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Pulmonary Function Tests01:25

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Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
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Transfer Function in Control Systems01:21

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The transfer function is a fundamental concept in the analysis and design of linear time-invariant (LTI) systems. It offers a concise way to understand how a system responds to different inputs in the frequency domain. It serves as a bridge between the time-domain differential equations that describe system dynamics and the frequency-domain representation that facilitates easier manipulation and analysis.
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Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of that molecule. For example, the presence of certain functional groups on a molecule will make them hydrophilic, whereas others will make them hydrophobic. These functional groups are an indispensable part of organic chemistry and important components of biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids. Each...
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William James, John Dewey, and Charles Sanders Peirce were instrumental in founding functional psychology, which draws heavily from Darwin's theory of evolution by natural selection. This theory suggests that individual traits, including behaviors, are adapted to their environments through natural selection. At the heart of functionalism is the concept of adaptation, meaning that a trait enhances an individual's chances of survival and reproduction.
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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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Related Experiment Video

Updated: Jan 22, 2026

Dual-Task Stroop Paradigm for Detecting Cognitive Deficits in High-Functioning Stroke Patients
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Relationship between pulmonary function, functional independence, and trunk control in patients with stroke.

Rafaela Sant'anna Dos Santos1, Sara Carolina Fontoura Dall'alba1, Soraia Genebra Ibrahim Forgiarini2

  • 1Centro Universitário Metodista, Porto Alegre, RS, Brasil.

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|July 18, 2019
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Summary

Stroke survivors often experience reduced respiratory muscle strength, pulmonary function, and trunk control. These impairments correlate with decreased functional independence, highlighting the need for targeted rehabilitation strategies.

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Area of Science:

  • Neurology
  • Rehabilitation Medicine
  • Pulmonary Medicine

Background:

  • Stroke frequently causes motor control deficits affecting respiratory and peripheral muscles.
  • Impaired trunk control can impact overall functional recovery post-stroke.

Purpose of the Study:

  • To assess respiratory muscle strength, pulmonary function, trunk control, and functional independence in stroke patients.
  • To investigate the correlation between trunk control and other functional parameters in stroke survivors.

Main Methods:

  • Cross-sectional study involving 44 patients diagnosed with stroke.
  • Assessment of respiratory muscle strength, spirometry, Trunk Impairment Scale, and Functional Independence Measure.

Main Results:

  • Stroke patients exhibited significantly lower pulmonary function and respiratory muscle strength than predicted.
  • A significant positive correlation was observed between trunk control and functional independence (r = 0.77, p < 0.05).
  • Trunk control also showed significant correlations with maximal inspiratory pressure, forced vital capacity, and forced expiratory volume in one second.

Conclusions:

  • Stroke is associated with reduced respiratory muscle strength, pulmonary function, trunk control, and functional independence.
  • Trunk control is a key factor associated with functional outcomes in stroke patients.