The reliability and usefulness of an individualised submaximal shuttle run test in elite rugby league players

Tannath J. Scott, Shaun J. Mclaren, Johnpaul Caia, Vincent G. Kelly

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: The aim of the present study was to examine the reliability and usefulness of a proposed 4-min individualised submaximal shuttle run test (SSRIndiv) in elite rugby league players.

Materials and methods: Twenty-two elite rugby league players competing in the National Rugby League competition (23.2 ± 3.4 years, 186.8 ± 5.4 cm, 100.2 ± 8.5 kg) performed the SSRIndiv twice, seven days apart (test–retest design). The SSRIndiv was prescribed as 75% of the average speed during a 1500-m time trial. Exercise heart rate was calculated as the average heart rate (HR) over the final 30 s (HRex). Seated HR recovery (HRR) was recorded at 1- (HRR60) and 2-min (HRR120) post-exercise. Data were analysed with magnitude-based inferences.

Results: Test–retest typical errors were moderate for HRex (1.2 percentage points; 90% confidence limits: 1.0–1.7), HRR60 (3.4; 2.7–4.6) and HRR120 (2.9; 2.3–3.9). Intraclass correlation coefficients were extremely high for HRex (0.91; 0.78–0.94) and very high for both HRR60 (0.80; 0.61–0.90) and HRR120 (0.84; 0.69–0.92). Thresholds for an individual change that would be likely small and greater than the typical error were ±1.8 (percentage points), ±4.6 and ±4.1 for HRex, HRR60 and HRR120, respectively.

Conclusions: The SSRIndiv demonstrates acceptable reliability in the assessment of HRex and HRR, thus demonstrating its potential usefulness for monitoring fitness and fatigue in elite rugby league players.
Original languageEnglish
Pages (from-to)184-190
Number of pages8
JournalScience and Medicine in Football
Volume2
Issue number3
Early online date12 Mar 2018
DOIs
Publication statusPublished - 3 Jul 2018

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