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Related Concept Videos

Isotonic and Isometric Muscle Contractions01:22

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Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
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In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive...
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Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
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Related Experiment Video

Updated: Feb 24, 2026

Three-Dimensional Finger Motion Tracking during Needling: A Solution for the Kinematic Analysis of Acupuncture Manipulation
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An open-source model and solution method to predict co-contraction in the finger.

Alexander R MacIntosh1, Peter J Keir1

  • 1a Department of Kinesiology , McMaster University , Hamilton , Canada.

Computer Methods in Biomechanics and Biomedical Engineering
|August 19, 2017
PubMed
Summary
This summary is machine-generated.

A new biomechanical model of the index finger improves co-contraction estimates and tendon tension analysis. This tool enhances understanding of finger mechanics for better rehabilitation and injury prevention strategies.

Keywords:
FingerOpenSimextensor mechanismmusculoskeletal modelstatic optimization

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Computational Modeling

Background:

  • Accurate biomechanical models are crucial for understanding finger function.
  • Existing models have limitations in estimating co-contraction and tendon forces.
  • Electromyography (EMG) data can refine biomechanical simulations.

Purpose of the Study:

  • To develop a novel open-source biomechanical model of the index finger.
  • To implement an electromyography (EMG)-constrained static optimization method.
  • To improve co-contraction estimates and assess tendon tension distribution in the index finger.

Main Methods:

  • Developed a four-degree-of-freedom biomechanical model of the index finger (Intrinsic model).
  • Created a custom OpenSim plugin for EMG-constrained static optimization.
  • Collected 3D kinematics, force, and EMG data from ten participants during static and dynamic tasks.

Main Results:

  • The Intrinsic model predicted a 29% increase in co-contraction during static pressing compared to existing models.
  • Tendon tension distribution patterns and forces were determined across various finger postures.
  • The model successfully facilitated force propagation through improved co-contraction estimates.

Conclusions:

  • The novel Intrinsic model and EMG-constrained method enhance the accuracy of co-contraction estimation.
  • This approach provides valuable insights into finger tendon tension distribution.
  • The developed tools improve the interpretation of finger loading for rehabilitation and injury risk reduction.