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Rietz M, Schmidt-Persson J, Gillies Banke Rasmussen M, Overgaard Sørensen S, Rath Mortensen S, Brage S, Lund Kristensen P, Grøntved A, Brønd JC. Facilitating ambulatory heart rate variability analysis using accelerometry-based classifications of body position and self-reported sleep. Physiol Meas 2024; 45:055016. [PMID: 38684167 DOI: 10.1088/1361-6579/ad450d] [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: 11/05/2023] [Accepted: 04/29/2024] [Indexed: 05/02/2024]
Abstract
Objective.This study aimed to examine differences in heart rate variability (HRV) across accelerometer-derived position, self-reported sleep, and different summary measures (sleep, 24 h HRV) in free-living settings using open-source methodology.Approach.HRV is a biomarker of autonomic activity. As it is strongly affected by factors such as physical behaviour, stress, and sleep, ambulatory HRV analysis is challenging. Beat-to-beat heart rate (HR) and accelerometry data were collected using single-lead electrocardiography and trunk- and thigh-worn accelerometers among 160 adults participating in the SCREENS trial. HR files were processed and analysed in the RHRV R package. Start time and duration spent in physical behaviours were extracted, and time and frequency analysis for each episode was performed. Differences in HRV estimates across activities were compared using linear mixed models adjusted for age and sex with subject ID as random effect. Next, repeated-measures Bland-Altman analysis was used to compare 24 h RMSSD estimates to HRV during self-reported sleep. Sensitivity analyses evaluated the accuracy of the methodology, and the approach of employing accelerometer-determined episodes to examine activity-independent HRV was described.Main results.HRV was estimated for 31 289 episodes in 160 individuals (53.1% female) at a mean age of 41.4 years. Significant differences in HR and most markers of HRV were found across positions [Mean differences RMSSD: Sitting (Reference) - Standing (-2.63 ms) or Lying (4.53 ms)]. Moreover, ambulatory HRV differed significantly across sleep status, and poor agreement between 24 h estimates compared to sleep HRV was detected. Sensitivity analyses confirmed that removing the first and last 30 s of accelerometry-determined HR episodes was an accurate strategy to account for orthostatic effects.Significance.Ambulatory HRV differed significantly across accelerometry-assigned positions and sleep. The proposed approach for free-living HRV analysis may be an effective strategy to remove confounding by physical activity when the aim is to monitor general autonomic stress.
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Affiliation(s)
- Marlene Rietz
- Center for Research in Childhood Health, Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
- Division of Clinical Physiology, Department for Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Jesper Schmidt-Persson
- Center for Research in Childhood Health, Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
- Applied Research in Child and Adult Health, Department of Midwifery, Physiotherapy, Occupational Therapy, and Psychomotor Therapy, University College Copenhagen, Copenhagen, Denmark
| | - Martin Gillies Banke Rasmussen
- Center for Research in Childhood Health, Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
- Steno Diabetes Center Odense, Odense University Hospital, Odense, Denmark
| | - Sarah Overgaard Sørensen
- Center for Research in Childhood Health, Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
| | - Sofie Rath Mortensen
- Center for Research in Childhood Health, Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
- The Research and Implementation Unit PROgrez, Department of Physiotherapy and Occupational Therapy, Naestved-Slagelse-Ringsted Hospitals, Region Zealand, Denmark
| | - Søren Brage
- Center for Research in Childhood Health, Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
- MRC Epidemiology Unit, University of Cambridge, Cambridge, United Kingdom
| | - Peter Lund Kristensen
- Center for Research in Childhood Health, Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
| | - Anders Grøntved
- Center for Research in Childhood Health, Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
| | - Jan Christian Brønd
- Center for Research in Childhood Health, Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
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Richter-Laskowska M, Wawrzkiewicz-Jalowiecka A, Bies A, Trybek P. Machine Learning Methods for the Analysis of the Patch-Clamp Signals. Methods Mol Biol 2024; 2796:249-270. [PMID: 38856906 DOI: 10.1007/978-1-0716-3818-7_15] [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] [Indexed: 06/11/2024]
Abstract
Patch-clamp technique provides a unique possibility to record the ion channels' activity. This method enables tracking the changes in their functional states at controlled conditions on a real-time scale. Kinetic parameters evaluated for the patch-clamp signals form the fundamentals of electrophysiological characteristics of the channel functioning. Nevertheless, the noisy series of ionic currents flowing through the channel protein(s) seem to be bountiful of information, and the standard data processing techniques likely unravel only its part. Rapid development of artificial intelligence (AI) techniques, especially machine learning (ML), gives new prospects for whole channelology. Here we consider the question of the AI applications in the patch-clamp signal analysis. It turns out that the AI methods may not only enable for automatizing of signal analysis, but also they can be used in finding inherent patterns of channel gating and allow the researchers to uncover the details of gating machinery, which had been never considered before. In this work, we outline the currently known AI methods that turned out to be utilizable and useful in the analysis of patch-clamp signals. This chapter can be considered an introductory guide to the application of AI methods in the analysis of the time series of channel currents (together with its advantages, disadvantages, and limitations), but we also propose new possible directions in this field.
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Affiliation(s)
- Monika Richter-Laskowska
- Lukasiewicz Research Network - Krakow Institute of Technology, The Centre for Biomedical Engineering, Kraków, Poland.
| | | | - Aleksander Bies
- Faculty of Science and Technology, Institute of Computer Science, University of Silesia, Sosnowiec, Poland
| | - Paulina Trybek
- Faculty of Science and Technology, Institute of Physics, University of Silesia in Katowice, Chorzow, Poland
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Joksimović J, Perc M, Levnajić Z. Self-organization in Slovenian public spending. ROYAL SOCIETY OPEN SCIENCE 2023; 10:221279. [PMID: 37538744 PMCID: PMC10394406 DOI: 10.1098/rsos.221279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 07/10/2023] [Indexed: 08/05/2023]
Abstract
Private businesses are often entrusted with public contracts, wherein public money is allocated to a private company. This process raises concerns about transparency, even in the most developed democracies. But are there any regularities guiding this process? Do all private companies benefit equally from the state budgets? Here, we tackle these questions focusing on the case of Slovenia, which keeps excellent records of this kind of public spending. We examine a dataset detailing every transfer of public money to the private sector from January 2003 to May 2020. During this time, Slovenia has conducted business with no less than 248 989 private companies. We find that the cumulative distribution of money received per company can be reasonably well explained by a power-law or lognormal fit. We also show evidence for the first-mover advantage, and determine that companies receive new funding in a way that is roughly linear over time. These results indicate that, despite all human factors involved, Slovenian public spending is at least to some extent regulated by emergent self-organizing principles.
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Affiliation(s)
- Jelena Joksimović
- Faculty of Information Sciences in Novo Mesto, Ljubljanska cesta 31A, Novo Mesto 8000, Slovenia
| | - Matjaž Perc
- Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška cesta 160, Maribor 2000, Slovenia
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung 404332, Taiwan
- Alma Mater Europaea, Slovenska Ulica 17, Maribor 2000, Slovenia
- Complexity Science Hub Vienna, Josefstädterstrasse 39, Vienna 1080, Austria
- Department of Physics, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul, Republic of Korea
| | - Zoran Levnajić
- Faculty of Information Sciences in Novo Mesto, Ljubljanska cesta 31A, Novo Mesto 8000, Slovenia
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Geng D, Qin Z, Wang J, Gao Z, Zhao N. Personalized recognition of wake/sleep state based on the combined shapelets and K-means algorithm. Biomed Signal Process Control 2022. [DOI: 10.1016/j.bspc.2021.103132] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Shih CH, Chou PC, Chou TL, Huang TW. Measurement of Cancer-Related Fatigue Based on Heart Rate Variability: Observational Study. J Med Internet Res 2021; 23:e25791. [PMID: 36260384 PMCID: PMC8406124 DOI: 10.2196/25791] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 03/20/2021] [Accepted: 05/04/2021] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Cancer-related fatigue is a serious side effect of cancer, and its treatment can disrupt the quality of life of patients. Clinically, the standard method for assessing cancer-related fatigue relies on subjective experience retrieved from patient self-reports, such as the Brief Fatigue Inventory (BFI). However, most patients do not self-report their fatigue levels. OBJECTIVE In this study, we aim to develop an objective cancer-related fatigue assessment method to track and monitor fatigue in patients with cancer. METHODS In total, 12 patients with lung cancer who were undergoing chemotherapy or targeted therapy were enrolled. We developed frequency-domain parameters of heart rate variability (HRV) and BFI based on a wearable-based HRV measurement system. All patients completed the BFI-Taiwan version questionnaire and wore the device for 7 consecutive days to record HRV parameters such as low frequency (LF), high frequency (HF), and LF-HF ratio (LF-HF). Statistical analysis was used to map the correlation between subjective fatigue and objective data. RESULTS A moderate positive correlation was observed between the average LF-HF ratio and BFI in the sleep phase (ρ=0.86). The mapped BFI score derived by the BFI mapping method could approximate the BFI from the patient self-report. The mean absolute error rate between the subjective and objective BFI scores was 3%. CONCLUSIONS LF-HF is highly correlated with the cancer-related fatigue experienced by patients with lung cancer undergoing chemotherapy or targeted therapy. Beyond revealing fatigue levels objectively, continuous HRV recordings through the photoplethysmography watch device and the defined parameters (LF-HF) can define the active phase and sleep phase in patients with lung cancer who undergo chemotherapy or targeted chemotherapy, allowing a deduction of their sleep patterns.
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Affiliation(s)
- Chi-Huang Shih
- Department of Computer Science and Information Engineering, National Chin-Yi University of Technology, Taichung, Taiwan
| | - Pai-Chien Chou
- Division of Thoracic Medicine, Department of Internal Medicine, Taipei Medical University Hospital, Taipei, Taiwan
- Division of Thoracic Medicine, Department of Internal Medicine, School of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Ting-Ling Chou
- School of Nursing, College of Nursing, Taipei Medical University, Taipei City, Taiwan
| | - Tsai-Wei Huang
- School of Nursing, College of Nursing, Taipei Medical University, Taipei City, Taiwan
- Cochrane Taiwan, Taipei Medical University, Taipei, Taiwan
- Center for Nursing and Healthcare Research in Clinical Practice Application, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
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Lederer AM, Fredriksen PM, Nkeh-Chungag BN, Everson F, Strijdom H, De Boever P, Goswami N. Cardiovascular effects of air pollution: current evidence from animal and human studies. Am J Physiol Heart Circ Physiol 2021; 320:H1417-H1439. [PMID: 33513082 DOI: 10.1152/ajpheart.00706.2020] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Air pollution is a global health concern. Particulate matter (PM)2.5, a component of ambient air pollution, has been identified by the World Health Organization as one of the pollutants that poses the greatest threat to public health. Cardiovascular health effects have been extensively documented, and these effects are still being researched to provide an overview of recent literature regarding air pollution-associated cardiovascular morbidity and mortality in humans. Additionally, potential mechanisms through which air pollutants affect the cardiovascular system are discussed based on human and additional animal studies. We used the strategy of a narrative review to summarize the scientific literature of studies that were published in the past 7 yr. Searches were carried out on PubMed and Web of Science using predefined search queries. We obtained an initial set of 800 publications that were filtered to 78 publications that were relevant to include in this review. Analysis of the literature showed significant associations between air pollution, especially PM2.5, and the risk of elevated blood pressure (BP), acute coronary syndrome, myocardial infarction (MI), cardiac arrhythmia, and heart failure (HF). Prominent mechanisms that underlie the adverse effects of air pollution include oxidative stress, systemic inflammation, endothelial dysfunction, autonomic imbalance, and thrombogenicity. The current review underscores the relevance of air pollution as a global health concern that affects cardiovascular health. More rigorous standards are needed to reduce the cardiovascular disease burden imposed by air pollution. Continued research on the health impact of air pollution is needed to provide further insight.
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Affiliation(s)
- Agnes Maria Lederer
- Physiology Division, Otto Loewi Research Centre, Medical University of Graz, Graz, Austria
| | | | - Benedicta Ngwenchi Nkeh-Chungag
- Department of Biological and Environmental Sciences, Faculty of Natural Sciences, Walter Sisulu University, Mthatha, South Africa
| | - Frans Everson
- Centre for Cardio-metabolic Research in Africa, Division of Medical Physiology, Stellenbosch University, Stellenbosch, South Africa
| | - Hans Strijdom
- Centre for Cardio-metabolic Research in Africa, Division of Medical Physiology, Stellenbosch University, Stellenbosch, South Africa
| | - Patrick De Boever
- Department of Biology, University of Antwerp, Wilrijk, Belgium.,Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Nandu Goswami
- Physiology Division, Otto Loewi Research Centre, Medical University of Graz, Graz, Austria.,Department of Health Sciences, Alma Mater Europaea Maribor, Maribor, Slovenia
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Goswami N, Abulafia C, Vigo D, Moser M, Cornelissen G, Cardinali D. Falls Risk, Circadian Rhythms and Melatonin: Current Perspectives. Clin Interv Aging 2020; 15:2165-2174. [PMID: 33204081 PMCID: PMC7666981 DOI: 10.2147/cia.s283342] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 11/03/2020] [Indexed: 01/31/2023] Open
Abstract
Aging is associated with weakening of the circadian system. The circadian amplitude of most physiological variables is reduced, while the circadian phase becomes more labile and tends to occur earlier with advancing age. As the incidence of falls in older persons could follow circadian variations, a better understanding of conditions in which falls occur can lead to the implementation of countermeasures (such as adjusting the scheduling of hospital staff, or changing the timing of anti-hypertensive medication if falls are related to undesirable circadian patterns of blood pressure and/or heart rate). This includes knowing the times of the day, days of the week, and times of the year when falls are more likely to occur at home or in the hospital. Additionally, the links between aging processes and factors associated with an increased risk of developing autonomic dysfunction are well established. A strong association between heart rate variability indexes and aging has been shown. Circadian rhythms of autonomous nervous system activity may play important role for maintenance of orthostatic tolerance. Whether one is concerned with disease prediction and prevention or maintenance of healthy aging, the study of circadian rhythms and the broader time structure underlying physiopathology is helpful in terms of screening, early diagnosis and prognosis, as well as the timely institution of prophylactic and/or palliative/curative treatment. Timing the administration of such treatment as a function of circadian (and other) rhythms also could lead to reduction of falls in older persons. Finally, a prominent circadian rhythm characterizes melatonin, which peaks during the night. The circadian amplitude of melatonin decreases as a function of age, raising the questions whether such a decrease in the circadian amplitude of melatonin relates to a higher risk of falls and, if so, whether melatonin supplementation may be an effective countermeasure. This narrative review assesses the relationships between fall risk and the potential role circadian rhythms and melatonin play in mitigating this risk. We aim to provide healthcare workers adequate information about fall risk in older persons, including the potential role of the circadian rhythms and/or melatonin, as well as to lay foundations for future fall prevention interventional studies.
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Affiliation(s)
- Nandu Goswami
- Physiology Division, Otto Loewi Research Center for Vascular Biology, Immunology and Inflammation, Medical University of Graz, Graz, Austria
| | - Carolina Abulafia
- Institute for Biomedical Research (BIOMED), Catholic University of Argentina (UCA) and National Scientific and Technical Research Council (CONICET), Autonomous City of Buenos Aires, Argentina
| | - Daniel Vigo
- Institute for Biomedical Research (BIOMED), Catholic University of Argentina (UCA) and National Scientific and Technical Research Council (CONICET), Autonomous City of Buenos Aires, Argentina
| | - Maximilian Moser
- Physiology Division, Otto Loewi Research Center for Vascular Biology, Immunology and Inflammation, Medical University of Graz, Graz, Austria
| | | | - Daniel Cardinali
- Institute for Biomedical Research (BIOMED), Catholic University of Argentina (UCA) and National Scientific and Technical Research Council (CONICET), Autonomous City of Buenos Aires, Argentina
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Buratti L, Cruciani C, Pulcini A, Rocchi C, Totaro V, Lattanzi S, Viticchi G, Falsetti L, Silvestrini M. Lacunar stroke and heart rate variability during sleep. Sleep Med 2020; 73:23-28. [PMID: 32769029 DOI: 10.1016/j.sleep.2020.04.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 04/06/2020] [Accepted: 04/07/2020] [Indexed: 12/28/2022]
Abstract
OBJECTIVE Autonomic instability during sleep can influence the risk of cerebrovascular diseases. In this study, we performed a polygraphy to evaluate, heart rate variability (HRV) in a group of patients with lacunar stroke that is a condition at high risk of recurrence. METHODS Twenty-one lacunar stroke patients were enrolled one month after stroke occurrence. Sleep quality was assessed with the Pittsburgh Sleep Quality Index (PSQI). The presence of common sleep disorders and autonomic changes during the night was investigated by a polygraphy monitoring. Results were compared with those obtained in a group of 21 healthy subjects. RESULTS Patients and controls were similar for age, sex distribution and main cardiovascular risk factors with the exception of the body mass index. Significant differences were detected for all polysomnographic (PSG) parameters and for the PSQI score. By considering HRV values, patients with pathologic values (12 patients, HRV>2) showed significantly higher values in BMI (31 ± 2.9 vs. 26.6 ± 3.6, p = 0.006) and PSQI scores (7.9 ± 2.6 vs. 4.2 ± 1.9) with respect to patients with normal HRV values (nine patients, HRV≤2). CONCLUSIONS The results of this study suggest that the prevalence of nocturnal autonomic dysfunction is high in lacunar stroke patients even in the absence of the commonest sleep-related disorders. An abnormal HRV may contribute to increase the risk of stroke recurrence. Based on our results, the indication to polygraphy in patients with lacunar stroke should be carefully considered.
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Affiliation(s)
- Laura Buratti
- Neurological Clinic, Marche Polytechnic University, Via Conca 71, 60020, Ancona, Italy.
| | - Crizia Cruciani
- Neurological Clinic, Marche Polytechnic University, Via Conca 71, 60020, Ancona, Italy
| | - Alessandra Pulcini
- Neurological Clinic, Marche Polytechnic University, Via Conca 71, 60020, Ancona, Italy
| | - Chiara Rocchi
- Neurological Clinic, Marche Polytechnic University, Via Conca 71, 60020, Ancona, Italy
| | - Viviana Totaro
- Neurological Clinic, Marche Polytechnic University, Via Conca 71, 60020, Ancona, Italy
| | - Simona Lattanzi
- Neurological Clinic, Marche Polytechnic University, Via Conca 71, 60020, Ancona, Italy
| | - Giovanna Viticchi
- Neurological Clinic, Marche Polytechnic University, Via Conca 71, 60020, Ancona, Italy
| | - Lorenzo Falsetti
- Internal and Subintensive Medicine, Ospedali Riuniti, Via Conca 71, 60020, Ancona, Italy
| | - Mauro Silvestrini
- Neurological Clinic, Marche Polytechnic University, Via Conca 71, 60020, Ancona, Italy
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