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Agletdinov EA, Yasnikov IS. Application of recurrence quantification analysis of acoustic emission time series to analysis of a plastic flow of metals. Phys Rev E 2023; 108:044217. [PMID: 37978713 DOI: 10.1103/physreve.108.044217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 10/02/2023] [Indexed: 11/19/2023]
Abstract
As a result of the application of recurrence quantification analysis to acoustic emission time series obtained in uniaxial tensile testing of copper and silver, we detected the existence of a characteristic interval in which the Shannon information entropy (as a parameter of the quantitative analysis of recurrence plots) increased rapidly. Using statistical analysis of the behavior of the dislocation ensemble, we established a relation between the physical parameters of the given interval and the global stability loss parameters of the plastic flow of metals, indicating the predictability of the distinctive point determined long before the critical state was attained.
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Affiliation(s)
- Einar A Agletdinov
- Research Institute for Advanced Technologies, Togliatti State University, Togliatti 445020, Russia
| | - Igor S Yasnikov
- Research Institute for Advanced Technologies, Togliatti State University, Togliatti 445020, Russia
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Demir I, Aydin S, Cengiz DU. The short-term effect of COVID-19 on the cochleovestibular system in pediatric patients. Int J Pediatr Otorhinolaryngol 2023; 164:111406. [PMID: 36521194 PMCID: PMC9737457 DOI: 10.1016/j.ijporl.2022.111406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 11/14/2022] [Accepted: 12/08/2022] [Indexed: 12/14/2022]
Abstract
OBJECTIVES The audio-vestibular equivalent of neurological symptoms secondary to severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) has been discussed; however, it has not been fully clarified. Although it has been reported that the vestibulocochlear system is affected in adult coronavirus disease-2019 (COVID-19) patients, there is no study in the literature in which the pediatric patient group with COVID-19 was evaluated comprehensively with auditory and vestibular tests. In this study, the short-term damage caused by SARS-CoV-2 in the vestibulocochlear system in pediatric patients was examined. METHODS This study aimed to evaluate the vestibulocochlear system of pediatric patients (aged 9-15 years) with a recent history of COVID-19. The study included 35 individuals with a recent history of COVID-19 and 35 age-gender-matched healthy individuals (control group). Pure tone audiometry, suppressed otoacoustic emission (OAE), video head impulse test (VHIT), and cervical and ocular vestibular evoked myogenic potentials (c/o-VEMP) tests were administered to all participants following their otoscopic examinations, and the obtained data were compared between the two groups. RESULTS When the data obtained with pure tone audiometry were compared, statistically significant differences were found between the groups at four different frequencies (1000, 2000, 4000, and 8000 Hz) in favor of the control group. There was a statistically significant difference between the groups in the signal-to-noise ratio (SNR) values obtained before noise at 2800 Hz and before and after noise at 4000 Hz. VHIT lateral gain, LARP gain, and RALP gain were statistically significantly lower in the COVID-19 group than in the control group (p < 0.05). VHIT lateral asymmetry parameter was measured higher in the COVID-19 group than in the control group, and this difference was statistically significant (p < 0.05). In the VHIT test, the asymmetry parameter was significantly higher in the COVID-19 group (p < 0.05). In the o-VEMP test, n10 latency, p15 latency, n10-p15 interlatency, n10-p15 interpeak amplitude, and asymmetry parameters were measured, and no statistically significant difference was found between the COVID-19 group and the control group (p > 0.05). CONCLUSION Evidence was obtained that the cochleovestibular system was damaged in pediatric patients in the early post-COVID-19 period.
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Affiliation(s)
- Ismail Demir
- , Department of Audiology, Inonu University Faculty of Health Sciences, Malatya, Turkey.
| | - Sukru Aydin
- , Department of Otolaryngology Head and Neck Surgery, Inonu University Faculty of Medicine, Malatya, Turkey.
| | - Deniz Ugur Cengiz
- , Department of Audiology, Inonu University Faculty of Health Sciences, Malatya, Turkey.
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Cardinali L, Curzi D, Maccarani E, Falcioni L, Campanella M, Ferrari D, Maulini C, Gallotta MC, Zimatore G, Baldari C, Guidetti L. Live Streaming vs. Pre-Recorded Training during the COVID-19 Pandemic in Italian Rhythmic Gymnastics. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:16441. [PMID: 36554324 PMCID: PMC9778436 DOI: 10.3390/ijerph192416441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 12/06/2022] [Accepted: 12/06/2022] [Indexed: 06/17/2023]
Abstract
The SARS-CoV-2 outbreak led to an inevitable and drastic transition to online training systems. This study aimed to analyze the differences between live-streaming and pre-recorded training modalities in rhythmic gymnastics (RG) with coaches and gymnasts of different technical levels. A total of 238 coaches and 277 athletes affiliated with the Italian Gymnastics Federation (FGI) participated in the study. The data collection tool was a self-collected questionnaire structured in three sections: participant's information, characteristics of live-streaming training, and characteristics of pre-recorded training. A 2 × 2 ANOVA was used for each numeric variable. A Pearson's chi-squared test was used for each categorical variable. For the athletes, training frequency, motivation, and efficacy were significantly higher (p < 0.05) with live streaming (3.7 ± 1.5 day/week, 3.8 ± 0.9 score and 3.8 ± 0.8 score, respectively) than with a pre-recorded modality (2.2 ± 1.7 day/week, 3.1 ± 1.2 score and 3.7 ± 0.9 score, respectively), while for coaches, significant differences (p < 0.005) were found between the two modalities only for training frequency (live streaming, 3.6 ± 1.8 days/week vs. pre-recorded, 2.1 ± 1.7 days/week). The adherence (number of No:Yes) was significantly higher (p < 0.05) for the live-streaming modality than for the pre-recorded modality in gold athletes (1:74 vs. 14:61, respectively), silver athletes (12:190 vs. 28:174, respectively), and gold coaches (3:63 vs. 11:55, respectively), but it was not for silver coaches. Physical preparation was performed significantly (p < 0.005) more often (number of No:Yes) for live streaming than for the pre-recorded modality by gold athletes (9:66 vs. 34:41, respectively), silver athletes (25:177 vs. 77:125, respectively), gold coaches (8:58 vs. 37:29), and silver coaches (33:139 vs. 85:87, respectively). Free body technical preparation was performed significantly (p < 0.005) more often (number of No:Yes) for live streaming than for the pre-recorded modality by gold athletes (15:60 vs. 39:36, respectively), silver athletes (84:118 vs. 121:81, respectively), gold coaches (10:56 vs. 38:28), and silver coaches (60:112 vs. 105:67, respectively), while no differences were found for silver athletes' and coaches' technical preparations for apparatus training between the two modalities. In conclusion, live streaming had greater positive effects on RG training during home confinement. However, pre-recorded training could be more effective for some types of training, depending on the technical level of the athletes.
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Affiliation(s)
- Ludovica Cardinali
- Department of Movement, Human and Health Sciences, University of Rome “Foro Italico”, 00135 Rome, Italy
| | - Davide Curzi
- Department Unicusano, University “Niccolò Cusano”, 00166 Rome, Italy
| | | | - Lavinia Falcioni
- Department of Movement, Human and Health Sciences, University of Rome “Foro Italico”, 00135 Rome, Italy
| | | | - Dafne Ferrari
- Faculty of Psychology, eCampus University, 22060 Novedrate, Italy
| | - Claudia Maulini
- Department of Movement Sciences and Wellbeing, University of Naples Parthenope, 80133 Napoli, Italy
| | - Maria Chiara Gallotta
- Department of Physiology and Pharmacology “Vittorio Erspamer”, Sapienza University of Rome, 00185 Rome, Italy
| | - Giovanna Zimatore
- Department of Theoretical and Applied Sciences, eCampus University, 22060 Novedrate, Italy
| | - Carlo Baldari
- Faculty of Psychology, eCampus University, 22060 Novedrate, Italy
| | - Laura Guidetti
- Department Unicusano, University “Niccolò Cusano”, 00166 Rome, Italy
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Zimatore G, Gallotta MC, Campanella M, Skarzynski PH, Maulucci G, Serantoni C, De Spirito M, Curzi D, Guidetti L, Baldari C, Hatzopoulos S. Detecting Metabolic Thresholds from Nonlinear Analysis of Heart Rate Time Series: A Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph191912719. [PMID: 36232025 PMCID: PMC9564658 DOI: 10.3390/ijerph191912719] [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: 09/19/2022] [Revised: 09/30/2022] [Accepted: 10/02/2022] [Indexed: 05/03/2023]
Abstract
Heart rate time series are widely used to characterize physiological states and athletic performance. Among the main indicators of metabolic and physiological states, the detection of metabolic thresholds is an important tool in establishing training protocols in both sport and clinical fields. This paper reviews the most common methods, applied to heart rate (HR) time series, aiming to detect metabolic thresholds. These methodologies have been largely used to assess energy metabolism and to identify the appropriate intensity of physical exercise which can reduce body weight and improve physical fitness. Specifically, we focused on the main nonlinear signal evaluation methods using HR to identify metabolic thresholds with the purpose of identifying a method which can represent a useful tool for the real-time settings of wearable devices in sport activities. While the advantages and disadvantages of each method, and the possible applications, are presented, this review confirms that the nonlinear analysis of HR time series represents a solid, robust and noninvasive approach to assess metabolic thresholds.
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Affiliation(s)
- Giovanna Zimatore
- Department of Theoretical and Applied Sciences, eCampus University, 22060 Novedrate, Italy
- IMM-CNR, 40129 Bologna, Italy
- Correspondence: (G.Z.); (G.M.)
| | - Maria Chiara Gallotta
- Department of Physiology and Pharmacology “Vittorio Erspamer”, Sapienza University of Rome, 00185 Roma, Italy
| | - Matteo Campanella
- Department of Theoretical and Applied Sciences, eCampus University, 22060 Novedrate, Italy
| | - Piotr H. Skarzynski
- Department of Teleaudiology and Screening, World Hearing Center, Institute of Physiology and Pathology of Hearing, 02-042 Warsaw, Poland
- Heart Failure and Cardiac Rehabilitation Department, Faculty of Medicine, Medical University of Warsaw, 03-042 Warsaw, Poland
- Institute of Sensory Organs, 05-830 Warsaw, Poland
| | - Giuseppe Maulucci
- Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy
- Neuroscience Department, Biophysics Section, Università Cattolica del Sacro Cuore, 00168 Rome, Italy
- Correspondence: (G.Z.); (G.M.)
| | - Cassandra Serantoni
- Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy
- Neuroscience Department, Biophysics Section, Università Cattolica del Sacro Cuore, 00168 Rome, Italy
| | - Marco De Spirito
- Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy
- Neuroscience Department, Biophysics Section, Università Cattolica del Sacro Cuore, 00168 Rome, Italy
| | - Davide Curzi
- Department Unicusano, Niccolò Cusano University, 00166 Rome, Italy
| | - Laura Guidetti
- Department Unicusano, Niccolò Cusano University, 00166 Rome, Italy
| | - Carlo Baldari
- Department of Theoretical and Applied Sciences, eCampus University, 22060 Novedrate, Italy
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Zimatore G, Cavagnaro M, Skarzynski PH, Hatzopoulos S. Detection of hearing losses (HL) via transient-evoked otoacoustic emissions: towards an automatic classification. Biomed Phys Eng Express 2022; 8. [PMID: 35724632 DOI: 10.1088/2057-1976/ac7a5e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Accepted: 06/20/2022] [Indexed: 11/11/2022]
Abstract
Transiently evoked otoacoustic emissions (TEOAEs) are routinely used in the hearing assessment of the auditory periphery. The major contribution of TEOAEs is the early detection of hearing losses in neonates, children, and adults. The evaluation of TEOAE responses by specific signal decomposition techniques offers numerous advantages for current and future research. One methodology, based on recurrence quantification analysis (RQA), can identify adult subjects presenting sensorineural hearing impairments. In two previous papers, the RQA-based approach was succesfully applied in identifying and classifying cases presenting noise and age related hearing losses. The current work investigates further two aspects of the previously proposed RQA-based analysis for hearing loss detection: (i) the reliability of a Training set built from different numbers of ears with normal hearing, and (ii) the threshold set of values of the key hearing loss detecting parameter RAD2D. Results: The Training set built from 158 healthy ears was found to be quite reliable and a similar but slightly minor performance was observed for the training set of 118 normal subjects, used in the past; the proposed ROC-curve method, optimizing the values of RAD2D, shows improved sensibility and specificity in one class discrimination. Conclusions: A complete and simplified procedure, based on the combined use of the traditional TEOAE reproducibility value and on values from the RQA-based RAD2D parameter, is proposed as an improved automatic classifier, in terms of sensitivity and specificity, for different types of hearing losses.
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Affiliation(s)
- Giovanna Zimatore
- Department of Theoretical and Applied Sciences Applied Physics, eCampus University, Via Isimbardi 10, Roma, Novedrate, 22060, ITALY
| | - Marta Cavagnaro
- Department of Information Engineering, Electronics and Telecommunications, University of Rome La Sapienza, via Eudossiana 18, Rome, Lazio, 00185, ITALY
| | - Piotr Henryk Skarzynski
- Department of Heart Failure and Cardiac Rehabilitation, Medical University of Warsaw, Żwirki i Wigury 61, Warszawa, Mazowieckie, 02-091, POLAND
| | - Stavros Hatzopoulos
- Clinic of Audiology & ENT, University of Ferrara, Via Aldo Moro 8, Ferrara, Ferrara, Emilia-Romagna, 44121, ITALY
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Unsupervised Clustering of Heartbeat Dynamics Allows for Real Time and Personalized Improvement in Cardiovascular Fitness. SENSORS 2022; 22:s22113974. [PMID: 35684596 PMCID: PMC9182749 DOI: 10.3390/s22113974] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/11/2022] [Accepted: 05/20/2022] [Indexed: 02/06/2023]
Abstract
VO2max index has a significant impact on overall health. Its estimation through wearables notifies the user of his level of fitness but cannot provide a detailed analysis of the time intervals in which heartbeat dynamics are changed and/or fatigue is emerging. Here, we developed a multiple modality biosignal processing method to investigate running sessions to characterize in real time heartbeat dynamics in response to external energy demand. We isolated dynamic regimes whose fraction increases with the VO2max and with the emergence of neuromuscular fatigue. This analysis can be extremely valuable by providing personalized feedback about the user’s fitness level improvement that can be realized by developing personalized exercise plans aimed to target a contextual increase in the dynamic regime fraction related to VO2max increase, at the expense of the dynamic regime fraction related to the emergence of fatigue. These strategies can ultimately result in the reduction in cardiovascular risk.
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Zimatore G, Falcioni L, Gallotta MC, Bonavolontà V, Campanella M, De Spirito M, Guidetti L, Baldari C. Recurrence quantification analysis of heart rate variability to detect both ventilatory thresholds. PLoS One 2021; 16:e0249504. [PMID: 34618821 PMCID: PMC8496840 DOI: 10.1371/journal.pone.0249504] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Accepted: 09/23/2021] [Indexed: 12/01/2022] Open
Abstract
Aims of this study were: to verify if Recurrence Quantification Analysis (RQA) of Heart Rate Variability (HRV) time series could determine both ventilatory thresholds in individuals with different fitness levels, and to assess the validity of RQA method compared to gas-exchange method (GE). The two thresholds were estimated in thirty young individuals during incremental exercise on cycle-ergometer: Heart rate (HR), Oxygen consumption (VO2) and Workload were measured by the two methods (RQA and GE). Repeated measures ANOVA was used to assess main effects of methods and methods-by-groups interaction effects for HR, VO2 and Workload at aerobic (AerT) and anaerobic (AnT) thresholds. Validity of RQA at both thresholds was assessed for HR, VO2 and Workload by Ordinary Least Products (OLP) regression, Typical Percentage Error (TE), Intraclass Correlation Coefficients (ICC) and the Bland Altman plots. No methods-by-groups interaction effects were detected for HR, VO2 and Workload at AerT and AnT. The OLP analysis showed that at both thresholds RQA and GE methods had very strong correlations (r >0.8) in all variables (HR, VO2 and Workload). Slope and intercept values always included the 1 and the 0, respectively. At AerT the TE ranged from 4.02% (5.48 bpm) to 10.47% (8.53 Watts) (HR and Workload, respectively) and in all variables ICC values were excellent (≥0.85). At AnT the TE ranged from 2.53% (3.98 bpm) to 6.64% (7.81 Watts) (HR and Workload, respectively) and in all variables ICC values were excellent (≥0.90). Therefore, RQA of HRV time series is a new valid approach to determine both ventilatory thresholds in individuals with different physical fitness levels, it can be used when gas analysis is not possible or not convenient.
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Affiliation(s)
- Giovanna Zimatore
- Department of Theoretical and Applied Sciences, eCampus University, Novedrate (CO), Italy
- IMM-CNR, Bologna, Italy
- * E-mail: ,
| | - Lavinia Falcioni
- Department of Movement, Human and Health Sciences, University of Rome “Foro Italico”, Rome, Italy
| | - Maria Chiara Gallotta
- Department of Physiology and Pharmacology "Vittorio Erspamer", Sapienza University of Rome, Rome, Italy
| | - Valerio Bonavolontà
- Department of Basic Medical Sciences, Neuroscience and Sense Organs, University “Aldo Moro”, Bari, Italy
| | - Matteo Campanella
- Department of Theoretical and Applied Sciences, eCampus University, Novedrate (CO), Italy
| | - Marco De Spirito
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore Rome, Rome, Italy
| | | | - Carlo Baldari
- Department of Theoretical and Applied Sciences, eCampus University, Novedrate (CO), Italy
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Evaluation of cochlear functions in infants exposed to SARS-CoV-2 intrauterine. Am J Otolaryngol 2021; 42:102982. [PMID: 33621767 PMCID: PMC7890354 DOI: 10.1016/j.amjoto.2021.102982] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 02/14/2021] [Indexed: 12/14/2022]
Abstract
Purpose The novel coronavirus (SARS-CoV-2) caused an acute respiratory illness named COVID-19 and the disease spread all over the World. Fever, cough, fatigue, gastrointestinal infection symptoms form the main clinical symptoms. Pregnants and newborns form a vulnerable population and urgent measures must be addressed. Studies about the effect of COVID-19 on pregnant women, developing fetuses, and infants are limited. Various viral diseases can cause congenital or acquired, unilateral or bilateral hearing loss. Methods 37 infants whose mother was pregnant between March 2020 and December 2020 and were born after the diagnosis of COVID- 19 during pregnancy and 36 healthy infants were included in the study. Transient evoked otoacoustic emission (TEOAE), distortion product otoacoustic emission (DPOAE) and contralateral suppression of OAE (CLS OAE) tests were performed on all infants. Results According to the TEOAE results of patients and controls in the silent a statistically significant difference was observed between the two groups at 3 kHz and 4 kHz (p < 0.05). Contralateral suppression of OAE test results of patients and controls a statistically significant difference was found in all frequencies (p< 0.05). Suppression was much more effective at all frequencies in the normal group than patient group. This difference was found to be more significant at higher frequencies (2,3 and 4 kHz) (p < 0.001). Conclusions Our results suggest an insufficiency in medial olivocochlear efferent system in infants exposed to SARS-CoV-2 intrauterine. Cochlear functions should be examined in infants whose mothers had COVID-19.
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