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Clinical Physiology and Functional Imaging

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https://www.readbyqxmd.com/read/28627125/the-role-of-long-term-physical-exercise-on-performance-and-brain-activation-during-the-stroop-colour-word-task-in-fibromyalgia-patients
#1
S Martinsen, P Flodin, J Berrebi, M Löfgren, I Bileviciute-Ljungar, K Mannerkorpi, M Ingvar, P Fransson, E Kosek
The Stroop colour word test (SCWT) has been widely used to assess changes in cognitive performance such as processing speed, selective attention and the degree of automaticity. Moreover, the SCWT has proven to be a valuable tool to assess neuronal plasticity that is coupled to improvement in performance in clinical populations. In a previous study, we showed impaired cognitive processing during SCWT along with reduced task-related activations in patients with fibromyalgia. In this study, we used SCWT and functional magnetic resonance imagingFMRI to investigate the effects of a 15-week physical exercise intervention on cognitive performance, task-related cortical activation and distraction-induced analgesia (DIA) in patients with fibromyalgia and healthy controls...
June 18, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28627113/can-tissue-dielectric-constant-measurements-assess-circulating-blood-volume-changes-in-patients-undergoing-haemodialysis
#2
Ken-Taro Toyooka, Hidetomo Niwa, Eiji Hashiba, Kazuyoshi Hirota
BACKGROUND: The tissue dielectric constant (TDC) method uses an open-ended coaxial probe to achieve non-invasive measurement of water content in skin. The aim of our study was to test the hypothesis that the changes in circulating blood volume would be associated with the changes in TDC values in patients undergoing haemodialysis. METHODS: In this prospective descriptive study, TDC measurements were performed for three parts of the body (the face, shin and hand) before and after patients underwent haemodialysis (N = 83)...
June 18, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28626873/assessing-prefrontal-cortex-oxygenation-after-sport-concussion-with-near-infrared-spectroscopy
#3
Scott A Bishop, J Patrick Neary
BACKGROUND: Clinicians typically rely on neuropsychological and balance tests to track concussion recovery. The aforementioned tests imply impairments that are based on performance, but these tests do not directly measure brain physiology throughout concussion recovery. Because of these issues, an objective biomarker that can index severity and the recovery timeline is needed. Moreover, the number of concussions occurring at a recreational level requires the biomarker to be easily administered in a cost effective manner, and the results easily interpreted...
June 18, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28589670/texture-analysis-of-ultrasound-images-is-a-sensitive-method-to-follow-up-muscle-damage-induced-by-eccentric-exercise
#4
Thiago Torres da Matta, Wagner Coelho de Albuquerque Pereira, Regis Radaelli, Ronei Silveira Pinto, Liliam Fernandes de Oliveira
The grey level of co-occurrence matrix (GLCM) is a texture analysis approach accounting for spatial distribution of the pixels from an image and can be a promising method for exercise-induced muscle damage (EIMD) studies. We followed up the time changes of two GLCM texture parameters and echo intensity (EI) on ultrasound images after eccentric contractions. Thirteen untrained women performed two sets of ten elbow flexions eccentric contractions. Ultrasound images were acquired at baseline and 24 h, 48 h, 72 h and 96 h after exercise...
June 7, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28574230/nicotine-effects-on-exercise-performance-and-physiological-responses-in-nicotine-na%C3%A3-ve-individuals-a-systematic-review
#5
REVIEW
Robert Johnston, Kenji Doma, Melissa Crowe
The purpose of this systematic review was to evaluate the effects of smokeless forms of nicotine on physiological responses and exercise performance. Methodology and reporting were based on the PRISMA statement. The intervention was defined as any product containing nicotine that did not require smoking. Searches were conducted across two electronic databases with supplementary approaches utilized. Studies were selected following set inclusion and exclusion criteria and checked by two independent authors. A modified PEDro scale was utilized to rate study quality with studies averaging 9·3/13...
June 2, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28574213/comparison-of-cardiac-output-estimates-by-bioreactance-and-inert-gas-rebreathing-methods-during-cardiopulmonary-exercise-testing
#6
Nduka C Okwose, Shakir Chowdhury, David Houghton, Michael I Trenell, Christopher Eggett, Matthew Bates, Guy A MacGowan, Djordje G Jakovljevic
PURPOSE: This study assessed the agreement between cardiac output estimated by inert gas rebreathing and bioreactance methods at rest and during exercise. METHODS: Haemodynamic measurements were assessed in 20 healthy individuals (11 females, nine males; aged 32 ± 10 years) using inert gas rebreathing and bioreactance methods. Gas exchange and haemodynamic data were measured simultaneously under rest and different stages (i.e. 30, 60, 90, 120, 150 and 180 W) of progressive graded cardiopulmonary exercise stress testing using a bicycle ergometer...
June 2, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28574212/calculation-algorithms-alter-the-breath-by-breath-gas-exchange-values-when-abrupt-changes-in-ventilation-occur
#7
Valentina Cettolo, Maria Pia Francescato
The automatic metabolic units calculate breath-by-breath gas exchange from the expiratory data only, applying an algorithm ('expiration-only' algorithm) that neglects the changes in the lung gas stores. These last are theoretically taken into account by a recently proposed algorithm, based on an alternative view of the respiratory cycle ('alternative respiratory cycle' algorithm). The performance of the two algorithms was investigated where changes in the lung gas stores were induced by abrupt increases in ventilation above the physiological demand...
June 2, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28574166/intra-and-inter-day-reproducibility-of-low-flow-mediated-constriction-response-in-young-adults
#8
Michelle M Harbin, Joseph D Ostrem, Nicholas G Evanoff, Aaron S Kelly, Donald R Dengel
PURPOSE: When assessing brachial endothelial function by reactive hyperaemia, stopping blood flow creates a period of low-flow-mediated constriction (L-FMC). As little is known about how this parameter influences flow-mediated vasodilation (FMD), the purpose of this study was to better understand this relationship and to determine the intra- and interday reproducibility of brachial L-FMC. METHODS: Brachial L-FMC and FMD were measured on 26 healthy, young adults (13 males, 13 females; 24·6 ± 2·7 years)...
June 2, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28474785/protein-timing-during-the-day-and-its-relevance-for-muscle-strength-and-lean-mass
#9
Samuel L Buckner, Jeremy P Loenneke, Paul D Loprinzi
Protein consumption and its association with changes in body composition, muscle function and different strategies to optimize the muscle protein synthetic response have received considerable attention. However, we are not aware of any epidemiological study examining the time-of-day consumption (afternoon versus evening) of protein on strength and lean mass. The purpose was to examine the associations between afternoon and evening protein consumption, at different protein thresholds (i.e. 15, 20, 25 and 30 g), in relation to leg lean mass and knee extensor strength in men...
May 5, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28471050/high-intensity-interval-training-using-whole-body-exercises-training-recommendations-and-methodological-overview
#10
REVIEW
Alexandre F Machado, Julien S Baker, Aylton J Figueira Junior, Danilo S Bocalini
HIIT whole body (HWB)-based exercise is a new calisthenics exercise programme approach that can be considered an effective and safe method to improve physical fitness and body composition. HWB is a method that can be applied to different populations and ages. The purpose of this study was to describe possible methodologies for performing physical training based on whole-body exercise in healthy subjects. The HWB sessions consist of a repeated stimulus based on high-intensity exercise that also include monitoring time to effort, time to recuperation and session time...
May 4, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28471041/an-investigation-into-the-relationship-between-heart-rate-variability-and-the-ventilatory-threshold-in-healthy-moderately-trained-males
#11
Andrew Grannell, Giuseppe De Vito
BACKGROUND: During incremental exercise, heart rate variability (HRV) has been shown to display distinct stabilization and inflection points, which have been used to indirectly detect the ventilatory threshold (VT). METHODS: Ten moderately trained males (26·5 ± 5·9 years: VO2peak 48·7 ± 4·1 ml min(-1 ) kg(-1) ) performed an incremental test on a cycle ergometer until volitional exhaustion with both R-R intervals and respiratory indices recorded. HRV was quantified using both nonlinear (Poincare plot; short-term variability SD1) and spectral analysis of the R-R intervals (high-frequency component; HFp)...
May 4, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28448687/postexercise-blood-flow-restriction-does-not-enhance-muscle-hypertrophy-induced-by-multiple-set-high-load-resistance-exercise
#12
Haruhiko Madarame, Satoshi Nakada, Takahisa Ohta, Naokata Ishii
To test the applicability of postexercise blood flow restriction (PEBFR) in practical training programmes, we investigated whether PEBFR enhances muscle hypertrophy induced by multiple-set high-load resistance exercise (RE). Seven men completed an eight-week RE programme for knee extensor muscles. Employing a within-subject design, one leg was subjected to RE + PEBFR, whereas contralateral leg to RE only. On each exercise session, participants performed three sets of unilateral knee extension exercise at approximately 70% of their one-repetition maximum for RE leg first, and then performed three sets for RE + PEBFR leg...
April 27, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28444941/automated-ultrasound-edge-tracking-software-comparable-to-established-semi-automated-reference-software-for-carotid-intima-media-thickness-analysis
#13
Ninette Shenouda, Nicole A Proudfoot, Katharine D Currie, Brian W Timmons, Maureen J MacDonald
Many commercial ultrasound systems are now including automated analysis packages for the determination of carotid intima-media thickness (cIMT); however, details regarding their algorithms and methodology are not published. Few studies have compared their accuracy and reliability with previously established automated software, and those that have were in asymptomatic adults. Therefore, this study compared cIMT measures from a fully automated ultrasound edge-tracking software (EchoPAC PC, Version 110.0.2; GE Medical Systems, Horten, Norway) to an established semi-automated reference software (Artery Measurement System (AMS) II, Version 1...
April 26, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28444940/h-reflex-and-m-wave-recordings-effect-of-pressure-application-to-the-stimulation-electrode-on-the-assessment-of-evoked-potentials-and-subject-s-discomfort
#14
Thomas Cattagni, Angèle N Merlet, Christophe Cornu, Marc Jubeau
This study aimed to compare the effect of different types of pressure applied to the stimulation electrode on assessing the efficiency of Ia-α-motoneuron transmission of the soleus muscle and the associated discomfort using electrical nerve stimulation. Twelve healthy young adults participated in three experimental sessions (one for each knee angle). The amplitudes of the maximal Hoffmann reflex (Hmax ) and motor potential (Mmax ) were recorded from the soleus muscle at 0°, 30° and 90° knee angles (0° full extension) through three pressure applications to the stimulation electrode: no pressure, pressure with manual application and pressure using adhesive tape...
April 26, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28444936/blood-flow-restriction-attenuates-eccentric-exercise-induced-muscle-damage-without-perceptual-and-cardiovascular-overload
#15
Victor M Curty, Alexandre B Melo, Leonardo C Caldas, Lucas Guimarães-Ferreira, Nuno F de Sousa, Paula F Vassallo, Elisardo C Vasquez, Valério G Barauna
The aim of this study was to evaluate the acute effects of high-intensity eccentric exercise (HI-ECC) combined with blood flow restriction (BFR) on muscle damage markers, and perceptual and cardiovascular responses. Nine healthy men (26 ± 1 years, BMI 24 ± 1 kg m(-) ²) underwent unilateral elbow extension in two conditions: without (HI-ECC) and with BFR (HI-ECC+BFR). The HI-ECC protocol corresponded to three sets of 10 repetitions with 130% of maximal strength (1RM). The ratings of perceived exertion (RPE) and pain (RPP) were measured after each set...
April 26, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28444935/hydration-status-influences-the-measurement-of-arterial-stiffness
#16
Aaron R Caldwell, Matthew A Tucker, Jenna Burchfield, Nicole E Moyen, Alf Z Satterfield, Ashley Six, Brendon P McDermott, Sean W Mulvenon, Matthew S Ganio
Consensus guidelines have attempted to standardize the measurement and interpretation of pulse wave velocity (PWV); however, guidelines have not addressed whether hydration status affects PWV. Moreover, multiple studies have utilized heat stress to reduce arterial stiffness which may lead to dehydration. This study utilized two experiments to investigate the effects of dehydration on PWV at rest and during passive heat stress. In experiment 1, subjects (n = 19) completed two trials, one in which they arrived euhydrated and one dehydrated (1·2[1·0]% body mass loss)...
April 26, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28444930/does-postexercise-modelled-capillary-blood-flow-accurately-reflect-cardiovascular-effects-by-different-exercise-intensities
#17
F Stöcker, C Von Oldershausen, F K Paternoster, T Schulz, R Oberhoffer
Blood flow (BF) in exercising muscles is an important factor for exercise capacity. Recently, a non-invasive method to estimate capillary BF (Qcap ) was introduced. Using this method, the Fick principle is re-arranged by using relative differences in deoxygenated haemoglobin (ΔHHb) as a surrogate for arteriovenous O2 difference and pulmonary oxygen uptake (VO2 ) instead of muscular oxygen uptake. The aim of this study was to examine (I) the relationship between Qcap and exercise intensity during and following exercise, and (II) to critically reflect the Qcap approach...
April 26, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28444896/agreement-between-finger-plethysmography-and-brachial-oscillometry-derived-blood-pressure-measurements
#18
Philip D Allan, Terrence O'Donnell, Yu-Chieh Tzeng
PURPOSE: Blood pressure (BP) is commonly assessed by brachial oscillometry in clinical practice, whereas in physiological studies, finger plethysmography is often employed. This study assessed the limits of agreement between BP metrics obtained from each device. METHODS: In 96 participants, we simultaneously recorded BP by brachial oscillometry (BP+; Uscom, Sydney, NSW, Australia) and finger plethysmography (Finometer MIDI, MLE1054-V; Finapres Medical Systems B...
April 26, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28419771/aspects-of-carotid-structure-and-function-in-health-and-different-stages-of-chronic-kidney-disease
#19
Anna M Asp, Carin Wallquist, Anette Rickenlund, Britta Hylander, Stefan H Jacobson, Kenneth Caidahl, Maria J Eriksson
INTRODUCTION: Arterial remodelling and stiffening have been demonstrated in end-stage renal disease (ESRD). The presence of vascular alterations in earlier-stage chronic kidney disease (CKD) is less studied. We evaluated vascular structure and function in mild-to-moderate CKD (stages 2-3) compared with healthy subjects and advanced CKD (stages 4-5). METHODS: Carotid ultrasound was performed in 103 non-dialysis CKD patients and 54 healthy controls. Carotid intima-media thickness (CIMT) and common carotid artery (CCA) diameter were measured...
April 16, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28419687/skeletal-muscle-analyses-agreement-between-non-contrast-and-contrast-ct-scan-measurements-of-skeletal-muscle-area-and-mean-muscle-attenuation
#20
Anne van der Werf, Ingeborg M Dekker, Martijn R Meijerink, Nicolette J Wierdsma, Marian A E de van der Schueren, Jacqueline A E Langius
Low skeletal muscle area (SMA) and muscle radiation attenuation (MRA) have been associated with poor prognosis in various patient populations. Both non-contrast and contrast CT scans are used to determine SMA and MRA. The effect of the use of a contrast agent on SMA and MRA is unknown. Therefore, we investigated agreement between these two scan options. SMA and MRA of 41 healthy individuals were analysed on a paired non-contrast and contrast single CT scan, and agreement between paired scan results was assessed with use of Bland-Altman plots, intraclass correlation coefficients (ICCs), standard error of measurements (SEM) and smallest detectable differences at a 95% confidence level (SDD95 )...
April 16, 2017: Clinical Physiology and Functional Imaging
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