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Related Concept Videos

Anatomical Positions01:11

Anatomical Positions

In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
The feet are parallel and flat on the floor.
The arms are hanging by the...
Normal Stress01:19

Normal Stress

Normal stress is a type of stress that occurs when forces act perpendicular, or normal, to a material's cross-sectional area. This stress often arises in structures when subjected to axial loading, which is the application of force along the axis of an object. A practical example of this can be found in bridge truss members.
When a rod is under axial loading, the internal forces and corresponding stress are normal to the plane of the section, so it is termed normal stress. It's important to...
Introduction to Joints00:58

Introduction to Joints

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 movement.
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.
Equations of Equilibrium in Three Dimensions01:30

Equations of Equilibrium in Three Dimensions

When analyzing structures or systems at rest, it is necessary to ensure they are in equilibrium. This is where the vector and scalar equations of equilibrium come into play. These equations are crucial in ensuring a structure is stable and will not collapse or fall apart. The vector and scalar equations of equilibrium provide a framework for analyzing the forces acting on a body.
According to the vector equations of equilibrium, the vector sum of all the external forces acting on a body must...
Reflex Activity01:08

Reflex Activity

A reflex activity is an automatic, involuntary response to specific stimuli. It is a part of our survival mechanism, designed to protect us from potential harm. For example, when a bright light suddenly shines into our eyes, we instinctively close them or look away. This is a simple reflex activity orchestrated by the nervous system without conscious thought or effort.
A reflex exam is a diagnostic procedure performed by a healthcare professional to evaluate the functionality of a patient's...

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Related Experiment Video

Updated: May 9, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
08:24

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

A description of normal relaxed standing postures.

M D D'Angelo1, D W Grieve, L Fernandez Pereira

  • 1Biomechanics Laboratory, Royal Free Hospital School of Medicine, London, UK.

Clinical Biomechanics (Bristol, Avon)
|August 7, 2013
PubMed
Summary

The Posturegram, a photographic method for measuring relaxed standing posture, is inexpensive and suitable for clinical use. Analysis of 42 subjects revealed correlated postural features, suggesting group analysis for better insights.

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Last Updated: May 9, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
08:24

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication
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Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication

Published on: December 11, 2013

Experimental Methods to Study Human Postural Control
08:12

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Area of Science:

  • Biomechanics
  • Human posture analysis
  • Clinical measurement techniques

Background:

  • Assessing relaxed standing posture is crucial for clinical evaluation.
  • Existing methods may be costly or invasive.
  • A need exists for accessible, non-invasive posture measurement tools.

Purpose of the Study:

  • To describe the Posturegram technique for measuring relaxed standing postures.
  • To examine standing posture features in normal subjects using the Posturegram.
  • To identify potential indicators of asymmetry requiring clinical attention.

Main Methods:

  • The Posturegram technique utilizes photography for non-invasive recording of relaxed standing postures.
  • Landmark disposition in coronal and sagittal planes was analyzed in 42 healthy subjects.
  • Repeatability of landmark measurements was assessed over a one-week interval.

Main Results:

  • The Posturegram method proved inexpensive and suitable for clinical application.
  • Correlations between repeated landmark measurements were generally strong, with lower consistency in the pelvic and lower trunk regions.
  • Significant correlations among various postural tilts and deviations were observed.

Conclusions:

  • The Posturegram is a viable, cost-effective tool for assessing relaxed standing posture.
  • Postural analysis benefits from considering multiple variables collectively rather than in isolation.
  • Further investigation into group variable analysis may refine clinical interpretation of standing posture.