scholarly journals Identification of heart rate dynamics during moderate-to-vigorous treadmill exercise

2015 ◽  
Vol 14 (1) ◽  
Author(s):  
Kenneth J. Hunt ◽  
Simon E. Fankhauser ◽  
Jittima Saengsuwan
Keyword(s):  
Heart Rate ◽  
Treadmill Exercise ◽  
Heart Rate Dynamics

scholarly journals Identification and comparison of heart-rate dynamics during cycle ergometer and treadmill exercise

PLoS ONE ◽  
2019 ◽  
Vol 14 (8) ◽  
pp. e0220826 ◽  
Author(s):  
Kenneth J. Hunt ◽  
Reto Grunder ◽  
Andreas Zahnd
Keyword(s):  
Heart Rate ◽  
Treadmill Exercise ◽  
Cycle Ergometer ◽  
Heart Rate Dynamics

Assessment of Nonlinear Heart Rate Dynamics after Beating-Heart Revascularization

2009 ◽  
Vol 12 (1) ◽  
pp. E10-E16 ◽  
Author(s):  
Jus Ksela ◽  
Piotr Suwalski ◽  
Jurij Matija Kalisnik ◽  
Viktor Avbelj ◽  
Grzegorz Suwalski ◽  
...  
Keyword(s):  
Heart Rate ◽  
Beating Heart ◽  
Nonlinear Heart Rate Dynamics ◽  
Heart Rate Dynamics

Heart Rate Dynamics After Acute Cocaine Administration

1992 ◽  
Vol 19 (3) ◽  
pp. 453-459 ◽  
Author(s):  
Alan Garfinkel ◽  
Sheryl L. Raetz ◽  
Ronald M. Harper
Keyword(s):  
Heart Rate ◽  
Cocaine Administration ◽  
Heart Rate Dynamics

scholarly journals PR interval as a predictor of syncope in tilt-up testing in adolescents and young adults

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Juraj Jug ◽  
Lada Bradić ◽  
Rea Levicki ◽  
Martina Lovrić Benčić
Keyword(s):  
Heart Rate ◽  
Vasovagal Syncope ◽  
True Positive ◽  
Ecg Monitoring ◽  
Interval Prolongation ◽  
Patient History ◽  
Pr Interval ◽  
Heart Rate Dynamics ◽  
Testing Data ◽  
Consciousness Disorder

Abstract Background Syncope, as the most frequent consciousness disorder, is very common in young individuals. The aim of this study was to analyze ECG parameters and clinical properties obtained during tilt-up testing in 12 to 30-year-old subjects. We enrolled a total of 142 patients from our outpatient clinic (39 males, 103 females) with a true positive tilt-up test and analyzed ECG records obtained during tilt-testing. Data were stratified according to the age, gender, and type of syncope. Results PR interval shortening preceding syncope was found in all syncope types, irrespective of the gender. All types of syncope were more frequent in women (72.5%). Mixed syncope type was found to be the most common (47.18%). Male and female subjects differed in initial heart rate (71.56 vs 76.23/min, p=0.05), as well as heart rate dynamics during tilt-up testing. A gender difference was also found in systolic blood pressure (116.92 vs 110.44 mmHg, p<0.01), time to syncope onset (20.77 vs. 16.44 min, p=0.03), and the total number of syncopal episodes in patient history (2.79 vs. 4.62, p<0.05). Subjects with cardioinhibitory syncope had the longest PR interval (average 154.3 ms). PR interval prolongation and loss of variability during tilt-up testing positively correlated with aging (r=0.22, p<0.05). Nodal rhythm was found in 8 patients. Conclusion PR interval shortening on ECG tracings during a tilt-up test can be found in all subtypes of vasovagal syncope, thereby contrasting previous reports that these changes are a hallmark of the cardioinhibitory type of syncope. PR shortening, if observed during ECG monitoring, could be a potential predictor of syncope.

Nonlinear analysis of heart rate dynamics in hyperthyroidism

2007 ◽  
Vol 28 (4) ◽  
pp. 427-437 ◽  
Author(s):  
Jin-Long Chen ◽  
Yin-Jiun Tseng ◽  
Hung-Wen Chiu ◽  
Tzu-Chien Hsiao ◽  
Woei-Chyn Chu
Keyword(s):  
Heart Rate ◽  
Nonlinear Analysis ◽  
Heart Rate Dynamics

Complex and irregular heart rate dynamics in fetuses compromised by maternal anemia as a high-risk pregnancy

2015 ◽  
Vol 43 (6) ◽  
Author(s):  
Young-Sun Park ◽  
Jeong-Kyu Hoh
Keyword(s):  
Heart Rate ◽  
High Risk ◽  
Approximate Entropy ◽  
Risk Groups ◽  
Adverse Outcomes ◽  
Maternal Anemia ◽  
Risk Pregnancy ◽  
Heart Rate Dynamics ◽  
Study Population ◽  
Normal Controls

AbstractTo examine how complex and irregular fetal heart rate (FHR) dynamics differ between fetuses of normal pregnancies and those of pregnancies complicated by maternal anemia (MA), and to place this in the context of high-risk pregnancies.Our study population consisted of 97 pregnant women affected by MA, 118 affected by pregnancy-induced hypertension (PIH), 88 affected by gestational diabetes mellitus (GDM), 53 with preterm premature rupture of membranes (pPROM), and 356 normal pregnancies as controls. We calculated approximate entropy (ApEn), sample entropy (SampEn), and correlation dimension (CD) to quantify irregularity and the chaotic dynamics of each FHR time series.The ApEn in the fetuses of the MA and PIH groups was significantly lower than that of the normal controls (P<0.05). The SampEn was significantly lower in the high-risk groups, except for the pPROM group, than in the normal controls (P<0.05). The CD in the PIH and severe MA groups was significantly lower than that of the normal controls (P<0.05, respectively). In the MA group, the dynamic indices showed a highly significant positive correlation with hemoglobin (Hb) levels (P<0.0001).The decreased complexity and/or irregularity in the FHR from pregnancies with MA may reflect abnormalities in the complex, integrated cardiovascular control. The irregularity and complexity of the FHR increased together with Hb levels in pregnancies with MA. Our data suggest that the integrity of the nervous system in the fetuses compromised by severe MA might result directly in adverse outcomes.

scholarly journals Optimal control of heart rate during treadmill exercise

2017 ◽  
Vol 39 (2) ◽  
pp. 503-518 ◽  
Author(s):  
Kenneth J. Hunt ◽  
Ming Liu
Keyword(s):  
Heart Rate ◽  
Optimal Control ◽  
Treadmill Exercise

Chaotic Heart Rate Dynamics in Isolated Perfused Rat Hearts

1989 ◽  
pp. 215-224 ◽  
Author(s):  
Joseph P. Zbilut ◽  
Gottfried Mayer-Kress ◽  
Paul A. Sobotka ◽  
Michael O’Toole ◽  
John X. Thomas
Keyword(s):  
Heart Rate ◽  
Rat Hearts ◽  
Heart Rate Dynamics ◽  
Perfused Rat Hearts ◽  
Isolated Perfused Rat Hearts

scholarly journals ECG Ambulatory System for Long Term Monitoring of Heart Rate Dynamics

10.5772/20946 ◽  
2011 ◽  
Author(s):  
Agustin Marquez-Espinoza ◽  
Jose G. ◽  
Gabriel Vega-Martinez ◽  
Carlos Alvarado-Serrano
Keyword(s):  
Heart Rate ◽  
Heart Rate Dynamics ◽  
Long Term Monitoring ◽  
Term Monitoring
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