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A Passive Heat Maintenance Strategy Implemented during a Simulated Half-Time Improves Lower Body Power Output and Repeated Sprint Ability in Professional Rugby Union Players

Alejandro Lucia, Mark Russell, Daniel J. West, Marc A. Briggs, Richard Bracken Orcid Logo, Christian J. Cook, Thibault Giroud, Nicholas Gill, Liam Kilduff Orcid Logo

PLOS ONE, Volume: 10, Issue: 3, Start page: e0119374

Swansea University Authors: Richard Bracken Orcid Logo, Liam Kilduff Orcid Logo

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DOI (Published version): 10.1371/journal.pone.0119374

Abstract

Reduced physical performance has been observed following the half-time period in team sports players, likely due to a decrease in muscle temperature during this period. We examined the effects of a passive heat maintenance strategy employed between successive exercise bouts on core temperature (Tcor...

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Published in: PLOS ONE
ISSN: 1932-6203
Published: 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa21325
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We examined the effects of a passive heat maintenance strategy employed between successive exercise bouts on core temperature (Tcore) and subsequent exercise performance. Eighteen professional Rugby Union players completed this randomised and counter-balanced study. After a standardised warm-up (WU) and 15 min of rest, players completed a repeated sprint test (RSSA 1) and countermovement jumps (CMJ). Thereafter, in normal training attire (Control) or a survival jacket (Passive), players rested for a further 15 min (simulating a typical half-time) before performing a second RSSA (RSSA 2) and CMJ&#x2019;s. Measurements of Tcore were taken at baseline, post-WU, pre-RSSA 1, post-RSSA 1 and pre-RSSA 2. Peak power output (PPO) and repeated sprint ability was assessed before and after the simulated half-time. Similar Tcore responses were observed between conditions at baseline (Control: 37.06&#xB1;0.05&#xB0;C; Passive: 37.03&#xB1;0.05&#xB0;C) and for all other Tcore measurements taken before half-time. After the simulated half-time, the decline in Tcore was lower (-0.74&#xB1;0.08% vs. -1.54 &#xB1;0.06%, p&amp;#60;0.001) and PPO was higher (5610&#xB1;105Wvs. 5440&#xB1;105W, p&amp;#60;0.001) in the Passive versus Control condition. The decline in PPO over half-time was related to the decline in Tcore (r = 0.632, p = 0.005). In RSSA 2, best, mean and total sprint times were 1.39&#xB1;0.17% (p&amp;#60;0.001), 0.55&#xB1;0.06% (p&amp;#60;0.001) and 0.55&#xB1;0.06%(p&amp;#60;0.001) faster for Passive versus Control. Passive heat maintenance reduced declines in Tcore that were observed during a simulated half-time period and improved subsequent PPO and repeated sprint ability in professional Rugby Union players.</abstract><type>Journal Article</type><journal>PLOS ONE</journal><volume>10</volume><journalNumber>3</journalNumber><paginationStart>e0119374</paginationStart><publisher/><issnElectronic>1932-6203</issnElectronic><keywords/><publishedDay>18</publishedDay><publishedMonth>3</publishedMonth><publishedYear>2015</publishedYear><publishedDate>2015-03-18</publishedDate><doi>10.1371/journal.pone.0119374</doi><url>http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0119374</url><notes>&#xA9; 2015 Russell et al. 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spelling 2018-04-30T11:28:49.1616982 v2 21325 2015-05-12 A Passive Heat Maintenance Strategy Implemented during a Simulated Half-Time Improves Lower Body Power Output and Repeated Sprint Ability in Professional Rugby Union Players f5da81cd18adfdedb2ccb845bddc12f7 0000-0002-6986-6449 Richard Bracken Richard Bracken true false 972ed9a1dda7a0de20581a0f8350be98 0000-0001-9449-2293 Liam Kilduff Liam Kilduff true false 2015-05-12 STSC Reduced physical performance has been observed following the half-time period in team sports players, likely due to a decrease in muscle temperature during this period. We examined the effects of a passive heat maintenance strategy employed between successive exercise bouts on core temperature (Tcore) and subsequent exercise performance. Eighteen professional Rugby Union players completed this randomised and counter-balanced study. After a standardised warm-up (WU) and 15 min of rest, players completed a repeated sprint test (RSSA 1) and countermovement jumps (CMJ). Thereafter, in normal training attire (Control) or a survival jacket (Passive), players rested for a further 15 min (simulating a typical half-time) before performing a second RSSA (RSSA 2) and CMJ’s. Measurements of Tcore were taken at baseline, post-WU, pre-RSSA 1, post-RSSA 1 and pre-RSSA 2. Peak power output (PPO) and repeated sprint ability was assessed before and after the simulated half-time. Similar Tcore responses were observed between conditions at baseline (Control: 37.06±0.05°C; Passive: 37.03±0.05°C) and for all other Tcore measurements taken before half-time. After the simulated half-time, the decline in Tcore was lower (-0.74±0.08% vs. -1.54 ±0.06%, p&#60;0.001) and PPO was higher (5610±105Wvs. 5440±105W, p&#60;0.001) in the Passive versus Control condition. The decline in PPO over half-time was related to the decline in Tcore (r = 0.632, p = 0.005). In RSSA 2, best, mean and total sprint times were 1.39±0.17% (p&#60;0.001), 0.55±0.06% (p&#60;0.001) and 0.55±0.06%(p&#60;0.001) faster for Passive versus Control. Passive heat maintenance reduced declines in Tcore that were observed during a simulated half-time period and improved subsequent PPO and repeated sprint ability in professional Rugby Union players. Journal Article PLOS ONE 10 3 e0119374 1932-6203 18 3 2015 2015-03-18 10.1371/journal.pone.0119374 http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0119374 © 2015 Russell et al. This is an openaccess article distributed under the terms of theCreative Commons Attribution License, which permitsunrestricted use, distribution, and reproduction in anymedium, provided the original author and source arecredited. COLLEGE NANME Sport and Exercise Sciences COLLEGE CODE STSC Swansea University 2018-04-30T11:28:49.1616982 2015-05-12T11:57:40.8483406 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences Alejandro Lucia 1 Mark Russell 2 Daniel J. West 3 Marc A. Briggs 4 Richard Bracken 0000-0002-6986-6449 5 Christian J. Cook 6 Thibault Giroud 7 Nicholas Gill 8 Liam Kilduff 0000-0001-9449-2293 9 0021325-18062015115753.pdf Passive__Heat__Maintenance.pdf 2015-06-18T11:57:53.5770000 Output 346492 application/pdf Version of Record true 2015-06-18T00:00:00.0000000 false
title A Passive Heat Maintenance Strategy Implemented during a Simulated Half-Time Improves Lower Body Power Output and Repeated Sprint Ability in Professional Rugby Union Players
spellingShingle A Passive Heat Maintenance Strategy Implemented during a Simulated Half-Time Improves Lower Body Power Output and Repeated Sprint Ability in Professional Rugby Union Players
Richard Bracken
Liam Kilduff
title_short A Passive Heat Maintenance Strategy Implemented during a Simulated Half-Time Improves Lower Body Power Output and Repeated Sprint Ability in Professional Rugby Union Players
title_full A Passive Heat Maintenance Strategy Implemented during a Simulated Half-Time Improves Lower Body Power Output and Repeated Sprint Ability in Professional Rugby Union Players
title_fullStr A Passive Heat Maintenance Strategy Implemented during a Simulated Half-Time Improves Lower Body Power Output and Repeated Sprint Ability in Professional Rugby Union Players
title_full_unstemmed A Passive Heat Maintenance Strategy Implemented during a Simulated Half-Time Improves Lower Body Power Output and Repeated Sprint Ability in Professional Rugby Union Players
title_sort A Passive Heat Maintenance Strategy Implemented during a Simulated Half-Time Improves Lower Body Power Output and Repeated Sprint Ability in Professional Rugby Union Players
author_id_str_mv f5da81cd18adfdedb2ccb845bddc12f7
972ed9a1dda7a0de20581a0f8350be98
author_id_fullname_str_mv f5da81cd18adfdedb2ccb845bddc12f7_***_Richard Bracken
972ed9a1dda7a0de20581a0f8350be98_***_Liam Kilduff
author Richard Bracken
Liam Kilduff
author2 Alejandro Lucia
Mark Russell
Daniel J. West
Marc A. Briggs
Richard Bracken
Christian J. Cook
Thibault Giroud
Nicholas Gill
Liam Kilduff
format Journal article
container_title PLOS ONE
container_volume 10
container_issue 3
container_start_page e0119374
publishDate 2015
institution Swansea University
issn 1932-6203
doi_str_mv 10.1371/journal.pone.0119374
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences
url http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0119374
document_store_str 1
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description Reduced physical performance has been observed following the half-time period in team sports players, likely due to a decrease in muscle temperature during this period. We examined the effects of a passive heat maintenance strategy employed between successive exercise bouts on core temperature (Tcore) and subsequent exercise performance. Eighteen professional Rugby Union players completed this randomised and counter-balanced study. After a standardised warm-up (WU) and 15 min of rest, players completed a repeated sprint test (RSSA 1) and countermovement jumps (CMJ). Thereafter, in normal training attire (Control) or a survival jacket (Passive), players rested for a further 15 min (simulating a typical half-time) before performing a second RSSA (RSSA 2) and CMJ’s. Measurements of Tcore were taken at baseline, post-WU, pre-RSSA 1, post-RSSA 1 and pre-RSSA 2. Peak power output (PPO) and repeated sprint ability was assessed before and after the simulated half-time. Similar Tcore responses were observed between conditions at baseline (Control: 37.06±0.05°C; Passive: 37.03±0.05°C) and for all other Tcore measurements taken before half-time. After the simulated half-time, the decline in Tcore was lower (-0.74±0.08% vs. -1.54 ±0.06%, p&#60;0.001) and PPO was higher (5610±105Wvs. 5440±105W, p&#60;0.001) in the Passive versus Control condition. The decline in PPO over half-time was related to the decline in Tcore (r = 0.632, p = 0.005). In RSSA 2, best, mean and total sprint times were 1.39±0.17% (p&#60;0.001), 0.55±0.06% (p&#60;0.001) and 0.55±0.06%(p&#60;0.001) faster for Passive versus Control. Passive heat maintenance reduced declines in Tcore that were observed during a simulated half-time period and improved subsequent PPO and repeated sprint ability in professional Rugby Union players.
published_date 2015-03-18T03:25:15Z
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