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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,...
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.
Reliability and Validity01:29

Reliability and Validity

Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.
Exercise Stress Test01:26

Exercise Stress Test

Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it to...

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Related Experiment Video

Updated: Jul 4, 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

Development and reliability of two core stability field tests.

Patrick M Cowley1, Thomas C Swensen

  • 1Department of Exercise and Sport Sciences, Ithaca College, Ithaca, New York, USA. pmcowley@syr.edu

Journal of Strength and Conditioning Research
|June 14, 2008
PubMed
Summary

New front and side abdominal power tests (FAPT and SAPT) reliably assess core stability power in young women. These tests can help identify athletes at risk of injury, using medicine ball throws to measure explosive core strength.

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Evaluating the Function of the Foot Core System in the Elderly
08:25

Evaluating the Function of the Foot Core System in the Elderly

Published on: March 11, 2022

Related Experiment Videos

Last Updated: Jul 4, 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

Evaluating the Function of the Foot Core System in the Elderly
08:25

Evaluating the Function of the Foot Core System in the Elderly

Published on: March 11, 2022

Area of Science:

  • Sports Medicine
  • Biomechanics
  • Exercise Physiology

Background:

  • Core stability is crucial for preventing back and lower extremity injuries in athletes.
  • Existing field tests may not adequately assess the strength and power aspects of core stability.
  • Objective assessment tools are needed to identify athletes susceptible to core-related injuries.

Purpose of the Study:

  • To develop and evaluate the reliability of new field tests for assessing core power.
  • To introduce the front and side abdominal power tests (FAPT and SAPT) for athletic assessment.
  • To determine if FAPT and SAPT are reliable measures for the power component of core stability.

Main Methods:

  • Adapted plyometric medicine ball exercises to create the FAPT and SAPT.
  • Participants explosively contracted core muscles to project a medicine ball.
  • Twenty-four untrained young women completed three trials of each test over nonconsecutive days.

Main Results:

  • Both FAPT and SAPT demonstrated excellent test-retest reliability (ICC > 0.93).
  • Acceptable measurement error was observed for both tests.
  • No significant learning effect was detected between testing sessions.

Conclusions:

  • The FAPT and SAPT are reliable and valid field tests for assessing core power.
  • These tests can be utilized to measure the power component of core stability in young women.
  • Findings support the use of FAPT and SAPT for identifying athletes at risk of injury.