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Preliminary Evidence of Transient Fatigue and Pacing during Interchanges in Rugby League.
MedLine Citation:
PMID:  22902435     Owner:  NLM     Status:  Publisher    
PURPOSE: This study aimed to quantify changes in heart rate (HR) and movement speeds in interchanged and whole match players during 35 elite rugby league performances. METHODS: Performances were separated in to whole match, interchange bout 1 and interchange bout 2 and further subdivided in to relative match quartiles. Mean percentages of HR rate peak (%HRpeak), total and high intensity running (> 14 km·h-1) metres per minute (m·min-1) were recorded. RESULTS: For whole match players, a decline in high intensity m·min-1 and %HRpeak was observed between successive quartiles (P < 0.05). High intensity m·min-1 during interchange 1 also progressively declined, although initial m·min-1 was higher than whole match (24.2 ± 7.9 m·min-1 c.f. 18.3 ± 4.7 m·min-1, P = 0.018), and %HRpeak did not change over match quartiles (P > 0.05). During interchange 2, there was a decline in high intensity m·min-1 from quartile 1 to 3 (18 ± 4.1 c.f. 13.4 ± 5 m·min-1, P = 0.048) before increasing in quartile 4. Quartile 1 to 2 also showed an increase in %HRpeak (85.2 ± 6.5 c.f. 87.3 ± 4.2%, P = 0.022). CONCLUSIONS: Replacement players adopted a high initial intensity in their first match quartile before a severe decline thereafter. However, in a second bout, lower exercise intensity at the outset enabled a higher physiological exertion for later periods. These findings inform interchange strategy and conditioning for coaches, whilst also providing preliminary evidence of pacing in team sport.
Mark Waldron; Jamie Highton; Matthew Daniels; Craig Twist
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-15
Journal Detail:
Title:  International journal of sports physiology and performance     Volume:  -     ISSN:  1555-0265     ISO Abbreviation:  Int J Sports Physiol Perform     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101276430     Medline TA:  Int J Sports Physiol Perform     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
University of Chester, Department of Sports and Exercise Sciences, Chester, and St Helens Rugby League Football Club, St Helens, United Kingdom.
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