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Related Concept Videos

Motor Unit Stimulation01:20

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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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The Neuromuscular Junction01:19

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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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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
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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
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The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
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Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation
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Report on Adaptive Force, A Specific Neuromuscular Function.

Marko Hoff1, Laura Schaefer1, Nancy Heinke1

  • 1Section Regulative Physiology and Prevention, Department of Sport and Health Sciences, University of Potsdam , Germany.

European Journal of Translational Myology
|February 26, 2016
PubMed
Summary

Adaptive Force (AF) measures the neuromuscular system's ability to adapt to external forces during muscle actions. This study introduces AF and a novel measuring system to capture its unique characteristics in real-life motions.

Keywords:
Adaptive Forceisometric-eccentric forcemuscle actionpneumatic force measuring system

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Sports Science

Background:

  • Neuromuscular adaptation to external forces is crucial in real-life motions and sports.
  • The concept of Adaptive Force (AF) is introduced to characterize this neuromuscular adaptation.
  • Existing force concepts do not fully encompass this specific neuromuscular function.

Purpose of the Study:

  • Introduce and define the concept of Adaptive Force (AF).
  • Evaluate a novel measuring system designed to capture AF.
  • Discuss the classification of AF within known force concepts.

Main Methods:

  • Development and evaluation of a specialized measuring system for AF.
  • Recording of isometric submaximal AF (AFiso), maximal isometric AF (AFisomax), and maximal eccentric AF (AFeccmax).
  • Analysis of the system's ability to capture real-life motion characteristics like submaximal intensities and varying external forces.

Main Results:

  • The developed measuring system can capture specific characteristics of Adaptive Force.
  • Three distinct force qualities (AFiso, AFisomax, AFeccmax) provide unique neuromuscular insights.
  • Preliminary reference values for AF were obtained.

Conclusions:

  • Adaptive Force (AF) represents a distinct neuromuscular function.
  • The developed system effectively measures AF, offering insights into conditional and coordinative abilities.
  • AF measurement provides valuable data for understanding neuromuscular adaptation in diverse contexts.