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Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

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The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
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Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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Regulation of Heart Rates01:31

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The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
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Blood Studies for Cardiovascular System III: Serum Lipid Profile01:25

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Understanding serum lipids is crucial for maintaining cardiovascular health and preventing heart disease and stroke.
Serum lipids are fats and fatty substances in the blood and are crucial for various bodily functions, including energy storage, cellular structure, and hormone production. Serum lipids consist of cholesterol, triglycerides, and phospholipids.
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
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Related Experiment Video

Updated: Apr 3, 2026

Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy
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Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy

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Sex-Specific Heart Rate Variability Associations With Vitamin B12, Folate, and Iron Status.

Mehmet Özyaşar1, Selçuk Öztürk1, Tolga Memioğlu2

  • 1Cardiology Department, Konya City Hospital, 42020 Konya, Türkiye.

Reviews in Cardiovascular Medicine
|April 2, 2026
PubMed
Summary

Micronutrient status impacts heart rate variability (HRV) in patients with palpitations. Elevated iron-binding capacity (IBC) is linked to reduced HRV, while folate may improve it, suggesting a need for nutritional assessment.

Keywords:
Vitamin B12ambulatory electrocardiographyautonomic nervous systemfolic acidheart rateironsex factors

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Area of Science:

  • Cardiology
  • Clinical Biochemistry
  • Nutritional Science

Background:

  • Heart rate variability (HRV) assessment is crucial for evaluating autonomic function in patients with palpitations.
  • The influence of micronutrient status, particularly sex-specific effects, on HRV in this population is not well understood.

Purpose of the Study:

  • To investigate the demographic and biochemical factors, including micronutrient status, that determine HRV in adults presenting with palpitations.
  • To identify predictors of HRV in a clinical cohort undergoing Holter monitoring.

Main Methods:

  • Retrospective analysis of 213 adults (18-65 years) with palpitations and 24-hour Holter monitoring.
  • Exclusion of patients with cardiovascular disease, arrhythmias, or conditions affecting autonomic function.
  • Statistical analysis of demographic variables, laboratory parameters, and HRV indices, focusing on the standard deviation of normal-to-normal intervals (SDNN).

Main Results:

  • Lower SDNN was observed in women and older adults.
  • Univariate analysis showed associations between SDNN and age, male sex, ferritin, serum iron, folate, and Vitamin B12.
  • Multivariable analysis identified male sex, iron-binding capacity (IBC), and folate as independent predictors of SDNN, with elevated IBC linked to reduced HRV and higher folate to better autonomic modulation.

Conclusions:

  • Demographic factors and iron metabolism markers significantly influence HRV in patients with palpitations.
  • Elevated IBC, indicating functional iron deficiency, is associated with impaired autonomic regulation, independent of anemia.
  • Adequate folate status may support favorable autonomic function, highlighting the importance of nutritional assessment in evaluating autonomic function.