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Related Concept Videos

Sound Intensity Level00:53

Sound Intensity Level

4.9K
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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Sound Intensity00:58

Sound Intensity

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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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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:
6.0K
Intensity and Pressure of Sound Waves01:05

Intensity and Pressure of Sound Waves

1.8K
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...
1.8K
Interval Level of Measurement00:55

Interval Level of Measurement

19.2K
For effective statistical analysis, data are classified into four levels of measurement—nominal, ordinal, interval, and ratio.
Data measured using the interval scale are similar to ordinal level data because they have a definite arrangement. However, in the interval level of measurement, the differences between data values are meaningful even though the data does not have a starting point.
Temperature is measured using the interval scale. It is measurable data, and the difference between...
19.2K
IR Spectrum Peak Intensity: Amount of IR-Active Bonds00:55

IR Spectrum Peak Intensity: Amount of IR-Active Bonds

1.1K
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...
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Related Experiment Video

Updated: Feb 11, 2026

A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
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High-intensity interval training evokes larger serum BDNF levels compared with intense continuous exercise.

Cinthia Maria Saucedo Marquez1, Bart Vanaudenaerde2, Thierry Troosters3

  • 1KU Leuven, Department of Kinesiology and Rehabilitation Sciences, Research Center for Movement Control and Neuroplasticity, Heverlee, Belgium;

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 17, 2015
PubMed
Summary

High-intensity interval training (HIT) and continuous exercise (CON) both boost brain-derived neurotrophic factor (BDNF). HIT slightly elevated BDNF more than CON and was preferred by participants, suggesting it may be a superior intervention for brain health.

Keywords:
BDNFacute-exercisebrain healthhigh-intensity interval trainingneuroplasticity

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Area of Science:

  • Neuroscience
  • Exercise Physiology
  • Biochemistry

Background:

  • Exercise positively impacts brain function through brain-derived neurotrophic factor (BDNF) pathways.
  • Higher exercise intensity correlates with greater short-term increases in BDNF levels in healthy individuals.

Purpose of the Study:

  • To compare the efficacy of two high-intensity exercise protocols in elevating BDNF levels.
  • To assess participant preference between continuous exercise (CON) and high-intensity interval training (HIT).

Main Methods:

  • Two experiments were conducted involving healthy participants.
  • Participants underwent either a 20-minute CON protocol (70% maximal work rate) or a 20-minute HIT protocol (1 min work at 90% maximal work rate, 1 min rest).
  • Serum BDNF levels were measured, and participant preference was recorded.

Main Results:

  • Both CON and HIT protocols significantly increased BDNF levels compared to rest.
  • HIT resulted in higher BDNF concentrations than CON.
  • BDNF levels peaked towards the end of both exercise protocols.
  • A majority of participants (73%) preferred the HIT protocol.

Conclusions:

  • High-intensity interval training (HIT) is slightly more effective than continuous high-intensity exercise for increasing serum BDNF.
  • HIT may be a preferred and effective exercise strategy for enhancing BDNF and promoting brain health.