Optimal break structures and cooling strategies to mitigate heat stress during a Rugby League match simulation.

Journal of Science and Medicine in Sport
Connor GrahamOllie Jay

Abstract

To examine, 1) optimal structure of break periods to mitigate physiological heat strain during rugby league play (Stage 1); and ii) effectiveness of three different cooling strategies applied during breaks (Stage 2). Counter-balanced crossover design. In 37 °C, 50% RH, 11 males completed six simulated 80-min (two 40-min halves) rugby league matches on a treadmill with different break structures: regular game (RG) (12-min halftime), 1-min or 3-min "quarter-time" breaks halfway through each half with a 12-min halftime break (R1C and R3C), a 20-min halftime break (EH), or 1-min or 3-min quarter-time breaks with a 20-min halftime break (E1C and E3C) [Stage 1]. Nine participants completed Stage 2, which assessed the application of either ice towels (ICE), an electric fan (FAN) or a misting fan (MST) during breaks in the E3C protocol which, in Stage 1, prevailed as the optimal break structure. Stage 1: Irrespective of quarter-time break duration, reductions in rectal temperature (-0.24 °C ± 0.24) and heart rate (-61 ± 10 bpm) during the halftime break were greater with a 20-min compared to a 12-min break (-0.08 ± 0.13 °C, p = 0.005; -55 ± -9 bpm, p = 0.021). Stage 2: End-game rises in rectal temperature were smaller (p < 0.006) in MS...Continue Reading

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Citations

Jun 28, 2021·Journal of Science and Medicine in Sport·Nicole VargasOllie Jay

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