Helmet Fit Retention
Helmet Fit Retention - Related Videos
07:30
A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
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Cited by 8 •
2017
Using an anthropometric head and neck, optical fiber-based fit force transducers, an array of head acceleration and neck force/moment transducers, and a dual high speed camera system, we present a test bed to study helmet retention and effects on biomechanical measures of head and neck injury secondary to head impact.
01:58
Studying the Permeation of FITC and FITC-Ferritin through an In Vitro Blood-Brain Barrier Model
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2025
This video demonstrates a method to study permeation through an in vitro blood-brain barrier (BBB) model using astrocytes and endothelial cells on a membrane insert, with free FITC and FITC-loaded ferritin. FITC-ferritin bound to receptors on endothelial cells and crossed the membrane barrier to the lower chamber while free FITC showed restricted permeation and remained in the upper chamber.
02:56
FITC-Dextran Feeding: A Method to Quantify Intestinal Permeability in C. elegans
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2023
This video introduces a method of to visualize and measure the integrity of the C. elegans intestine lumen by feeding worms FITC-labeled dextran. The example protocol shows the assay done with 3,3’-diindolylmethane (DIM)-treated and pathogen-fed worms.
02:42
Determination of the Calcium Retention Capacity of Isolated Mitochondria
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2025
This video demonstrates the procedure to assess mitochondrial calcium retention capacity by monitoring real-time changes in fluorescence as mitochondria uptake calcium. This assay is useful for studying mitochondrial function and calcium-related processes, including apoptosis and neurodegenerative diseases.
03:10
Soil Core Sample Collection for Water Retention Property Analysis
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2026
Source:Alessia J. Marchesan1, Guillermo Hernandez Ramirez11Renewable Resources, University of Alberta. This video demonstrates the technique for collecting a soil sample for hydraulic property analysis. The sampling area is cleared, and the top crust is evacuated. The sampling ring is then placed into the soil to collect the sample. The ring with the sample is then cleaned, labeled, packed, and transferred undisturbed for analysis.
FAQs
Retention performance depends on how these components maintain contact between the helmet and the head. Straps help secure the helmet, padding supports contact and fit, and adjustable components allow the fit to be adapted. Together, they can limit unwanted helmet motion and distribute applied forces more consistently during movement, loading, or impact.
Movement, loading, and impact can challenge helmet positioning in different ways. A helmet may appear stable during ordinary motion yet show slippage, pressure points, or inadequate coverage under applied forces. Evaluating these conditions helps bioengineers identify weaknesses that would not be apparent from fit assessment alone and connect retention performance with protective design.
A retention system must maintain contact with the head without creating problematic pressure points. Fit testing can reveal whether straps, padding, and adjustable components hold the helmet securely while remaining suitably comfortable. This balance matters because improved stability and reduced discomfort can support more effective helmet designs for repeated use across different settings.
Researchers can combine fit testing, motion tracking, and impact experiments to examine helmet behavior. Fit testing assesses how the helmet sits on the head, motion tracking documents movement or slippage, and impact experiments examine positioning under applied forces. Using these approaches together provides a broader assessment than relying on a single test condition.
Retention testing can identify helmet slippage, localized pressure points, and inadequate coverage. These findings show whether the helmet remains appropriately positioned and whether its contact with the head is distributed as intended. The results can then guide changes to straps, padding, or adjustable fit components and help researchers compare alternative protective equipment designs.
The topic is relevant to helmet design for sports, occupational, and medical applications, where secure positioning and user comfort may affect performance. Testing outcomes can inform safer designs, improve stability, and contribute to performance standards. Bioengineering studies therefore connect physical fit behavior with practical requirements for different helmet-use environments.