Ejection time — Heart rate relationship during exercise

Lance, Veronica Q.; Spodick, David H.

doi:10.1002/ccd.1810020208

Cited by 13 publications

(6 citation statements)

References 34 publications

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“…200–300 and 100–200 ms for the rest and the exercise conditions, respectively – can be associated with the ejection of blood from the left ventricle. By using data from previous literature (Cokkinos et al., 1976; Lance & Spodick, 1976; Mertens, et al, 1981) we estimated 1 that the ejection of blood from the left ventricle would have occurred from 107.16 to 358.58 ms and from 46.14 to 232.41 ms after the occurrence of the R‐wave, respectively for the rest and exercise conditions. These latencies include the bins described above and could represent the timing of the jerk generated by the contraction of the left ventricle.…”

Section: Discussionmentioning

confidence: 99%

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The influence of physical exercise on the relation between the phase of cardiac cycle and shooting accuracy in biathlon

Gallicchio

Finkenzeller

Sattlecker

et al. 2018

European Journal of Sport Science

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This study examined the influence of physical exercise on the relation between shooting accuracy and the phase of the cardiac cycle in which the shot is fired. Thirteen experienced biathletes (8 females, mean age 17 years) fired from the standing position at rest and right after a submaximal exercise on a bicycle ergometer. Shooting accuracy and the timing of each shot relative to the R-waves of the electrocardiogram (ECG) were recorded. Best shots (with greatest accuracy) and worst shots (with lowest accuracy) were fired prevalently in different phases of the cardiac cycle. In the rest condition, best shots were fired less frequently from 200 to 300 ms and more frequently from 500 to 600 ms after the R-wave, compared to worst shots. In the exercise condition, best shots were fired less frequently from 100 to 200 ms after the R-wave and from 20% to 30% of the R-R interval, compared to worst shots. These findings support the hypothesis that shooting accuracy is influenced by the cardiac cycle phase due to the ballistocardiac recoil generated at each heartbeat. To achieve best results athletes could be trained (e.g. through biofeedback) to fire within a specific phase of the cardiac cycle.

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Section: Discussionmentioning

confidence: 99%

“…in percentage). While the former can be interpreted in light of ballistocardiac phenomena known to happen at specific times after the R‐wave (Cokkinos et al., 1976; Lance & Spodick, 1976), the latter is susceptible to distortions consequent to changes in HR. For example, increases in HR (i.e.…”

Section: Introductionmentioning

confidence: 99%

The influence of physical exercise on the relation between the phase of cardiac cycle and shooting accuracy in biathlon

Gallicchio

Finkenzeller

Sattlecker

et al. 2018

European Journal of Sport Science

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“…Agress et al, (16) stated about the influence of different mode, position, and extent of exercise attributing to differences in the outcome in the STI parameters. Data from experiments of Lance et al, (17) and van der Hoeven et al, (18) showed that shortening of QS2 with Heart rate between 60 to 140 bpm had linear relationship that indicates that with the increase of heart rate the QS2 value decreased and vice versa. Hence exercise offers much valuable information about cardiovascular responses.…”

Section: Resultsmentioning

confidence: 97%

The effect of mild dynamic exercise on the electromechanical systole of heart in non-athlete, healthy first year medical students of Bengal as a predictive biomarker of arrhythmia

et al. 2022

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Introduction and Aim: Measurement of Systolic Time Intervals (STIs) is a non-invasive and convenient way of assessing left ventricular electro-mechanical activity. In this study, we assessed effect of mild dynamic exercise on QT, QS2, QT/QS2 ratio, QS2-Index among healthy young first year students at a government medical college of West Bengal, India and compared the same among girls and boys. Materials and Methods: IX-TA-220 multichannel recorder was used to record Electrocardiogram, Phonocardiogram and Carotid pulse tracing among 180 subjects before and after 1 minute of mild exercise with Harvard's Step of 30 cm height with metronome rhythm of 120 beats per minute. Results were analyzed by Microsoft Excel and comparison of each parameter between boys and girls were done using SPSS software in two hemodynamic states. P-value <0.05 was taken as statistically significant. Results: Post exercise mean QT and QS2 shortened and their ratio QT/QS2 increased. There was a statistically significant difference between pre-exercise and post-exercise mean QT, QT/QS2 ratio, QS2 index and significant differences were observed between mean values of the boys and girls. Conclusion: With hemodynamic changes as in exercise, due to sympathetic stimulation & catecholamine release, both QT andQS2 should reduce as all the phases of systole shorten but if QT does not reduce in comparison to QS2 it may lead to arrhythmia in future. Hence QT/QS2 can be a useful pro-arrhythmic biomarker and may complement ECG and Echocardiography in borderline cases.

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“…In contrast, IVCT (Fig 4E) and deceleration time (S1 Table) did not vary between sexes (p = 0.370 and p = 0.657, respectively) or dietary groups (p = 0.154 and p = 0.731, respectively). Ejection time in males was shorter in the Fiber compared to the Chow group (p = 0.001; Fig 4F), which could be explained, at least in part, by the inverse correlation between heart rate and ejection time [23, 24].…”

Section: Resultsmentioning

confidence: 99%

Cardiovascular sexual dimorphism in a diet-induced type 2 diabetes rodent model, the Nile rat (Arvicanthis niloticus)

et al. 2018

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BackgroundThe Nile rat (Arvicanthis niloticus) is an emerging laboratory model of type 2 diabetes. When fed standard rodent chow, the majority of males progress from hyperinsulinemia by 2 months to hyperglycemia by 6 months, while most females remain at the hyperinsulinemia-only stage (prediabetic) from 2 months onward. Since diabetic cardiomyopathy is the major cause of type-2 diabetes mellitus (T2DM)-related mortality, we examined whether sexual dimorphism might entail cardiac functional changes. Our ultimate goal was to isolate the effect of diet as a modifiable lifestyle factor.Materials and methodsNile rats were fed either standard rodent chow (Chow group) or a high-fiber diet previously established to prevent type 2 diabetes (Fiber group). Cardiac function was determined with echocardiography at 12 months of age. To isolate the effect of diet alone, only the small subset of animals resistant to both hyperinsulinemia and hyperglycemia were included in this study.ResultsIn males, Chow (compared to Fiber) was associated with elevated heart rate and mitral E/A velocity ratio, and with lower e’-wave velocity, isovolumetric relaxation time, and ejection time. Of note, these clinically atypical types of diastolic dysfunction occurred independently of body weight. In contrast, females did not exhibit changes in cardiovascular function between diets.ConclusionsThe higher prevalence of T2DM in males correlates with their susceptibility to develop subtle diastolic cardiac dysfunction when fed a Western style diet (throughout most of their lifespan) despite no systemic evidence of metabolic syndrome, let alone T2DM.

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Ejection time — Heart rate relationship during exercise

Cited by 13 publications

References 34 publications

The influence of physical exercise on the relation between the phase of cardiac cycle and shooting accuracy in biathlon

The influence of physical exercise on the relation between the phase of cardiac cycle and shooting accuracy in biathlon

The effect of mild dynamic exercise on the electromechanical systole of heart in non-athlete, healthy first year medical students of Bengal as a predictive biomarker of arrhythmia

Cardiovascular sexual dimorphism in a diet-induced type 2 diabetes rodent model, the Nile rat (Arvicanthis niloticus)

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