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Related Concept Videos

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...

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Related Experiment Video

Updated: May 27, 2026

Transcranial Electrical Brain Stimulation in Alert Rodents
10:08

Transcranial Electrical Brain Stimulation in Alert Rodents

Published on: November 2, 2017

Electrical stimulation - when more is less.

G H Geesink1, M H Mareko, J D Morton

  • 1Molecular Biotechnology Group, Animal and Food Sciences Division, Lincoln University, PO Box 84, Canterbury, New Zealand.

Meat Science
|November 9, 2011
PubMed
Summary
This summary is machine-generated.

Electrical stimulation can be omitted in beef processing if carcasses undergo immobilization. Freezing meat samples before cooking improves tenderness prediction, offering valuable insights for meat quality enhancement.

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Last Updated: May 27, 2026

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Area of Science:

  • Meat Science
  • Food Technology
  • Animal Science

Background:

  • Electrical stimulation is a common post-mortem treatment to improve meat tenderness.
  • The necessity of electrical stimulation when carcasses are already subjected to electrical stunning and immobilization requires investigation.
  • Understanding optimal sample preparation for predicting aged meat tenderness is crucial for the beef industry.

Purpose of the Study:

  • To determine if electrical stimulation can be omitted in beef carcasses with existing electrical stunning and immobilization.
  • To identify the most effective sample preparation method (cooked fresh, frozen, or thawed) for predicting aged meat tenderness (shear force).

Main Methods:

  • Beef carcasses were electrically immobilized (75 V, 15 Hz) for 20 or 80 seconds during exsanguination.
  • Meat quality characteristics, including tenderness, were assessed at 1 and 7 days post mortem.
  • Sample preparation methods involved cooking fresh, frozen, or thawed muscle samples to predict shear force after ageing.

Main Results:

  • Higher electrical input during immobilization resulted in similar tenderness at 1 day post mortem but tougher meat at 7 days post mortem.
  • Freezing samples significantly improved tenderness prediction compared to fresh or thawed samples.
  • Cooking samples from the frozen state demonstrated the highest predictive value for tenderness after ageing.

Conclusions:

  • Electrical immobilization alone, even at low levels, can adequately stimulate beef carcasses and prevent cold shortening.
  • Freezing and subsequent thawing of meat samples do not significantly affect cooking loss or proteolysis.
  • The tenderizing effect of freezing is likely due to ice crystal formation causing tissue damage, enhancing predictive accuracy for aged meat tenderness.