The relationship of heart rate patterns and tissue pH in the human fetus

1979 ◽  
Vol 134 (6) ◽  
pp. 685-690 ◽  
Author(s):  
Bruce K. Young ◽  
Miriam Katz ◽  
Steven A. Klein
Keyword(s):  
Heart Rate ◽  
Human Fetus ◽  
Tissue Ph ◽  
Relationship Of ◽  
The Relationship

Energy expenditure by elite midget male ice hockey players in small-sided games

2017 ◽  
Vol 12 (4) ◽  
pp. 504-513 ◽  
Author(s):  
Charles-Mathieu Lachaume ◽  
François Trudeau ◽  
Jean Lemoyne
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Energy Expenditure ◽  
Ice Hockey ◽  
Training Method ◽  
Hockey Players ◽  
Treadmill Testing ◽  
Effective Training ◽  
Relationship Of ◽  
The Relationship

The purpose of this study was to investigate the energy expenditure and heart rate responses elicited in elite male midget ice hockey players during small-sided games. Nine players (aged 15.89 ± 0.33 years) participated in the study. Maximal progressive treadmill testing in the laboratory measured the relationship of oxygen consumption ([Formula: see text]) to heart rate before on-ice assessments of heart rate during six different small-sided games: 1v1, 2v2, 2v2 with support player, 3v3 with support player, 3v3 with transitions, and 4v4 with two support players. Heart rate was recorded continuously in each game. 3v3 T small-sided game was the most intense for all four intensity markers. All six small-sided games reached 89% HRmax or more with heart rate peaks in active effort repetition. These findings demonstrate that such small-sided games are considered as high intensity games and are an effective training method for ice hockey players.

scholarly journals Heart Rate Dependency and Inter-Lead Variability of the T Peak – T End Intervals

2020 ◽  
Vol 11 ◽  
Author(s):  
Irena Andršová ◽  
Katerina Hnatkova ◽  
Martina Šišáková ◽  
Ondřej Toman ◽  
Peter Smetana ◽  
...  
Keyword(s):  
Heart Rate ◽  
Three Dimensional ◽  
Rate Dependency ◽  
Rate Dependent ◽  
Heart Rate Correction ◽  
Ecg Leads ◽  
Relationship Of ◽  
The Relationship ◽  
Vector Magnitude

The electrocardiographic (ECG) assessment of the T peak–T end (Tpe) intervals has been used in many clinical studies, but several related physiological aspects have not been reported. Specifically, the sources of the Tpe differences between different ECG leads have not been systematically researched, the relationship of Tpe duration to underlying heart rate has not been firmly established, and little is known about the mutual correspondence of Tpe intervals measured in different ECG leads. This study evaluated 796,620 10-s 12-lead ECGs obtained from long-term Holters recorded in 639 healthy subjects (311 female) aged 33.8 ± 9.4 years. For each ECG, transformation to orthogonal XYZ lead was used to measure Tpe in the orthogonal vector magnitude (used as a reference for lead-to-lead comparisons) and to construct a three-dimensional T wave loop. The loop roundness was expressed by a ratio between its circumference and length. These ratios were significantly related to the standard deviation of Tpe durations in different ECG leads. At the underlying heart rate of 60 beats per minute, Tpe intervals were shorter in female than in male individuals (82.5 ± 5.6 vs 90.0 ± 6.5 ms, p < 0.0001). When studying linear slopes between Tpe intervals measured in different leads and the underlying heart rate, we found only minimal heart rate dependency, which was not systematic across the ECG leads and/or across the population. For any ECG lead, positive Tpe/RR slope was found in some subjects (e.g., 79 and 25% of subjects for V2 and V4 measurements, respectively) and a negative Tpe/RR slope in other subjects (e.g., 40 and 65% for V6 and V5, respectively). The steepest positive and negative Tpe/RR slopes were found for measurements in lead V2 and V4, respectively. In all leads, the Tpe/RR slope values were close to zero, indicating, on average, Tpe changes well below 2 ms for RR interval changes of 100 ms. On average, longest Tpe intervals were measured in lead V2, the shortest in lead III. The study concludes that the Tpe intervals measured in different leads cannot be combined. Irrespective of the measured ECG lead, the Tpe interval is not systematically heart rate dependent, and no heart rate correction should be used in clinical Tpe investigations.

scholarly journals The relationship of trauma exposure to heart rate variability during wake and sleep in midlife women

2019 ◽  
Vol 57 (4) ◽  
Author(s):  
Rebecca C. Thurston ◽  
Mary Y. Carson ◽  
Karestan C. Koenen ◽  
Yuefang Chang ◽  
Karen A. Matthews ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Trauma Exposure ◽  
Midlife Women ◽  
Relationship Of ◽  
The Relationship

Fitness Load and Exercise Time in Secondary Physical Education Classes

1993 ◽  
Vol 12 (2) ◽  
pp. 180-187 ◽  
Author(s):  
Xiao Jun Li ◽  
Paul Dunham
Keyword(s):  
Heart Rate ◽  
Physical Education ◽  
Student Behavior ◽  
Skill Level ◽  
Exercise Time ◽  
Record Heart Rate ◽  
Classified Students ◽  
The Mean ◽  
Relationship Of ◽  
The Relationship

This study investigated the effect of secondary school physical education on fitness load. Fitness load was defined as the product of the mean heart rate above threshold (144 bpm) and fitness time (the duration of the heart rate above threshold). The relationship of fitness load and skill level of students was also studied. Teachers of 24 classes classified students as having high, moderate, or low skill ability. Seventy-two students, 1 from each skill level in each class, wore heartwatches to record heart rate at 15-s intervals. Student behavior was videotaped and coded. Twenty-one percent of the classes produced an overload effect, and 79% did not. The highly and moderately skilled students achieved fitness load more frequently than their lower skilled colleagues. The relationship between fitness load and percentage of time exercising was r = .66, indicating 44% common variance.

scholarly journals THE RELATIONSHIP OF SHORT-TERM MEASURES OF HRV TO HEART RATE AND EXERCISE INTENSITY 795

1997 ◽  
Vol 29 (Supplement) ◽  
pp. 138
Author(s):  
R. W. Thompson ◽  
J. W. Wilkinson ◽  
R. M.T. Laukkanan ◽  
T. Sepp??nen
Keyword(s):  
Heart Rate ◽  
Exercise Intensity ◽  
Short Term ◽  
Relationship Of ◽  
The Relationship

scholarly journals HEART RATE VARIABILITY AS A REFLECTION OF THE TONE OF THE VEGETATIVE NERVOUS SYSTEM OF SURGERY OF TUMORS OF THE REPRODUCTIVE SYSTEM OF WOMEN

2021 ◽  
Vol 2 (71) ◽  
pp. 6-9
Author(s):  
B. Kozhomberdiev ◽  
Ch. Makimbetova
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Nervous System ◽  
Reproductive System ◽  
Heart Rhythm ◽  
Vegetative Nervous System ◽  
Parasympathetic System ◽  
Relationship Of ◽  
The Relationship

The article presents the results of a study of heart rate variability at women after hysterectomy with appendages. There were showed the relationship of the sympathetic and parasympathetic system in the regulation of the heart rhythm. 

scholarly journals Associations of Blood Pressure and Heart Rate and Their Contribution to the Development of Cardiovascular Complications and All-Cause Mortality in the Russian Population of 25-64 Years

2020 ◽  
Vol 16 (5) ◽  
pp. 759-769
Author(s):  
S. A. Shalnova ◽  
V. A. Kutsenko ◽  
A. V. Kapustina ◽  
E. B. Yarovaya ◽  
Yu. A. Balanova ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Cardiovascular Complications ◽  
Adverse Outcomes ◽  
Average Value ◽  
Risk Of Mortality ◽  
The Right ◽  
Relationship Of ◽  
The Relationship

Aim. To study the relationship of blood pressure (BP) and heart rate (HR) in a sample of men and women 25-64 years old and their predictive value for the development of fatal and non-fatal cardiovascular diseases (CVD) and mortality from all causes.Material and methods. Prospective observation was for cohorts of the population aged 25-64 years from 11 regions of the Russian Federation. 18,251 people were included in the analysis. Each participant gave written informed consent. All surveyed persons were interviewed with a standard questionnaire. BP was measured on the right hand with an automatic tonometer. BP and HR were measured twice with an interval of 2-3 min with the calculation of the average value. The patients were divided into 4 groups: the first group with BP<140/90 ><140/90 mm Hg and HR≤80 beats/min; the second group – BP<140/><140/90 mm Hg and HR>80; the third group – BP≥140/90 mm Hg and HR≤80; the fourth group – BP≥140/90 mm Hg and HR>80 beats/min. Risk factors and cardiovascular history were analyzed as well. Deaths over 6 years of follow-up occurred in 393 people (141 – from CVD). Statistical analysis was performed using the open source R3.6.1 system.Results. A HR>80 beats/min was found in 26.3% of people with BP≥140/90 mm Hg, regardless of medication. Analysis of the associations between HR and BP showed that for every increase in HR by 10 beats/min, systolic BP increases by 3 mm Hg. (p<0.0001). The group with HR>80 beats/min and BP≥140/90 mm Hg had the shortest life expectancy (p<0.001). Adding an increased HR to BP≥140/90 mm Hg significantly><0.001). Adding an increased HR to BP≥140/90 mm Hg significantly worsened the prognosis of patients. Similar results were obtained in the analysis of cardiovascular survival. Elevated BP and elevated HR had the same effect on outcomes, except for the combined endpoint, where the contribution of elevated BP was predominant. However, their combined effect was the largest and highly significant for the development of the studied outcomes, even after adjusting for other predictors. With an increase in HR by every 10 beats/min, the risk of mortality increased statistically significantly by 22%.Conclusion. The prevalence of HR>80 beats/min in people with BP≥140 mm Hg amounted to 26.34%. Every 10 beats/min significantly increases the risk of mortality by 22%. Increased HR with elevated BP leads to increased adverse outcomes.

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