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Biochemical and endocrine responses to impact and collision during elite Rugby League match play

journal contribution
posted on 06.12.2017, 00:00 by C McLellan, D Lovell, Gregory Gass
McLellan, CP, Lovell, DI, and Gass, GC. Biochemical and endocrine responses to impact and collision during elite rugby league match play. J Strength Cond Res 25(6): 1553–1562, 2011—The purpose of this study was to investigate the relationship between the prematch and short-term postmatch biochemical and endocrine responses to the intensity, number, and distribution of impacts associated with collisions during elite Rugby League match play. Seventeen elite male Rugby League players each provided blood and saliva samples 24 hours prematch, 30 minutes prematch, 30 minutes postmatch, and then at 24-hour intervals for a period of 5 days postmatch to determine plasma creatine kinase concentration ([CK]) and salivary cortisol concentration ([sCort]). The intensity, number, and distribution of impact forces experienced by players during match play were recorded using portable global positioning systems (GPSs). The change in the dependent variables at each sample collection time was compared to 24 hours prematch and 30-minute prematch measures. The [CK] and [sCort] increased significantly (p < 0.05) during match play. Significant correlations (p < 0.05) were observed between the number of hit-ups and peak [CK] 24 hours postmatch, 48 hours postmatch, and 72 hours postmatch (p < 0.05). The number of impacts recorded in zone 5 (8.1–10.0G) and zone 6 (>10.1G) during match play was significantly correlated (p < 0.05) to [CK] 30 minutes postmatch, 24 hours post, 48 hours post, and 72 hours postmatch. The GPS was able to provide data on the intensity, number, and distribution of impacts resulting from collisions during match play. Elite Rugby League match play resulted in significant skeletal muscle damage and was highly dependent on the number of heavy collisions >8.1G. [CK] remained elevated 120 hours postmatch identifying that at least 5 days modified activity is required to achieve full recovery after elite Rugby League match play.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

25

Issue

6

Start Page

1553

End Page

1562

Number of Pages

10

ISSN

1064-8011

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Bond University (Gold Coast, Qld.); TBA Research Institute; University of the Sunshine Coast;

Era Eligible

Yes

Journal

Journal of strength and conditioning research.

Exports

CQUniversity

Categories

Exports