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Related Concept Videos

Insomnia01:27

Insomnia

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Insomnia is a prevalent sleep disorder characterized by difficulty falling asleep, frequent awakenings during the night, and waking up too early without being able to return to sleep. People with insomnia often experience these disruptions at least three nights a week for at least one month. Chronic insomnia, which lasts for at least three months, can lead to increased anxiety, which in turn can worsen sleep difficulties, creating a cycle of sleeplessness and stress.
Multiple factors contribute...
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Management of Insomnia01:19

Management of Insomnia

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The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...
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Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

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In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
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Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

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By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
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Rotation with Constant Angular Acceleration - I01:37

Rotation with Constant Angular Acceleration - I

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If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
Using our intuition, we can begin to see how rotational quantities such as angular displacement, angular velocity, angular acceleration, and time are related to one another. For example, if a flywheel...
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Rotation with Constant Angular Acceleration - II01:16

Rotation with Constant Angular Acceleration - II

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Kinematics is the description of motion. The kinematics of rotational motion discusses the relationships between rotation angle, angular velocity, angular acceleration, and time. One can describe many things with great precision using kinematics, but kinematics does not consider causes. For example, a large angular acceleration describes a very rapid change in angular velocity without any consideration of its cause. Thus, rotational kinematics does not represent the laws of nature.
The first...
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Study of insomnia in rotating shift-workers.

Kaushik Chatterjee1, Prakash Ambekar2

  • 1Department of Psychiatry, Armed Forces Medical College, Pune, India.

Industrial Psychiatry Journal
|February 20, 2018
PubMed
Summary

Rotating shift-workers experience more insomnia, including initial, intermediate, and terminal sleep difficulties, compared to day workers. This impacts sleep quality and daytime alertness.

Keywords:
Athens Insomnia Scaleinsomniashift-work

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Area of Science:

  • Occupational Health
  • Sleep Medicine
  • Psychiatry

Background:

  • Shift work is a common occupational hazard associated with sleep disturbances.
  • Insomnia is a prevalent issue among shift workers, affecting various sleep domains.
  • Understanding these domains is crucial for developing targeted interventions.

Purpose of the Study:

  • To investigate sleep patterns and insomnia prevalence in rotating shift workers.
  • To compare the sleep characteristics of rotating shift workers with those of day workers.
  • To evaluate specific insomnia domains affected by rotating shift work.

Main Methods:

  • A case-control study design was employed.
  • The Athens Insomnia Scale was used to assess sleep and insomnia.
  • Sleep parameters of rotating shift workers were compared against a control group of day workers.

Main Results:

  • Rotating shift workers reported significantly higher Athens Insomnia Scale scores across initial, intermediate, and terminal insomnia domains.
  • Reduced sleep duration, poorer sleep quality, and diminished sense of well-being were observed in rotating shift workers.
  • Increased daytime sleepiness was prevalent in rotating shift workers, though perceived physical and mental functioning did not differ between groups.

Conclusions:

  • Rotating shift work, particularly for over 15 days, is linked to a significantly higher prevalence of insomnia.
  • Shift work negatively impacts multiple facets of sleep and daytime functioning.
  • Interventions are needed to mitigate insomnia and improve well-being in rotating shift workers.