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dc.contributor.authorKing, Den_NZ
dc.contributor.authorHume, PAen_NZ
dc.contributor.authorGissane, Cen_NZ
dc.contributor.authorBrughelli, Men_NZ
dc.contributor.authorClark, Ten_NZ
dc.identifier.citationSports Medicine, Volume 46, Issue 2, pp 151-169en_NZ
dc.description.abstractBackground Head impacts and resulting head accelerations cause concussive injuries. There is no standard for reporting head impact data in sports to enable comparison between studies. Objective The aim was to outline methods for reporting head impact acceleration data in sport and the effect of the acceleration thresholds on the number of impacts reported. Methods A systematic review of accelerometer systems utilised to report head impact data in sport was conducted. The effect of using different thresholds on a set of impact data from 38 amateur senior rugby players in New Zealand over a competition season was calculated. Results Of the 52 studies identified, 42 % reported impacts using a[10-g threshold, where g is the acceleration of gravity. Studies reported descriptive statistics as mean ± standard deviation, median, 25th to 75th interquartile range, and 95th percentile. Application of the varied impact thresholds to the New Zealand data set resulted in 20,687 impacts of [10 g, 11,459 (45 % less) impacts of[15 g, and 4024 (81 % less) impacts of[30 g. Discussion Linear and angular raw data were most frequently reported. Metrics combining raw data may be more useful; however, validity of the metrics has not been adequately addressed for sport. Differing data collectionmethods and descriptive statistics for reporting head impacts in sports limit inter-study comparisons. Consensus on data analysis methods for sports impact assessment is needed, including thresholds. Based on the available data, the 10-g threshold is the most commonly reported impact threshold and should be reported as the median with 25th and 75th interquartile ranges as the data are non-normally distributed. Validation studies are required to determine the best threshold and metrics for impact acceleration data collection in sport. Conclusion Until in-field validation studies are completed, it is recommended that head impact data should be reported as median and interquartile ranges using the 10-g impact threshold.en_NZ
dc.rightsAn author may self-archive an author-created version of his/her article on his/her own website and or in his/her institutional repository. He/she may also deposit this version on his/her funder’s or funder’s designated repository at the funder’s request or as a result of a legal obligation, provided it is not made publicly available until 12 months after official publication. He/ she may not use the publisher's PDF version, which is posted on, for the purpose of self-archiving or deposit. Furthermore, the author may only post his/her version provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at”. (Please also see Publisher’s Version and Citation).
dc.subjectConcussion; Acceleration; Linear; Rotational
dc.titleThe influence of head impact threshold for reporting data in contact and collision sports: system review and original data analysisen_NZ
dc.typeJournal Article

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