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

Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

479
A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
479
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

435
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
435
Average Acceleration01:30

Average Acceleration

11.5K
The importance of understanding acceleration spans our day-to-day experiences, as well as the vast reaches of outer space and the tiny world of subatomic physics. In everyday conversation, to accelerate means to speed up. For instance, we are familiar with the acceleration of our car; the harder we apply our foot to the gas pedal, the faster we accelerate. The greater the acceleration, the greater the change in velocity over a given time. Acceleration is widely seen in experimental physics. In...
11.5K
Biasing of FET01:22

Biasing of FET

394
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
394
Impact01:30

Impact

269
Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
269
Measuring Acceleration Due to Gravity01:12

Measuring Acceleration Due to Gravity

840
Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
840

You might also read

Related Articles

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

Sort by
Same author

Lipid lowering in coronary artery disease - not just statins.

Clinical medicine (London, England)·2026
Same author

Head impact biomechanics across men's and women's contact sports: a comparative and clustering analysis.

Scientific reports·2025
Same author

Publisher Correction: On-field Head Acceleration Exposure Measurement Using Instrumented Mouthguards: Missing Data Imputation for Complete Exposure Analysis.

Annals of biomedical engineering·2025
Same author

Head Acceleration Events Sustained During High School Wrestling Matches: Grappling With Differences Between Male and Female Adolescents.

Journal of applied biomechanics·2025
Same author

On-field Head Acceleration Exposure Measurement Using Instrumented Mouthguards: Missing Data Imputation for Complete Exposure Analysis.

Annals of biomedical engineering·2025
Same author

Evaluation of suitable reference genes for gene expression studies in the developing mouse cortex using RT-qPCR.

BMC neuroscience·2025
Same journal

Patient-Specific Adaptation of a Mechano-Regulatory Bone-Healing Model Using Longitudinal Loading Data.

Annals of biomedical engineering·2026
Same journal

Effects of Simulated Body-Mass Reduction on Peak Knee Joint Loads During Daily Functional Activities.

Annals of biomedical engineering·2026
Same journal

Evaluating Different Optimization Criteria for Estimating Spine Loads and Muscle Activity During Manual Lifting With and Without Assistance from Back-Support Exoskeletons.

Annals of biomedical engineering·2026
Same journal

A Physiologic Left Ventricle Flow Phantom for 4D Flow MRI Applications and CFD Verification.

Annals of biomedical engineering·2026
Same journal

Pulsatile Hemodynamics of Prehypertension and Hypertension: Associations with Pressure and Sex.

Annals of biomedical engineering·2026
Same journal

A Pressure Difference-Based Strategy for Blood Oxygen Control in Membrane Oxygenators: Reduced Modeling, Computational Simulation, and Exploratory In Vivo Evaluation.

Annals of biomedical engineering·2026
See all related articles

Related Experiment Video

Updated: Oct 17, 2025

Data Acquisition Protocol for Determining Embedded Sensitivity Functions
07:46

Data Acquisition Protocol for Determining Embedded Sensitivity Functions

Published on: April 20, 2016

6.3K

Head Impact Sensor Triggering Bias Introduced by Linear Acceleration Thresholding.

Timothy Wang1, Rebecca Kenny2, Lyndia C Wu3

  • 1Department of Mechanical Engineering, The University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, BC, V6T 1Z4, Canada.

Annals of Biomedical Engineering
|October 8, 2021
PubMed
Summary
This summary is machine-generated.

Wearable head impact sensors may miss many mild head impacts in sports due to linear acceleration thresholding biases. This can lead to inaccurate head impact exposure measurements, affecting player safety research.

Keywords:
Head impact exposureHead impact sensorsImpact triggeringLinear acceleration thresholdSubconcussive impactsTriggering bias

More Related Videos

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
07:30

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact

Published on: September 21, 2017

9.1K
Modified Drop Tower Impact Tests for American Football Helmets
07:08

Modified Drop Tower Impact Tests for American Football Helmets

Published on: February 19, 2017

11.1K

Related Experiment Videos

Last Updated: Oct 17, 2025

Data Acquisition Protocol for Determining Embedded Sensitivity Functions
07:46

Data Acquisition Protocol for Determining Embedded Sensitivity Functions

Published on: April 20, 2016

6.3K
A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
07:30

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact

Published on: September 21, 2017

9.1K
Modified Drop Tower Impact Tests for American Football Helmets
07:08

Modified Drop Tower Impact Tests for American Football Helmets

Published on: February 19, 2017

11.1K

Area of Science:

  • Biomechanics
  • Sports Medicine
  • Wearable Technology

Background:

  • Contact sports players experience frequent head impacts, often mild (10-30 g peak linear acceleration).
  • Wearable head impact sensors are crucial for measuring head impact exposure.
  • Current sensors often rely on linear acceleration thresholds for impact detection.

Purpose of the Study:

  • To investigate triggering biases in wearable head impact sensors.
  • To evaluate the impact of sensor location and impact direction on detection accuracy.
  • To identify potential inaccuracies in head impact exposure measurements.

Main Methods:

  • Analytical investigation using American football and soccer impact data.
  • Simulated multi-directional impacts at typical mouthguard sensor locations.
  • Evaluated triggering based on per-axis and resultant acceleration thresholds.

Main Results:

  • A 10 g impact triggered detection in only 24.7% (per-axis) and 31.8% (resultant) of directions.
  • Anterior sensor locations showed lower trigger rates, with some 30 g impacts missed.
  • Triggering bias varied with sensor location and head kinematics.

Conclusions:

  • Linear acceleration thresholding introduces significant bias in head impact detection.
  • This bias can lead to underestimation of head impact exposure in athletes.
  • Recommendations are proposed for sensor manufacturers and researchers to mitigate bias.