Ken Quarrie
kenquarrie.bsky.social
Ken Quarrie
@kenquarrie.bsky.social
Chief Scientist for NZ Rugby.

All posts are my own views, and do not necessarily align with the position of my employer on any issue discussed, unless I explicitly identify otherwise.

A mix of science and general observations. Posts ≠ endorsements
🧪 www.tandfonline.com/doi/full/10....

It is good to see more papers on female athletes being published. There is a significant deficit in knowledge about both performance issues and injury risks in many female sports, partly because so much of the research to date has been exclusively on males.
Epidemiology of injury and associated injury risk factors in South African provincial women rugby players
To establish match injury rates, characteristics, severity, burden, and associated risk factors in South African provincial women rugby players.A secondary data analysis of injury data collected pr...
www.tandfonline.com
October 28, 2025 at 6:22 PM
It seems that we are currently at a point where academics are using AI tools to write, or write large chunks of, research papers and grant applications, and reviewers are using AI to detect whether the authors used AI….
October 26, 2025 at 5:29 PM
Evaluating the Probability of Head Acceleration Events in Elite Men’s and Women’s Rugby Union Match-Play: The Impact of Tackle Height and Body Position - Sports Medicine
Background Head acceleration events (HAEs) are an increasing concern in collision sports owing to potential negative health outcomes. Objectives The objective of this study is to describe the probabilities of HAEs in tackles of differing heights and body positions in elite men’s and women’s rugby union. Methods Instrumented mouthguards (iMGs) were worn in men’s (n = 24 teams, 508 players, 782 observations) and women’s (n = 26 teams, 350 players, 1080 observations) rugby union matches. Tackle height (i.e. point of contact on ball-carrier) and body positions of tacklers and ball-carriers were labelled for all tackles in which a player wore an iMG. HAEs from the initial impact were identified. Mean player, tackler and ball-carrier exceedance probabilities for various peak linear and angular acceleration thresholds were estimated from ordinal mixed-effects models. Results Contact with ball-carriers’ head/neck resulted in the highest mean HAE probabilities for both sexes. The probability of an HAE to the ball-carrier decreased as tackle height lowered. The highest probability for the tackler was initial contact to the ball-carriers upper leg. Body position influenced the probability of HAEs, with falling/diving ball-carriers resulting in higher mean probabilities. When a player, regardless of role, was bent-at-waist, elevated HAE probabilities were observed in men’s competitions. Women’s data demonstrated similar probabilities of an HAE for all body positions. Conclusions Initial contact to the ball-carrier’s head/neck had the highest chance of an HAE, whilst role-specific differences are apparent for different tackle heights and body positions. Future player-welfare strategies targeting contact events should therefore consider HAE mechanisms along with current literature.
link.springer.com
October 11, 2025 at 8:13 PM
🧪 New paper on risk factors in rugby tackles – Hopkinson et al.

This is was a significant project for a doctorate – kudos to Mike for bringing it all together and for his diligence and attention to detail. It was a privilege to be able to contribute to it.
Impacting the rugby tackle: risk factors and mechanisms for concussion and musculoskeletal tackle-related injury — a systematic review and Delphi consensus to inform intervention strategies for risk r...
To (1) systematically review the literature to identify which match-related risk factors and mechanisms of rugby tackle events result in musculoskeletal injury, concussion, head injury assessments, an...
bjsm.bmj.com
October 11, 2025 at 8:41 AM
Iwasaki et al. (2024) 🧪

Results: Of the 58 injuries during one season, 70.7% were contact injuries. Collision counts and collision load were associated with the risk of injury. ORs were 4.20 [95% CI 1.74–10.11] and 4.44 (95% CI: 1.95–10.13), respectively.

www.frontiersin.org/journals/spo...
Frontiers | Relationship between the contact load and time-loss injuries in rugby union
Objective: Quantifying and managing the matches and training loads of players is important for injury prevention. As rugby union is a full-contact sport and ...
www.frontiersin.org
September 26, 2025 at 12:36 AM
In collaboration with researchers from the University of Auckland I have been working on a project aimed at increasing our understanding of the health effects of participating in high level rugby. The first paper from this project was published today 🧪
September 4, 2025 at 11:00 PM
pubmed.ncbi.nlm.nih.gov/40830034/?do...

Hopkinson et al. 2025. SR and Delphi consensus on risk factors and mechanisms for concussion and musculoskeletal injuries in rugby.
Impacting the rugby tackle: risk factors and mechanisms for concussion and musculoskeletal tackle-related injury - a systematic review and Delphi consensus to inform intervention strategies for risk r...
To (1) systematically review the literature to identify which match-related risk factors and mechanisms of rugby tackle events result in musculoskeletal injury, concussion, head injury assessments, an...
pubmed.ncbi.nlm.nih.gov
August 20, 2025 at 8:02 AM
Reposted by Ken Quarrie
Original Research 🔍

#RugbyLeague has one of the highest #concussion rates in #collisionsports. This study provides #SCAT5 values for men’s #NRL players and examines cultural or ethnic differences, supporting #inclusive, evidence-based assessment.
👀 zurl.co/60Eb7
August 16, 2025 at 9:00 AM
I enjoy watching both Sinner & Alcaraz — they are extraordinary.

Sinner reminds me of Agent Smith in the first of the Matrix movies — imperturbable, relentless, inevitable.

Alcaraz reminds me of Neo —unpredictable but incredibly creative and talented.

Both unbelievable talents.
July 14, 2025 at 1:52 AM
IMHO today was the day that Ryan Fox eclipsed his father in terms of New Zealand sporting legends!
June 9, 2025 at 7:12 AM
Reposted by Ken Quarrie
Writing a scientific paper or thesis? Over the years, I’ve gathered my favorite practical writing tips. I hope you find them helpful!

Check them out: dlwiki.nin.nl/Writing_and_...

#AcademicWriting #SciComm #WritingTips 🖊️🧪 🧠
Scientific writing tips
In scientific writing clarity is of utmost importance. Thoughts on writing, including figures, to get your results published - and reach your audience!
dlwiki.nin.nl
May 27, 2025 at 7:15 AM
Something suitable for a professor of mycology?
April 19, 2025 at 9:02 AM
Many people are familiar with the Latin phrase: “Caveat Emptor” - “let the buyer beware”.

Caveat lector - “let the reader beware” is increasingly important given the intentional efforts by state actors and multinational corporations to use misinformation and disinformation as propaganda tools.
April 13, 2025 at 10:25 PM
www.washingtonpost.com/health/2025/...

This is excellent news. Once they know the causes of autism they can develop vaccines for it! 🤪
RFK Jr. says we’ll know what causes autism by September. Is that realistic?
The Health and Human Services secretary said a conclusion would be in hand by September, setting off alarms. But he may have been mistaken on the date.
www.washingtonpost.com
April 12, 2025 at 12:58 AM
Reposted by Ken Quarrie
Always great to see a PhD student get his first paper out: doi.org/10.1016/j.au... How well to #EMedSky physicians refer mild and moderate traumatic brain injury patients to concussion services? #TBI
Redirecting
doi.org
April 9, 2025 at 9:10 PM
The glory of dawn in Te Whanganui-a-tara, Wellington, New Zealand, looking North Nor East
March 28, 2025 at 6:13 PM
I love the ephemerality of clouds. Also the child-like delight of pareidolia
March 27, 2025 at 6:50 PM
link.springer.com/article/10.1...

The print version of this article just turned up today. In it, we questioned the validity of strong claims made about causality between repeated head impacts and CTE pathology in a 2022 publication.

#Braininjury
#Alzheimers
🧪
Epidemiological Principles in Claims of Causality: An Enquiry into Repetitive Head Impacts (RHI) and Chronic Traumatic Encephalopathy (CTE) - Sports Medicine
Determining whether repetitive head impacts (RHI) cause the development of chronic traumatic encephalopathy (CTE)-neuropathological change (NC) and whether pathological changes cause clinical syndrome...
link.springer.com
March 27, 2025 at 6:07 PM
@pkpd-babe.bsky.social

Could you add me to the science feed you moderate please? Or if there is another that may be more appropriate feel free to direct me towards it:

scholar.google.com/citations?us...
Ken Quarrie
‪New Zealand Rugby‬ - ‪‪Cited by 6,077‬‬ - ‪rugby union‬ - ‪performance analysis‬ - ‪injury epidemiology‬ - ‪injury prevention‬
scholar.google.com
March 25, 2025 at 8:49 PM