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J Sci Med Sport. 2015 Mar;18(2):209-13. doi: 10.1016/j.jsams.2014.01.009. Epub 2014 Feb 6.

Influence of physical qualities on post-match fatigue in rugby league players.

Author information

1
School of Exercise Science, Australian Catholic University, Australia. Electronic address: richard.johnston@acu.edu.au.
2
School of Exercise Science, Australian Catholic University, Australia; School of Human Movement Studies, University of Queensland, Australia.
3
School of Human Movement Studies, University of Queensland, Australia.
4
School of Exercise Science, Australian Catholic University, Australia.

Abstract

OBJECTIVES:

This study examined the influence of physical qualities on markers of fatigue and muscle damage following rugby league match-play.

DESIGN:

Between subjects design.

METHODS:

Twenty-one male youth rugby league players (age 19.2 ± 0.7 years; height 180.7 ± 5.6 cm; body mass 89.9 ± 10.0 kg) participated in the study. Yo-Yo intermittent recovery test (level 1), 3 repetition maximum back squat and bench press were assessed prior to 2 competitive fixtures. Neuromuscular fatigue (countermovement jump [CMJ] and plyometric push-up [PP]), and blood creatine kinase (CK) were assessed before and after match-play. During match-play, movements were recorded using microtechnology. Players were divided into high- and low-groups based on physical qualities.

RESULTS:

High Yo-Yo and squat performance resulted in greater loads during match-play (p<0.05). There were larger reductions in CMJ power in the low Yo-Yo group at both 24 (ES=-1.83), and 48 h post-match (ES=-1.33). Despite greater internal and external match loads, changes in CMJ power were similar between squat groups. There were larger increases in blood CK in the low Yo-Yo group at 24 (73% vs. 176%; ES=1.50) and 48 h post-match (28% vs. 80%; ES=1.22). Despite greater contact loads, the high squat group exhibited smaller changes in blood CK post-match (ES=0.25-0.39).

CONCLUSIONS:

Post-match fatigue is lower in players with well-developed high-intensity running ability, and lower body strength, despite these players having greater internal and external match loads.

KEYWORDS:

CK; Muscle damage; Muscular strength; Neuromuscular fatigue; Team sports; Yo-Yo

PMID:
24594214
DOI:
10.1016/j.jsams.2014.01.009
[Indexed for MEDLINE]

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