Association of heart rate variability with preoperative acute insomnia in patients scheduled for elective surgery by Zhenqiao Zhao, Junchao Liang, Shujie Hou, Guojia Zhu, Ning Liu, Wei Hao, Zhijuan Xu

“…ObjectiveHeart rate variability (HRV), which reflects the balance of the sympathetic and parasympathetic systems, is associated with insomnia. …”
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Heart rate variability and blood pressure during and after three CrossFit® sessions by Ana Cristina Barreto, Adalberto P Medeiros, Gleisson da Silva Araujo, Rodrigo Vale, Jeferson M Vianna, Rodolfo Alkimin, Rhodes Serra, Luis Leitão, Victor M Reis, Jefferson da Silva Novaes

“… CrossFit® is a training program characterized by high intensity stimulus with constantly varied and multifunctional movements that induces a significant range of physiological, hemodynamic and biochemical responses. Heart rate variability (HRV) can be used to measure how individuals react to physiological stress and fatigue. …”
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The usefulness of heart rate variability in adolescents with tic disorder: Focused on interplay with quality of life. by Young Eun Mok, SuHyuk Chi, June Kang, Jeong-An Gim, Jeong-Kyung Ko, Moon-Soo Lee

“…This study investigates the relationship between tic disorders and heart rate variability (HRV), a physiological marker of autonomic nervous system function. …”
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ASSOCIATION BETWEEN HEART RATE VARIABILITY AND COMPONENTS OF THE METABOLIC SYNDROME IN WOMEN WITH RHEUMATOID ARTHRITIS by D. S. Novikova, T. V. Popkova, A. N. Gerasimov, A. V. Volkov, E. L. Nasonov

“…To study the relationship between heart rate variability (HRV) and components of the metabolic syndrome (MS) in women with rheumatoid arthritis (RA).Material and methods. …”
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An emotional distress biomarker in pregnant women: Ultra-short-term heart rate variability by Weiyi Xie, Man Wang, Hui Yun Li, Pingqiao Wang, Clifton Robert Emery, Siuman Ng

“…Altered emotional distress can occur from the very beginning to the end of pregnancy. Heart rate variability (HRV) has recently become considered to be a potentially reliable psychophysiological stress biomarker in adults. …”
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Comparison of Heart Rate Variability in Thai Older Adults with Hypertension, Pre-Hypertension, and Normotension by Ruchada Sri-Amad, Nawiya Huipao, Porraporn Sriwannawit, Piyapong Prasertsri, Thapanee Roengrit

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Determination of heart rate variability as an indicator of the influence of the tone of the autonomic nervous system in goats by B. I. Boychuk, V. I. Karpovskyi, I. A. Hryshchuk, V. A. Tomchuk, A. V. Hryshchuk, B. V. Gutyj, V. V. Karpovskyi

“…Determination of heart rate variability can become one of the indispensable indicators in the analysis of animal health on dairy farms. …”
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Effect of caffeine on heart rate variability parameters in female rats with doxorubicin-induced cardiomyopathy by V. V. Mukvych, O. V. Severynovska

“…One of the modern, non-invasive, and informative methods for assessing the functional state of the cardiovascular system is heart rate variability (HRV) analysis. In the context of searching for means to correct doxorubicin-induced cardiomyopathy, there is growing interest in studying the effects of natural compounds with potential cardioprotective properties. …”
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Intensive Care Unit Nursing Stress: Measuring Heart Rate Variability and Workplace Trauma by Levi P, Li P, Nicholson WC, Heaton K, Fazeli PL, Watts PI, Moss J

“…New nurses tended to have lower HRV than experienced nurses. We found high rates of perceived stress and peritraumatic dissociative experiences and low resilience in the ICU nurses.Conclusion: HRV can be used as a contemporary index of workplace stress and trauma in ICU nurses. …”
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Relationship between state anxiety, heart rate variability, and shooting performance in adolescent shooters by Chaochao Zhao, Kun Wang, Dan Li, Yan Li, Zhuo Wang, Yongsen Liu, Tingran Zhang

“…Abstract Objective By comparing the differences in pre-competition state anxiety, inter-competition heart rate variability (HRV), and shooting performance of young athletes of different grades, and revealing the correlation between these variables, it provides a potential basis for improving athletes’ shooting performance. …”
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Autonomic function classification and sleep quality among young adults in Central Java, Indonesia: A cluster analysis by Vivi Leona Amelia, Chia-Hui Wang, Nurina Jihan Yulianti, Jebul Suroso, Min-Huey Chung

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Clustering of cantons in Costa Rica based on interest variables during the beta variant of Covid-19 by Isaí Ugalde-Araya

“…In this study, a cluster analysis was conducted based on the variables of mortality rate, morbidity rate, and fatality rate, along with cantonal geographical density, for the period of the beta variant in Costa Rica, corresponding to the months from February to June 2021. …”
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Synchronicity analysis of meteorological variables on agricultural drought in the Loess Plateau, China by Fang Liu, Hongbo Zhang, Yihang Li, Zhiyuan Ning, Shuai Hao

“…The precursor coincidence rate is higher than the trigger coincidence rate, suggesting that not all precursory SIMV events cause agricultural drought. …”
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INFLUENCE OF ALPHAEEG/EMG BIOFEEDBACK AND SELF-REGULATION PSYCHO TECHNIQUES ON THE HEART RATE VARIABILITY INDICES by O. M. Bazanova, D. Vernon, K. B. Muravlyova, M. V. Skoraya

“…With the purpose to study the impact of the upper frequency alpha EEG power increasing neurofeedback training (ANFT) on the cognitive performance, EEG alpha-activity and heart rate variability (HRV) 27 healthy men aged 18–34 years in pre, post and follow up one month 10 sessions ANFT time were investigated. …”
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Heart Rate Variability during Nostril-Regulated Yoga Breathing: A Randomized Crossover Study by Shirley Telles, Alok Singh, Sachin Kumar Sharma, Acharya Balkrishna

“…Methods: Forty-seven healthy male participants (group mean age ± standard deviation [SD]; 26.34 ± 6.38 years) with prior experience of yoga breathing (group mean age ± SD; 43.64 ± 32.84 months) were randomly assigned to four sessions on separate days: (i) SBP, (ii) CBP, (iii) Breath awareness, and (iv) Quiet rest. The heart rate variability (HRV) and breath rate were recorded pre, during, and post each practice. …”
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Does heart rate variability predict and improve performance in pediatric CPR?—a simulation study by Yosef Kula, Oren Wacht, Izhar Ben Shlomo, Asaf Gitler, Yori Gidron

“…Abstract Introduction Out-of-hospital pediatric resuscitation is a severe medical condition with a low survival rate. Providing pediatric resuscitation is a significant stressor for medical teams that may impair performance. …”
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Seasonal variations in the mental state and heart rate variability in adolescents residing beyond the Arctic Circle by Natalia K. Belisheva, Alla A. Martynova, Sergei N. Kolomeichuk

“…However, the interplay of mental state and heart rate variability within the context of seasonal photoperiodicity in both PTS and SAD remains poorly understood. …”
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Heart rate variability in type 2 diabetes mellitus: A systematic review and meta-analysis. by Thomas Benichou, Bruno Pereira, Martial Mermillod, Igor Tauveron, Daniela Pfabigan, Salwan Maqdasy, Frédéric Dutheil

“…<h4>Background</h4>Cardiac autonomic neuropathy in type 2 dibetes mellitus (T2DM) patients is frequent and associated with high cardiovascular mortality. Heart rate variability (HRV) is the gold standard to measure cardiac autonomic neuropathy. …”
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Neonatal heart rate variability: a contemporary scoping review of analysis methods and clinical applications by Wissam Shalish, Samantha Latremouille, Justin Lam, Guilherme Sant'Anna

“…Background Neonatal heart rate variability (HRV) is widely used as a research tool. …”
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Impact of aging on cardiovascular dynamics and heart rate variability during passive head‐up tilt by Manoj Kumar Choudhary, Kati Holmström, Heidi Bouquin, Tuomas P. Saarinen, Jenni K. Koskela, Essi Pietilä, Lauri Suojanen, Jukka T. Mustonen, Pasi I. Nevalainen, Ilkka H. Pörsti

“…Abstract During aging, arterial stiffness and blood pressure (BP) increase, while heart rate variability (HRV) decreases. We examined age‐related hemodynamics in 522 individuals without cardiovascular disease during passive head‐up tilt (HUT) using pulse wave analysis, whole‐body impedance cardiography, and HRV analysis. …”
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