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

Social Facilitation01:04

Social Facilitation

Not all intergroup interactions lead to negative outcomes. Sometimes, being in a group situation can improve performance. Social facilitation occurs when an individual performs better when an audience is watching than when the individual performs the behavior alone. This typically occurs when people are performing a task for which they are skilled.
Force and Momentum01:17

Force and Momentum

Force and momentum are intimately related. Force acting over time can change momentum, and Newton's second law of motion can be stated in its most broadly applicable form in terms of momentum. Momentum can be applied to systems where the mass is changing, such as rockets, as well as to systems of constant mass. Also, momentum continues to be a key concept in the study of atomic and subatomic particles in quantum mechanics. One can consider systems with varying mass in some detail; however, the...
Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...

You might also read

Related Articles

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

Sort by
Same author

Head Acceleration Event Exposure during Pre-Season Training in Elite Men's Rugby Union.

Sports medicine - open·2026
Same author

What are healthcare practitioners' perspectives and experiences of strength assessment and strength training practices in community pulmonary rehabilitation? A qualitative study from the UK.

BMJ open·2026
Same author

Metabolic state determines the brain and direct islet effects of liraglutide on enhanced insulin secretion.

Diabetologia·2026
Same author

The Dark Tetrad and academic dishonesty: a systematic review and narrative synthesis of personality predictors of cheating, plagiarism, and deception in education.

BMC psychology·2026
Same author

Serum proteomic atlas reveals distinct molecular signatures of lupus nephritis activity, chronicity, and treatment response.

bioRxiv : the preprint server for biology·2026
Same author

The impact of calorific screening thresholds and weight status when validating UK supermarket transaction records in dietary evaluation: FIO-STRIDE.

International journal of obesity (2005)·2026

Related Experiment Video

Updated: May 13, 2026

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

11.4K

The Effect of Changing Weekly Contact Training Duration Beyond Current Guidelines on Head Acceleration Events in

Thomas Sawczuk1,2, Greg Roe3, James Tooby3

  • 1Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK. t.sawczuk@leedsbeckett.ac.uk.

Sports Medicine (Auckland, N.Z.)
|November 26, 2025
PubMed
Summary

Reducing contact training in rugby union decreased head acceleration events (HAEs) slightly, with non-contact drills showing proportional reductions. Managing high-exposure players may be more effective than broad training guideline changes.

More Related Videos

In Vivo Protocol of Controlled Subconcussive Head Impacts for the Validation of Field Study Data
06:14

In Vivo Protocol of Controlled Subconcussive Head Impacts for the Validation of Field Study Data

Published on: April 18, 2019

6.8K
Objectively Assessing Sports Concussion Utilizing Visual Evoked Potentials
12:11

Objectively Assessing Sports Concussion Utilizing Visual Evoked Potentials

Published on: April 27, 2021

3.8K

Related Experiment Videos

Last Updated: May 13, 2026

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

11.4K
In Vivo Protocol of Controlled Subconcussive Head Impacts for the Validation of Field Study Data
06:14

In Vivo Protocol of Controlled Subconcussive Head Impacts for the Validation of Field Study Data

Published on: April 18, 2019

6.8K
Objectively Assessing Sports Concussion Utilizing Visual Evoked Potentials
12:11

Objectively Assessing Sports Concussion Utilizing Visual Evoked Potentials

Published on: April 27, 2021

3.8K

Area of Science:

  • Sports Medicine
  • Biomechanics
  • Rugby Union Research

Background:

  • Investigated the impact of reduced contact training duration on head acceleration event (HAE) exposure in professional rugby union.
  • Focused on both men's and women's competitions to assess sex-specific effects.

Purpose of the Study:

  • To simulate and quantify the effect of decreasing contact training time on in-season HAE exposure.
  • To evaluate different strategies for reducing player exposure to head impacts.

Main Methods:

  • Utilized instrumented mouthguards to collect HAE data from 982 players across two seasons.
  • Employed generalized linear mixed models to analyze HAEs per position, sex, and contact type.
  • Simulated scenarios included 25-75% reductions in contact load and replacement of full contact with controlled or non-contact training.

Main Results:

  • All simulated scenarios reduced head acceleration events (HAEs), with a maximum weekly decrease of 3.2 events.
  • Reductions in HAEs were often disproportionately smaller than the decrease in contact training duration.
  • Replacing full contact with non-contact training showed proportional decreases in HAEs relative to reduced training time.

Conclusions:

  • While reducing contact training lowers HAEs, the overall reduction is modest due to low training HAE rates.
  • Strategies focusing on managing individual high-exposure players may be more impactful than solely reducing contact training guidelines.
  • Policymakers must consider the trade-offs associated with modifying contact training protocols.