An examination of a modified Yo-Yo test to measure intermittent running performance in rugby players. Issue 8 (14th September 2018)

• Record Type: Journal Article
• Authors: Dobbin, Nick; Moss, Samantha Louise; Highton, Jamie; Twist, Craig
• Is Part Of: European journal of sport science. Volume 18:Issue 8(2018)
• Page Start: 1068
• Page End: 1076
• Publication Date: 2018-09-14
• Subjects: Fitness -- physiology -- performance -- team sport -- testing; Sports sciences -- Periodicals; Sports Medicine -- Periodicals; Exercise -- Periodicals; Sports -- Periodicals; 612
• DOI: 10.1080/17461391.2018.1475509
• Languages: English
• ISSNs: 1746-1391

Abstract

Abstract: This study examined how starting each shuttle in the prone position altered the internal, external and perceptual responses to the Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IR1). Using a randomized crossover design, 17 male rugby players completed the Yo-Yo IR1 and prone Yo-Yo IR1 on two separate occasions. External loads (via microtechnology), , heart rate (HR) and rating of perceived exertion (RPE) were measured at 160, 280 and 440 m (sub-maximal) and when the test was terminated (peak). The pre-to-post change in blood lactate concentration (Δ[La]b ) was determined for both tests. All data were analysed using effect sizes (ES) and magnitude-based inferences. Between-trial differences (ES ± 90% CL) indicated that total distance was most likely lower (−1.87 ± 0.19), whereas other measures of peak external load were likely to very likely higher during the prone Yo-Yo IR1 (0.62–1.80). Sub-maximal RPE was likely to most likely higher (0.40–0.96) and peak RPE very likely higher (0.63 ± 0.41) in the prone Yo-Yo IR1. The change in [La]b was likely higher after the prone Yo-Yo IR1. Mean HR was possibly lower at 440 m (−0.25 ± 0.29) as was peak HR (−0.26 ± 0.25) in the prone Yo-Yo IR1., and were likely to very likely higher at 280 and 440 m (ES = 0.36–1.22), while peak values were possibly to likely higher (ES = 0.23–0.37) in the prone Yo-Yo IR1. Adopting a prone position during the Yo-Yo IR1 increases the internal, external and perceptual responses, placing greater emphasis on metabolically demanding actions typical of rugby.