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Related Concept Videos

Pulse rhythm01:30

Pulse rhythm

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
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ECG Interpretation of Rhythms01:24

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An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
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Electrophysiology of Normal Cardiac Rhythm01:19

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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters
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The inner clock-Blue light sets the human rhythm.

Siegfried Wahl1,2, Moritz Engelhardt1, Patrick Schaupp2

  • 1Institute for Ophthalmic Research, University of Tuebingen, Tuebingen, Germany.

Journal of Biophotonics
|August 22, 2019
PubMed
Summary
This summary is machine-generated.

Blue light synchronizes our internal biological clock, impacting sleep and mood. While beneficial during the day, evening blue light exposure can disrupt sleep, highlighting the need for managing modern device use.

Keywords:
blue lightcircadian rhythmmelanopsinmelatoninvisible light

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Area of Science:

  • Chronobiology
  • Neuroscience
  • Ophthalmology

Background:

  • Visible light, particularly blue wavelengths, synchronizes the human biological clock located in the suprachiasmatic nuclei.
  • The circadian system, regulated by this clock, governs essential biological and psychological rhythms, crucial for organismal function.
  • Disruptions in circadian rhythms are linked to psychiatric and neurodegenerative disorders.

Purpose of the Study:

  • To investigate the role of light spectral composition, timing, and intensity on circadian synchronization.
  • To understand the impact of blue light exposure on melatonin secretion, sleep quality, mood, and cognitive performance.
  • To address the challenges posed by increasing blue light exposure from electronic devices in modern society.

Main Methods:

  • Analysis of light's spectral composition and its effect on the circadian system.
  • Evaluation of light exposure timing and intensity in relation to physiological responses.
  • Assessment of blue light's impact on melatonin suppression and circadian phase.

Main Results:

  • Blue light is the most potent synchronizing agent for the circadian system.
  • Daytime blue light exposure suppresses melatonin, enhancing alertness and cognitive performance.
  • Chronic, low-intensity blue light exposure before bedtime negatively affects sleep quality and circadian timing.

Conclusions:

  • Optimizing light exposure (spectral composition, timing, intensity) is vital for circadian health.
  • Managing blue light exposure from digital devices is necessary to mitigate negative impacts on sleep and well-being.
  • Further research is needed to develop strategies for balancing the benefits and drawbacks of blue light exposure.