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Related Concept Videos

Sound Intensity00:58

Sound Intensity

4.7K
The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
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Sound Intensity Level00:53

Sound Intensity Level

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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
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Intensity Of Electromagnetic Waves01:22

Intensity Of Electromagnetic Waves

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The energy transport per unit area per unit time, or the Poynting vector, gives the energy flux of an electromagnetic wave at any specific time. For a plane electromagnetic wave with E0 and B0 as the peak electric and magnetic fields and traveling along the x-axis, the time-varying energy flux can be given by the following equation:
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Intensity and Pressure of Sound Waves01:05

Intensity and Pressure of Sound Waves

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The intensity of sound waves can be related to displacement and pressure amplitudes by using their wave expressions and the definition of intensity. The critical step to achieve this is to write the power delivered by the particles on the wave as the product of force and velocity and simplify the force per unit area as the pressure. The velocity of the medium's particles can be derived from the displacement.
Unlike the time average of a sinusoidal term, which is zero since it is positive...
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IR Spectrum Peak Intensity: Amount of IR-Active Bonds00:55

IR Spectrum Peak Intensity: Amount of IR-Active Bonds

1.0K
When infrared radiation is passed through a molecule, absorption occurs if the molecule's vibration leads to a substantial change in its bond dipole moment. Transitions between vibrational energy levels, typically corresponding to infrared frequencies (4000–400 cm−1), allow absorption if the vibration significantly alters the dipole moment, making the molecule infrared active. The molecular bonds have different stretching and bending vibrations, resulting in various peaks with...
1.0K
IR Spectrum Peak Intensity: Dipole Moment01:20

IR Spectrum Peak Intensity: Dipole Moment

1.5K
The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...
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Tesamorelin as an Adjunct to Exercise for Improving Physical Function in HIV (TRIUMPH): a clinical trial protocol.

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Physical activity promotion among HIV providers in Colorado: an explanatory sequential mixed-methods study.

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Related Experiment Video

Updated: Jan 27, 2026

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training
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Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training

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Comparing the Effectiveness of High Intensity Interval Training vs Continuous Moderate Intensity Exercise on Physical

Grace L Kulik1, Vitor H F Oliveira2, Melissa P Wilson1,3

  • 1Department of Medicine, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA.

Open Forum Infectious Diseases
|January 26, 2026
PubMed
Summary

High-intensity interval training (HIIT) and continuous moderate-intensity exercise (CME) both improved physical function in older people with HIV (PWH). No significant differences were found between HIIT and CME, suggesting PWH can choose exercise based on preference.

Keywords:
HIVexerciseolder adultsphysical function

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Area of Science:

  • Exercise Physiology
  • Gerontology
  • Infectious Disease

Background:

  • People with HIV (PWH) experience accelerated physical function decline.
  • Exercise is beneficial, but optimal exercise type for older PWH is unclear.
  • This study compares high-intensity interval training (HIIT) and continuous moderate-intensity exercise (CME) in older PWH.

Purpose of the Study:

  • To determine if HIIT improves physical function more than CME in older PWH.
  • To compare the efficacy of 16 weeks of HIIT versus CME on physical function in PWH.
  • To assess changes in 400-meter walk time and muscle strength.

Main Methods:

  • The HEALTH trial randomized sedentary PWH (age ≥50) on stable ART to 16 weeks of HIIT or CME with resistance training.
  • HIIT involved 9 high-intensity (4 min) and moderate-intensity (3 min) bouts.
  • CME involved continuous walking at moderate intensity; primary outcome was % change in 400-meter walk time.

Main Results:

  • 111 participants completed the primary analysis (57 HIIT, 54 CME).
  • Both HIIT and CME significantly improved 400-meter walk time (P < .05).
  • No significant difference in 400-meter walk time improvement was observed between HIIT and CME (P = .33).

Conclusions:

  • HIIT and CME similarly improved physical function and muscle strength in older PWH.
  • The observed differences between HIIT and CME were not statistically significant.
  • PWH are encouraged to choose aerobic exercise based on personal preference for improved physical function.