novel methods evaluating endothelial function offer a detailed, real-time assessment of different parameters related to vascular function and should be increasingly used to shed more light on the role of endothelial damage on cardiovascular and COPD progression.
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Affiliation(s)
- Marieta P Theodorakopoulou
- Department of Nephrology, Hippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Dimitra Rafailia Bakaloudi
- Department of Nephrology, Hippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Konstantina Dipla
- Exercise Physiology & Biochemistry Laboratory, Department of Sport Sciences at Serres, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Andreas Zafeiridis
- Exercise Physiology & Biochemistry Laboratory, Department of Sport Sciences at Serres, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Afroditi K Boutou
- Department of Respiratory Medicine, G. Papanikolaou Hospital, Thessaloniki, Greece
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Burnet K, Blackwell J, Kelsch E, Hanson ED, Stone K, Fryer S, Credeur D, Palta P, Stoner L. Cerebrovascular function response to prolonged sitting combined with a high-glycemic index meal: A double-blind, randomized cross-over trial. Psychophysiology 2021; 58:e13830. [PMID: 33908629 DOI: 10.1111/psyp.13830] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 03/14/2021] [Accepted: 03/17/2021] [Indexed: 12/26/2022]
Abstract
Acute prolonged sitting leads to cerebrovascular disruptions. However, it is unclear how prolonged sitting interacts with other common behaviors, including high- (HGI) and low-glycemic index (LGI) meals. Using a double-blind randomized cross-over design, this study evaluated the effects of prolonged (3 hr) sitting, with a high- (HGI; GI: 100) or low-glycemic index (LGI; GI: 19) meal on total brain blood flow (QBrain ) and executive function. Eighteen young, healthy, active participants (22.6 [3.1] y, 33% F, 24.3 [3.7] kg/m2 ) sat for 3 hr after consuming an HGI or LGI meal. Using Doppler ultrasound to measure internal carotid (ICA) and vertebral (VA) artery blood flow, QBrain was calculated: (ICA blood flow + VA blood flow) × 2. Executive function was assessed using the Stroop Test and Trail Making Test-Part B. Brain fog was measured using a modified Borg Category Scale with Ratio properties (CR10). Following 3 hr of sitting, there was a significant decrease in QBrain with time (p = .001, ES = -0.26), though there were nonsignificant interaction (p = .216) and condition effects (p = .174). Brain fog increased (p = .024, ES = 0.27) and Stroop reaction time worsened with time (p = .001, ES: -0.40), though there were nonsignificant condition effects for brain fog (p = .612) and the Stroop test (p = .445). There was a nonsignificant condition effect (p = .729) for the Trail Making Test-Part B, but completion time improved with time (p = .001, ES = -0.40). In conclusion, 3 hr of prolonged sitting decreases QBrain and executive function independent of glycemic index in young, healthy adults.
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Affiliation(s)
- Kathryn Burnet
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Jade Blackwell
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Elizabeth Kelsch
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Erik D Hanson
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Keeron Stone
- School of Sport and Exercise, University of Gloucestershire, Gloucester, UK
| | - Simon Fryer
- School of Sport and Exercise, University of Gloucestershire, Gloucester, UK
| | - Daniel Credeur
- Department of Biology, Ave Maria University, Ave Maria, FL, USA
| | - Priya Palta
- Department of Medicine, Division of General Medicine, Columbia University Medical Center, New York, NY, USA
| | - Lee Stoner
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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Jones S, Tillin T, Park C, Williams S, Rapala A, Al Saikhan L, Eastwood SV, Richards M, Hughes AD, Chaturvedi N. Cohort Profile Update: Southall and Brent Revisited (SABRE) study: a UK population-based comparison of cardiovascular disease and diabetes in people of European, South Asian and African Caribbean heritage. Int J Epidemiol 2021; 49:1441-1442e. [PMID: 33049759 PMCID: PMC7746410 DOI: 10.1093/ije/dyaa135] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 07/07/2020] [Indexed: 12/15/2022] Open
Affiliation(s)
- Siana Jones
- MRC Unit for Lifelong Health & Ageing at UCL, Department of Population Science & Experimental Medicine, Institute for Cardiovascular Science, UCL, London, UK
| | - Therese Tillin
- MRC Unit for Lifelong Health & Ageing at UCL, Department of Population Science & Experimental Medicine, Institute for Cardiovascular Science, UCL, London, UK
| | - Chloe Park
- MRC Unit for Lifelong Health & Ageing at UCL, Department of Population Science & Experimental Medicine, Institute for Cardiovascular Science, UCL, London, UK
| | - Suzanne Williams
- MRC Unit for Lifelong Health & Ageing at UCL, Department of Population Science & Experimental Medicine, Institute for Cardiovascular Science, UCL, London, UK
| | - Alicja Rapala
- MRC Unit for Lifelong Health & Ageing at UCL, Department of Population Science & Experimental Medicine, Institute for Cardiovascular Science, UCL, London, UK
| | - Lamia Al Saikhan
- MRC Unit for Lifelong Health & Ageing at UCL, Department of Population Science & Experimental Medicine, Institute for Cardiovascular Science, UCL, London, UK.,Department of Cardiac Technology, College of Applied Medical Sciences, Imam Abdulrahman Bin Faisal University, Dammam, Kingdom of Saudi Arabia
| | - Sophie V Eastwood
- MRC Unit for Lifelong Health & Ageing at UCL, Department of Population Science & Experimental Medicine, Institute for Cardiovascular Science, UCL, London, UK
| | - Marcus Richards
- MRC Unit for Lifelong Health & Ageing at UCL, Department of Population Science & Experimental Medicine, Institute for Cardiovascular Science, UCL, London, UK
| | - Alun D Hughes
- MRC Unit for Lifelong Health & Ageing at UCL, Department of Population Science & Experimental Medicine, Institute for Cardiovascular Science, UCL, London, UK
| | - Nishi Chaturvedi
- MRC Unit for Lifelong Health & Ageing at UCL, Department of Population Science & Experimental Medicine, Institute for Cardiovascular Science, UCL, London, UK
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The Acute Physiological and Perceptual Effects of Individualizing the Recovery Interval Duration Based Upon the Resolution of Muscle Oxygen Consumption During Cycling Exercise. Int J Sports Physiol Perform 2021; 16:1580-1588. [PMID: 33848976 DOI: 10.1123/ijspp.2020-0295] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 10/22/2020] [Accepted: 12/01/2020] [Indexed: 11/18/2022]
Abstract
PURPOSE There has been paucity in research investigating the individualization of recovery interval duration during cycling-based high-intensity interval training (HIIT). The main aim of the study was to investigate whether individualizing the duration of the recovery interval based upon the resolution of muscle oxygen consumption would improve the performance during work intervals and the acute physiological response of the HIIT session, when compared with a standardized (2:1 work recovery ratio) approach. METHODS A total of 16 well-trained cyclists (maximal oxygen consumption: 60 [7] mL·kg-1·min-1) completed 6 laboratory visits: (Visit 1) incremental exercise test, (Visit 2) determination of the individualized (IND) recovery duration, using the individuals' muscle oxygen consumption recovery duration to baseline from a 4- and 8-minute work interval, (Visits 3-6) participants completed a 6 × 4- and a 3 × 8-minute HIIT session twice, using the IND and standardized recovery intervals. RESULTS Recovery duration had no effect on the percentage of the work intervals spent at >90% and >95% of maximal oxygen consumption, maximal minute power output, and maximal heart rate, during the 6 × 4- and 3 × 8-minute HIIT sessions. Recovery duration had no effect on mean work interval power output, heart rate, oxygen consumption, blood lactate, and rating of perceived exertion. There were no differences in reported session RPE between recovery durations for the 6 × 4- and 3 × 8-minute HIIT sessions. CONCLUSION Individualizing HIIT recovery duration based upon the resolution of muscle oxygen consumption to baseline levels does not improve the performance of the work intervals or the acute physiological response of the HIIT session, when compared with standardized recovery duration.
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Guerraty M, Bhargava A, Senarathna J, Mendelson AA, Pathak AP. Advances in translational imaging of the microcirculation. Microcirculation 2021; 28:e12683. [PMID: 33524206 PMCID: PMC8647298 DOI: 10.1111/micc.12683] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 01/18/2021] [Accepted: 01/26/2021] [Indexed: 12/21/2022]
Abstract
The past few decades have seen an explosion in the development and use of methods for imaging the human microcirculation during health and disease. The confluence of innovative imaging technologies, affordable computing power, and economies of scale have ushered in a new era of "translational" imaging that permit us to peer into blood vessels of various organs in the human body. These imaging techniques include near-infrared spectroscopy (NIRS), positron emission tomography (PET), and magnetic resonance imaging (MRI) that are sensitive to microvascular-derived signals, as well as computed tomography (CT), optical imaging, and ultrasound (US) imaging that are capable of directly acquiring images at, or close to microvascular spatial resolution. Collectively, these imaging modalities enable us to characterize the morphological and functional changes in a tissue's microcirculation that are known to accompany the initiation and progression of numerous pathologies. Although there have been significant advances for imaging the microcirculation in preclinical models, this review focuses on developments in the assessment of the microcirculation in patients with optical imaging, NIRS, PET, US, MRI, and CT, to name a few. The goal of this review is to serve as a springboard for exploring the burgeoning role of translational imaging technologies for interrogating the structural and functional status of the microcirculation in humans, and highlight the breadth of current clinical applications. Making the human microcirculation "visible" in vivo to clinicians and researchers alike will facilitate bench-to-bedside discoveries and enhance the diagnosis and management of disease.
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Affiliation(s)
- Marie Guerraty
- Division of Cardiovascular Medicine, Department of
Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA,
USA
| | - Akanksha Bhargava
- Russell H. Morgan Department of Radiology and Radiological
Science, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Janaka Senarathna
- Russell H. Morgan Department of Radiology and Radiological
Science, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Asher A. Mendelson
- Department of Medicine, Section of Critical Care, Rady
Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Arvind P. Pathak
- Russell H. Morgan Department of Radiology and Radiological
Science, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Biomedical Engineering, The Johns Hopkins
University School of Medicine, Baltimore, MD, USA
- Department of Electrical Engineering, Johns Hopkins
University, Baltimore, MD, USA
- Sidney Kimmel Comprehensive Cancer Center, The Johns
Hopkins University School of Medicine, Baltimore, MD, USA
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58
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Horiuchi M, Stoner L. Effects of compression stockings on lower-limb venous and arterial system responses to prolonged sitting: A randomized cross-over trial. Vasc Med 2021; 26:386-393. [DOI: 10.1177/1358863x20988899] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Exposure to prolonged sitting increases blood pooling and the risk of lower-extremity vascular arterial and venous complications, including deep vein thrombosis. Compression garment stockings (CGS) may prevent pooling, thereby mitigating the associated vascular complications. Three aims were addressed: (i) does use of CGS help to prevent blood pooling; (ii) does blood pooling correlate with decreased stroke volume; and (iii) does use of CGS preserve leg arterial flow-mediated dilation and reactive hyperemia response. Twenty inactive participants (22 ± 4 years, 30% female, 22.1 ± 2.0 kg/m2) were randomized to sit for 3 hours with (CGS) and without use of CGS. Blood pooling was determined using medial gastrocnemius total hemoglobin. Stroke volume was estimated using finger photoplethysmography, respectively. Macrovascular and microvascular function were measured using popliteal artery flow-mediated dilation and reactive hyperemia, respectively. In response to 3 hours of sitting: (i) there was an interaction effect for total hemoglobin ( p < 0.001); the condition without use of CGS increased 10.5% (95% CI: 6.7 to 14.3) and CGS increased 4.3% (95% CI: 0.1 to 7.7); (ii) blood pooling was negatively associated with stroke volume ( r = −0.58, 95% CI: −0.68 to −0.45); (iii) reactive hyperemia and flow-mediated arterial dilation was impaired after prolonged sitting, and use of CGS was not associated with attenuation of this impairment. Use of CGS decreases blood pooling but does not preserve arterial macrovascular and microvascular responses to prolonged sitting. Further study is warranted to determine whether CGS has additive benefits when combined with sitting interruption strategies.
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Affiliation(s)
- Masahiro Horiuchi
- Division of Human Environmental Science, Mount Fuji Research Institute, Fuji-yoshida City, Yamanashi, Japan
| | - Lee Stoner
- Department of Exercise and Sports Science, University of North Carolina, Chapel Hill, NC, USA
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Fujioka S, Kitamura T, Mishima T, Nakajima R, Tamura Y, Horikoshi R, Araki H, Yakuwa K, Tomoyasu T, Okamura T, Miyamoto T, Torii S, Miyaji K. Gluteal Blood Flow Monitoring in Endovascular Aneurysm Repair With Internal Iliac Artery Embolization. Circ J 2021; 85:345-350. [PMID: 33597321 DOI: 10.1253/circj.cj-20-1002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND When an internal iliac artery (IIA) has to be embolized during endovascular aneurysm repair (EVAR), buttock claudication sometimes poses problems. However, there is no established method to evaluate intraoperative blood flow to the gluteal muscles.Methods and Results:Gluteal regional oxygen saturation (rSO2) was monitored using near-infrared spectroscopy (NIRS) during surgery, and changes in rSO2were compared with treatment results. Twenty-seven patients who underwent EVAR and IIA embolization at our institution between April 2019 and May 2020 were included in this study. The association between intraoperative changes in rSO2and postoperative incidence of buttock claudication was analyzed. Furthermore, the presence or absence of communication between the superior and inferior gluteal arteries and the intraoperative changes in rSO2were compared to ascertain whether rSO2reflects blood flow change. Postoperative buttock claudication occurred in 4 of 19 patients (21%) with unilateral occlusion of IIA and in 4 of 8 patients (50%) with bilateral occlusion of IIAs. rSO2was found to decrease significantly further in patients with buttock claudication than in patients without buttock claudication (-15±12% vs. -4±16%, P<0.05). In addition, rSO2was predominantly lower in patients without the communication between the superior and inferior gluteal arteries than in those with the communication. CONCLUSIONS Gluteal rSO2is useful as an indicator of intraoperative gluteal blood flow.
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Affiliation(s)
- Shunichiro Fujioka
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Tadashi Kitamura
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Toshiaki Mishima
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Riko Nakajima
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Yoshimi Tamura
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Rihito Horikoshi
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Haruna Araki
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Kazuki Yakuwa
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Takahiro Tomoyasu
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Toru Okamura
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Takashi Miyamoto
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Shinzo Torii
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
| | - Kagami Miyaji
- Department of Cardiovascular Surgery, Kitasato University School of Medicine
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Verhaeghe C, Lapage K, Moerman A. Quantitative assessment of cytochrome C oxidase patterns in muscle tissue by the use of near-infrared spectroscopy (NIRS) in healthy volunteers. J Clin Monit Comput 2021; 36:271-278. [PMID: 33459945 DOI: 10.1007/s10877-021-00648-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Accepted: 01/02/2021] [Indexed: 10/22/2022]
Abstract
Cytochrome C oxidase (CCO) acts as final electron acceptor in the respiratory chain, possibly providing information concerning cellular oxygenation. CCO is a chromophore with a broad absorption peak in the near-infrared spectrum in its reduced state (835 nm). However, this peak overlaps with deoxygenated haemoglobin (HHb; 755 nm) which is present in much higher concentrations. NIRO-300 measures CCO signals, but did not receive FDA approval for this use due to presumed lack of independency of the measured CCO changes. However, there is no proven evidence for this assumption. We hypothesized that the NIRO-300 provides a HHb independent measurement of CCO concentration changes. In this single-center crossover randomized controlled trial in healthy volunteers, subjects were randomized to receive arterial occlusion to the left arm and venous stasis on the right arm (n = 5) or vice versa (n = 5) during 5 min. After a resting period, the second part of the cross over study was performed. We placed the NIRO-300 optodes bilateral at the level of the brachioradial muscle in order to collect NIRS data continuously. Data was analysed using a generalized additive mixed model. HHb and CCO follow a significant different trend over time during the intervention period for both arterial occlusion (F = 20.645, edf = 3.419, p < 0.001) and venous stasis (F = 9.309, edf = 4.931, p < 0.001). Our data indicate that CCO concentration changes were not affected by HHb changes, thereby proving independency.Clinical trial registration: B670201732023 on June 28, 2017.
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Affiliation(s)
- Carl Verhaeghe
- Department of Anaesthesia, UZ Ghent, Corneel Heymanslaan 10, 9000, Ghent, Belgium.
| | - Koen Lapage
- Department of Anaesthesia, ASZ Aalst, Aalst, Belgium
| | - Anneliese Moerman
- Department of Anaesthesia, UZ Ghent, Corneel Heymanslaan 10, 9000, Ghent, Belgium
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Karlas A, Masthoff M, Kallmayer M, Helfen A, Bariotakis M, Fasoula NA, Schäfers M, Seidensticker M, Eckstein HH, Ntziachristos V, Wildgruber M. Multispectral optoacoustic tomography of peripheral arterial disease based on muscle hemoglobin gradients-a pilot clinical study. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:36. [PMID: 33553329 PMCID: PMC7859778 DOI: 10.21037/atm-20-3321] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 09/18/2020] [Indexed: 12/18/2022]
Abstract
BACKGROUND Current imaging assessment of peripheral artery disease (PAD) relies on anatomical cross-sectional visualizations of the affected arteries. Multispectral optoacoustic tomography (MSOT) is a novel molecular imaging technique that provides direct and label-free visualizations of soft tissue perfusion and oxygenation. METHODS MSOT was prospectively assessed in a pilot trial in healthy volunteers (group n1=4, mean age 31, 50% male and group n3=4, mean age 37.3, 75% male) and patients with intermittent claudication (group n2=4, mean age 72, 75% male, PAD stage IIb). We conducted cuff-induced ischemia (group n1) and resting state measurements (groups n2 and n3) over the calf region. Spatially resolved mapping of oxygenated (HbO2), deoxygenated (Hb) and total (THb) hemoglobin, as well as oxygen saturation (SO2), were measured via hand-held hybrid MSOT-Ultrasound based purely on hemoglobin contrast. RESULTS Calf measurements in healthy volunteers revealed distinct dynamics for HbO2, Hb, THb and SO2 under cuff-induced ischemia. HbO2, THb and SO2 levels were significantly impaired in PAD patients compared to healthy volunteers (P<0.05 for all parameters). Revascularization led to significant improvements in HbO2 of the affected limb. CONCLUSIONS Clinical MSOT allows for non-invasive, label-free and real-time imaging of muscle oxygenation in health and disease with implications for diagnostics and therapy assessment in PAD.
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Affiliation(s)
- Angelos Karlas
- Chair of Biological Imaging, School of Medicine, Technical University of Munich, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München (GmbH), Neuherberg, Germany
- Clinic of Vascular and Endovascular Surgery, Technical University of Munich, Klinikum rechts der Isar, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany
| | - Max Masthoff
- Department for Clinical Radiology, University Hospital Münster, Münster, Germany
| | - Michael Kallmayer
- Clinic of Vascular and Endovascular Surgery, Technical University of Munich, Klinikum rechts der Isar, Munich, Germany
| | - Anne Helfen
- Department for Clinical Radiology, University Hospital Münster, Münster, Germany
| | - Michail Bariotakis
- Chair of Biological Imaging, School of Medicine, Technical University of Munich, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München (GmbH), Neuherberg, Germany
| | - Nikolina Alexia Fasoula
- Chair of Biological Imaging, School of Medicine, Technical University of Munich, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München (GmbH), Neuherberg, Germany
| | - Michael Schäfers
- Department for Nuclear Medicine and European Institute for Molecular Imaging, University Hospital Münster, Münster, Germany
| | - Max Seidensticker
- Department for Radiology, University Hospital, LMU Munich, München, Germany
| | - Hans-Henning Eckstein
- Clinic of Vascular and Endovascular Surgery, Technical University of Munich, Klinikum rechts der Isar, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany
| | - Vasilis Ntziachristos
- Chair of Biological Imaging, School of Medicine, Technical University of Munich, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München (GmbH), Neuherberg, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany
| | - Moritz Wildgruber
- Department for Clinical Radiology, University Hospital Münster, Münster, Germany
- Department for Radiology, University Hospital, LMU Munich, München, Germany
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Pirovano I, Porcelli S, Re R, Spinelli L, Contini D, Marzorati M, Torricelli A. Effect of adipose tissue thickness and tissue optical properties on the differential pathlength factor estimation for NIRS studies on human skeletal muscle. BIOMEDICAL OPTICS EXPRESS 2021; 12:571-587. [PMID: 33659090 PMCID: PMC7899498 DOI: 10.1364/boe.412447] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 12/04/2020] [Accepted: 12/13/2020] [Indexed: 06/12/2023]
Abstract
We propose a quantitative and systematic investigation of the differential pathlength factor (DPF) behavior for skeletal muscles and its dependence on different factors, such as the subcutaneous adipose tissue thickness (ATT), the variations of the tissue absorption (µa ) and reduced scattering (µ's ) coefficients, and the source-detector distance. A time domain (TD) NIRS simulation study is performed in a two-layer geometry mimicking a human skeletal muscle with an overlying adipose tissue layer. The DPF decreases when µa increases, while it increases when µ's increases. Moreover, a positive correlation between DPF and ATT is found. These results are supported by an in-vivo TD NIRS study on vastus lateralis and biceps brachii muscles of eleven subjects at rest, showing a high inter-subject and inter-muscle variability.
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Affiliation(s)
| | - Simone Porcelli
- Istituto di Tecnologie Biomediche, Consiglio Nazionale delle Ricerche, Segrate, Milan, Italy
- Dipartimento di Medicina Molecolare, Università di Pavia, Pavia, Italy
| | - Rebecca Re
- Dipartimento di Fisica, Politecnico di Milano, Milan, Italy
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Milan, Italy
| | - Lorenzo Spinelli
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Milan, Italy
| | - Davide Contini
- Dipartimento di Fisica, Politecnico di Milano, Milan, Italy
| | - Mauro Marzorati
- Istituto di Tecnologie Biomediche, Consiglio Nazionale delle Ricerche, Segrate, Milan, Italy
| | - Alessandro Torricelli
- Dipartimento di Fisica, Politecnico di Milano, Milan, Italy
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Milan, Italy
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63
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Zhang C, McCully KK. The Case for Measuring Long Bone Hemodynamics With Near-Infrared Spectroscopy. Front Physiol 2020; 11:615977. [PMID: 33391034 PMCID: PMC7775486 DOI: 10.3389/fphys.2020.615977] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Accepted: 11/30/2020] [Indexed: 01/12/2023] Open
Abstract
Diseases and associated fragility of bone is an important medical issue. There is increasing evidence that bone health is related to blood flow and oxygen delivery. The development of non-invasive methods to evaluate bone blood flow and oxygen delivery promise to improve the detection and treatment of bone health in human. Near-infrared spectroscopy (NIRS) has been used to evaluate oxygen levels, blood flow, and metabolism in skeletal muscle and brain. While the limited penetration depth of NIRS restricts its application, NIRS studies have been performed on the medial aspect of the tibia and some other prominent bone sites. Two approaches using NIRS to evaluate bone health are discussed: (1) the rate of re-oxygenation of bone after a short bout of ischemia, and (2) the dynamics of oxygen levels during an intervention such as resistance exercise. Early studies have shown these approaches to have the potential to evaluate bone vascular health as well as the predicted efficacy of an intervention before changes in bone composition are detectable. Future studies are needed to fully develop and exploit the use of NIRS technology for the study of bone health.
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Affiliation(s)
- Chuan Zhang
- Department of Kinesiology, University of Georgia, Athens, GA, United States
| | - Kevin K McCully
- Department of Kinesiology, University of Georgia, Athens, GA, United States
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Theodorakopoulou MP, Schoina M, Sarafidis P. Assessment of Endothelial and Microvascular Function in CKD: Older and Newer Techniques, Associated Risk Factors, and Relations with Outcomes. Am J Nephrol 2020; 51:931-949. [PMID: 33311014 DOI: 10.1159/000512263] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 10/12/2020] [Indexed: 12/17/2022]
Abstract
BACKGROUND Endothelium is the inner cellular lining of the vessels that modulates multiple biological processes including vasomotor tone, permeability, inflammatory responses, hemostasis, and angiogenesis. Endothelial dysfunction, the basis of atherosclerosis, is characterized by an imbalance between endothelium-derived relaxing factors and endothelium-derived contracting factors. SUMMARY Starting from the semi-invasive venous occlusion plethysmography, several functional techniques have been developed to evaluate microvascular function and subsequently used in patients with CKD. Flow-mediated dilatation of the forearm is considered to be the "gold standard," while in the last years, novel, noninvasive methods such as laser speckle contrast imaging and near-infrared spectroscopy are scarcely used. Moreover, several circulating biomarkers of endothelial function have been used in studies in CKD patients. This review summarizes available functional methods and biochemical markers for the assessment of endothelial and microvascular function in CKD and discusses existing evidence on their associations with comorbid conditions and outcomes in this population. Key Messages: Accumulated evidence suggests that endothelial dysfunction occurs early in CKD and is associated with target organ damage, progression of renal injury, cardiovascular events, and mortality. Novel methods evaluating microvascular function can offer a detailed, real-time assessment of underlying phenomena and should be increasingly used to shed more light on the role of endothelial dysfunction on cardiovascular and renal disease progression in CKD.
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Affiliation(s)
- Marieta P Theodorakopoulou
- Department of Nephrology, Hippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Maria Schoina
- Department of Nephrology, Hippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Pantelis Sarafidis
- Department of Nephrology, Hippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece,
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Scano A, Pirovano I, Manunza ME, Spinelli L, Contini D, Torricelli A, Re R. Sustained fatigue assessment during isometric exercises with time-domain near infrared spectroscopy and surface electromyography signals. BIOMEDICAL OPTICS EXPRESS 2020; 11:7357-7375. [PMID: 33409002 PMCID: PMC7747893 DOI: 10.1364/boe.403976] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 11/18/2020] [Accepted: 11/18/2020] [Indexed: 06/12/2023]
Abstract
The effect of sustained fatigue during an upper limb isometric exercise is presented to investigate a group of healthy subjects with simultaneous time-domain (TD) NIRS and surface electromyography (sEMG) recordings on the deltoid lateralis muscle. The aim of the work was to understand which TD-NIRS parameters can be used as descriptors for sustained muscular fatigue, focusing on the slow phase of this process and using median frequency (MF) computed from sEMG as gold standard measure. It was found that oxygen saturation and deoxy-hemoglobin are slightly better descriptors of sustained fatigue, than oxy-hemoglobin, since they showed a higher correlation with MF, while total-hemoglobin correlation with MF was lower.
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Affiliation(s)
- A. Scano
- Istituto di Sistemi e Tecnologie Industriali Intelligenti per il Manifatturiero Avanzato (STIIMA), Consiglio Nazionale delle Ricerche, Via Previati 1/E Lecco, Italy e Via Alfonso Corti 12, Milan, Italy
| | - I. Pirovano
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milan, Italy
| | - M. E. Manunza
- Istituto di Sistemi e Tecnologie Industriali Intelligenti per il Manifatturiero Avanzato (STIIMA), Consiglio Nazionale delle Ricerche, Via Previati 1/E Lecco, Italy e Via Alfonso Corti 12, Milan, Italy
| | - L. Spinelli
- Istituto di Fotonica e Nanotecnologie (IFN), Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, Milan, Italy
| | - D. Contini
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milan, Italy
| | - A. Torricelli
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milan, Italy
- Istituto di Fotonica e Nanotecnologie (IFN), Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, Milan, Italy
| | - R. Re
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milan, Italy
- Istituto di Fotonica e Nanotecnologie (IFN), Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, Milan, Italy
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Moro C, Stromberga Z, Moreland A. Enhancing Teaching in Biomedical, Health and Exercise Science with Real-Time Physiological Visualisations. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1260:1-11. [PMID: 33211304 DOI: 10.1007/978-3-030-47483-6_1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Muscle physiology constitutes a core curriculum for students and researchers within biomedical, health and exercise science disciplines. The variations between skeletal and smooth muscle, mechanisms underlying excitation-contraction coupling, as well as the relationships between muscle anatomy and physiology are commonly taught from illustrations, static models or textbooks. However, this does not necessarily provide students with the required comprehension surrounding the dynamic nature of muscle contractions or neuromuscular activities. This chapter will explore alternative methods of visualising skeletal and smooth muscle physiology in real-time. Various recording hardware, isolated tissues bath experiments, neurophysiological applications and computer-based software will be discussed to provide an overview of the evidence-based successes and case studies for using these techniques when assisting students with their understanding of the complex mechanisms underlying muscle contractions.
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Affiliation(s)
- Christian Moro
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, Australia.
| | - Zane Stromberga
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, Australia
| | - Ashleigh Moreland
- School of Health and Biomedical Sciences, RMIT University, Melbourne, Australia
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Verratti V, Bondi D, Mulliri G, Ghiani G, Crisafulli A, Pietrangelo T, Marinozzi ME, Cerretelli P. Muscle Oxygen Delivery in the Forearm and in the Vastus Lateralis Muscles in Response to Resistance Exercise: A Comparison Between Nepalese Porters and Italian Trekkers. Front Physiol 2020; 11:607616. [PMID: 33240112 PMCID: PMC7683416 DOI: 10.3389/fphys.2020.607616] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 10/19/2020] [Indexed: 12/25/2022] Open
Abstract
Altitude ascending represents an intriguing experimental model reproducing physiological and pathophysiological conditions sharing hypoxemia as the denominator. The aim of the present study was to investigate fractional oxygen extraction and blood dynamics in response to hypobaric hypoxia and to acute resistance exercises, taking into account several factors including different ethnic origin and muscle groups. As part of the “Kanchenjunga Exploration & Physiology” project, six Italian trekkers and six Nepalese porters took part in a high altitude trek in the Himalayas. The measurements were carried out at low (1,450 m) and high altitude (HA; 4,780 m). Near-infrared spectroscopy (NIRS)-derived parameters, i.e., Tot-Hb and tissue saturation index (TSI), were gathered at rest and after bouts of 3-min resistive exercise, both in the quadriceps and in the forearm muscles. TSI decreased with altitude, particularly in forearm muscles (from 66.9 to 57.3%), whereas the decrement was less in the quadriceps (from 62.5 to 57.2%); Nepalese porters were characterized by greater values in thigh TSI than Italian trekkers. Tot-Hb was increased after exercise. At altitude, such increase appeared to be higher in the quadriceps. This effect might be a consequence of the long-term adaptive memory due to the frequent exposures to altitude. Although speculative, we suggest a long-term adaptation of the Nepalese porters due to improved oxygenation of muscles frequently undergoing hypoxic exercise. Muscle structure, individual factors, and altitude exposure time should be taken into account to move on the knowledge of oxygen delivery and utilization at altitude.
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Affiliation(s)
- Vittore Verratti
- Department of Psychological, Health and Territorial Sciences, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy
| | - Danilo Bondi
- Department of Neuroscience, Imaging and Clinical Sciences, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy
| | - Gabriele Mulliri
- Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
| | - Giovanna Ghiani
- Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
| | - Antonio Crisafulli
- Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
| | - Tiziana Pietrangelo
- Department of Neuroscience, Imaging and Clinical Sciences, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy
| | | | - Paolo Cerretelli
- Institute of Bioimaging and Molecular Physiology, National Research Council of Italy, Segrate, Italy
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Direct postoperative protein S100B and NIRS monitoring in infants after pediatric cardiac surgery enrich early mortality assessment at the PICU. Heart Lung 2020; 49:731-736. [PMID: 32896683 DOI: 10.1016/j.hrtlng.2020.08.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 07/28/2020] [Accepted: 08/18/2020] [Indexed: 11/23/2022]
Abstract
BACKGROUND Neuromonitoring using plasmatic biomarkers such as S100B and near-infrared spectroscopy (NIRS) represents a standard procedure for detecting cerebral damage after cardiac surgery. Their use in pediatric clinical assessment, however, is negligible. OBJECTIVES The goal of this study was to evaluate the predictive role of S100B levels and cerebral oxygenation in postoperative pediatric cardiac patients for survival and potential cerebral injuries. METHODS A retrospective cohort study of infants after cardiac surgery. Primary outcome was survival until discharge. Intra/postoperative vital signs and laboratory data were measured and statistically analyzed. RESULTS Seven out of 226 infants were non-survivors. Non-survivors had significantly lower cerebral saturation than survivors, as well as elevated S100B values at admission, associated with lower arterial pressure and higher serum lactate levels. CONCLUSION Although significant differences of S100B and crO2 values between survivors and non-survivors were found, no critical thresholds could be established from the data. Nevertheless, changes from the norm in these parameters should raise awareness for critical clinical development.
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Influence of sprint exercise on aortic pulse wave velocity and femoral artery shear patterns. Eur J Appl Physiol 2020; 120:2635-2647. [PMID: 32880701 DOI: 10.1007/s00421-020-04483-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 08/25/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE Aortic stiffness may affect shear patterns in the peripheral vasculature. This study examined if sprint exercise, which typically increases aortic stiffness is associated with increased peripheral retrograde blood flow and impaired microvascular function. METHODS Twenty participants (10 women; age: 27 ± 5 years) underwent arterial stiffness, shear rate, and microvascular function assessment at three time points: baseline; following time control; ~ 2 min post a 30-s cycle ergometer sprint against 7.0% body mass. Aortic stiffness was assessed using carotid-femoral pulse wave velocity (cfPWV). Superficial femoral artery (SFA) diameter and blood velocity were assessed using Doppler-ultrasound and were used to calculate shear rates and resistance index (RI). SFA wave reflections were obtained via wave intensity analysis. Vastus medialis microvascular function was measured as tissue saturation index reactivity pre-post exercise via near-infrared spectroscopy. RESULTS cfPWV increased by + 0.8 ± 0.7 m·s-1 following exercise (p < 0.001). Retrograde shear was reduced following exercise compared with time control (- 4.9 ± 3.8 s-1; p < 0.001), while tissue saturation index was increased post-exercise from baseline (+ 2.3 ± 4.6%; p = 0.04). Reductions in SFA wave reflections (- 1.70 ± 1.96 aU) and RI (- 0.17 ± 0.13 aU) were also noted following exercise (p < 0.001). CONCLUSION These data suggest sprint exercise-mediated changes in peripheral shear patterns and microvascular function in the exercised vasculature occur independent from increases in aortic stiffness. Exercise-induced reductions in SFA retrograde shear may be related to decreased wave reflections and peripheral vascular resistance.
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Development of a real-time blood damage monitoring device for cardiopulmonary bypass system using near-infrared spectroscopy. Lasers Med Sci 2020; 36:783-790. [PMID: 32651700 DOI: 10.1007/s10103-020-03094-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 06/29/2020] [Indexed: 10/23/2022]
Abstract
The optical properties of hemoglobin could indicate the degree of hemolysis. We aimed to utilize this to develop a real-time blood damage monitoring device for cardiopulmonary bypass (CPB) systems. The real-time blood damage monitoring device comprised a near-infrared spectroscopy optical module with a fiber spectrometer and monitoring platform and computer software developed using LabVIEW 2017. The fiber spectrometer operated at wavelengths of 545, 660, and 940 nm and contained a detector fiber bundle (source-detector distance = 1.0-2.5 cm). CPB operation was simulated using an artificial heart-lung machine with a flow rate of 3, 4, or 5 L/min. Four hundred milliliter of anticoagulated porcine blood was continuously rotated for 4 h. The transmittance, reflectivity, and absorbance of the blood were measured using the optical device at a frequency of 25 Hz and then digitally averaged into 1-s interval. Samples of damaged blood were collected at regular intervals for in vitro hemolysis tests to calculate the normalized index of hemolysis (NIH). All experiments were repeated three times. We prepared 28 blood bags containing 400 ml of anticoagulant. Paired t test was used to examine the test-retest reliability of the differences between the three methods and control samples. Statistical tests revealed significant differences in the mean values between the test and control groups over time (P < 0.01). Relationship was established between the real-time monitoring results and the NIH values. An effective blood damage detection method that combined in vitro hemolysis tests and near-infrared spectroscopy was achieved. The results demonstrate the clinical potential of a real-time, low-cost, and reliable blood damage monitoring device to improve the safety of CPB operation.
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71
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Stephens SL, Selkow NM, Hoffman NL. Dry Cupping Therapy for Improving Nonspecific Neck Pain and Subcutaneous Hemodynamics. J Athl Train 2020; 55:682-690. [PMID: 32556324 DOI: 10.4085/1062-6050-236-19] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
CONTEXT Dry cupping therapy is a noninvasive treatment commonly used to reduce pain and promote the healing process in various populations, including those with nonspecific neck pain; however, no data are available to support most of this method's true physiological benefits. OBJECTIVE To determine if dry cupping therapy decreased pain and increased subcutaneous blood flow compared with sham cupping and control conditions. DESIGN Controlled laboratory study. SETTING Laboratory. PATIENTS OR OTHER PARTICIPANTS A total of 32 participants (age = 22.5 ± 2.8 years, height = 173.3 ± 10.1 cm, mass = 76.6 ± 18.7 kg) with self-reported nonspecific neck pain. INTERVENTION(S) We used dry cupping and sham cupping interventions and a control condition. For the dry cupping intervention, 1 stationary cup was placed directly over the most painful area for 8 minutes. The sham cupping intervention followed the same procedures as the dry cupping intervention except a sham cup was applied. For the control condition, participants received no treatment. MAIN OUTCOME MEASURE(S) Subjective pain intensity (visual analog scale); pain-pressure threshold; subcutaneous hemodynamics, including superficial and deep oxygenated, deoxygenated, and total hemoglobin levels; and tissue saturation index. RESULTS We observed differences in the visual analog scale score and the superficial and deep oxygenated and total hemoglobin levels (P values ≤ .002) immediately postintervention compared with baseline. Post hoc tests revealed that the dry cupping group had less pain than the sham cupping and control groups and higher superficial and deep oxygenated and total hemoglobin levels (P values ≤ .008). No differences were found between baseline and 24 hours postintervention. CONCLUSIONS A single session of dry cupping therapy may be an effective short-term treatment method for immediately reducing pain and increasing oxygenated and total hemoglobin levels in patients with nonspecific neck pain.
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Affiliation(s)
| | - Noelle M Selkow
- School of Kinesiology and Recreation, Illinois State University, Normal
| | - Nicole L Hoffman
- School of Kinesiology and Recreation, Illinois State University, Normal
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Fox CD, Garner CT, Mumford PW, Beck DT, Roberts MD. Higher doses of a green tea-based supplement increase post-exercise blood flow following an acute resistance exercise bout in recreationally resistance-trained college-aged men. J Int Soc Sports Nutr 2020; 17:27. [PMID: 32460790 PMCID: PMC7254661 DOI: 10.1186/s12970-020-00358-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 05/19/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND There are animal data suggesting green tea can enhance blood flow. However, human data are lacking. Thus, the purpose of this study was to examine the acute effects of low and high doses of a green tea-based supplement (GBS) on brachial artery blood flow before and following a resistance exercise bout. METHODS In this, double-blinded placebo-controlled trial, college-aged males (n = 18) who self-reported recreationally resistance training for the previous 6 ± 3 years were assigned to one of two studies including a low (300 mg serving) (n = 9) or high dose (600 mg serving) (n = 8; 1 drop) GBS study. During testing sessions, participants reported to the laboratory following an overnight fast and rested in a supine position for 15 min. Thereafter, baseline measurements for resting heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), brachial artery diameter (BAD) and blood flow (BBF) were obtained (PRE). Participants then consumed either their respective GBS dose or a similar placebo dose (microcrystalline cellulose) in a supine resting state. HR, SBP, DBP, BAD and BBF were measured 45 min after placebo or GBS ingestion (PRE2). Participants were then placed in a recumbent position and performed 4 sets of 10 arm curl repetitions using an 11 kg dumbbell. Participants returned to a supine position and HR, SBP, DBP, BAD and BBF were obtained within the first 3 min following exercise (POST), 15 min after exercise (15POST), and 45 min after exercise (45POST). Participants returned to the laboratory 24-48 h later to repeat the same protocol with either GBS or the placebo depending on randomization. Two-way (supplement x time) repeated measures ANOVAs were used to compare dependent variables between testing sessions for Study 1 (300 mg of GBS and placebo) and Study 2 (600 mg of GBS and placebo), and statistical significance was set at p < 0.05. No statistical comparisons were made between studies. RESULTS As expected, exercise increased BAD and BBF compared to resting baseline measured irrespective of supplementation. In addition, BAD and BBF did not differ between GBS and placebo at any time point after exercise in Study 1. In study 2, however, 600 mg GBS increased baseline-normalized BBF at immediately post exercise compared to placebo (placebo = 211 ± 155% increase, GBS = 349 ± 156% increase; p = 0.012) but not BAD. CONCLUSIONS These data suggest a higher dose of GBS can enhance localized blood flow acutely following a resistance exercise bout. However, the long-term implications of these data are unclear, and more well-powered studies are needed to validate efficacy and elucidate potential mechanisms.
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Affiliation(s)
- Carlton D Fox
- Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, 301 Wire Road, Office 286, Auburn, AL, 36849, USA
| | - Christian T Garner
- Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, 301 Wire Road, Office 286, Auburn, AL, 36849, USA
| | - Petey W Mumford
- Exercise and Performance Nutrition Laboratory, School of Health Sciences, Lindenwood University, Saint Charles, MO, USA
| | - Darren T Beck
- Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, 301 Wire Road, Office 286, Auburn, AL, 36849, USA.,Edward Via College of Osteopathic Medicine Auburn, Auburn, AL, USA
| | - Michael D Roberts
- Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, 301 Wire Road, Office 286, Auburn, AL, 36849, USA. .,Edward Via College of Osteopathic Medicine Auburn, Auburn, AL, USA.
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Exercise-Induced Hemodynamic Changes in Muscle Tissue: Implication of Muscle Fatigue. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10103512] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This research aims to investigate the development of muscle fatigue and the recovery process revealed by tissue oxygenation. The tissue hemodynamics were measured by near-infrared spectroscopy (NIRS) during a 30-min pre-exercise rest, a 40-cycle heel-lift exercise and a 30-min post-exercise recovery. Wavelet transform was used to obtain the normalized wavelet energy in six frequency intervals (I–VI) and inverse wavelet transform was applied to extract exercise-induced oscillations from the hemodynamic signals. During the exercise phase, the contraction-related oscillations in the total hemoglobin signal (ΔtHb) showed a decreasing trend while the fluctuations in the tissue oxygenation index (TOI) displayed an increasing tendency. The mean TOI value was significantly higher (p < 0.001) under recovery (65.04% ± 2.90%) than that under rest (62.35% ± 3.05%). The normalized wavelet energy of the ΔtHb signal in frequency intervals I (p < 0.001), II (p < 0.05), III (p < 0.05) and IV (p < 0.01) significantly increased by 43.4%, 23.6%, 18.4% and 21.6% during the recovery than that during the pre-exercise rest, while the value in interval VI (p < 0.05) significantly decreased by 16.6%. It could be concluded that NIRS-derived hemodynamic signals can provide valuable information related to muscle fatigue and recovery.
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Manfredini F, Lamberti N, Ficarra V, Tsolaki E, Straudi S, Zamboni P, Basaglia N, Gasbarro V. Biomarkers of Muscle Metabolism in Peripheral Artery Disease: A Dynamic NIRS-Assisted Study to Detect Adaptations Following Revascularization and Exercise Training. Diagnostics (Basel) 2020; 10:diagnostics10050312. [PMID: 32429406 PMCID: PMC7277989 DOI: 10.3390/diagnostics10050312] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/11/2020] [Accepted: 05/14/2020] [Indexed: 12/12/2022] Open
Abstract
We assessed whether muscle metabolism biomarkers (MMb) identified by near-infrared spectroscopy (NIRS) are valid for determining adaptations following revascularization or exercise training in peripheral artery disease (PAD). Eighteen patients (males n = 13; 69 ± 7 years) were randomized to receive revascularization (Rev = 6) or pain-free home-based exercise (Ex = 12). MMb were safely collected via a NIRS-assisted treadmill test as area-under-curve for the spectra of oxygenated (-oxy), deoxygenated (-deoxy), differential (-diff) and total (-tot) hemoglobin traces. MMb, ankle–brachial index (ABI), pain-free (PFWD) and 6-min (6MWD) walking distances were assessed at baseline and after four months. MMb were correlated at baseline with ABI (MMb-oxy r = 0.46) and 6MWD (MMb-tot r = 0.51). After treatments, MMb-oxy showed an expected increase, which was more relevant for Rev group than the Ex (56% vs. 20%), with trends towards normalization for the other MMb. These changes were significantly correlated with variations in ABI (MMb-oxy r = 0.71; p = 0.002) and 6MWD (MMb-tot r = 0.58; p = 0.003). The MMb-diff in Rev group and MMb-deoxy in Ex group at baseline predicted clinical outcomes being correlated with PFWD improvements after 4-month (r = −0.94; p = 0.005 and r = −0.57; p = 0.05, respectively). A noninvasive NIRS-based test, feasible in a clinical setting, identified muscle metabolism biomarkers in PAD. The novel MMb were associated with validated outcome measures, selectively modified after different interventions and able to predict long-term functional improvements after surgery or exercise training.
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Affiliation(s)
- Fabio Manfredini
- Section of Sports Sciences, Department of Biomedical and Surgical Specialties Sciences, University of Ferrara, Italy–Via Luigi Borsari 46, 44121 Ferrara, Italy;
- Unit of Physical Medicine and Rehabilitation, Department of Neurosciences/Rehabilitation, University Hospital of Ferrara, Via Aldo Moro 8, 44124 Ferrara, Italy; (S.S.); (N.B.)
- Correspondence: ; Tel.: +39-0532-236187
| | - Nicola Lamberti
- Section of Sports Sciences, Department of Biomedical and Surgical Specialties Sciences, University of Ferrara, Italy–Via Luigi Borsari 46, 44121 Ferrara, Italy;
| | - Valentina Ficarra
- Unit of Vascular and Endovascular Surgery, University Hospital of Ferrara, Via Aldo Moro 8, 44124 Ferrara, Italy; (V.F.); (E.T.); (V.G.)
| | - Elpiniki Tsolaki
- Unit of Vascular and Endovascular Surgery, University Hospital of Ferrara, Via Aldo Moro 8, 44124 Ferrara, Italy; (V.F.); (E.T.); (V.G.)
| | - Sofia Straudi
- Unit of Physical Medicine and Rehabilitation, Department of Neurosciences/Rehabilitation, University Hospital of Ferrara, Via Aldo Moro 8, 44124 Ferrara, Italy; (S.S.); (N.B.)
| | - Paolo Zamboni
- Vascular Diseases Center, University of Ferrara, Italy–Via Aldo Moro 8, 44124 Ferrara, Italy;
| | - Nino Basaglia
- Unit of Physical Medicine and Rehabilitation, Department of Neurosciences/Rehabilitation, University Hospital of Ferrara, Via Aldo Moro 8, 44124 Ferrara, Italy; (S.S.); (N.B.)
| | - Vincenzo Gasbarro
- Unit of Vascular and Endovascular Surgery, University Hospital of Ferrara, Via Aldo Moro 8, 44124 Ferrara, Italy; (V.F.); (E.T.); (V.G.)
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75
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ter Beek F, Jokumsen PS, Sloth BN, Stevenson AJT, Larsen RG. Ischemic Preconditioning Attenuates Rating of Perceived Exertion But Does Not Improve Maximal Oxygen Consumption or Maximal Power Output. J Strength Cond Res 2020; 36:2479-2485. [DOI: 10.1519/jsc.0000000000003625] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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76
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Near-infrared spectroscopy-derived muscle oxygen saturation during exercise recovery and flow-mediated dilation are impaired in HIV-infected patients. Microvasc Res 2020; 130:104004. [PMID: 32234365 DOI: 10.1016/j.mvr.2020.104004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 03/18/2020] [Accepted: 03/25/2020] [Indexed: 12/17/2022]
Abstract
Highly active antiretroviral therapy has been associated with the presence of endothelial dysfunction in HIV-infected patients, which may impair oxygen delivery to muscles during exercise and exercise recovery. Near-infrared spectroscopy (NIRS) has been used to assess muscle oxygen saturation (SmO2) kinetics during exercise in different clinical populations in order to evaluate the balance between oxygen delivery and utilization by muscles. However, studies assessing SmO2 in HIV-infected patients have not been conducted. Therefore, the aim of the study was to evaluate NIRS-derived SmO2 during rhythmic handgrip exercise and flow-mediated dilation (FMD) in HIV-infected patients (HIV) compared to non-HIV-infected controls (N-HIV). Eighteen HIV and 17 N-HIV individuals underwent FMD assessment by ultrasound. The subjects then performed one set of rhythmic handgrip exercise until fatigue at 30% maximal isometric voluntary contraction. SmO2 was measured during entire exercise and 2-min exercise 3recovery. Muscle oxygen resaturation rate (upslope of the SmO2 over 10 s of recovery) was calculated. A significant lower FMD (3.5 ± 1.7 vs 5.9 ± 1.5%, P < 0.001) and slower oxygen resaturation rate (0.78 ± 0.4 vs 1.14 ± 0.4%·s-1, P = 0.020) in HIV as compared to N-HIV group were observed. In conclusion, our findings demonstrated that HIV-infected patients had reduced FMD and impaired muscle oxygenation during exercise recovery compared to non-HIV individuals.
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77
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Tam E, Bruseghini P, Capelli C, Baraldo M, Chiamulera C, Zandonai T. Effects of nicotine on microvascular responsiveness after nicotine satiety versus overnight nicotine abstinence. Vasc Med 2020; 25:223-225. [PMID: 32202231 DOI: 10.1177/1358863x20906029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Enrico Tam
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Paolo Bruseghini
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Carlo Capelli
- Department of Physical Performances, Norwegian School of Sport Sciences, Oslo, Norway
| | | | - Cristiano Chiamulera
- Neuropsychopharmacology Lab, Department of Diagnostic and Public Health, University of Verona, Verona, Italy
| | - Thomas Zandonai
- Department of Experimental Psychology, Mind, Brain and Behaviour Research Centre, Faculty of Psychology, University of Granada, Granada, Spain.,Alicante Institute for Health and Biomedical Research, ISABIAL-FISABIO Foundation, Neuropharmacology on Pain, Miguel Hernández University, Elche, Alicante, Spain
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78
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Baláš J, Kodejška J, Krupková D, Giles D. Males benefit more from cold water immersion during repeated handgrip contractions than females despite similar oxygen kinetics. J Physiol Sci 2020; 70:13. [PMID: 32138641 PMCID: PMC7058574 DOI: 10.1186/s12576-020-00742-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 02/24/2020] [Indexed: 11/16/2022]
Abstract
The purpose of the present study was to assess the effect of different water immersion temperatures on handgrip performance and haemodynamic changes in the forearm flexors of males and females. Twenty-nine rock-climbers performed three repeated intermittent handgrip contractions to failure with 20 min recovery on three separate laboratory visits. For each visit, a randomly assigned recovery strategy was applied: cold water immersion (CWI) at 8 °C (CW8), 15 °C (CW15) or passive recovery (PAS). While handgrip performance significantly decreased in the subsequent trials for the PAS (p < 0.05), there was a significant increase in time to failure for the second and third trial for CW15 and in the second trial for CW8; males having greater performance improvement (44%) after CW15 than females (26%). The results indicate that CW15 was a more tolerable and effective recovery strategy than CW8 and the same CWI protocol may lead to different recovery in males and females.
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Affiliation(s)
- Jiří Baláš
- Faculty of Physical Education and Sport, Charles University Prague, José Martího 31, 16252, Prague 6, Czech Republic.
| | - Jan Kodejška
- Faculty of Physical Education and Sport, Charles University Prague, José Martího 31, 16252, Prague 6, Czech Republic
| | - Dominika Krupková
- Faculty of Physical Education and Sport, Charles University Prague, José Martího 31, 16252, Prague 6, Czech Republic
| | - David Giles
- Lattice Training Ltd., Chesterfield, Derbyshire, UK
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Jones S, Tillin T, Williams S, Eastwood SV, Hughes AD, Chaturvedi N. Type 2 diabetes does not account for ethnic differences in exercise capacity or skeletal muscle function in older adults. Diabetologia 2020; 63:624-635. [PMID: 31820039 PMCID: PMC6997264 DOI: 10.1007/s00125-019-05055-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 10/29/2019] [Indexed: 01/14/2023]
Abstract
AIMS/HYPOTHESIS The aim of this study was to compare exercise capacity, strength and skeletal muscle perfusion during exercise, and oxidative capacity between South Asians, African Caribbeans and Europeans, and determine what effect ethnic differences in the prevalence of type 2 diabetes has on these functional outcomes. METHODS In total, 708 participants (aged [mean±SD] 73 ± 7 years, 56% male) were recruited from the Southall and Brent Revisited (SABRE) study, a UK population-based cohort comprised of Europeans (n = 311) and South Asian (n = 232) and African Caribbean (n = 165) migrants. Measurements of exercise capacity using a 6 min stepper test (6MST), including measurement of oxygen consumption ([Formula: see text]) and grip strength, were performed. Skeletal muscle was assessed using near infrared spectroscopy (NIRS); measures included changes in tissue saturation index (∆TSI%) with exercise and oxidative capacity (muscle oxygen consumption recovery, represented by a time constant [τ]). Analysis was by multiple linear regression. RESULTS When adjusted for age and sex, in South Asians and African Caribbeans, exercise capacity was reduced compared with Europeans ([Formula: see text] [ml min-1 kg-1]: β = -1.2 [95% CI -1.9, -0.4], p = 0.002, and β -1.7 [95% CI -2.5, -0.8], p < 0.001, respectively). South Asians had lower and African Caribbeans had higher strength compared with Europeans (strength [kPa]: β = -9 [95% CI -12, -6), p < 0.001, and β = 6 [95% CI 3, 9], p < 0.001, respectively). South Asians had greater decreases in TSI% and longer τ compared with Europeans (∆TSI% [%]: β = -0.9 [95% CI -1.7, -0.1), p = 0.024; τ [s]: β = 11 [95% CI 3, 18], p = 0.006). Ethnic differences in [Formula: see text] and grip strength remained despite adjustment for type 2 diabetes or HbA1c (and fat-free mass for grip strength). However, the differences between Europeans and South Asians were no longer statistically significant after adjustment for other possible mediators or confounders (including physical activity, waist-to-hip ratio, cardiovascular disease or hypertension, smoking, haemoglobin levels or β-blocker use). The difference in ∆TSI% between Europeans and South Asians was marginally attenuated after adjustment for type 2 diabetes or HbA1c and was also no longer statistically significant after adjusting for other confounders; however, τ remained significantly longer in South Asians vs Europeans despite adjustment for all confounders. CONCLUSIONS/INTERPRETATION Reduced exercise capacity in South Asians and African Caribbeans is unexplained by higher rates of type 2 diabetes. Poorer exercise tolerance in these populations, and impaired muscle function and perfusion in South Asians, may contribute to the higher morbidity burden of UK ethnic minority groups in older age.
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Affiliation(s)
- Siana Jones
- MRC Unit for Lifelong Health and Ageing at UCL, Department of Population Science and Experimental Medicine, Institute of Cardiovascular Science, University College London, Gower Street, London, WC1E 6BT, UK.
| | - Therese Tillin
- MRC Unit for Lifelong Health and Ageing at UCL, Department of Population Science and Experimental Medicine, Institute of Cardiovascular Science, University College London, Gower Street, London, WC1E 6BT, UK
| | - Suzanne Williams
- MRC Unit for Lifelong Health and Ageing at UCL, Department of Population Science and Experimental Medicine, Institute of Cardiovascular Science, University College London, Gower Street, London, WC1E 6BT, UK
| | - Sophie V Eastwood
- MRC Unit for Lifelong Health and Ageing at UCL, Department of Population Science and Experimental Medicine, Institute of Cardiovascular Science, University College London, Gower Street, London, WC1E 6BT, UK
| | - Alun D Hughes
- MRC Unit for Lifelong Health and Ageing at UCL, Department of Population Science and Experimental Medicine, Institute of Cardiovascular Science, University College London, Gower Street, London, WC1E 6BT, UK
| | - Nishi Chaturvedi
- MRC Unit for Lifelong Health and Ageing at UCL, Department of Population Science and Experimental Medicine, Institute of Cardiovascular Science, University College London, Gower Street, London, WC1E 6BT, UK
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80
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Passive smoking acutely affects the microcirculation in healthy non-smokers. Microvasc Res 2020; 128:103932. [DOI: 10.1016/j.mvr.2019.103932] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 08/31/2019] [Accepted: 09/26/2019] [Indexed: 02/02/2023]
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81
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Fantini S, Blaney G, Sassaroli A. Transformational change in the field of diffuse optics: From going bananas to going nuts. JOURNAL OF INNOVATIVE OPTICAL HEALTH SCIENCES 2020; 13:1930013. [PMID: 36340430 PMCID: PMC9632641 DOI: 10.1142/s1793545819300131] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The concept of region of sensitivity is central to the field of diffuse optics and is closely related to the Jacobian matrix used to solve the inverse problem in imaging. It is well-known that, in diffuse reflectance, the region of sensitivity associated with a given source-detector pair is shaped as a banana, and features maximal sensitivity to the portions of the sample that are closest to the source and the detector. We have recently introduced a dual-slope method based on a special arrangement of two sources and two detectors, which results in deeper and more localized regions of sensitivity, resembling the shapes of different kinds of nuts. Here, we report the regions of sensitivity associated with a variety of source-detector arrangements for dual-slope measurements of intensity and phase with frequency-domain spectroscopy (modulation frequency: 140 MHz) in a medium with absorption and reduced scattering coefficients of 0.1 cm-1 and 12 cm-1, respectively. The main result is that the depth of maximum sensitivity, considering only cases that use source-detector separations of 25 and 35 mm, progressively increases as we consider single-distance intensity (2.0 mm), dual-slope intensity (4.6 mm), single-distance phase (7.5 mm), and dual-slope phase (10.9 mm). These results indicate the importance of dual-slope measurements, and even more so of phase measurements, when it is desirable to selectively probe deeper portions of a sample with diffuse optics. This is certainly the case in non-invasive optical studies of brain, muscle, and breast tissue, which are located underneath superficial tissue at variable depths.
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Affiliation(s)
- Sergio Fantini
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | - Giles Blaney
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | - Angelo Sassaroli
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
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82
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Low DA, Jones H, Cable NT, Alexander LM, Kenney WL. Historical reviews of the assessment of human cardiovascular function: interrogation and understanding of the control of skin blood flow. Eur J Appl Physiol 2019; 120:1-16. [PMID: 31776694 PMCID: PMC6969866 DOI: 10.1007/s00421-019-04246-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 10/19/2019] [Indexed: 02/06/2023]
Abstract
Several techniques exist for the determination of skin blood flow that have historically been used in the investigation of thermoregulatory control of skin blood flow, and more recently, in clinical assessments or as an index of global vascular function. Skin blood flow measurement techniques differ in their methodology and their strengths and limitations. To examine the historical development of techniques for assessing skin blood flow by describing the origin, basic principles, and important aspects of each procedure and to provide recommendations for best practise. Venous occlusion plethysmography was one of the earliest techniques to intermittently index a limb’s skin blood flow under conditions in which local muscle blood flow does not change. The introduction of laser Doppler flowmetry provided a method that continuously records an index of skin blood flow (red cell flux) (albeit from a relatively small skin area) that requires normalisation due to high site-to-site variability. The subsequent development of laser Doppler and laser speckle imaging techniques allows the mapping of skin blood flow from larger surface areas and the visualisation of capillary filling from the dermal plexus in two dimensions. The use of iontophoresis or intradermal microdialysis in conjunction with laser Doppler methods allows for the local delivery of pharmacological agents to interrogate the local and neural control of skin blood flow. The recent development of optical coherence tomography promises further advances in assessment of the skin circulation via three-dimensional imaging of the skin microvasculature for quantification of vessel diameter and vessel recruitment.
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Affiliation(s)
- David A Low
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, L3 3AF, UK.
| | - Helen Jones
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, L3 3AF, UK
| | - N Tim Cable
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Liverpool, UK
| | - Lacy M Alexander
- Noll Laboratory, Department of Kinesiology, The Pennsylvania State University, University Park, PA, USA
| | - W Larry Kenney
- Noll Laboratory, Department of Kinesiology, The Pennsylvania State University, University Park, PA, USA
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83
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Sassaroli A, Blaney G, Fantini S. Dual-slope method for enhanced depth sensitivity in diffuse optical spectroscopy. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2019; 36:1743-1761. [PMID: 31674440 PMCID: PMC7160974 DOI: 10.1364/josaa.36.001743] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Using diffusion theory, we show that a dual-slope method is more effective than single-slope methods or single-distance methods at enhancing sensitivity to deeper tissue. The dual-slope method requires a minimum of two sources and two detectors arranged in specially configured arrays. In particular, we present diffusion theory results for a symmetrical linear array of two sources (separated by 55 mm) that sandwich two detectors (separated by 15 mm), for which dual slopes achieve maximal sensitivity at a depth of about 5 mm for direct current (DC) intensity (as measured in continuous-wave spectroscopy) and 11 mm for phase (as measured in frequency-domain spectroscopy) under typical values of the tissue optical properties (absorption coefficient: ∼0.01mm-1, reduced scattering coefficient: ∼1mm-1). This result is a major advance over single-distance or single-slope data, which feature maximal sensitivity to shallow tissue (<2mm for the intensity, <5mm for the phase).
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84
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Linares SN, Beltrame T, Ferraresi C, Galdino GAM, Catai AM. Photobiomodulation effect on local hemoglobin concentration assessed by near-infrared spectroscopy in humans. Lasers Med Sci 2019; 35:641-649. [PMID: 31420794 DOI: 10.1007/s10103-019-02861-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 08/09/2019] [Indexed: 02/05/2023]
Abstract
Exposure of biological tissue to photobiomodulation therapy (PBMT) seems to increase the oxygen availability and mitochondrial electrochemical activity. With the advancement of new technologies, such as near-infrared spectroscopy (NIRS), information can be obtained about the balance between oxygen utilization and delivery by assessing local oxy- ([O2Hb]) and deoxy-myohemoglobin ([HHb]) concentrations, both measured in micromolars (μM). Consequently, NIRS can be used to study ("in vivo") PBMT effects on the oxidative system, including oxygen availability. Thus, the main objective of the present study was to use NIRS to investigate the acute effects of PBMT by light-emitting diode (LED) on the oxygen delivery and utilization in humans. Twelve healthy young participants were treated with a LED device (850 nm, 50 mW, 2 J) and placebo applied over the proximal third of the flexor carpi ulnaris muscle of the left or right forearm selected in a random order. The LED was applied in direct contact with skin and the device was switched on for 40 s in 4 different interventions (I1, I2, I3 and I4) with a 3-min interval between interventions. The placebo condition was considered as the period before the first PBMT. The NIRS device was used to evaluate the relative changes in [O2Hb] and [HHb] before and after placebo and interventions. We found that PBMT statistically increased the [O2Hb] in 0.39 μM. These results demonstrate the potential of PBMT to increase oxygen availability.
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Affiliation(s)
- Stephanie Nogueira Linares
- Cardiovascular Physical Therapy Laboratory, Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil
| | - Thomas Beltrame
- Cardiovascular Physical Therapy Laboratory, Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil. .,Institute of Computing, University of Campinas, Campinas, São Paulo, Brazil.
| | - Cleber Ferraresi
- Biomedical Engineering Postgraduate Program, Universidade Brasil, São Paulo, Brazil
| | - Gabriela Aguiar Mesquita Galdino
- Cardiovascular Physical Therapy Laboratory, Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil
| | - Aparecida Maria Catai
- Cardiovascular Physical Therapy Laboratory, Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil
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Ma KF, Kleiss SF, Schuurmann RCL, Bokkers RPH, Ünlü Ç, De Vries JPPM. A systematic review of diagnostic techniques to determine tissue perfusion in patients with peripheral arterial disease. Expert Rev Med Devices 2019; 16:697-710. [PMID: 31340684 DOI: 10.1080/17434440.2019.1644166] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Introduction: Peripheral arterial disease (PAD) may cause symptoms due to impaired tissue perfusion of the lower extremity. So far, assessment of PAD is mainly performed by determination of stenosis or occlusion in the large arteries and does not focus on microcirculation. Several diagnostic techniques have been recently introduced that may enable tissue perfusion measurements in the lower limb; however, most have not yet been implemented in clinical daily practice. This systematic review provides an overview of these diagnostic techniques and their ability to accurately detect PAD by peripheral tissue perfusion. Areas covered: A literature search was performed for articles that described a diagnostic technique to determine tissue perfusion in patients with known PAD compared with healthy controls. Expert opinion: So far, transcutaneous oxygen measurements are most often used to measure tissue oxygenation in PAD patients, but evidence seems too low to define this technique as a gold standard, and implementing this technique for home monitoring is difficult. New potentially suitable diagnostic tests should be non-invasive, contact-free, and quick. Further research is needed for all of these techniques before broad implementation in clinical use is justified, in hospital, and for home monitoring.
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Affiliation(s)
- Kirsten F Ma
- a Department of Surgery, Division of Vascular Surgery, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | - Simone F Kleiss
- a Department of Surgery, Division of Vascular Surgery, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | - Richte C L Schuurmann
- a Department of Surgery, Division of Vascular Surgery, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | - Reinoud P H Bokkers
- b Department of Vascular Surgery, Noordwest Hospital Group , Alkmaar , The Netherlands
| | - Çagdas Ünlü
- c Department of Radiology, Medical Imaging Center, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | - Jean-Paul P M De Vries
- a Department of Surgery, Division of Vascular Surgery, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
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Macnab A, Stothers L, Deegan E. Development of a near-infrared spectroscopy interface able to assess oxygen recovery kinetics in the right and left sides of the pelvic floor. JOURNAL OF BIOMEDICAL OPTICS 2019; 24:1-5. [PMID: 31368259 PMCID: PMC6995962 DOI: 10.1117/1.jbo.24.7.075003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 06/21/2019] [Indexed: 06/10/2023]
Abstract
Near-infrared spectroscopy (NIRS) muscle oxygenation data are relied on in sports medicine. Many women with urinary incontinence (UI) have dysfunctional pelvic floor muscles (PFMs) but their evaluation lacks such measures; a transvaginal NIRS interface would enable the PFM to be interrogated. Paired miniature fiber-optic cables were configured on a rigid foam insert so their emitter detector arrays with an interoptode distance of 20 mm apposed the right and left inner sides of a disposable clear plastic vaginal speculum, and linked to a standard commercial NIRS instrument. Measurement capability was assessed through conduct of three maximum voluntary contractions (MVCs) and one sustained maximum voluntary contraction of the PFM with calculation of HbDiff (½RT), a validated muscle reoxygenation kinetic parameter. In all four asymptomatic controls, mean age 40, mean BMI 21.4, MVCs were associated with changes in PFM oxyhemoglobin (O2Hb), deoxyhemoglobin (HHb) concentration, and their difference (HbDiff) comparable to those in voluntary muscle sports medicine studies. NIRS data during recovery (reoxygenation) allowed calculation of HbDiff (½RT). New techniques are called for to evaluate UI. This NIRS interface warrants further development as the provision of quantitative reoxygenation kinetics offers more comprehensive evaluation of patients with PFM dysfunction.
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Affiliation(s)
- Andrew Macnab
- University of British Columbia, Department of Urologic Sciences, Vancouver, Canada
| | - Lynn Stothers
- University of British Columbia, Department of Urologic Sciences, Vancouver, Canada
| | - Emily Deegan
- University of British Columbia, Department of Experimental Medicine, Vancouver, Canada
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87
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Taudorf M, Nielsen MB, Schroeder TV, Lönn L, Nielsen HB. Endovascular aortic repair reduces gluteal oxygenation. Acta Radiol Open 2019; 8:2058460119850115. [PMID: 31205755 PMCID: PMC6535910 DOI: 10.1177/2058460119850115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 04/16/2019] [Indexed: 11/17/2022] Open
Abstract
Background Provoked gluteal claudication is a known risk after endovascular aortic repair (EVAR). Lowered gluteal muscle oxygenation (SgmO2) may be demonstrated by near-infrared spectroscopy (NIRS). Purpose To evaluate NIRS-determined SgmO2 in EVAR patients. Material and Methods NIRS-determined SgmO2 was used in an observational study design (n = 17). From the ambulatory setting, seven EVAR patients were included with reported gluteal claudication from medical records. In 10 patients scheduled for EVAR, SgmO2 was measured before and after the procedure. NIRS sensors were applied bilaterally on the gluteal region. Treadmill walking (12% incline, 2.4 km/h) was introduced to stress gluteal muscles. Results A reduced SgmO2 with regional side difference (P < 0.05) was noted in all 10 patients following EVAR and four reported gluteal claudication. In patients with gluteal claudication (n = 7), treadmill decreased SgmO2. The time to recover the SgmO2 was prolonged for tissue exposed to occluded hypogastric artery (median = 512 s, range = 73–1207 s vs. median = 137, range = 0–643 s; P = 0.046). Conclusions EVAR affects gluteal muscle oxygenation. NIRS could be used to assess whether gluteal claudication is related to lowered SgmO2.
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Affiliation(s)
- Mikkel Taudorf
- Department of Radiology, Rigshospitalet, Copenhagen, Denmark.,University of Copenhagen, Copenhagen, Denmark
| | - Michael B Nielsen
- Department of Radiology, Rigshospitalet, Copenhagen, Denmark.,University of Copenhagen, Copenhagen, Denmark
| | - Torben V Schroeder
- University of Copenhagen, Copenhagen, Denmark.,Copenhagen Academy for Medical Education and Simulation (CAMES), Centre for HR, Copenhagen, Denmark
| | - Lars Lönn
- Department of Radiology, Rigshospitalet, Copenhagen, Denmark.,University of Copenhagen, Copenhagen, Denmark
| | - Henning B Nielsen
- University of Copenhagen, Copenhagen, Denmark.,Department of Anaesthesia, Rigshospitalet, Copenhagen, Denmark.,Sanos Clinic, Herlev, Denmark
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88
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Effect of external compression on femoral retrograde shear and microvascular oxygenation in exercise trained and recreationally active young men. Eur J Appl Physiol 2019; 119:1809-1818. [PMID: 31190212 DOI: 10.1007/s00421-019-04170-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 05/28/2019] [Indexed: 10/26/2022]
Abstract
INTRODUCTION Retrograde shear causes endothelial damage and is pro-atherogenic. The purpose of our study was to examine the impact of vascular remodeling from habitual exercise training on acute changes in retrograde shear and microvascular oxygenation (SMO2) induced via 30 min of external compression. METHODS Participants included 11 exercise trained (ET) men (Division I track athletes; age 20 ± 3 years) and 18 recreationally active (RA) men (age 23 ± 5 years). Near-infrared spectroscopy (NIRS) was used to measure vastus medialis SMO2. Doppler-ultrasound was used to assess SFA intima-media thickness, diameter and flow velocity to derive retrograde shear. Vascular measures were made at baseline (BASELINE), during a sham condition (calf compression to 5 mmHg, SHAM) and during the experimental condition (calf compression to 60 mmHg, EXP). RESULTS Compared to RA, ET had larger SFA diameters (0.66 ± 0.06 vs 0.58 ± 0.06 cm, p < 0.05) and lower SFA IMT (0.33 ± 0.03 vs 0.36 ± 0.07 mm, p < 0.05). Retrograde shear increased similarly in both groups during EXP (p < 0.05) but ET men had lower overall retrograde shear during the conditions (BASELINE 75.8 ± 26.8 vs EXP 88.2 ± 16.9 s-1) compared to RA men (BASELINE 84.4 ± 23.3 vs EXP 106.4 ± 19.6 s-1p < 0.05). There was a similar increase in SMO2 from BASELINE to SHAM (ET + 8.1 ± 4.8 vs RA + 6.4 ± 9.7%) and BASELINE to EXP (ET + 8.7 ± 6.4 vs RA + 7.1 ± 9.0%) in both groups. CONCLUSION Beneficial vascular remodeling in ET men is associated with lower retrograde shear during external compression. Acute increases in retrograde shear with external compression do not detrimentally impact microvascular oxygenation.
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89
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Dalamitros AA, Mavridis G, Semaltianou E, Loupos D, Manou V. Psychophysiological and performance-related responses of a potentiation activity in swimmers of different competitive levels. Physiol Behav 2019; 204:106-111. [PMID: 30794850 DOI: 10.1016/j.physbeh.2019.02.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 02/12/2019] [Accepted: 02/12/2019] [Indexed: 01/26/2023]
Abstract
Athletes' competitive level has an effect on several psychophysiological parameters during the execution of sports-related tasks. This study analyzed the acute effect of a potentiation activity (PAP), composed by 5 loaded box jumps, on specific psychological, physiological and performance-related parameters in 22 trained (COM) and untrained (UNT) adult male swimmers. A control condition was also evaluated. Measurements included the Competitive State Anxiety Inventory, rate of perceived exertion, lower limbs muscle oxygenation, exercise heart rate, vertical jumping ability, 3 different split times and total time-trial performance during an all-out 50-m swim test executed using the breaststroke technique. In addition, total swim strokes and the optimal individual response after the potentiation activity were measured. No significant differences among the two testing conditions were found for all psychological, physiological and performance-related parameters (p > .05) with the exception of total performance time in the UNT group after the PAP condition (41.5 ± 5.3 vs. 41.9 ± 5.5 s; p = .023; ES = 0.6). As expected, the COM group showed enhanced swimming performance during all split times and total time, compared to the UNT group. These results suggest that (i) independently of the training level, psychological responses during sports-related tasks are probably not evident under non-competitive situations and, (ii) competitive level athletes may need more challenging activation stimulus, compared to their less competitive counterparts, to induce the desirable adaptations on the subsequent main activity.
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Affiliation(s)
- Athanasios A Dalamitros
- Faculty of Physical Education & Sport Sciences, School of Physical Education & Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
| | - Georgios Mavridis
- Faculty of Physical Education & Sport Sciences, School of Physical Education & Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Eleni Semaltianou
- Faculty of Physical Education & Sport Sciences, School of Physical Education & Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Dimitrios Loupos
- Faculty of Physical Education & Sport Sciences, School of Physical Education & Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Vasiliki Manou
- Faculty of Physical Education & Sport Sciences, School of Physical Education & Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
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90
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Proctor DN, Luck JC, Maman SR, Leuenberger UA, Muller MD. Esmolol acutely alters oxygen supply-demand balance in exercising muscles of healthy humans. Physiol Rep 2019; 6:e13673. [PMID: 29665297 PMCID: PMC5903697 DOI: 10.14814/phy2.13673] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 03/09/2018] [Indexed: 01/13/2023] Open
Abstract
Beta‐adrenoreceptor antagonists (β blockers) reduce systemic O2 delivery and blood pressure (BP) during exercise, but the subsequent effects on O2 extraction within the active limb muscles are unknown. In this study, we examined the effects of the fast‐acting, β1 selective blocker esmolol on systemic hemodynamics and leg muscle O2 saturation (near infrared spectroscopy, NIRS) during submaximal leg ergometry. Our main hypothesis was that esmolol would augment exercise‐induced reductions in leg muscle O2 saturation. Eight healthy adults (6 men, 2 women; 23–67 year) performed light and moderate intensity bouts of recumbent leg cycling before (PRE), during (β1‐blocked), and 45 min following (POST) intravenous infusion of esmolol. Oxygen uptake, heart rate (HR), BP, and O2 saturation (SmO2) of the vastus lateralis (VL) and medial gastrocnemius (MG) muscles were measured continuously. Esmolol attenuated the increases in HR and systolic BP during light (−12 ± 9 bpm and −26 ± 12 mmHg vs. PRE) and moderate intensity (−20 ± 10 bpm and −40 ± 18 mmHg vs. PRE) cycling (all P < 0.01). Exercise‐induced reductions in SmO2 occurred to a greater extent during the β1‐blockade trial in both the VL (P = 0.001 vs. PRE) and MG muscles (P = 0.022 vs. PRE). HR, SBP and SmO2 were restored during POST (all P < 0.01 vs. β1‐blocked). In conclusion, esmolol rapidly and reversibly increases O2 extraction within exercising muscles of healthy humans.
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Affiliation(s)
- David N Proctor
- Noll Laboratory, Department of Kinesiology, The Pennsylvania State University, University Park, Pennsylvania.,Penn State Heart and Vascular Institute, Penn State University College of Medicine, Hershey, Pennsylvania
| | - J Carter Luck
- Penn State Heart and Vascular Institute, Penn State University College of Medicine, Hershey, Pennsylvania
| | - Stephan R Maman
- Penn State Heart and Vascular Institute, Penn State University College of Medicine, Hershey, Pennsylvania
| | - Urs A Leuenberger
- Penn State Heart and Vascular Institute, Penn State University College of Medicine, Hershey, Pennsylvania
| | - Matthew D Muller
- Penn State Heart and Vascular Institute, Penn State University College of Medicine, Hershey, Pennsylvania.,Master of Science in Anesthesia Program, Case Western Reserve University School of Medicine, Cleveland, Ohio
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91
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Jeong H, Seong M, Lee HS, Park K, Moon S, Kim JG. Design of an Optical Probe to Monitor Vaginal Hemodynamics during Sexual Arousal. SENSORS 2019; 19:s19092129. [PMID: 31071987 PMCID: PMC6540249 DOI: 10.3390/s19092129] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 05/02/2019] [Accepted: 05/05/2019] [Indexed: 11/16/2022]
Abstract
An optical probe was developed to measure the change of oxy-hemoglobin (OHb), deoxy- hemoglobin (RHb), and total hemoglobin (THb) along with temperature from the vaginal wall of female rats. Apomorphine (APO, 80 μg/kg) was administered to elicit sexual arousal in female Sprague Dawley rats (SD, 180–200 g). The behavior changes caused by APO administration were checked before monitoring vaginal responses. The changes of oxy-, deoxy-, and total hemoglobin concentration and the temperature from the vaginal wall were monitored before, during, and after APO administration. Animals were under anesthesia during the measurement. After APO administration, the concentration of OHb (55 ± 29 μM/DPF), RHb (33 ± 25 μM/DPF), and THb (83 ± 59 μM/DPF) in the vaginal wall increased in a few min, while saline administration did not cause any significant change. In case of the vaginal temperature change, APO decreased the temperature slightly in the vaginal wall while saline administration did not show any temperature change in the vaginal wall. As the outcomes demonstrated, the developed probe can detect hemodynamic and temperature variation in the vaginal wall. The hemodynamic information acquired by the probe can be utilized to establish an objective and accurate standard of female sexual disorders.
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Affiliation(s)
- Hyeryun Jeong
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea.
| | - Myeongsu Seong
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea.
| | - Hyun-Suk Lee
- Department of Urology, Chonnam National University Medical School, Gwangju 61186, Korea.
| | - Kwangsung Park
- Department of Urology, Chonnam National University Medical School, Gwangju 61186, Korea.
| | - Sucbei Moon
- Department of Physics, Kookmin University, Seoul 02707, Korea.
| | - Jae Gwan Kim
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea.
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92
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Adelnia F, Cameron D, Bergeron CM, Fishbein KW, Spencer RG, Reiter DA, Ferrucci L. The Role of Muscle Perfusion in the Age-Associated Decline of Mitochondrial Function in Healthy Individuals. Front Physiol 2019; 10:427. [PMID: 31031645 PMCID: PMC6473080 DOI: 10.3389/fphys.2019.00427] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 03/27/2019] [Indexed: 12/25/2022] Open
Abstract
Maximum oxidative capacity of skeletal muscle measured by in vivo phosphorus magnetic resonance spectroscopy (31P-MRS) declines with age, and negatively affects whole-body aerobic capacity. However, it remains unclear whether the loss of oxidative capacity is caused by reduced volume and function of mitochondria or limited substrate availability secondary to impaired muscle perfusion. Therefore, we sought to elucidate the role of muscle perfusion on the age-related decline of muscle oxidative capacity and ultimately whole-body aerobic capacity. Muscle oxidative capacity was assessed by 31P-MRS post-exercise phosphocreatine recovery time (τPCr), with higher τPCr reflecting lower oxidative capacity, in 75 healthy participants (48 men, 22–89 years) of the Genetic and Epigenetic Signatures of Translational Aging Laboratory Testing study. Muscle perfusion was characterized as an index of blood volume at rest using a customized diffusion-weighted MRI technique and analysis method developed in our laboratory. Aerobic capacity (peak-VO2) was also measured during a graded treadmill exercise test in the same visit. Muscle oxidative capacity, peak-VO2, and resting muscle perfusion were significantly lower at older ages independent of sex, race, and body mass index (BMI). τPCr was significantly associated with resting muscle perfusion independent of age, sex, race, and BMI (p-value = 0.004, β = −0.34). τPCr was also a significant independent predictor of peak-VO2 and, in a mediation analysis, significantly attenuated the association between muscle perfusion and peak-VO2 (34% reduction for β in perfusion). These findings suggest that the age-associated decline in muscle oxidative capacity is partly due to impaired muscle perfusion and not mitochondrial dysfunction alone. Furthermore, our findings show that part of the decline in whole-body aerobic capacity observed with aging is also due to reduced microvascular blood volume at rest, representing a basal capacity of the microvascular system, which is mediated by muscle oxidative capacity. This finding suggests potential benefit of interventions that target an overall increase in muscle perfusion for the restoration of energetic capacity and mitochondrial function with aging.
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Affiliation(s)
- Fatemeh Adelnia
- Translational Gerontology Branch, Intramural Research Program, National Institute on Aging, National Institutes of Health, Baltimore, MD, United States
| | - Donnie Cameron
- Translational Gerontology Branch, Intramural Research Program, National Institute on Aging, National Institutes of Health, Baltimore, MD, United States.,Norwich Medical School, University of East Anglia, Norwich Research Park, Norwich, United Kingdom
| | - Christopher M Bergeron
- Laboratory of Clinical Investigation, Intramural Research Program, National Institute on Aging, National Institutes of Health, Baltimore, MD, United States
| | - Kenneth W Fishbein
- Laboratory of Clinical Investigation, Intramural Research Program, National Institute on Aging, National Institutes of Health, Baltimore, MD, United States
| | - Richard G Spencer
- Laboratory of Clinical Investigation, Intramural Research Program, National Institute on Aging, National Institutes of Health, Baltimore, MD, United States
| | - David A Reiter
- Translational Gerontology Branch, Intramural Research Program, National Institute on Aging, National Institutes of Health, Baltimore, MD, United States.,Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA, United States
| | - Luigi Ferrucci
- Translational Gerontology Branch, Intramural Research Program, National Institute on Aging, National Institutes of Health, Baltimore, MD, United States
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93
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Briggs R, Carey D, Claffey P, McNicholas T, Newman L, Nolan H, Kennelly SP, Kenny RA. The association between frontal lobe perfusion and depressive symptoms in later life. Br J Psychiatry 2019; 214:230-236. [PMID: 30606275 DOI: 10.1192/bjp.2018.288] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND Deficits in frontal lobe perfusion have been demonstrated in late-life depression; however, studies to date have generally involved small numbers, used neuroimaging rather than bedside testing and have not controlled for important covariates.AimsWe aimed to examine the association between depressive symptoms and frontal lobe perfusion during standing, in a large cohort of community-dwelling older people. METHOD Participants aged ≥50 years underwent continuous measurement of orthostatic blood pressure by finometry, and frontal lobe perfusion by near-infrared spectroscopy. Depressive symptoms were assessed by the eight-item Centre for Epidemiological Studies Depression Scale. Real-time frontal lobe cerebral oxygenation was measured by the Portalite System, detecting changes in frontal lobe perfusion and reporting a tissue saturation index score. RESULTS Almost 8% (209 out of 2616) had clinically significant depressive symptoms. Multilevel models demonstrated a significantly lower tissue saturation index in participants with depressive symptoms at both 60 and 90 s post-stand, with coefficients of -0.43 (95% CI -0.63 to -0.22) and -0.37 (95% CI -0.57 to -0.16), respectively. Controlling for relevant covariates did not significantly attenuate these associations. After addition of systolic blood pressure this association was no longer significant, suggesting lower blood pressure may modify this relationship. CONCLUSIONS This study demonstrates that lower frontal lobe perfusion, related to lower values of baseline systolic blood pressure, is associated with clinically significant depressive symptoms in a cohort of community-dwelling older people. Given the recognised longitudinal association between lower blood pressure and depression in older people, this may represent a potential therapeutic target for prevention of incident depression.Declaration of interestNone.
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Affiliation(s)
- Robert Briggs
- Research Fellow, The Irish Longitudinal Study on Ageing,Trinity College Dublin;Mercer's Institute for Successful Ageing,St James's Hospital; andAge-related Health Care,Tallaght Hospital,Ireland
| | - Daniel Carey
- Biostatistician, The Irish Longitudinal Study on Ageing,Trinity College Dublin,Ireland
| | - Paul Claffey
- Registrar in Geriatric Medicine, Mercer's Institute for Successful Ageing,St James's Hospital,Ireland
| | - Triona McNicholas
- Research Fellow, The Irish Longitudinal Study on Ageing,Trinity College Dublin; andMercer's Institute for Successful Ageing,St James's Hospital,Ireland
| | - Louise Newman
- Bioengineer, The Irish Longitudinal Study on Ageing,Trinity College Dublin,Ireland
| | - Hugh Nolan
- Bioengineer, The Irish Longitudinal Study on Ageing,Trinity College Dublin,Ireland
| | - Sean P Kennelly
- Consultant Geriatrician, Age-related Health Care,Tallaght Hospital,Ireland
| | - Rose Anne Kenny
- Consultant Geriatrician, The Irish Longitudinal Study on Ageing,Trinity College Dublin; andMercer's Institute for Successful Ageing,St James's Hospital,Ireland
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94
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Kaile K, Godavarty A. Development and Validation of a Smartphone-Based Near-Infrared Optical Imaging Device to Measure Physiological Changes In-Vivo. MICROMACHINES 2019; 10:E180. [PMID: 30857323 PMCID: PMC6471700 DOI: 10.3390/mi10030180] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 02/23/2019] [Accepted: 03/05/2019] [Indexed: 12/11/2022]
Abstract
Smartphone-based technologies for medical imaging purposes are limited, especially when it involves the measurement of physiological information of the tissues. Herein, a smartphone-based near-infrared (NIR) imaging device was developed to measure physiological changes in tissues across a wide area and without contact. A custom attachment containing multiple multi-wavelength LED light sources (690, 800, and 840 nm; and <4 mW of optical power per LED), source driver, and optical filters and lenses was clipped onto a smartphone that served as the detector during data acquisition. The ability of the device to measure physiological changes was validated via occlusion studies on control subjects. Noise removal techniques using singular value decomposition algorithms effectively removed surface noise and distinctly differentiated the physiological changes in response to occlusion. In the long term, the developed smartphone-based NIR imaging device with capabilities to capture physiological changes will be a great low-cost alternative for clinicians and eventually for patients with chronic ulcers and bed sores, and/or in pre-screening for potential ulcers in diabetic subjects.
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Affiliation(s)
- Kacie Kaile
- Optical Imaging Laboratory, Department of Biomedical Engineering, Florida International University, Miami, FL 33174, USA.
| | - Anuradha Godavarty
- Optical Imaging Laboratory, Department of Biomedical Engineering, Florida International University, Miami, FL 33174, USA.
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95
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Lamberti N, Manfredini F, Tessari M, Menegatti E, Nardi F, Basaglia N, Zamboni P. A near-infrared spectroscopy-assisted test discriminates patients with peripheral arterial disease and venous insufficiency with changes of foot oxygenation following light elastic compression therapy. VASA 2019; 48:361-367. [PMID: 30838936 DOI: 10.1024/0301-1526/a000780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Background: Elastic compression therapy (CT) in patients with peripheral artery disease (PAD) and chronic venous insufficiency (CVI) may compromise arterial perfusion. We evaluated the feasibility of a toe-flexion test, which quantifies dynamic foot perfusion by near-infrared spectroscopy (NIRS), for the assessment of hemodynamic sustainability of CT in PAD patients with CVI. Patients and methods: In this prospective observational study, PAD patients aged 50-85 with combined CVI at CEAP stages II-IV were studied. The ankle-brachial index (ABI) was measured, and foot perfusion was determined after 10 consecutive toe-flexion movements with NIRS sensors placed on the dorsum of each foot. Knee-high open-toe compression stockings were applied, and the degree of compression was measured. Toflex-area was determined by calculating the area under the curve of the oxygenated hemoglobin track recorded by NIRS. A toflex-area reduction > 20 % following CT was arbitrarily defined to identify limbs of patients with improved foot perfusion. These subjects received CT to be worn and a diary to report adherence and symptoms. Results: Forty-seven PAD patients (74 ± 9 years; ABI 0.67 ± 0.24) with CVI were enrolled. For all legs, superimposable toflex-areas were observed for the first two attempts (ICC 0.92). Following application of CT (17 ± 2 mmHg), the toflex-area improved (from -162 ± 110 a.u. to -112 ± 104 a.u.; p < .001). Sixty-two limbs (n = 32 patients) exhibited improved foot perfusion after CT, with a mean variation of 80 ± 47 a.u., while 32 limbs (n = 23 patients) showed stable or worsened values. In a regression model, favorable variations in toflex-area after CT were linked to a worse baseline toflex-area (R2 = 0.18; p < 0.001; rpartial = -0.42) while the percentage improvement directly correlated with CEAP class (p = 0.033). Conclusions: The NIRS-assisted test, which is feasible in a laboratory context, objectively discriminates the hemodynamic tolerability of the treatment and identifies subjects with combined PAD and CVI with improved perfusion after CT, in spite of the presence of PAD.
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Affiliation(s)
- Nicola Lamberti
- 1 Department of Biomedical and Surgical Specialties Sciences, University of Ferrara, Ferrara, Italy
| | - Fabio Manfredini
- 1 Department of Biomedical and Surgical Specialties Sciences, University of Ferrara, Ferrara, Italy.,2 Unit of Physical and Rehabilitation Medicine, University Hospital of Ferrara, Ferrara, Italy
| | - Mirko Tessari
- 3 Department of Morphology, Surgery and Experimental Medicine, University of Ferrara, Ferrara, Italy
| | - Erica Menegatti
- 3 Department of Morphology, Surgery and Experimental Medicine, University of Ferrara, Ferrara, Italy.,4 Unit of Translational Surgery, University Hospital of Ferrara, Ferrara, Italy
| | - Francesca Nardi
- 1 Department of Biomedical and Surgical Specialties Sciences, University of Ferrara, Ferrara, Italy
| | - Nino Basaglia
- 2 Unit of Physical and Rehabilitation Medicine, University Hospital of Ferrara, Ferrara, Italy
| | - Paolo Zamboni
- 3 Department of Morphology, Surgery and Experimental Medicine, University of Ferrara, Ferrara, Italy.,4 Unit of Translational Surgery, University Hospital of Ferrara, Ferrara, Italy
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96
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Huang YH, Chuang ML, Wang PZ, Chen YC, Chen CM, Sun CW. Muscle oxygenation dynamics in response to electrical stimulation as measured with near-infrared spectroscopy: A pilot study. JOURNAL OF BIOPHOTONICS 2019; 12:e201800320. [PMID: 30499178 DOI: 10.1002/jbio.201800320] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 10/20/2018] [Accepted: 11/27/2018] [Indexed: 06/09/2023]
Abstract
Neuromuscular electrical stimulation (NMES) is used for preventing muscle atrophy and improving muscle strength in patients and healthy people. However, the current intensity of NMES is usually set at a level that causes the stimulated muscles to contract. This typically causes pain. Quantifying the instantaneous changes in muscle microcirculation and metabolism during NMES before muscle contraction occurs is crucial, because it enables the current intensity to be optimally tuned, thereby reducing the NMES-induced muscle pain and fatigue. We applied near-infrared spectroscopy (NIRS) to measure instantaneous tissue oxygenation and deoxygenation changes in 43 healthy young adults during NMES at 10, 15, 20, 25, 30, and 35 mA. Having been stabilized at the NIRS signal baseline, the tissue oxygenation and total hemoglobin concentration increased immediately after stimulation in a dose-dependent manner (P < 0.05) until stimulation was stopped at the level causing muscle contraction without pain. Tissue deoxygenation appeared relatively unchanged during NMES. We conclude that NIRS can be used to determine the optimal NMES current intensity by monitoring oxygenation changes.
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Affiliation(s)
- Yi-Hua Huang
- Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan
| | - Ming-Lung Chuang
- Division of Pulmonary Medicine, Department of Internal Medicine and Department of Critical Care Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan
- School of Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Pay-Zen Wang
- Department of Rehabilitation, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Yueh-Chi Chen
- Physical Therapy Room, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Chung-Ming Chen
- Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan
| | - Chia-Wei Sun
- Department of Photonics, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu, Taiwan
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97
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Shastri L, Alkhalil M, Forbes C, El‐Wadi T, Rafferty G, Ishida K, Formenti F. Skeletal muscle oxygenation during cycling at different power output and cadence. Physiol Rep 2019; 7:e13963. [PMID: 30734533 PMCID: PMC6367161 DOI: 10.14814/phy2.13963] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Accepted: 12/07/2018] [Indexed: 11/24/2022] Open
Abstract
The selection of cadence during cycling may be determined by a number of factors, including the degree of oxygenation in the exercising skeletal muscle. The purpose of this study was to determine the degree of muscle oxygenation associated with different cycling cadences and exercise intensities, and its putative role in the choice of self-selected cadence during cycling. We recorded cardiopulmonary and metabolic responses to cycling at exercise intensities of 70% and 90% of the ventilatory threshold (Tvent ), and used near-infrared spectroscopy to determine tissue saturation index as a measure of skeletal muscle (vastus lateralis) oxygenation. Twelve participants cycled at cadences of 30, 50, 70, 90, and 110 revolutions per minute (rpm), each for 4 min, in a randomized sequence, interspersed with active recovery periods. Despite cardiopulmonary and metabolic responses being greater at 90% than at 70% Tvent , and at 110 rpm compared with lower cadences, vastus lateralis oxygenation was not different between the two exercise intensities and five cadences tested. Our results indicate that skeletal muscle tissue saturation index is not substantially affected during cycling for short periods of time at constant, moderate exercise intensity at cadences between 30 and 110 rpm, suggesting that skeletal muscle oxygenation may not be an important negative feedback signal in the choice of self-selected cadence during cycling at moderate exercise intensity.
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Affiliation(s)
- Lisha Shastri
- Centre for Human and Applied Physiological SciencesFaculty of Life Sciences and MedicineKing's College LondonLondonUnited Kingdom
| | - Mariana Alkhalil
- Centre for Human and Applied Physiological SciencesFaculty of Life Sciences and MedicineKing's College LondonLondonUnited Kingdom
| | - Claire Forbes
- Centre for Human and Applied Physiological SciencesFaculty of Life Sciences and MedicineKing's College LondonLondonUnited Kingdom
| | - Tina El‐Wadi
- Centre for Human and Applied Physiological SciencesFaculty of Life Sciences and MedicineKing's College LondonLondonUnited Kingdom
| | - Gerrard Rafferty
- Centre for Human and Applied Physiological SciencesFaculty of Life Sciences and MedicineKing's College LondonLondonUnited Kingdom
| | - Koji Ishida
- Research Centre of HealthPhysical Fitness and SportNagoya UniversityNagoyaJapan
| | - Federico Formenti
- Centre for Human and Applied Physiological SciencesFaculty of Life Sciences and MedicineKing's College LondonLondonUnited Kingdom
- Nuffield Division of AnaestheticsUniversity of OxfordOxfordUnited Kingdom
- Department of BiomechanicsUniversity of Nebraska at OmahaNebraska
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98
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Boyes NG, Eckstein J, Pylypchuk S, Marciniuk DD, Butcher SJ, Lahti DS, Dewa DMK, Haykowsky MJ, Wells CR, Tomczak CR. Effects of heavy-intensity priming exercise on pulmonary oxygen uptake kinetics and muscle oxygenation in heart failure with preserved ejection fraction. Am J Physiol Regul Integr Comp Physiol 2019; 316:R199-R209. [PMID: 30601707 DOI: 10.1152/ajpregu.00290.2018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Exercise intolerance is a hallmark feature in heart failure with preserved ejection fraction (HFpEF). Prior heavy exercise ("priming exercise") speeds pulmonary oxygen uptake (V̇o2p) kinetics in older adults through increased muscle oxygen delivery and/or alterations in mitochondrial metabolic activity. We tested the hypothesis that priming exercise would speed V̇o2p on-kinetics in patients with HFpEF because of acute improvements in muscle oxygen delivery. Seven patients with HFpEF performed three bouts of two exercise transitions: MOD1, rest to 4-min moderate-intensity cycling and MOD2, MOD1 preceded by heavy-intensity cycling. V̇o2p, heart rate (HR), total peripheral resistance (TPR), and vastus lateralis tissue oxygenation index (TOI; near-infrared spectroscopy) were measured, interpolated, time-aligned, and averaged. V̇o2p and HR were monoexponentially curve-fitted. TPR and TOI levels were analyzed as repeated measures between pretransition baseline, minimum value, and steady state. Significance was P < 0.05. Time constant (τ; tau) V̇o2p (MOD1 49 ± 16 s) was significantly faster after priming (41 ± 14 s; P = 0.002), and the effective HR τ was slower following priming (41 ± 27 vs. 51 ± 32 s; P = 0.025). TPR in both conditions decreased from baseline to minimum TPR ( P < 0.001), increased from minimum to steady state ( P = 0.041) but remained below baseline throughout ( P = 0.001). Priming increased baseline ( P = 0.003) and minimum TOI ( P = 0.002) and decreased the TOI muscle deoxygenation overshoot ( P = 0.041). Priming may speed the slow V̇o2p on-kinetics in HFpEF and increase muscle oxygen delivery (TOI) at the onset of and throughout exercise. Microvascular muscle oxygen delivery may limit exercise tolerance in HFpEF.
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Affiliation(s)
- Natasha G Boyes
- College of Kinesiology, University of Saskatchewan , Saskatoon, SK , Canada
| | - Janine Eckstein
- College of Medicine, University of Saskatchewan , Saskatoon, SK , Canada
| | - Stephen Pylypchuk
- College of Medicine, University of Saskatchewan , Saskatoon, SK , Canada
| | - Darcy D Marciniuk
- College of Medicine, University of Saskatchewan , Saskatoon, SK , Canada
| | - Scotty J Butcher
- School of Physical Therapy, University of Saskatchewan , Saskatoon, SK , Canada
| | - Dana S Lahti
- College of Kinesiology, University of Saskatchewan , Saskatoon, SK , Canada
| | - Dalisizwe M K Dewa
- College of Medicine, University of Saskatchewan , Saskatoon, SK , Canada
| | - Mark J Haykowsky
- Integrated Cardiovascular Exercise Physiology and Rehabilitation Laboratory, College of Nursing and Health Innovation, University of Texas at Arlington , Arlington, Texas
| | - Calvin R Wells
- College of Medicine, University of Saskatchewan , Saskatoon, SK , Canada
| | - Corey R Tomczak
- College of Kinesiology, University of Saskatchewan , Saskatoon, SK , Canada
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99
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Richard P, Billaut F. Effects of inspiratory muscle warm-up on locomotor muscle oxygenation in elite speed skaters during 3000 m time trials. Eur J Appl Physiol 2018; 119:191-200. [PMID: 30350154 DOI: 10.1007/s00421-018-4015-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 10/10/2018] [Indexed: 10/28/2022]
Abstract
PURPOSE It has been shown that an inspiratory muscle warm-up (IMW) could enhance performance. IMW may also improve the near-infrared spectroscopy (NIRS)-derived tissue oxygen saturation index (TSI) during cycling. However, there exists contradictory data about the effect of this conditioning strategy on performance and muscle oxygenation. We examined the effect of IMW on speed skating performance and studied the underpinning physiological mechanisms related to muscle oxygenation. METHODS In a crossover, randomized, single-blind study, eight elite speed skaters performed 3000 m on-ice time trials, preceded by either IMW (2 × 30 breaths, 40% maximal inspiratory pressure) or SHAM (2 × 30 breaths, 15% maximal inspiratory pressure). Changes in TSI, oxyhemoglobin-oxymyoglobin ([O2HbMb]), deoxyhemoglobin-deoxymyoglobin ([HHbMb]), total hemoglobin-myoglobin ([THbMb]) and HHbMbdiff ([O2HbMb]-[HHbMb]) in the right vastus lateralis muscle were monitored by NIRS. All variables were compared at different time points of the race simulation with repeated-measures analysis of variance. Differences between IMW and SHAM were also analyzed using Cohen's effect size (ES) ± 90% confidence limits, and magnitude-based inferences. RESULTS Compared with SHAM, IMW had no clear impact on skating time (IMW 262.88 ± 17.62 s vs. SHAM 264.05 ± 21.12 s, effect size (ES) 0.05; 90% confidence limits, - 0.22, 0.32, p = 0.7366), TSI, HbMbdiff, [THbMb], [O2HbMb] and perceptual responses. CONCLUSIONS IMW did not modify skating time during a 3000 m time trial in speed skaters, in the conditions of our study. The unchanged [THbMb] and TSI demonstrate that the mechanisms by which IMW could possibly exert an effect on performance were unaffected by this intervention.
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Affiliation(s)
- Philippe Richard
- Département de kinésiologie, Université Laval, 2300, rue de la Terrasse, Quebec, QC, G1V 0A6, Canada
| | - François Billaut
- Département de kinésiologie, Université Laval, 2300, rue de la Terrasse, Quebec, QC, G1V 0A6, Canada.
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100
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Osumah TS, Jimbo M, Granberg CF, Gargollo PC. Frontiers in pediatric testicular torsion: An integrated review of prevailing trends and management outcomes. J Pediatr Urol 2018; 14:394-401. [PMID: 30087037 DOI: 10.1016/j.jpurol.2018.07.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 07/13/2018] [Indexed: 12/12/2022]
Abstract
Testicular torsion remains the most frequent cause of testicular ischemia, especially in adolescents and young adults. Timely diagnosis and intervention are keys to saving the affected testicle. This review presents current trends in the diagnosis and treatment of torsion, potential pitfalls and consequent outcomes. Additionally, other salient issues surrounding testicular torsion are also discussed, including: pathogenesis of injury, legal ramifications, fertility outcomes, novel management techniques, and recent advances in diagnostic technology.
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Affiliation(s)
- T S Osumah
- Department of Urology, Mayo Clinic, Rochester, MN, USA
| | - M Jimbo
- Department of Urology, Mayo Clinic, Rochester, MN, USA
| | - C F Granberg
- Department of Urology, Mayo Clinic, Rochester, MN, USA
| | - P C Gargollo
- Department of Urology, Mayo Clinic, Rochester, MN, USA.
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