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Center of Mass: Introduction01:03

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Any object that obeys Newton's second law of motion is made up of a large number of infinitesimally small particles. Objects in motion can be as simple as atoms or as complex as gymnasts performing in the Olympics. The motion of such objects is described about a point called the center of mass of the object. The center of mass of an object is a point that acts as if the whole mass is concentrated at that point. The center of mass of an object with a large number of infinitesimally small...
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Equation of Motion: Center of Mass01:14

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The equation of motion for a single particle can be expanded to encompass a system of particles consisting of n particles. For any arbitrarily chosen particle within this system, the net force acting upon it is the aggregate of both internal and external forces. Extending this principle to all particles within the system results in the equation of motion for the entire assembly.
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Center of Mass00:59

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The center of mass is the point at which the total mass of an object can be said to be concentrated. It is a fundamental principle in mechanics and physics that applies to all objects regardless of their shape or size. The center of gravity is the point at which an object’s weight appears to be concentrated and can be used to balance the object perfectly.
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The center of gravity (COG) of an object is the point where the object's total weight is considered to be concentrated. Knowing the location of the center of gravity is useful when predicting the behavior of a moving object or designing static structures. In a uniform gravitational field, the center of gravity is similar to the center of mass (COM); yet, these two points can be positioned differently. For example, the Moon's center of mass lies very close to its geometric center, but...
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Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
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The center of mass of an object is defined as the mass-weighted average position of all the particles that comprise the object. The significance of the center of mass of an object can be seen by looking at its dynamics. The time derivative of the center of mass gives its velocity, assuming that the object's mass remains constant over time. Furthermore, the total linear momentum of an object can be seen as the linear momentum of a single particle of the object's total mass moving with...
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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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Synergy-Dependent Center-of-Mass Control Strategies During Sit-to-Stand Movements.

Simone Ranaldi1, Leonardo Gizzi2,3, Giacomo Severini4

  • 1Department of Industrial, Electronics and Mechanical EngineeringRoma Tre University 00154 Rome Italy.

IEEE Open Journal of Engineering in Medicine and Biology
|November 20, 2024
PubMed
Summary
This summary is machine-generated.

Understanding muscle synergies in functional tests reveals how motor control strategies impact movement. More synergies allow for broader movement patterns, suggesting new rehabilitation approaches.

Keywords:
Muscle synergiesphase space analysissit-to-stand

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Area of Science:

  • Biomechanics
  • Motor Control
  • Neuroscience

Background:

  • Muscle synergies are widely used to characterize clinical functional tests and describe motor control strategies.
  • However, the biomechanical correlates of synergistic activity require further elucidation.

Purpose of the Study:

  • To investigate the relationship between muscle synergy activity and center of mass (CoM) kinematic patterns during sit-to-stand tasks.
  • To determine if varying numbers of muscle synergies influence the exploration of different phase-space regions.

Main Methods:

  • Healthy subjects performed sit-to-stand tasks while electromyographic (EMG) data was recorded for muscle synergy extraction.
  • An optimal model selection criterion was used to group participants based on their number of synergies.
  • Synergistic activity was mapped onto the CoM phase-space to analyze kinematic patterns.

Main Results:

  • An increased number of muscle synergies was associated with wider trajectories in the CoM phase-space.
  • This suggests that more motor modules enable greater exploration of movement possibilities.

Conclusions:

  • The findings support the use of kinematic feedback to modulate muscle synergy activity.
  • This opens avenues for developing novel synergy-based rehabilitation and training protocols.