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Classification of Skeletal Muscle Fibers01:48

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
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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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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
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Sound Intensity Level00:53

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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.
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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
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Resistance01:19

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When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
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Muscle Quality Improves with Extended High-Intensity Resistance Training after Hip Fracture.

R A Briggs1, J R Houck, M J Drummond

  • 1Dr Robert A. Briggs, David Grant USAF Medical Center, 101 Bodin Circle, Travis AFB CA, 94535, USA; Phone: 208-520-6884; FAX: (707) 423-5242;

The Journal of Frailty & Aging
|February 8, 2018
PubMed
Summary
This summary is machine-generated.

High-intensity resistance training improved muscle mass, strength, and quality in older adults after hip fracture. These gains occurred in addition to standard physical therapy, enhancing functional recovery.

Keywords:
Muscle qualityhip fracturephysical function

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Area of Science:

  • Gerontology
  • Exercise Physiology
  • Orthopedics

Background:

  • Muscle mass deficits persist post-hip fracture, impacting mobility and function.
  • The effectiveness of post-rehabilitation training on muscle quality after hip fracture remains unclear.

Purpose of the Study:

  • To investigate if high-intensity resistance training and protein supplementation enhance muscle quality in individuals recovering from hip fracture.

Main Methods:

  • A case series involving 17 older adults (average age 77) 3.6 months post-hip fracture.
  • 12 weeks of unilateral resistance training (3x/week) with measurements of quadriceps muscle (lean mass, IMAT) via MRI and peak isometric knee extension force.
  • Muscle quality was calculated as peak force divided by lean muscle mass; physical function was also assessed.

Main Results:

  • Significant improvements in lean quadriceps muscle mass and peak isometric knee extension force in the surgical limb.
  • Muscle quality and physical function variables showed significant gains post-training.
  • Intramuscular adipose tissue (IMAT) remained unchanged.

Conclusions:

  • High-intensity resistance training can improve muscle mass, strength, and quality in the surgical limb after hip fracture, beyond standard care.
  • These findings suggest potential for improved long-term functional recovery in this population.
  • Further research is needed to establish the long-term impact of muscle quality on functional recovery post-hip fracture.