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Changes in core temperature during an elite female rugby sevens tournament

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journal contribution
posted on 16.11.2020, 16:44 authored by Mitchell Henderson, Bryna CR Chrismas, Christopher J Stevens, Aaron J Coutts, Lee TaylorLee Taylor
Purpose: To characterize player core temperature (Tc) across a World Rugby Women’s Sevens Series tournament day (WRWSS) and determine the efficacy of commonly employed cold-water-immersion (CWI) protocols. Methods: Tc was measured in 12 elite female rugby sevens athletes across 3 games (G1–3) from day 1 of the Sydney WRWSS tournament. Symptoms of exertional heat illness, perceptual scales, CWI details, playing minutes, external-load data (measured by global positioning systems), and wet-bulb globe temperature (range 18.5°C–20.1°C) were also collected. Linear mixed models and magnitude-based inferences were used to assess differences in Tc between periods (G1–3 and warm-ups [WU]). Results: Average Tc was “very likely” lower (effect size; ±90% confidence limit −0.33; ±0.18) in G1 than in G2. Peak Tc was “very likely” (0.71; ±0.28) associated with increased playing time. CWI did not remove the accumulated Tc due to WU and match-play activity (∼1°C–2°C rise in Tc still present compared with Tc at WU onset for players ≥6-min match play). Conclusions: Elite WRWSS athletes experienced high Tc during WU (Tc peak 37.9–39.0°C) and matches (Tc peak 37.9–39.8°C), a magnitude known to reduce intermittent high-intensity physical performance (≥39°C). The CWI protocol resulted in players (≥6-min match play) with ∼1°C to 2°C raised Tc compared with Tc at WU onset.

History

School

  • Sport, Exercise and Health Sciences

Published in

International Journal of Sports Physiology and Performance

Volume

15

Issue

4

Pages

571 - 580

Publisher

Human Kinetics

Version

AM (Accepted Manuscript)

Rights holder

© Human Kinetics

Publisher statement

Accepted author manuscript version reprinted, by permission, from International Journal of Sports Physiology and Performance, 2020, 15 (4): 571-580, https://doi.org/10.1123/ijspp.2019-0375. © Human Kinetics, Inc.

Acceptance date

29/07/2019

Publication date

2020-04-01

Copyright date

2020

ISSN

1555-0265

eISSN

1555-0273

Language

en

Depositor

Dr Lee Taylor. Deposit date: 13 November 2020

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