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Related Concept Videos

Stability01:28

Stability

The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
Stability of structures01:14

Stability of structures

In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
Stability of Equilibrium Configuration01:23

Stability of Equilibrium Configuration

Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
Pole and System Stability01:24

Pole and System Stability

The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's response.
Survival Tree01:19

Survival Tree

Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
 Building a Survival Tree
Constructing a survival tree begins...
Microtubule Instability02:17

Microtubule Instability

Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated assembly and...

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Related Experiment Video

Updated: Jun 16, 2026

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
07:52

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Published on: September 18, 2020

What I always wanted to know about instability training.

Jonathon R Fowles1

  • 1School of Recreation Management and Kinesiology, Acadia University, Wolfville, NS B4P 1S9, Canada. jonathon.fowles@acadiau.ca

Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition Et Metabolisme
|February 5, 2010
PubMed
Summary

Instability training can boost core muscle activation but may reduce power output. It

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Rehabilitation Medicine

Background:

  • Instability training is a popular method for core musculature development.
  • While it can increase core muscle activation, its overall effectiveness is debated.
  • Previous literature reviews highlight potential drawbacks, such as reduced muscular power output.

Purpose of the Study:

  • To critically evaluate the evidence surrounding instability training for core musculature.
  • To determine the efficacy of instability training in various contexts, including athletic performance and rehabilitation.
  • To provide evidence-based recommendations for the application of instability training.

Main Methods:

  • Extensive literature review of studies on instability training and core musculature.

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A Modified Lean and Release Technique to Emphasize Response Inhibition and Action Selection in Reactive Balance

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Last Updated: Jun 16, 2026

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
07:52

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Published on: September 18, 2020

An Instrumented Pull Test to Characterize Postural Responses
12:18

An Instrumented Pull Test to Characterize Postural Responses

Published on: April 6, 2019

A Modified Lean and Release Technique to Emphasize Response Inhibition and Action Selection in Reactive Balance
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  • Analysis of research examining the effects of instability on muscle activation and power output.
  • Synthesis of findings to inform position stands and recommendations.

    • Main Results:

    • Instability training can enhance core muscle activation.
    • However, it may lead to a decrease in overall muscular power output.
    • This reduction in power output has implications for training goals focused on maximizing muscle stress or athletic performance.

    Conclusions:

    • Instability training can be a valuable component of periodized athletic programs.
    • It may be beneficial in rehabilitation settings, particularly for low back pain recovery.
    • Further research is needed to explore its role in injury prevention, sports performance enhancement, and broader clinical applications.