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Related Concept Videos

Types of Impact01:30

Types of Impact

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Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...
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Impact01:30

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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.
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Related Experiment Video

Updated: Mar 19, 2026

In Vivo Protocol of Controlled Subconcussive Head Impacts for the Validation of Field Study Data
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Quantifying Head Impacts in Collegiate Lacrosse.

Bryson B Reynolds1, James Patrie1, Erich J Henry1

  • 1University of Virginia, Charlottesville, Virginia, USA.

The American Journal of Sports Medicine
|June 10, 2016
PubMed
Summary
This summary is machine-generated.

Lacrosse players experience more head impacts during games than practices, with men sustaining more severe impacts. This research quantifies head impact burden in collegiate lacrosse.

Keywords:
biomechanicsfemale sportshead injuries/concussionlacrossesubconcussion

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Area of Science:

  • Sports Medicine
  • Biomechanics
  • Epidemiology

Background:

  • Repetitive head impacts in sports like lacrosse raise clinical and scientific concerns.
  • The head impact burden in lacrosse, a rapidly growing sport, remains largely unknown.

Purpose of the Study:

  • To quantify head impacts during collegiate lacrosse practices and games using wearable accelerometers.
  • To assess the frequency and severity of head impacts in male and female lacrosse players.

Main Methods:

  • A descriptive epidemiology study involving 14 women's and 15 men's collegiate lacrosse players.
  • Wearable mastoid-patch accelerometers were used to record head impacts over one year.
  • Analysis included average impact severity, mean number of impacts, and cumulative acceleration, stratified by sex and event type.

Main Results:

  • Head impacts were more frequent during games than practices for both sexes.
  • Men's lacrosse players experienced significantly higher average head acceleration per impact during games compared to women.
  • Impact severity did not significantly differ between games and practices, but quantity did.

Conclusions:

  • Game play in lacrosse involves a higher quantity of head impacts compared to practices.
  • Sex differences in head impact burden are primarily due to impact severity in men.
  • Further research with larger cohorts and diverse age groups is recommended to inform safety regulations.