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Related Concept Videos

Biological Clocks and Seasonal Responses02:45

Biological Clocks and Seasonal Responses

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.
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

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 years,...
Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

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,...
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

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 years,...
Cardiac Cycle01:29

Cardiac Cycle

The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
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Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
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Related Experiment Video

Updated: Jul 20, 2026

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures
06:53

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures

Published on: November 11, 2016

Cardiovascular chronobiology: do you know what time it is?

E J Bridges1, S L Woods

  • 1USAF, 59th Medical Wing, Lackland AFB, San Antonio, TX, USA.

Progress in Cardiovascular Nursing
|May 24, 2001
PubMed
Summary

Cardiovascular rhythms, like blood pressure and heart rate, fluctuate daily. These daily variations can increase the risk of heart attack or stroke, especially after waking.

Area of Science:

  • Cardiology
  • Chronobiology
  • Physiology

Background:

  • Cardiovascular indices (blood pressure, heart rate, cardiac output, fibrinolytic factors) exhibit significant 24-hour variations.
  • Nocturnal blood pressure can drop significantly (30-50 mm Hg), and heart rate can decrease to 25 beats per minute.
  • These physiological rhythms interact and influence the timing of cardiovascular events.

Purpose of the Study:

  • To discuss the nature of cardiovascular rhythms.
  • To explain the rhythmic increase in risk for cardiovascular catastrophes.
  • To provide a framework for developing protective interventions.

Main Methods:

  • Literature review and synthesis of existing research on cardiovascular rhythms and event timing.
  • Analysis of the interplay between physiological fluctuations and cardiovascular risk.

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Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

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Related Experiment Videos

Last Updated: Jul 20, 2026

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures
06:53

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures

Published on: November 11, 2016

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

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10:16

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

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  • Development of a conceptual framework for understanding risk patterns.

    • Main Results:

    • Cardiovascular indices demonstrate predictable daily patterns.
    • A heightened risk for myocardial infarction, sudden cardiac arrest, and stroke occurs within the first 6 hours post-awakening.
    • Interactions between cardiovascular rhythms are implicated in triggering acute events.

    Conclusions:

    • Understanding daily cardiovascular rhythms is essential for patient assessment and care planning.
    • Interventions targeting activity and medication timing can mitigate risks during high-risk periods.
    • Nursing actions are vital in protecting patients from cardiovascular events linked to circadian variations.