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D'Alesio G, Stumpp LI, Sciarrone P, Navari A, Gentile F, Borrelli C, Ballanti S, Degl'Innocenti E, Carrasco A, Costa AC, Andrade A, Mannini A, Macefield VG, Emdin M, Passino C, Mazzoni A, Giannoni A, Oddo CM. An open computational toolbox to analyze multi- and single-unit sympathetic nerve activity in microneurography. BIOPHYSICS REVIEWS 2024; 5:021401. [PMID: 38895135 PMCID: PMC11184970 DOI: 10.1063/5.0202385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Accepted: 05/08/2024] [Indexed: 06/21/2024]
Abstract
Microelectrode recordings from human peripheral and cranial nerves provide a means to study both afferent and efferent axonal signals at different levels of detail, from multi- to single-unit activity. Their analysis can lead to advancements both in diagnostic and in the understanding of the genesis of neural disorders. However, most of the existing computational toolboxes for the analysis of microneurographic recordings are limited in scope or not open-source. Additionally, conventional burst-based metrics are not suited to analyze pathological conditions and are highly sensitive to distance of the microelectrode tip from the active axons. To address these challenges, we developed an open-source toolbox that offers advanced analysis capabilities for studying neuronal reflexes and physiological responses to peripheral nerve activity. Our toolbox leverages the observation of temporal sequences of action potentials within inherently cyclic signals, introducing innovative methods and indices to enhance analysis accuracy. Importantly, we have designed our computational toolbox to be accessible to novices in biomedical signal processing. This may include researchers and professionals in healthcare domains, such as clinical medicine, life sciences, and related fields. By prioritizing user-friendliness, our software application serves as a valuable resource for the scientific community, allowing to extract advanced metrics of neural activity in short time and evaluate their impact on other physiological variables in a consistent and standardized manner, with the final aim to widen the use of microneurography among researchers and clinicians.
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Affiliation(s)
- Giacomo D'Alesio
- The BioRobotics Institute, Scuola Superiore Sant'Anna, Pisa, Italy
| | | | | | - Alessandro Navari
- Cardiovascular Medicine Department, Fondazione Toscana Gabriele Monasterio, Pisa, Italy
| | | | - Chiara Borrelli
- Medical Research Center, University of Iowa, Iowa City, Iowa, USA
| | - Sara Ballanti
- The BioRobotics Institute, Scuola Superiore Sant'Anna, Pisa, Italy
| | | | | | | | - Alexandre Andrade
- Instituto de Biofísica e Engenharia Biomédica, Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal
| | - Andrea Mannini
- Artificial Intelligence for Rehabilitation Laboratory, Fondazione Don Carlo Gnocchi IRCCS, Florence, Italy
| | | | | | | | - Alberto Mazzoni
- The BioRobotics Institute, Scuola Superiore Sant'Anna, Pisa, Italy
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Andrade DC, Arce‐Álvarez A, Salazar‐Ardiles C, Toledo C, Guerrero‐Henriquez J, Alvarez C, Vasquez‐Muñoz M, Izquierdo M, Millet GP. Hypoxic peripheral chemoreflex stimulation-dependent cardiorespiratory coupling is decreased in swimmer athletes. Physiol Rep 2024; 12:e15890. [PMID: 38195247 PMCID: PMC10776339 DOI: 10.14814/phy2.15890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 11/07/2023] [Accepted: 11/21/2023] [Indexed: 01/11/2024] Open
Abstract
Swimmer athletes showed a decreased ventilatory response and reduced sympathetic activation during peripheral hypoxic chemoreflex stimulation. Based on these observations, we hypothesized that swimmers develop a diminished cardiorespiratory coupling due to their decreased hypoxic peripheral response. To resolve this hypothesis, we conducted a study using coherence time-varying analysis to assess the cardiorespiratory coupling in swimmer athletes. We recruited 12 trained swimmers and 12 control subjects for our research. We employed wavelet time-varying spectral coherence analysis to examine the relationship between the respiratory frequency (Rf ) and the heart rate (HR) time series during normoxia and acute chemoreflex activation induced by five consecutive inhalations of 100% N2 . Comparing swimmers to control subjects, we observed a significant reduction in the hypoxic ventilatory responses to N2 in swimmers (0.012 ± 0.001 vs. 0.015 ± 0.001 ΔVE /ΔVO2 , and 0.365 ± 0.266 vs. 1.430 ± 0.961 ΔVE /ΔVCO2 /ΔSpO2 , both p < 0.001, swimmers vs. control, respectively). Furthermore, the coherence at the LF cutoff during hypoxia was significantly lower in swimmers compared to control subjects (20.118 ± 3.502 vs. 24.935 ± 3.832 area under curve [AUC], p < 0.012, respectively). Our findings strongly indicate that due to their diminished chemoreflex control, swimmers exhibited a substantial decrease in cardiorespiratory coupling during hypoxic stimulation.
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Affiliation(s)
- David C. Andrade
- Exercise Applied Physiology Laboratory, Centro de Investigación en Fisiología y Medicina de Altura (FIMEDALT), Departamento Biomedico, Facultad de Ciencias de la SaludUniversidad de AntofagastaAntofagastaChile
| | - Alexis Arce‐Álvarez
- Escuela de Kinesiología, Facultad de Odontología y Ciencias de la RehabilitaciónUniversidad San SebastiánSantiagoChile
| | - Camila Salazar‐Ardiles
- Exercise Applied Physiology Laboratory, Centro de Investigación en Fisiología y Medicina de Altura (FIMEDALT), Departamento Biomedico, Facultad de Ciencias de la SaludUniversidad de AntofagastaAntofagastaChile
- NavarrabiomedHospital Universitario de Navarra (UHN), Universidad Pública de Navarra (UPNA), IdiSNAPamplonaNavarraSpain
| | - Camilo Toledo
- Laboratory of Cardiorespiratory and Sleep Physiology. Institute of Physiology. Faculty of MedicineUniversidad Austral de ChileValdiviaChile
| | - Juan Guerrero‐Henriquez
- Centro de Investigación en Fisiología y Medicina de Altura (FIMEDALT), Departamento de Ciencias de la Rehabilitación y el Movimiento Humano, Facultad de Ciencias de la SaludUniversidad de AntofagastaAntofagastaChile
| | - Cristian Alvarez
- Exercise and Rehabilitation Sciences Institute, School of Physical Therapy, Faculty of Rehabilitation SciencesUniversidad Andres BelloSantiagoChile
| | - Manuel Vasquez‐Muñoz
- Dirección de Docencia de Especialidades Médicas, Dirección de Postgrado, Facultad de Medicina y Ciencias de la SaludUniversidad MayorSantiagoChile
| | - Mikel Izquierdo
- NavarrabiomedHospital Universitario de Navarra (UHN), Universidad Pública de Navarra (UPNA), IdiSNAPamplonaNavarraSpain
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Chao-Ecija A, Dawid-Milner MS. BaroWavelet: An R-based tool for dynamic baroreflex evaluation through wavelet analysis techniques. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2023; 242:107758. [PMID: 37688995 DOI: 10.1016/j.cmpb.2023.107758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 07/28/2023] [Accepted: 08/07/2023] [Indexed: 09/11/2023]
Abstract
BACKGROUND AND OBJECTIVE Baroreflex sensitivity constitutes an indicator of the function of the baroreceptor control mechanism of blood pressure levels. It can be computed after estimating heart rate and blood pressure variability. We propose a novel tool for the evaluation of baroreflex sensitivity using wavelet analysis methods. This tool, known as BaroWavelet, incorporates an algorithm proposal based on the analysis methodology of the RHRV software package, as well as other conventional techniques. Our objectives are to develop and evaluate the tool, by testing its ability to detect changes in baroreflex sensitivity in humans. METHODS The code for this tool was designed in the R programming environment and was organized into two analysis routines and a graphical interface. Simulated recordings of blood pressure and inter-beat intervals were employed for an initial evaluation of the tool in a controlled environment. Finally, similar recordings obtained during supine and orthostatic postural evaluations, from patients that belonged to the open-access EUROBAVAR data set, were analyzed. RESULTS BaroWavelet identified the scripted changes of the baroreflex sensitivity in the simulated data. The algorithm proposal was also able to better retain additional information regarding the dynamics of the baroreflex. In the EUROBAVAR subjects, baroreflex sensitivity components were significantly smaller during orthostatism when compared with the supine position. CONCLUSIONS BaroWavelet managed to characterize baroreflex dynamics from the recordings, which were consistent with the findings reported in the literature. This demonstrates its effectiveness to perform these analyses. We suggest that this tool may be of use in research and for the evaluation of baroreflex sensitivity with clinical and therapeutic purposes. The new tool is available at the official GitHub repository of the Autonomic Nervous System Unit of the University of Málaga (https://github.com/CIMES-USNA-UMA/BaroWavelet).
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Affiliation(s)
- A Chao-Ecija
- Autonomic Nervous System Unit, CIMES, School of Medicine, University of Málaga, Spain
| | - M S Dawid-Milner
- Autonomic Nervous System Unit, CIMES, School of Medicine, University of Málaga, Spain; Instituto de Investigación Biomédica de Málaga (IBIMA), Málaga, Spain.
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Fadil R, Huether AXA, Sadeghian F, Verma AK, Blaber AP, Lou JS, Tavakolian K. The Effect of Skeletal Muscle-Pump on Blood Pressure and Postural Control in Parkinson's Disease. Cardiovasc Eng Technol 2023; 14:755-773. [PMID: 37749359 DOI: 10.1007/s13239-023-00685-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 09/06/2023] [Indexed: 09/27/2023]
Abstract
PURPOSE Activation of the calf (gastrocnemius and soleus) and tibialis anterior muscles play an important role in blood pressure regulation (via muscle-pump mechanism) and postural control. Parkinson's disease is associated with calf (and tibialis anterior muscles weakness and stiffness, which contribute to postural instability and associated falls. In this work, we studied the role of the medial and lateral gastrocnemius, tibialis anterior, and soleus muscle contractions in maintaining blood pressure and postural stability in Parkinson's patients and healthy controls during standing. In addition, we investigated whether the activation of the calf and tibialis anterior muscles is baroreflex dependent or postural-mediated. METHODS We recorded electrocardiogram, blood pressure, center of pressure as a measure of postural sway, and muscle activity from the medial and lateral gastrocnemius, tibialis anterior, and soleus muscles from twenty-six Parkinson's patients and eighteen sex and age-matched healthy controls during standing and with eyes open. The interaction and bidirectional causalities between the cardiovascular, musculoskeletal, and postural variables were studied using wavelet transform coherence and convergent cross-mapping techniques, respectively. RESULTS Parkinson's patients experienced a higher postural sway and demonstrated mechanical muscle-pump dysfunction of all individual leg muscles, all of which contribute to postural instability. Moreover, our results showed that coupling between the cardiovascular, musculoskeletal, and postural variables is affected by Parkinson's disease while the contribution of the calf and tibialis anterior muscles is greater for blood pressure regulation than postural sway. CONCLUSION The outcomes of this study could assist in the development of appropriate physical exercise programs that target lower limb muscles to improve the muscle-pump function and reduce postural instability in Parkinson's disease.
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Affiliation(s)
- Rabie Fadil
- Biomedical Engineering Program, University of North Dakota, Grand Forks, ND, USA
| | - Asenath X A Huether
- Parkinson Disease Research Laboratory, Department of Neurology, Sanford Health, Fargo, ND, USA
| | - Farshid Sadeghian
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada
| | - Ajay K Verma
- Biomedical Engineering Program, University of North Dakota, Grand Forks, ND, USA
| | - Andrew P Blaber
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada
| | - Jau-Shin Lou
- Parkinson Disease Research Laboratory, Department of Neurology, Sanford Health, Fargo, ND, USA
- Department of Neurology, University of North Dakota, School of Medicine, and Health Sciences, Grand Forks, USA
| | - Kouhyar Tavakolian
- Biomedical Engineering Program, University of North Dakota, Grand Forks, ND, USA.
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada.
- Biomedical Engineering Program, University of North Dakota, 243 Centennial Drive, Upson Hall II, Room 11, Grand Forks, ND, 58202, USA.
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Hoenemann JN, Moestl S, Diedrich A, Mulder E, Frett T, Petrat G, Pustowalow W, Arz M, Schmitz MT, Heusser K, Lee SMC, Jordan J, Tank J, Hoffmann F. Impact of daily artificial gravity on autonomic cardiovascular control following 60-day head-down tilt bed rest. Front Cardiovasc Med 2023; 10:1250727. [PMID: 37953766 PMCID: PMC10634666 DOI: 10.3389/fcvm.2023.1250727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 10/04/2023] [Indexed: 11/14/2023] Open
Abstract
Impaired cardiovascular autonomic control following space flight or immobilization may limit the ability to cope with additional hemodynamic stimuli. Head-down tilt bedrest is an established terrestrial analog for space flight and offers the opportunity to test potential countermeasures for autonomic cardiovascular deconditioning. Previous studies revealed a possible benefit of daily artificial gravity on cardiovascular autonomic control following head-down tilt bedrest, but there is a need for efficiency in a long-term study before an artificial gravity facility would be brought to space. We hypothesized that artificial gravity through short-arm centrifugation attenuates functional adaptions of autonomic function during head-down tilt bed rest. 24 healthy persons (8 women, 33.4 ± 9.3 years, 24.3 ± 2.1 kg/m2) participated in the 60-day head-down tilt bed rest (AGBRESA) study. They were assigned to three groups, 30 min/day continuous, or 6(5 min intermittent short-arm centrifugation, or a control group. We assessed autonomic cardiovascular control in the supine position and in 5 minutes 80° head-up tilt position before and immediately after bed rest. We computed heart rate variability (HRV) in the time (rmssd) and frequency domain, blood pressure variability, and baroreflex sensitivity (BRS). RR interval corrected rmssd was reduced supine (p = 0.0358) and during HUT (p = 0.0161). Heart rate variability in the high-frequency band (hf-RRI; p = 0.0004) and BRS (p < 0.0001) decreased, whereas blood pressure variability in the low-frequency band (lf-SBP, p = 0.0008) increased following bedrest in all groups. We did not detect significant interactions between bedrest and interventions. We conclude that up to daily 30 min of artificial gravity on a short-arm centrifuge with 1Gz at the center of mass do not suffice to prevent changes in autonomic cardiovascular control following 60-day of 6° head-down tilt bed rest. Clinical Trial Registration: https://drks.de/search/en/trial/DRKS00015677, identifier, DRKS00015677.
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Affiliation(s)
- J.-N. Hoenemann
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
- Department of Internal Medicine III, Division of Cardiology, Pneumology, Angiology, and Intensive Care, University of Cologne, Cologne, Germany
| | - S. Moestl
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - A. Diedrich
- Department of Medicine, Division of Clinical Pharmacology, Autonomic Dysfunction Service, Vanderbilt University, Nashville, TN, United States
| | - E. Mulder
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - T. Frett
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - G. Petrat
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - W. Pustowalow
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - M. Arz
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - M.-T. Schmitz
- Institute of Medical Biometry, Informatics and Epidemiology (IMBIE), University Hospital Bonn, Bonn, Germany
| | - K. Heusser
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - S. M. C. Lee
- Wyle Laboratories, Life Sciences and Systems Division, Houston, TX, United States
| | - J. Jordan
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
- Head of Aerospace Medicine, University of Cologne, Germany, Cologne
| | - J. Tank
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - F. Hoffmann
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
- Department of Internal Medicine III, Division of Cardiology, Pneumology, Angiology, and Intensive Care, University of Cologne, Cologne, Germany
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Wingenbach TSH, Peyk P, Pfaltz MC. It does not need two: Assessing physiological linkage from videos across the valence dimension. Psychophysiology 2023; 60:e14317. [PMID: 37118949 DOI: 10.1111/psyp.14317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 03/28/2023] [Accepted: 04/03/2023] [Indexed: 04/30/2023]
Abstract
The phenomenon of physiological linkage describes similar fluctuations of two individuals' physiology, for example, the cardiac inter-beat interval (IBI). Physiological linkage is a well-documented occurrence in research settings of interacting dyads but the literature on non-interacting dyads, that is, someone watching a video of another person, is sparse. The current study investigated whether physiological linkage, based on IBI, occurs from watching videos where strangers report about personal (neutral, positive, negative non-traumatic, and negative traumatic) experiences. Videos were produced with six individuals and then presented to observers (N = 26). Time-frequency-domain cross-wavelet analyses supplemented by threshold-free cluster enhancement (TFCE; to account for multiple testing) showed significant physiological linkage between the IBI of observers and persons in the videos for 16 out of the 21 tested videos. Although significant physiological linkage also emerged for neutral videos and positive, negative valence videos led to such associations more reliably. This study shows that physiological linkage can be investigated in highly controlled conditions based on video stimuli paving the path for experimental manipulation in future research. Furthermore, due to the provision of information on time and frequency, the use of cross-wavelet analysis is encouraged to learn more about factors modulating physiological linkage. The current study presents the next step toward identifying psychophysiological causal and modulating factors of physiological linkage.
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Affiliation(s)
- Tanja S H Wingenbach
- Department of Consultation-Liaison Psychiatry and Psychosomatic Medicine, University Hospital Zurich, Zurich, Switzerland
- Faculty of Medicine Zurich, University of Zurich, Zurich, Switzerland
- Faculty of Education, Health, and Human Sciences, School of Human Sciences, University of Greenwich, London, UK
| | - Peter Peyk
- Department of Consultation-Liaison Psychiatry and Psychosomatic Medicine, University Hospital Zurich, Zurich, Switzerland
| | - Monique C Pfaltz
- Department of Consultation-Liaison Psychiatry and Psychosomatic Medicine, University Hospital Zurich, Zurich, Switzerland
- Faculty of Medicine Zurich, University of Zurich, Zurich, Switzerland
- Department of Psychology and Social Work, Mid Sweden University, Sundsvall, Sweden
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Booth JM, Giomi F, Daffonchio D, McQuaid CD, Fusi M. Disturbance of primary producer communities disrupts the thermal limits of the associated aquatic fauna. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 872:162135. [PMID: 36775146 DOI: 10.1016/j.scitotenv.2023.162135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 01/25/2023] [Accepted: 02/05/2023] [Indexed: 06/18/2023]
Abstract
Environmental fluctuation forms a framework of variability within which species have evolved. Environmental fluctuation includes predictability, such as diel cycles of aquatic oxygen fluctuation driven by primary producers. Oxygen availability and fluctuation shape the physiological responses of aquatic animals to warming, so that, in theory, oxygen fluctuation could influence their thermal ecology. We describe annual oxygen variability in agricultural drainage channels and show that disruption of oxygen fluctuation through dredging of plants reduces the thermal tolerance of freshwater animals. We compared the temperature responses of snails, amphipods, leeches and mussels exposed to either natural oxygen fluctuation or constant oxygen in situ under different acclimation periods. Oxygen saturation in channel water ranged from c. 0 % saturation at night to >300 % during the day. Temperature showed normal seasonal variation and was almost synchronous with daily oxygen fluctuation. A dredging event in 2020 dramatically reduced dissolved oxygen variability and the correlation between oxygen and temperature was lost. The tolerance of invertebrates to thermal stress was significantly lower when natural fluctuation in oxygen availability was reduced and decoupled from temperature. This highlights the importance of natural cycles of variability and the need to include finer scale effects, including indirect biological effects, in modelling the ecosystem-level consequences of climate change. Furthermore, restoration and management of primary producers in aquatic habitats could be important to improve the thermal protection of aquatic invertebrates and their resistance to environmental variation imposed by climate change.
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Affiliation(s)
- J M Booth
- Coastal Research Group, Department of Zoology and Entomology, Rhodes University, Grahamstown, South Africa.
| | - F Giomi
- Via Maniciati, 6, Padova, Italy
| | - D Daffonchio
- King Abdullah University of Science and Technology (KAUST), Biological and Environmental Sciences and Engineering Division (BESE), Red Sea Research Center (RSRC), Thuwal 23955-6900, Saudi Arabia
| | - C D McQuaid
- Coastal Research Group, Department of Zoology and Entomology, Rhodes University, Grahamstown, South Africa
| | - M Fusi
- Centre for Conservation and Restoration Science, School of Applied Sciences, Edinburgh Napier University, Edinburgh, UK; Present address: Joint Nature Conservation Committee, Peterborough PE1 1JY, UK.
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Zigmantaitė V, Jonušaitė E, Grigalevičiūtė R, Kučinskas A, Treinys R, Navalinskas A, Žvikas V, Jakštas V, Pudžiuvelytė L, Bernatonienė J, Mačianskienė R, Jurevičius J. Evaluation of the Cardiac Electrophysiological and Haemodynamic Effects of Elsholtzia ciliata Essential Oil on Swine. Pharmaceuticals (Basel) 2022; 15:ph15080982. [PMID: 36015131 PMCID: PMC9414655 DOI: 10.3390/ph15080982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 08/01/2022] [Accepted: 08/06/2022] [Indexed: 11/16/2022] Open
Abstract
The demand for the development of novel medicines with few side effects and no proarrhythmic properties is increasing. Extensive research on herbal extracts has been conducted with the expectation that the compounds will exert precise effects without harmful side effects. Elsholtzia ciliata (Thunb.) Hyl. essential oil (EO) possesses antiarrhythmic properties similar to those of class 1B antiarrhythmics, such as prolonging myocardial activation of the QRS complex and shortening the QT interval. In this study, we determined the kinetic profile of EO phytocompounds and the effects of EO on heart electrical activity and arterial blood pressure. For this study, we chose to use local breed pigs that were anaesthetized. The effects of an intravenous bolus of EO on ECG parameters, arterial blood pressure, heart rate variability, and blood levels of haematological and biochemical parameters were registered and evaluated. Following an intravenous injection of a bolus, EO exerted a vasodilatory effect, resulting in significant reductions in arterial blood pressure. EO also increased the heart rate and altered ECG parameters. The bolus of EO prolonged the QRS complex, shortened the QT interval, and nonmonotonically altered the PQ interval. After the administration of a bolus of EO, the activity of the autonomic nervous system was altered. This study confirms that EO possesses similar properties to class 1B antiarrhythmics and exerts a hypotensive effect; it reduces arterial blood pressure possibly by modulating peripheral vascular resistance.
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Affiliation(s)
- Vilma Zigmantaitė
- Biological Research Center, Lithuanian University of Health Sciences, Tilžės St. 18/7, LT47181 Kaunas, Lithuania
- Correspondence: ; Tel.: +370-675-36043
| | - Eglė Jonušaitė
- Biological Research Center, Lithuanian University of Health Sciences, Tilžės St. 18/7, LT47181 Kaunas, Lithuania
| | - Ramunė Grigalevičiūtė
- Biological Research Center, Lithuanian University of Health Sciences, Tilžės St. 18/7, LT47181 Kaunas, Lithuania
| | - Audrius Kučinskas
- Biological Research Center, Lithuanian University of Health Sciences, Tilžės St. 18/7, LT47181 Kaunas, Lithuania
| | - Rimantas Treinys
- Laboratory of Membrane Biophysics, Institute of Cardiology, Lithuanian University of Health Sciences, Sukilėlių Ave. 15, LT50162 Kaunas, Lithuania
| | - Antanas Navalinskas
- Laboratory of Membrane Biophysics, Institute of Cardiology, Lithuanian University of Health Sciences, Sukilėlių Ave. 15, LT50162 Kaunas, Lithuania
| | - Vaidotas Žvikas
- Institute of Pharmaceutical Technologies, Faculty of Pharmacy, Lithuanian University of Health Sciences, Sukilėlių Ave. 13, LT50162 Kaunas, Lithuania
| | - Valdas Jakštas
- Institute of Pharmaceutical Technologies, Faculty of Pharmacy, Lithuanian University of Health Sciences, Sukilėlių Ave. 13, LT50162 Kaunas, Lithuania
- Laboratory of Biopharmaceutical Research, Institute of Pharmaceutical Technologies, Faculty of Pharmacy, Medical Academy, Lithuanian University of Health Sciences, Sukilėlių Ave. 13, LT50162 Kaunas, Lithuania
| | - Lauryna Pudžiuvelytė
- Institute of Pharmaceutical Technologies, Faculty of Pharmacy, Lithuanian University of Health Sciences, Sukilėlių Ave. 13, LT50162 Kaunas, Lithuania
- Department of Drug Technology and Social Pharmacy, Medical Academy, Lithuanian University of Health Sciences, Sukilėlių Ave. 13, LT50162 Kaunas, Lithuania
| | - Jurga Bernatonienė
- Institute of Pharmaceutical Technologies, Faculty of Pharmacy, Lithuanian University of Health Sciences, Sukilėlių Ave. 13, LT50162 Kaunas, Lithuania
- Department of Drug Technology and Social Pharmacy, Medical Academy, Lithuanian University of Health Sciences, Sukilėlių Ave. 13, LT50162 Kaunas, Lithuania
| | - Regina Mačianskienė
- Laboratory of Membrane Biophysics, Institute of Cardiology, Lithuanian University of Health Sciences, Sukilėlių Ave. 15, LT50162 Kaunas, Lithuania
| | - Jonas Jurevičius
- Laboratory of Membrane Biophysics, Institute of Cardiology, Lithuanian University of Health Sciences, Sukilėlių Ave. 15, LT50162 Kaunas, Lithuania
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Yeh SJ, Lung CW, Jan YK, Liau BY. Advanced Cross-Correlation Function Application to Identify Arterial Baroreflex Sensitivity Variations From Healthy to Diabetes Mellitus. Front Neurosci 2022; 16:812302. [PMID: 35757548 PMCID: PMC9226378 DOI: 10.3389/fnins.2022.812302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 05/13/2022] [Indexed: 11/13/2022] Open
Abstract
Diabetes mellitus (DM) is a chronic disease characterized by elevated blood glucose levels, which leads over time to serious damage to the heart, blood vessels, eyes, kidneys, and nerves. DM is of two types–types 1 or 2. In type 1, there is a problem with insulin secretion, and in type 2–insulin resistance. About 463 million people worldwide have diabetes, and 80% of the majority live in low- and middle-income countries, and 1.5 million deaths are directly attributed to diabetes each year. Autonomic neuropathy (AN) is one of the common diabetic complications, leading to failure in blood pressure (BP) control and causing cardiovascular disease. Therefore, early detection of AN becomes crucial to optimize treatment. We propose an advanced cross-correlation function (ACCF) between BP and heart rate with suitable threshold parameters to analyze and detect early changes in baroreflex sensitivity (BRS) in DM with AN (DM+). We studied heart rate (HR) and systolic BP responses during tilt in 16 patients with diabetes mellitus only (DM−), 19 diabetes mellitus with autonomic dysfunction (DM+), and 10 healthy subjects. The ACCF analysis revealed that the healthy and DM groups had different filtered percentages of significant maximum cross-correlation function (CCF) value (p < 0.05), and the maximum CCF value after thresholds was significantly reduced during tilt in the DM+ group (p < 0.05). The maximum CCF index, a parameter for the phase between HR and BP, separated the healthy group from the DM groups (p < 0.05). Due to the maximum CCF index in DM groups being located in the positive range and significantly different from healthy ones, it could be speculated that BRS dysfunction in DM and AN could cause a phase change from lead to lag. ACCF could detect and separate DM+ from DM groups. This fact could represent an advantage of the ACCF algorithm. A common cross-correlation analysis was not easy to distinguish between DM− and DM+. This pilot study demonstrates that ACCF analysis with suitable threshold parameters could explore hidden changes in baroreflex control in DM+ and DM−. Furthermore, the superiority of this ACCF algorithm is useful in distinguishing whether AN is present or not in DM.
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Affiliation(s)
- Shoou-Jeng Yeh
- Section of Neurology and Neurophysiology, Cheng-Ching General Hospital, Taichung, Taiwan
| | - Chi-Wen Lung
- Department of Creative Product Design, Asia University, Taichung, Taiwan.,Rehabilitation Engineering Laboratory, Kinesiology and Community Health, Computational Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, United States
| | - Yih-Kuen Jan
- Rehabilitation Engineering Laboratory, Kinesiology and Community Health, Computational Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, United States
| | - Ben-Yi Liau
- Department of Biomedical Engineering, Hungkuang University, Taichung, Taiwan
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10
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Ku T, Zida SI, Harfiya LN, Li YH, Lin YD. A Novel Method for Baroreflex Sensitivity Estimation Using Modulated Gaussian Filter. SENSORS 2022; 22:s22124618. [PMID: 35746400 PMCID: PMC9230694 DOI: 10.3390/s22124618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/10/2022] [Accepted: 06/14/2022] [Indexed: 11/16/2022]
Abstract
The evaluation of baroreflex sensitivity (BRS) has proven to be critical for medical applications. The use of α indices by spectral methods has been the most popular approach to BRS estimation. Recently, an algorithm termed Gaussian average filtering decomposition (GAFD) has been proposed to serve the same purpose. GAFD adopts a three-layer tree structure similar to wavelet decomposition but is only constructed by Gaussian windows in different cutoff frequency. Its computation is more efficient than that of conventional spectral methods, and there is no need to specify any parameter. This research presents a novel approach, referred to as modulated Gaussian filter (modGauss) for BRS estimation. It has a more simplified structure than GAFD using only two bandpass filters of dedicated passbands, so that the three-level structure in GAFD is avoided. This strategy makes modGauss more efficient than GAFD in computation, while the advantages of GAFD are preserved. Both GAFD and modGauss are conducted extensively in the time domain, yet can achieve similar results to conventional spectral methods. In computational simulations, the EuroBavar dataset was used to assess the performance of the novel algorithm. The BRS values were calculated by four other methods (three spectral approaches and GAFD) for performance comparison. From a comparison using the Wilcoxon rank sum test, it was found that there was no statistically significant dissimilarity; instead, very good agreement using the intraclass correlation coefficient (ICC) was observed. The modGauss algorithm was also found to be the fastest in computation time and suitable for the long-term estimation of BRS. The novel algorithm, as described in this report, can be applied in medical equipment for real-time estimation of BRS in clinical settings.
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Affiliation(s)
- Tienhsiung Ku
- Department of Anesthesiology, Changhua Christian Hospital, Changhua 50051, Taiwan;
| | - Serge Ismael Zida
- Ph.D. Program of Electrical and Communications Engineering, Feng Chia University, Taichung 40724, Taiwan;
| | - Latifa Nabila Harfiya
- Department of Computer Science and Information Engineering, National Central University, Taoyuan 32001, Taiwan; (L.N.H.); or (Y.-H.L.)
| | - Yung-Hui Li
- Department of Computer Science and Information Engineering, National Central University, Taoyuan 32001, Taiwan; (L.N.H.); or (Y.-H.L.)
- AI Research Center, Hon Hai (Foxconn) Research Institute, Taipei 114699, Taiwan
| | - Yue-Der Lin
- Ph.D. Program of Electrical and Communications Engineering, Feng Chia University, Taichung 40724, Taiwan;
- Department of Automatic Control Engineering, Feng Chia University, Taichung 40724, Taiwan
- Correspondence: ; Tel.: +886-4-2451-7250 (ext. 3925); Fax: +886-4-2451-9951
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11
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Karemaker JM. The multibranched nerve: vagal function beyond heart rate variability. Biol Psychol 2022; 172:108378. [PMID: 35688294 DOI: 10.1016/j.biopsycho.2022.108378] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 05/26/2022] [Accepted: 06/02/2022] [Indexed: 11/02/2022]
Abstract
This paper reviews the many functions of the vagus nerve, to understand how they interact in daily life and what might be accomplished by therapeutical electrical stimulation. A short historical introduction on the discovery and name-giving of the cranial nerves numbers 9-12 is followed by an overview of the functions that are under lower brain stem control: heart (rate, contractility), intestine (swallowing, peristalsis and glands secretions, feeling of satiety), lungs (bronchoconstriction, lung-irritant and stretch receptor signaling), blood pressure (by vascular wall stress sensing) and blood gases by specialized receptors. Key in the review is the physiology behind beat-by-beat heart rate variations, how everyday life is reflected in its variability, from exciting moments to quiet sleep, with the 'common faint' or vasovagal collapse as extreme example. Next, the recently proposed role of the vagus nerve in limiting inflammation is discussed. This has led to adoption of an earlier developed technique for epilepsy treatment, i.e., electrical stimulation of one vagus nerve bundle in the neck, but now for immune diseases like rheumatoid arthritis and the scope is even widening to depression and cluster headache. However, the problem in application of whole vagus nerve stimulation is the lack of specificity: there is no way to titrate the stimulation to an observable effect variable. All nerves in the bundle, incoming and outgoing, can be 'hit', leading to side-effects which limit the intended application.
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Affiliation(s)
- John M Karemaker
- Location AMC: Amsterdam UMC, University of Amsterdam, Dept of Medical Biology, section Systems Physiology, Meibergdreef 9, 1105 AZ Amsterdam, the Netherlands.
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12
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Clemson PT, Hoag JB, Cooke WH, Eckberg DL, Stefanovska A. Beyond the Baroreflex: A New Measure of Autonomic Regulation Based on the Time-Frequency Assessment of Variability, Phase Coherence and Couplings. FRONTIERS IN NETWORK PHYSIOLOGY 2022; 2:891604. [PMID: 36926062 PMCID: PMC10013010 DOI: 10.3389/fnetp.2022.891604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 05/03/2022] [Indexed: 11/13/2022]
Abstract
For decades the role of autonomic regulation and the baroreflex in the generation of the respiratory sinus arrhythmia (RSA) - modulation of heart rate by the frequency of breathing - has been under dispute. We hypothesized that by using autonomic blockers we can reveal which oscillations and their interactions are suppressed, elucidating their involvement in RSA as well as in cardiovascular regulation more generally. R-R intervals, end tidal CO2, finger arterial pressure, and muscle sympathetic nerve activity (MSNA) were measured simultaneously in 7 subjects during saline, atropine and propranolol infusion. The measurements were repeated during spontaneous and fixed-frequency breathing, and apnea. The power spectra, phase coherence and couplings were calculated to characterise the variability and interactions within the cardiovascular system. Atropine reduced R-R interval variability (p < 0.05) in all three breathing conditions, reduced MSNA power during apnea and removed much of the significant coherence and couplings. Propranolol had smaller effect on the power of oscillations and did not change the number of significant interactions. Most notably, atropine reduced R-R interval power in the 0.145-0.6 Hz interval during apnea, which supports the hypothesis that the RSA is modulated by a mechanism other than the baroreflex. Atropine also reduced or made negative the phase shift between the systolic and diastolic pressure, indicating the cessation of baroreflex-dependent blood pressure variability. This result suggests that coherent respiratory oscillations in the blood pressure can be used for the non-invasive assessment of autonomic regulation.
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Affiliation(s)
- Philip T. Clemson
- Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, United Kingdom
- Physics Department, Lancaster University, Lancaster, United Kingdom
| | - Jeffrey B. Hoag
- Jane and Leonard Korman Respiratory Institute, Thomas Jefferson University, Philadelphia, PA, United States
| | - William H. Cooke
- Kinesiology and Integrative Physiology Department, Michigan Technological University, Houghton, MI, United States
| | - Dwain L. Eckberg
- Departments of Medicine and Physiology, Virginia Commonwealth University School of Medicine, Richmond, VA, United States
- Department of Veterans Affairs Medical Center, Richmond, VA, United States
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13
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Fadil R, Huether AXA, Verma AK, Brunnemer R, Blaber AP, Lou JS, Tavakolian K. Effect of Parkinson’s Disease on Cardio-postural Coupling During Orthostatic Challenge. Front Physiol 2022; 13:863877. [PMID: 35755448 PMCID: PMC9214860 DOI: 10.3389/fphys.2022.863877] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 05/06/2022] [Indexed: 11/13/2022] Open
Abstract
Cardiac baroreflex and leg muscles activation are two important mechanisms for blood pressure regulation, failure of which could result in syncope and falls. Parkinson’s disease is known to be associated with cardiac baroreflex impairment and skeletal muscle dysfunction contributing to falls. However, the mechanical effect of leg muscles contractions on blood pressure (muscle-pump) and the baroreflex-like responses of leg muscles to blood pressure changes is yet to be comprehensively investigated. In this study, we examined the involvement of the cardiac baroreflex and this hypothesized reflex muscle-pump function (cardio-postural coupling) to maintain blood pressure in Parkinson’s patients and healthy controls during an orthostatic challenge induced via a head-up tilt test. We also studied the mechanical effect of the heart and leg muscles contractions on blood pressure. We recorded electrocardiogram blood pressure and electromyogram from 21 patients with Parkinson’s disease and 18 age-matched healthy controls during supine, head-up tilt at 70°, and standing positions with eyes open. The interaction and bidirectional causalities between the cardiovascular and musculoskeletal signals were studied using wavelet transform coherence and convergent cross mapping techniques, respectively. Parkinson’s patients displayed an impaired cardiac baroreflex and a reduced mechanical effect of the heart on blood pressure during supine, tilt and standing positions. However, the effectiveness of the cardiac baroreflex decreased in both Parkinson’s patients and healthy controls during standing as compared to supine. In addition, Parkinson’s patients demonstrated cardio-postural coupling impairment along with a mechanical muscle pump dysfunction which both could lead to dizziness and falls. Moreover, the cardiac baroreflex had a limited effect on blood pressure during standing while lower limb muscles continued to contract and maintain blood pressure via the muscle-pump mechanism. The study findings highlighted altered bidirectional coupling between heart rate and blood pressure, as well as between muscle activity and blood pressure in Parkinson’s disease. The outcomes of this study could assist in the development of appropriate physical exercise programs to reduce falls in Parkinson’s disease by monitoring the cardiac baroreflex and cardio-postural coupling effect on maintaining blood pressure.
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Affiliation(s)
- Rabie Fadil
- Biomedical Engineering Program, University of North Dakota, Grand Forks, ND, United States
| | - Asenath X. A. Huether
- Parkinson Disease Research Laboratory, Department of Neurology, Sanford Health, Fargo, ND, United States
| | - Ajay K. Verma
- Biomedical Engineering Program, University of North Dakota, Grand Forks, ND, United States
| | - Robert Brunnemer
- Biomedical Engineering Program, University of North Dakota, Grand Forks, ND, United States
| | - Andrew P. Blaber
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada
| | - Jau-Shin Lou
- Parkinson Disease Research Laboratory, Department of Neurology, Sanford Health, Fargo, ND, United States
- School of Medicine and Health Sciences, Department of Neurology, University of North Dakota, Grand Forks, ND, United States
| | - Kouhyar Tavakolian
- Biomedical Engineering Program, University of North Dakota, Grand Forks, ND, United States
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada
- *Correspondence: Kouhyar Tavakolian,
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14
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Estimation of baroreflex sensitivity by Gaussian average filtering decomposition. Biomed Signal Process Control 2021. [DOI: 10.1016/j.bspc.2021.102576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Mol A, Slangen LRN, Trappenburg MC, Reijnierse EM, van Wezel RJA, Meskers CGM, Maier AB. Blood Pressure Drop Rate After Standing Up Is Associated With Frailty and Number of Falls in Geriatric Outpatients. J Am Heart Assoc 2020; 9:e014688. [PMID: 32223397 PMCID: PMC7428630 DOI: 10.1161/jaha.119.014688] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background The relationship between orthostatic hypotension and clinical outcome in older adults is poorly understood. Blood pressure drop rate (ie, speed of blood pressure drop) may particularly reflect the imposed challenge to the baroreflex and the associated clinical outcome (ie, frailty and number of falls). This study aimed to compare orthostatic blood pressure drop rate and drop magnitude with regard to their association with frailty and number of falls. Methods and Results Blood pressure was measured continuously during a standardized active stand task in 168 patients (mean age 81.4±7.0; 55.4% female) who visited a geriatric outpatient clinic for cognitive or mobility problems. The association of orthostatic blood pressure drop rate, blood pressure drop magnitude, and baroreflex sensitivity (ie, increase in heart rate divided by systolic blood pressure drop magnitude) with frailty (Fried criteria and 4 frailty markers) and self‐reported number of falls was assessed using linear regression models, adjusting for age and sex. Systolic blood pressure drop rate had the strongest association with frailty according to the 4 frailty markers (β 0.30; 95% CI, 0.11–0.49; P=0.003) and number of falls (β 1.09; 95% CI, 0.19–1.20; P=0.018); diastolic blood pressure drop magnitude was most strongly associated with frailty according to the Fried criteria (β 0.37; 95% CI, 0.15–0.60; P<0.001). Baroreflex sensitivity was associated with neither frailty nor number of falls. Conclusions Orthostatic blood pressure drop rate was associated with frailty and falls and may reflect the challenge to the baroreflex rather than drop magnitude.
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Affiliation(s)
- Arjen Mol
- Department of Human Movement Sciences @AgeAmsterdam Amsterdam Movement Sciences Vrije Universiteit Amsterdam the Netherlands.,Department of Biophysics Donders Institute for Brain, Cognition and Behaviour Radboud University Nijmegen the Netherlands
| | - Lois Robin Nicolle Slangen
- Department of Biophysics Donders Institute for Brain, Cognition and Behaviour Radboud University Nijmegen the Netherlands
| | - Marijke C Trappenburg
- Section of Gerontology and Geriatrics Department of Internal Medicine VU University Medical Center Amsterdam Amsterdam the Netherlands.,Department of Internal Medicine Amstelland Hospital Amstelveen the Netherlands
| | - Esmee M Reijnierse
- Department of Medicine and Aged Care @AgeMelbourne The Royal Melbourne Hospital The University of Melbourne Victoria Australia
| | - Richard J A van Wezel
- Department of Biophysics Donders Institute for Brain, Cognition and Behaviour Radboud University Nijmegen the Netherlands.,Biomedical Signals and Systems MIRA Institute for Biomedical Technology and Technical Medicine University of Twente Enschede the Netherlands
| | - Carel G M Meskers
- Department of Human Movement Sciences @AgeAmsterdam Amsterdam Movement Sciences Vrije Universiteit Amsterdam the Netherlands.,Department of Rehabilitation Medicine VU University Medical Center Amsterdam the Netherlands
| | - Andrea B Maier
- Department of Human Movement Sciences @AgeAmsterdam Amsterdam Movement Sciences Vrije Universiteit Amsterdam the Netherlands.,Department of Medicine and Aged Care @AgeMelbourne The Royal Melbourne Hospital The University of Melbourne Victoria Australia
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