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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Science: general issues --- Neurosciences --- heart rate variability --- arterial blood pressure --- sympathetic neural activity --- cardiovascular control --- peripheral resistances --- autonomic nervous system --- baroreflex sensitivity

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In this book, the emphasis is on various training interventions. Types of exercises that can help improve performance in athletes and health in people facing poor movement diseases.Also, we have presented a variety of strength training interventions in the form of various types of research. On the other hand, we continue to monitor internal and external loads related to non-contact injuries and performance analysis.

Humanities --- Social interaction --- COVID-19 --- immune response --- chronic diseases --- exercise --- oxidative stress --- anti-inflammatory treatment --- fibroblast growth factor 21 --- cytokines --- myokines --- anabolic–androgenic steroids --- athletes --- baroreflex sensitivity --- cardiac autonomic nervous system --- cardiac function --- physical guidance --- tracking task --- cerebral palsy --- challenge point framework --- frequency --- virtual driving --- physical activity --- behavioral status --- mental state --- older men --- reaction time --- visual coordination --- visual reaction --- female --- football --- autonomic modulation --- fatigue --- training load --- altitude --- haemoglobin --- erythropoietin --- hypoxia --- endurance --- sand --- occupational health --- tactical athlete --- landing error scoring system --- reactive strength index --- tactical personnel --- force plates --- military --- law enforcement --- neuromuscular fatigue --- spinal curvature --- Paralympic volleyball --- compensation strategy --- thoracic hyperkyphosis --- adapted training --- low back pain --- kidney failure --- AKI --- health --- biomarkers --- strenuous exercise --- mountain running --- kidney function --- off-road running --- performance --- kinematics --- laser --- computer vision --- inertial device --- IMU --- injury risk --- high load --- external monitoring --- high-speed distance --- global positioning system --- movement analysis --- handball shot --- internal load --- shot precision --- motor decisions-making --- GPS --- T-Patterns --- acceleration --- motor praxeology --- role --- anatomy --- spine --- thoracic spine --- low back --- lumbar spine --- biomechanics --- rowing --- antioxidant status --- nutrition --- reactive oxygen species (ROS) --- biomechanical analysis --- pressure insoles --- Xsens motion capture system --- performance analysis --- recreational skiers --- dry-land training --- GEE modeling --- oxygen consumption --- strength training --- surface electromyography --- bone mineral --- skeletomuscular robusticity --- elite athletes --- DEXA --- executive functions --- shooting performance --- gender differences --- cadets --- resistance training --- power exercise --- team sport --- conditioning capabilities --- lower extremity --- dynamic balance --- dose–response --- training intensity --- elastic bands --- chain --- eccentric training --- decline squat --- patellar tendon --- sonoelastography --- stiffness

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Complexity is a ubiquitous phenomenon in physiology that allows living systems to adapt to external perturbations. Fractal structures, self-organization, nonlinearity, interactions at different scales, and interconnections among systems through anatomical and functional networks, may originate complexity. Biomedical signals from physiological systems may carry information about the system complexity useful to identify physiological states, monitor health, and predict pathological events. Therefore, complexity analysis of biomedical signals is a rapidly evolving field aimed at extracting information on the physiological systems. This book consists of 16 contributions from authors with a strong scientific background in biomedical signals analysis. It includes reviews on the state-of-the-art of complexity studies in specific medical applications, new methods to improve complexity quantifiers, and novel complexity analyses in physiological or clinical scenarios. It presents a wide spectrum of methods investigating the entropic properties, multifractal structure, self-organized criticality, and information dynamics of biomedical signals touching upon three physiological areas: the cardiovascular system, the central nervous system, the heart-brain interactions. The book is aimed at experienced researchers in signal analysis and presents the latest trends in the complexity methods in physiology and medicine with the hope of inspiring future works advancing this fascinating area of research.

Research & information: general --- Mathematics & science --- autonomic nervous function --- heart rate variability (HRV) --- baroreflex sensitivity (BRS) --- photo-plethysmo-graphy (PPG) --- digital volume pulse (DVP) --- percussion entropy index (PEI) --- heart rate variability --- posture --- entropy --- complexity --- cognitive task --- sample entropy --- brain functional networks --- dynamic functional connectivity --- static functional connectivity --- K-means clustering algorithm --- fragmentation --- aging in human population --- factor analysis --- support vector machines classification --- Sampen --- cross-entropy --- autonomic nervous system --- heart rate --- blood pressure --- hypobaric hypoxia --- rehabilitation medicine --- labor --- fetal heart rate --- data compression --- complexity analysis --- nonlinear analysis --- preterm --- Alzheimer’s disease --- brain signals --- single-channel analysis --- biomarker --- refined composite multiscale entropy --- central autonomic network --- interconnectivity --- ECG --- ectopic beat --- baroreflex --- self-organized criticality --- vasovagal syncope --- Zipf’s law --- multifractality --- multiscale complexity --- detrended fluctuation analysis --- self-similarity --- sEMG --- approximate entropy --- fuzzy entropy --- fractal dimension --- recurrence quantification analysis --- correlation dimension --- largest Lyapunov exponent --- time series analysis --- relative consistency --- event-related de/synchronization --- motor imagery --- vector quantization --- information dynamics --- partial information decomposition --- conditional transfer entropy --- network physiology --- multivariate time series analysis --- State–space models --- vector autoregressive model --- penalized regression techniques --- linear prediction --- fNIRS --- brain dynamics --- mental arithmetics --- multiscale --- cardiovascular system --- brain --- information flow