Performance Analysis Performance Analysis in Support of in Support of Epidemiology and Prevention Epidemiology and Prevention Keith Lyons Keith Lyons Centre for Performance Analysis Centre for Performance Analysis University of Wales Institute Cardiff University of Wales Institute Cardiff
A paper presented at a symposium hosted in Wales prior to RWC 1999. Presented at a time when there was considerable debate about safety in rugby union scrums.
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Performance Analysis Performance Analysis in Support of in Support of
Epidemiology and PreventionEpidemiology and Prevention
Keith LyonsKeith Lyons
Centre for Performance AnalysisCentre for Performance Analysis
University of Wales Institute CardiffUniversity of Wales Institute Cardiff
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For lack of a practical method of For lack of a practical method of determining longitude, every great determining longitude, every great captain in the Age of Exploration captain in the Age of Exploration became lost at sea despite the best became lost at sea despite the best available charts and compassesavailable charts and compasses.
Sobel (1996:6Sobel (1996:6))
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Performance AnalysisPerformance Analysis
A disciplined insight that …A disciplined insight that …
Identify structural invariance and variance Identify structural invariance and variance of games.of games.
MACRODATAMACRODATA
Identify action components of games.Identify action components of games.
MICRODATAMICRODATA
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An Example: The ScrummageAn Example: The Scrummage
In 18 games this season there have been In 18 games this season there have been
585 scrums585 scrums..
The game average is The game average is 2727..
The highest incidence is The highest incidence is 38 38 (SA v AUS)(SA v AUS)
The lowest incidence is The lowest incidence is 1515 (AUS v IRL) (AUS v IRL)
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A GAME EXAMPLE (1998)A GAME EXAMPLE (1998)
Total number of scrumsTotal number of scrums 3535
Total time takenTotal time taken 18m 56s18m 56s
% of game% of game 23%23%
Average durationAverage duration 32.5s32.5s
Front Row engagementsFront Row engagements 5151
Penalties and Free kicksPenalties and Free kicks 77
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Five Metre Scrum DataFive Metre Scrum Data
Total 5 metre scrumsTotal 5 metre scrums 1010Total time takenTotal time taken 7m 06s7m 06sAverage time per scrumAverage time per scrum43s43sClean scrumsClean scrums 11Number of engagementsNumber of engagements 1818CollapsesCollapses 66
PenaltiesPenalties 44
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Is there a Problem?Is there a Problem?
43 seconds28 secondsAv. Duration
43Penalties
76Wheels
6 (60%)3 (12%)Collapses
1 (10%)10 (52%)Clean scrums
1833Engagements
1025Total scrums
5m ScrumsNon 5m Scrums
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Dilemma?Dilemma?
If the scrummage is an essential and non-If the scrummage is an essential and non-negotiable feature of the game what can negotiable feature of the game what can be done about 5 metre scrums in terms of be done about 5 metre scrums in terms of risk management?risk management?
In clean scrums the average time from In clean scrums the average time from engagement to put in is engagement to put in is 3.5s3.5s and put in and put in
to exit to exit 3.5s3.5s..
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DATA DRIVEN INTERVENTION?DATA DRIVEN INTERVENTION?
The significance of the scrummage as an The significance of the scrummage as an essential feature of the game.essential feature of the game.
The problems associated with 5 metre The problems associated with 5 metre scrums.scrums.
The transformation of a means of re-The transformation of a means of re-introducing the ball into play into a introducing the ball into play into a major scoring opportunity.major scoring opportunity.
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We can develop a rich picture We can develop a rich picture of performance to support of performance to support
Epidemiology and PreventionEpidemiology and Prevention
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HowHow??
1.1. Agreement about research agenda.Agreement about research agenda.
4.4. Innovative use of digital technology.Innovative use of digital technology.
5.5. A forum to integrate our A forum to integrate our understandings of performance.understandings of performance.
6.6. World best practice.World best practice.
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www.hyder.com/rugbywww.hyder.com/rugby
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With his marine clocks, John Harrison tested the waters of space-time. He succeeded against all odds, in using the fourth - temporal - dimension to link points on the three-dimensional globe. He wrested the world’s whereabouts from the stars, and locked the secret in a pocket watch.