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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
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Wearing a crotch strap on a correctly fitted lifejacket improves lifejacket performance.
1a Extreme Environments Laboratory, Department of Sport and Exercise Science , University of Portsmouth , Spinnaker Building, Cambridge Road, Portsmouth PO1 2ER , UK.
Ergonomics
|May 3, 2014
Summary
Wearing a lifejacket with a crotch strap significantly improves airway protection. This retention system enhances lifejacket stability, reducing drowning risk during water immersion and wave exposure.
Area of Science:
- Marine safety
- Biomechanical engineering
- Drowning prevention
Background:
- Lifejackets are crucial for flotation and airway protection during water immersion.
- Retention systems, such as crotch straps, may enhance lifejacket performance by improving torso fit.
- Accidental immersion and wave exposure can compromise lifejacket effectiveness.
Purpose of the Study:
- To evaluate the impact of a crotch strap on lifejacket performance regarding airway protection.
- To quantify the improvement in airway freeboard with and without a crotch strap.
- To assess the effect of a crotch strap on drowning risk during simulated wave exposure.
Main Methods:
- Study one: Human immersion test (n=10) measuring airway freeboard with a lifejacket, with and without a crotch strap (two tightness levels), after a step into water from height.
- Study two: Manikin immersion test simulating 3-hour wave exposure to assess lifejacket performance with and without a crotch strap.
Main Results:
- Wearing a crotch strap significantly improved airway freeboard compared to not wearing one (P < 0.05).
- The time to aspirate a lethal dose of seawater was doubled when using a crotch strap during wave exposure (P < 0.001).
Conclusions:
- A crotch strap functions as an effective retention system for lifejackets.
- Incorporating a crotch strap on a correctly fitted lifejacket enhances airway protection for wearers.
- Crotch straps are recommended for improved safety during accidental water immersion and prolonged wave exposure.
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