The use of individualized speed and intensity thresholds for determining the distance run at high-intensity in professional soccer
Lovell, Ric; Abt, Grant
Dr Grant Abt G.Abt@hull.ac.uk
Reader in Sport and Exercise Physiology and Head of Department for Sport, Health and Exercise Science
As with other match analysis systems, ProZone® uses an absolute speed threshold to identify running speeds at "high-intensity". In this study, we examined the use of an individualized high-intensity speed threshold based on the speed at the second ventilatory threshold (VT 2speed ) for assessment of the distance run at high-intensity during matches. Ten professional soccer players completed a maximal treadmill test to determine VT 2speed . Match data were identified by means of the ProZone® match analysis system. The distances run at high-intensity during matches were calculated using the default value (19.8 km·h -1 ) and VT 2speed . Differences between VT 2speed and the default were analysed using a non-parametric median sign test. The distances run at high-intensity were compared with a paired t-test. The median VT 2speed was 15 km·h -1 (range 14-16 km·h -1 ), which was less than the default (P < 0.01). Mean distance run at high-intensity based on the default and VT 2speed was 845 m (s = 296) and 2258 m (s = 707), respectively [mean difference 1413 m; P < 0.001 (95% CI: 1037-1789 m)]. The high-intensity running speeds based on the second ventilatory threshold are substantially less than that used as the default within the ProZone® match analysis system, thus the distance run at high-intensity can be substantially underestimated.
|Journal Article Type||Article|
|Publication Date||Sep 14, 2009|
|Journal||JOURNAL OF SPORTS SCIENCES|
|Publisher||Taylor & Francis|
|Peer Reviewed||Peer Reviewed|
|Article Number||PII 913335466|
|APA6 Citation||Lovell, R., & Abt, G. (2009). The use of individualized speed and intensity thresholds for determining the distance run at high-intensity in professional soccer. Journal of sports sciences, 27(9), (893-898). doi:10.1080/02640410902998239. ISSN 0264-0414|
|Keywords||ProZone; Soccer; Exercise intensity|
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