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Carbohydrate and caffeine improves high intensity running of elite rugby league interchange players during simulated match play.

Clarke, JS and Highton, J and Close, GL and Twist, C (2016) Carbohydrate and caffeine improves high intensity running of elite rugby league interchange players during simulated match play. Journal of Strength and Conditioning Research. ISSN 1533-4287

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Abstract

The study examined the effects of carbohydrate and caffeine ingestion on simulated rugby league interchange performance. Eight male elite rugby league forwards completed two trials of a rugby league simulation protocol for interchange players seven days apart in a randomized crossover design, ingesting either carbohydrate (CHO; 40 g·h-1) or carbohydrate and caffeine (CHO-C) (40 g·h-1 + 3 mg·kg-1) drink. Movement characteristics, heart rate, ratings of perceived exertion (RPE), and countermovement jump height (CMJ) were measured during the protocol. CHO-C resulted in likely to very likely higher mean running speeds (ES 0.43 to 0.75), distance in high intensity running (ES 0.41 to 0.64) and mean sprint speeds (ES 0.39 to 1.04) compared to CHO. Heart rate was possibly to very likely higher (ES 0.32 to 0.74) and RPE was likely to very likely lower (ES -0.53 to 0.86) with CHO-C. There was a likely trivial to possibly higher CMJ in CHO-C compared to CHO (ES 0.07 to 0.25). The co-ingestion of carbohydrate with caffeine has an ergogenic effect to reduce the sense of effort and increase high intensity running capability that might be employed to enhance interchange running performance in elite rugby league players.

Item Type: Article
Additional Information: Jon S Clarke; Jamie Highton; Graeme L Close; Craig Twist. Carbohydrate and caffeine improves high intensity running of elite rugby league interchange players during simulated match play. Journal of Strength and Conditioning Research. ():, NOV 2016
Uncontrolled Keywords: 1106 Human Movement And Sports Science
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Lippincott, Williams & Wilkins
Related URLs:
Date Deposited: 07 Feb 2017 10:53
Last Modified: 07 Sep 2017 12:43
DOI or Identification number: 10.1519/JSC.0000000000001742
URI: http://researchonline.ljmu.ac.uk/id/eprint/5458

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