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Related Concept Videos

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...
Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
Smooth Muscle Contraction01:25

Smooth Muscle Contraction

Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
The onset of contraction is triggered by an increase in calcium ions within the sarcoplasm, similar to the process in striated muscle. However, smooth muscles have a relatively smaller reservoir of the sarcoplasmic...
Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
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...

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Related Experiment Video

Updated: May 7, 2026

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
14:02

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles

Published on: November 1, 2012

Decrease in muscle contraction time complements neural maturation in the development of dynamic manipulation.

Sudarshan Dayanidhi1, Jason J Kutch, Francisco J Valero-Cuevas

  • 1Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, California 90089, and Department of Biomedical Engineering, University of Southern California, Los Angeles, California 90089.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 20, 2013
PubMed
Summary
This summary is machine-generated.

Improvements in dynamic manipulation skills are linked to faster muscle contraction times in humans. This study reveals that peripheral motor system changes, specifically muscle contraction speed, play a key role alongside neural maturation in developing fine motor control.

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Engineering and Characterization of an Optogenetic Model of the Human Neuromuscular Junction
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The Neuromuscular Junction: Measuring Synapse Size, Fragmentation and Changes in Synaptic Protein Density Using Confocal Fluorescence Microscopy
12:18

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Published on: December 26, 2014

Area of Science:

  • Neuroscience
  • Motor Control
  • Human Development

Background:

  • Dynamic manipulation skills typically improve with age, attributed to neural maturation processes like myelination and synaptogenesis.
  • The role of peripheral motor system changes, particularly muscle activation-contraction dynamics, in this developmental trajectory is less understood.

Purpose of the Study:

  • To investigate developmental changes in muscle activation-contraction dynamics in humans.
  • To determine if these peripheral changes contribute to improved dynamic manipulation abilities.

Main Methods:

  • Compared pinch strength, dynamic manipulation ability, and first dorsal interosseous muscle contraction time across preadolescent, adolescent, and adult age groups.
  • Utilized statistical analyses to assess age-related differences and associations between variables.

Main Results:

  • Both pinch strength and dynamic manipulation ability significantly increased with age.
  • Adults exhibited a 33% shorter muscle contraction time compared to preadolescents.
  • Muscle contraction time was significantly associated with dynamic manipulation abilities.

Conclusions:

  • Decreased muscle contraction time during development is a phenomenon observed in humans for the first time.
  • Changes in peripheral muscle contractile properties complement neural maturation in the development of dynamic manipulation.
  • Findings offer insights into central and peripheral factors affecting manipulation in typical and atypical development, such as cerebral palsy.