Commotio cordis: what the bodies and studies say, and which rules require ND200.

What the bodies say it is

NOCSAE, a standards body for athletic equipment, describes commotio cordis as a life-threatening sports injury that can happen when a player is struck in the chest, for example by a lacrosse ball or stick, causing a sudden cardiac crisis, and says it can affect athletes of any age. USA Lacrosse, in November 2021, described it as a disruption of heart rhythm caused by a blow to the chest: rare, but one of the leading causes of sudden cardiac death in athletes. It added that the impact need not be especially hard or fast.

NOCSAE states that 15 to 25 athletes across all sports die of commotio cordis each year, most of them under 18. NOCSAE gives this as its own estimate without citing a source, so it is not a registry count. World Lacrosse repeated the same range when it adopted its equipment standards on 12 May 2026. NOCSAE calls protective equipment the first line of defence and automated external defibrillators the second; this page does not describe emergency response.

USA Lacrosse's health and safety page lists commotio cordis guidelines dated June 2023 and a 2022 fact sheet on commotio cordis and NOCSAE equipment. Their contents were not read for this site.

What the medical studies found

Maron and colleagues, Pediatrics, 2009

This study reviewed the US Sudden Death in Young Athletes Registry for 1980 to 2008 and found 23 sudden deaths or cardiac arrests among high school and college lacrosse players, all male, with an average age of 18. Ten followed a blunt blow to the chest (commotio cordis), and four of those ten were goalkeepers wearing commercially available chest protectors. Twelve others collapsed from presumed or documented heart disease. Those two groups add to 22, and the abstract summary used here does not explain the remaining case.

The study gave an overall sudden death rate in lacrosse of 1.46 per 100,000 person-years, similar to baseball, basketball, football and hockey, and a commotio cordis death rate of 0.63 per 100,000 person-years, higher than in other sports except hockey. The authors concluded that sudden death in competitive lacrosse is rare and no more common than in most other sports, but that commotio cordis caused a disproportionate share, and that some victims had been wearing chest barriers, which in their view showed the need for effective chest protection.

Two readings of the same study differ. The abstract counts deaths and cardiac arrests together as 23. A HealthDay news report, seen only in a search summary, gave 19 deaths among the 23 cases.

Peng and colleagues, Sports Medicine, 2023

This review says the US National Commotio Cordis Registry was set up in 1995 and held 216 cases as of July 2012, with no later counts publicly available. About 95 percent of registry cases were male, the mean age was 15, and more than 75 percent happened during sport. Baseball was the most common sport (51 percent of cases) and softball 11 percent; the review gives no lacrosse count. It reports that recorded survival rose from about 15 percent in the registry's 2002 report to 58 percent in its 2013 update. It also states that registry studies and animal models have not shown chest barriers to prevent the arrhythmia, and that reporting of sudden cardiac death in athletes is neither standardised nor mandatory.

Counts that do not match

A USA Lacrosse article of January 2017 said seven lacrosse players had died of commotio cordis since 1983, without naming a source. The 2009 study counted ten commotio cordis deaths in high school and college lacrosse from 1980 to 2008. The periods and populations differ, so neither figure is the total, and they should not be added. A later study by Moseley and colleagues counted commotio cordis among all catastrophic events in US lacrosse from 1982 to 2020 using a third method; it is on deaths as published.

The ND200 standard

NOCSAE's ND200 is titled "Standard Test Method and Performance Specification Used in Evaluating the Performance Characteristics of Protectors for Commotio Cordis". Its dates, as NOCSAE and others give them:

• January 2016. NOCSAE introduced a proposed chest protector standard for commotio cordis, open for public comment until January 2017, covering baseball and lacrosse because catchers and goalkeepers are typically most exposed (NOCSAE, 15 June 2016).
• 27 January 2017. NOCSAE's standards committee voted to finalise what it called the first chest protector standard for commotio cordis, for baseball and lacrosse, to take effect in January 2018. NOCSAE says the research behind it was done with the Louis J. Acompora Memorial Foundation and, per NOCSAE, USA Lacrosse; USA Lacrosse Magazine credits the research and testing to work led by cardiac electrophysiologist Dr Mark Link.
• July 2021. NOCSAE set an effective date for the ND200-21 revision; products certified to ND200-19 could still be sold afterwards but no longer made. The date itself is given two ways: 31 January 2023 in the National Sporting Goods Association's report of the meeting, and 1 February 2023 on NOCSAE's own document page.
• December 2025. NOCSAE's document page lists a modification, ND200-22m25, which the document marks as editorial. No separate effective date for it was found.

Under the current text, protectors are struck on the NOCSAE Thoracic Surrogate with a baseball or lacrosse ball, as the maker designates, at 30 mph and 50 mph, and the peak force at the cardiac load cell may not exceed set limits. The standard is pass or fail; NOCSAE says it does not rank products and regards claims that one certified product protects more than another as unsupported by independent research. Certified protectors must carry a warning that no protector can prevent all cardiac or other injury. The full test and labelling detail, and a disagreement over whether pass/fail levels changed between versions, are on chest protectors and ND200.

What the standard is said to do, and not do

• NOCSAE says the standard is intended to significantly reduce the likelihood of commotio cordis, not that it prevents every case.
• Dr Mark Link, reported by USA Lacrosse in January 2017, said that in tests on a mechanical surrogate more than half of unprotected impacts caused ventricular fibrillation, and that 4 of 12 protectors tested then cut that rate to 20 percent or less.
• Peng and colleagues (2023) state that registry studies and animal models have not shown chest barriers to prevent the arrhythmia.
• Maron and colleagues (2009) recorded goalkeepers who died while wearing the chest protectors then on sale, before ND200 existed.

No source here says a chest protector or shoulder pad prevents commotio cordis. Whether a given product is certified is decided by the standard and shown by its marks, which officials and governing bodies check.

Who requires ND200, and from when

USA Lacrosse Magazine reported in March 2019 that USA Lacrosse approved the goalkeeper requirement in autumn 2018 and wrote it into its 2019 rule books, delaying enforcement to 2021 to give makers time. USA Lacrosse's health and safety page, read on 23 October 2026, still states the goalkeeper requirement and the boys' field-player requirement since 2022; the 2026 rule books themselves were not read. USA Lacrosse says it was the first governing body to mandate ND200, and that compliant chest protectors and shoulder pads must carry the NOCSAE lacrosse logo and the SEI certification mark on product and packaging. The NFHS's 2026 boys' points of emphasis repeat that shoulder pads and goalkeeper chest protectors must meet NOCSAE standards.

World Lacrosse's requirements apply at its own and sanctioned events, and its sixes and box rule books accept NOCSAE certification or a comparable standard; it says members are strongly encouraged to adopt them domestically, so they are not automatically binding in national play. The current men's field rule book (2025-2027 v1.0, Rule 17.1) requires a chest protector only for the goalkeeper and names no standard; a later version, 1.1 of January 2026, exists but was not read.

Women's and girls' field players

None of the US sources found requires ND200 chest protection for girls' or women's field players. That is an absence in the sources, not a confirmed rule, because the 2026 girls' and women's rule books were not read. World Lacrosse's FAQ explains that it does not require commotio cordis protection for women's field and sixes field players, citing 1982 to 2023 data of four incidents and one death among female athletes in all sports, none attributed to lacrosse, against 60 incidents and 33 deaths among males. World Lacrosse does not name the source of those figures.