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

Energy Budgets00:51

Energy Budgets

10.7K
Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
10.7K
What is Energy?04:10

What is Energy?

58.5K
The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate from the Sun — the ultimate energy source. Plants capture light energy from the Sun, and, via the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal (fossilized...
58.5K
Free Energy01:21

Free Energy

51.8K
Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break...
51.8K
Energy Basics02:27

Energy Basics

47.3K
Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter.
47.3K
Free Energy Changes for Nonstandard States03:25

Free Energy Changes for Nonstandard States

13.4K
The free energy change for a process taking place with reactants and products present under nonstandard conditions (pressures other than 1 bar; concentrations other than 1 M) is related to the standard free energy change according to this equation:
13.4K
Potential Energy00:52

Potential Energy

42.4K
The energy stored by a structure and location of matter in space is called potential energy. For instance, raising a kettlebell changes its spatial location and increases its potential energy. Similarly, a stretched rubber band contains potential energy which, under certain conditions, can be converted into other forms of energy, such as kinetic energy.
Chemical bonds that form attractive forces between atoms also contain potential energy, called chemical energy. When a chemical reaction...
42.4K

You might also read

Related Articles

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

Sort by
Same author

Fatigue-Induced Neuromuscular Responses Differ Between Endurance- and Strength-Trained Males.

European journal of sport science·2026
Same author

Understanding the Effects of Conductive Polymer Electrode Coating on Recorded Neural Signals.

Advanced healthcare materials·2026
Same author

Entrainment of Motoneuron Firing by Deep Brain Stimulation.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference·2025
Same author

Microneedle electrodes for electromyography.

Biosensors & bioelectronics·2025
Same author

Estimation of Gait Parameters in Huntington's Disease Using Wearable Sensors in the Clinic and Free-living Conditions.

IEEE transactions on neural systems and rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society·2024
Same author

Language-Independent Acoustic Biomarkers for Quantifying Speech Impairment in Huntington's Disease.

American journal of speech-language pathology·2024

Related Experiment Video

Updated: Jan 24, 2026

Substantiating Appropriate Motion Capture Techniques for the Assessment of Nordic Walking Gait and Posture in Older Adults
09:37

Substantiating Appropriate Motion Capture Techniques for the Assessment of Nordic Walking Gait and Posture in Older Adults

Published on: May 12, 2016

9.2K

Gait Event Detection From Accelerometry Using the Teager-Kaiser Energy Operator.

Matthew William Flood, Ben P F O'Callaghan, Madeleine M Lowery

    IEEE Transactions on Bio-Medical Engineering
    |June 1, 2019
    PubMed
    Summary

    A new method using the Teager-Kaiser Energy Operator accurately estimates gait events like initial and final contact from accelerometry. This novel approach outperforms existing methods across various walking conditions.

    More Related Videos

    Clinical-oriented Three-dimensional Gait Analysis Method for Evaluating Gait Disorder
    06:54

    Clinical-oriented Three-dimensional Gait Analysis Method for Evaluating Gait Disorder

    Published on: March 4, 2018

    14.7K
    Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis
    07:44

    Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis

    Published on: March 23, 2019

    18.8K

    Related Experiment Videos

    Last Updated: Jan 24, 2026

    Substantiating Appropriate Motion Capture Techniques for the Assessment of Nordic Walking Gait and Posture in Older Adults
    09:37

    Substantiating Appropriate Motion Capture Techniques for the Assessment of Nordic Walking Gait and Posture in Older Adults

    Published on: May 12, 2016

    9.2K
    Clinical-oriented Three-dimensional Gait Analysis Method for Evaluating Gait Disorder
    06:54

    Clinical-oriented Three-dimensional Gait Analysis Method for Evaluating Gait Disorder

    Published on: March 4, 2018

    14.7K
    Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis
    07:44

    Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis

    Published on: March 23, 2019

    18.8K

    Area of Science:

    • Biomechanics and Wearable Technology
    • Signal Processing for Health Monitoring
    • Gait Analysis and Rehabilitation

    Background:

    • Accurate detection of gait events is crucial for analyzing human locomotion and for developing effective rehabilitation strategies.
    • Existing gait event detection (GED) methods often struggle with accuracy across diverse real-world walking conditions.
    • Wearable accelerometers offer a promising, non-invasive solution for unobtrusive gait monitoring.

    Purpose of the Study:

    • To introduce a novel method for estimating initial contact (IC) and final contact (FC) using the Teager-Kaiser Energy Operator (TKEO) applied to accelerometry data.
    • To evaluate the performance of the TKEO-based method against established GED algorithms under various walking scenarios.
    • To assess the accuracy and reliability of the proposed TKEO method for automated gait event detection.

    Main Methods:

    • A symmetric discrete approximation of the Teager-Kaiser Energy Operator was applied to shank acceleration signals.
    • Gait events were captured during flat treadmill, inclined treadmill, and indoor walking conditions.
    • Performance was benchmarked against four existing GED methods using force-sensitive resistors as ground truth, analyzing mean-absolute error, sensitivity, precision, and F1-score.

    Main Results:

    • The TKEO method achieved high accuracy for both IC (F1-score >0.98) and FC (F1-score >0.9) detection across all tested conditions.
    • The proposed method demonstrated lower mean-absolute errors (IC: <0.018s, FC: <0.039s) compared to other examined methods.
    • Shank-based methods using TKEO showed superior performance and more consistent gait event distributions than waist-based methods.

    Conclusions:

    • The Teager-Kaiser Energy Operator provides a highly accurate and robust approach for automated gait event detection.
    • The proposed TKEO-based method is more accurate for final contact detection than existing algorithms.
    • This technique shows significant potential for reliable gait analysis in diverse real-world environments.