Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Stability of structures01:14

Stability of structures

598
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,...
598
Pole and System Stability01:24

Pole and System Stability

1.2K
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...
1.2K
Applications of Stress01:04

Applications of Stress

760
Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
760
Method of Joints: Problem Solving I01:30

Method of Joints: Problem Solving I

1.9K
The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint. Consider a truss structure with two forces of 20 N and 10 N acting at joints C and D, respectively. The method of joints can be used to determine the forces FCB, FDC,...
1.9K
Survival Tree01:19

Survival Tree

468
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...
468
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

1.5K
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
1.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

The effect of repeated shocks on the low back during horse riding.

Journal of biomechanics·2025
Same author

Beyond gait speed: exploring the added value of Inertial Measurement Unit-based measurements of gait in the estimation of the walking ability in daily life.

BMC neurology·2024
Same author

Corrigendum to "Constant force muscle stretching induces greater acute deformations and changes in passive mechanical properties compared to constant length stretching" [J. Biomech. 154 (2023) 111594].

Journal of biomechanics·2024
Same author

Exposure to inclined trunk postures in surgical staff.

Journal of biomechanics·2023
Same author

The effect of back muscle fatigue on EMG and kinematics based estimation of low-back loads and active moments during manual lifting tasks.

Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology·2023
Same author

Constant force muscle stretching induces greater acute deformations and changes in passive mechanical properties compared to constant length stretching.

Journal of biomechanics·2023

Related Experiment Video

Updated: Mar 28, 2026

Method to Measure Tone of Axial and Proximal Muscle
10:41

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

18.1K

Trunk stabilization estimated using pseudorandom force perturbations, a reliability study.

M Griffioen1, E Maaswinkel2, W W A Zuurmond3

  • 1MOVE Research Institute Amsterdam, Faculty of Human Movement Sciences, VU University Amsterdam, De Boelelaan 1105, 1081 HV Amsterdam, The Netherlands; Department of Anesthesiology, VU University Medical Center Amsterdam, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands.

Journal of Biomechanics
|December 29, 2015
PubMed
Summary

This study assessed the reliability of a new method measuring trunk stabilization quality. Results show the method is reliable for both healthy individuals and low-back pain patients, supporting its use in future research.

Keywords:
Intrinsic stiffnessLow back painLumbar spineReflexesSystem identification

More Related Videos

Experimental Methods to Study Human Postural Control
08:12

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

10.2K
An Instrumented Pull Test to Characterize Postural Responses
12:18

An Instrumented Pull Test to Characterize Postural Responses

Published on: April 6, 2019

11.6K

Related Experiment Videos

Last Updated: Mar 28, 2026

Method to Measure Tone of Axial and Proximal Muscle
10:41

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

18.1K
Experimental Methods to Study Human Postural Control
08:12

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

10.2K
An Instrumented Pull Test to Characterize Postural Responses
12:18

An Instrumented Pull Test to Characterize Postural Responses

Published on: April 6, 2019

11.6K

Area of Science:

  • Biomechanics
  • Neuromuscular Control
  • Rehabilitation Science

Background:

  • Trunk stabilization quality is crucial for understanding low-back pain (LBP) development and persistence.
  • A novel method quantifies trunk stabilization using frequency response functions (FRFs) of thorax movement and trunk extensor EMG.
  • The between-day reliability of this trunk stabilization measurement method was previously unestablished.

Purpose of the Study:

  • To determine the between-day reliability of trunk frequency response functions (FRFs) in healthy subjects.
  • To assess the between-day reliability of trunk FRFs in patients experiencing low-back pain (LBP).
  • To validate a method for quantifying trunk stabilization quality for LBP research.

Main Methods:

  • Utilized a linear actuator to apply perturbations to the trunk.
  • Measured thorax movement and trunk extensor electromyography (EMG).
  • Calculated frequency response functions (FRFs) to quantify admittance and reflex gains.
  • Assessed test-retest reliability using intraclass correlation coefficients (ICCs) over two days.

Main Results:

  • In LBP patients, substantial reliability was found for both admittance and reflex gains (ICC3,1 > 0.67).
  • Healthy subjects demonstrated substantial reliability for admittance gain (ICC3,1 = 0.66).
  • Moderate reliability was observed for reflexive gain in healthy subjects (ICC3,1 = 0.44).

Conclusions:

  • The developed method for measuring trunk stabilization quality demonstrates reliable test-retest values in both healthy individuals and LBP patients.
  • Despite limitations in sample size, the findings indicate the method's promise for future investigations into low-back pain.
  • This reliable measurement of trunk stabilization is a significant advancement for LBP research and clinical application.