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Child posture and shoulder belt fit during extended night-time traveling: an in-transit observational study
Jason L Forman1, Maria Segui-Gomez, Joseph H Ash
1European Center for Injury Prevention, Universidad de Navarra University of Virginia, Center for Applied Biomechanics.
Insights
High-back booster seats significantly improve shoulder belt fit and reduce head movement in sleeping children during car travel. This enhances child passenger safety by minimizing injury risk factors.
Area of Science:
- Pediatric safety research
- Biomechanics of injury prevention
- Automotive occupant safety
Background:
- Understanding pediatric occupant postures is crucial for identifying injury risk factors.
- Child passenger safety relies on proper restraint and positioning during travel.
- Assessing sleeping postures in vehicles is key to preventing injuries.
Purpose of the Study:
- To observe lateral head positions and shoulder belt fit in children aged 7-14 during simulated night travel.
- To evaluate the effectiveness of different booster seat types (high-back, low-back, none) on occupant posture and belt fit.
- To identify how sleeping postures in vehicles affect injury risk factors.
Main Methods:
- An observational, in-transit study involving 30 pediatric passengers (ages 7-14) using three-point seatbelts.
- Subjects were divided into three groups: high-back booster, low-back booster, and no booster seat.
- Video analysis of lateral head motion and shoulder belt fit was conducted, with one frame analyzed per minute of travel.
Main Results:
- The high-back booster group showed a statistically significant decrease in poor shoulder belt fit compared to other groups.
- High-back boosters also led to significant reductions in lateral head motion.
- Low-back boosters did not significantly improve shoulder belt fit or reduce head motion compared to no booster.
Conclusions:
- High-back booster seats effectively support the head during sleep, reducing motion and improving shoulder belt fit.
- These findings suggest high-back boosters can mitigate injury risks associated with sleeping child occupants.
- Further research should investigate lap belt fit and the impact on predicted injury risk.
Abstract:
Understanding pediatric occupant postures can help researchers indentify injury risk factors, and provide information for prospective injury prediction. This study sought to observe lateral head positions and shoulder belt fit among older child automobile occupants during a scenario likely to result in sleeping - extended travel during the night. An observational, volunteer, in-transit study was performed with 30 pediatric rear-seat passengers, ages 7 to 14. Each was restrained by a three-point seatbelt and was driven for seventy-five minutes at night. Ten subjects used a high-back booster seat, ten used a low-back booster seat, and ten used none (based on the subject height and weight). The subjects were recorded with a low-light video camera, and one frame was analyzed per each minute of video. The high-back booster group exhibited a statistically significant (p<0.05) decrease in the mean frequency of poor shoulder belt fit compared to the no-booster and low-back booster groups. The high-back booster group also exhibited statistically significant decreases in the 90(th) percentile of the absolute value of the relative lateral motion of the head. The low-back booster group did not result in statistically significant decreases in poor shoulder belt fit or lateral head motion compared to the no-booster group. These results are consistent with the presence of large lateral supports of the high-back booster which provided support to the head while sleeping, reducing voluntary lateral occupant motion and improving shoulder belt fit. Future work includes examining lap belt fit in-transit, and examining the effects of these observations on predicted injury risk.
