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Related Concept Videos

Movement Joints in Buildings01:27

Movement Joints in Buildings

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Movement joints in buildings are essential design elements that accommodate inevitable motions caused by various factors such as temperature changes, moisture content variations, and structural deflections. These motions, if not considered in design and construction, can lead to unsightly or dangerous damage. Movement joints are incorporated in different forms to manage these stresses and allow materials to move without causing distress.
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Anatomical Movements00:51

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Anatomical movements refer to the various actions or motions that can be performed by the body's joints and muscles. These movements are described using specific terms to provide a standardized way of discussing and understanding the range of motion at different joints.
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Functional Classification of Joints01:09

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Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
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The centroid of a body is a crucial concept in engineering and physics. Finding the centroid of a body can help determine its stability, its balance point, and even its design. In this context, consider a thin wire bent in the form of a quarter circular arc. Polar coordinates are used to calculate the centroid. The wire is first divided into small differential elements of a length equal to the radius multiplied by the differential angle.
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The adult human body usually has 206 bones, and except for the hyoid bone in the neck, each bone is connected to at least one other bone. Joints are the location where bones come together. Many joints allow for movement between the bones. At these joints, the articulating surfaces of the adjacent bones can move smoothly against each other. However, the bones of other joints may be joined by connective tissue or cartilage. These joints are designed for stability and provide little or no...
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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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Dimension and Complexity in Human Movement and Posture.

Steven Morrison1, Karl M Newell2

  • 1Old Dominion University, Norfolk, VA.

Nonlinear Dynamics, Psychology, and Life Sciences
|September 17, 2015
PubMed
Summary
This summary is machine-generated.

Motor complexity in movement and posture is low and depends on individual, environmental, and task factors. Changes in complexity occur with aging, disease, and fatigue, offering insights beyond traditional performance metrics.

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Area of Science:

  • Motor control and biomechanics
  • Human movement science
  • Complexity science

Background:

  • Understanding motor complexity is crucial for characterizing human movement.
  • Previous research has explored factors influencing motor output complexity, including individual, environmental, and task-specific constraints.
  • The concept of degrees of freedom (DF) is central to motor control theories.

Purpose of the Study:

  • To investigate the behavioral dimension of motor complexity in movement and posture.
  • To analyze how motor complexity changes across the lifespan and in different health states (aging, disease, fatigue).
  • To explore the utility of the degrees of freedom (DF) perspective in characterizing motor complexity.

Main Methods:

  • Analysis of behavioral dimensions in movement and posture.
  • Application of the degrees of freedom (DF) framework.
  • Examination of complexity variations related to aging, disease, and fatigue.

Main Results:

  • The behavioral dimension of perceptual-motor output is relatively low.
  • Motor complexity is constrained by the interaction of individual, environmental, and task factors.
  • Complexity varies within a limited adaptive range for specific motor tasks.

Conclusions:

  • Determining the dimension of movement and posture provides a novel perspective beyond traditional performance scores.
  • The degrees of freedom (DF) approach offers a valuable, though not exhaustive, characterization of motor complexity.
  • Motor complexity is an emergent property influenced by multiple interacting constraints.