The influence of passive heat maintenance on lower body power output and repeated sprint performance in professional rugby league players

Liam P Kilduff, Daniel J. West, Natalie Williams, C.J. Cook

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Objectives: The pre-competition warm-up mediates many temperature related physiological changes which generally lead to an improvement in performance. However, after ceasing exercise body temperature declines rapidly, which reduces some of the benefits of the initial warm-up. We examined the effects of a passive heat maintenance strategy on post-warm-up core temperature (Tcore) and performance in professional rugby league players. Design: Twenty professional rugby league players completed this randomised and counter-balanced study. Methods: After a standardised warm-up, players completed a countermovement jump (CMJ) before resting for 15min wearing normal training attire (control) or wearing a passive heat maintenance jacket (PHM), players then completed another CMJ and a repeated sprint protocol (RSA). Tcore was measured at baseline, post-warm-up, pre-RSA and post-RSA. CMJ were analysed for peak power output (PPO), and RSA for fastest, mean and total sprint time. Results: Post-warm-up Tcore (mean±SD; control 37.70±0.28; PHM 37.70±0.27°C; p=0.741) and PPO (control 5220±353 vs. PHM 5213±331W; p=0.686) were similar between conditions. At pre-RSA, PHM was associated with greater Tcore (control 37.14±0.31 vs. PHM 37.51±0.30°C; p<0.001) and PPO (control 4868±345 vs. PHM 5056±344W; p<0.001) when compared to control. The decline in PPO from post-warm-up to pre-RSA was related to the drop in Tcore (r=0.71; p<0.001). During the RSA, fastest, mean and total sprint time were all improved under PHM compared to control (p<0.05). Conclusions: Passive heat maintenance is an effective method of attenuating the post-warm-up decline in Tcore and improves PPO and repeated sprint ability in professional rugby league players. © 2012 Sports Medicine Australia.
Original languageEnglish
Pages (from-to)482-486
Number of pages5
JournalJournal of Science and Medicine in Sport
Volume16
Issue number5
DOIs
Publication statusPublished - 2013
Externally publishedYes

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Football
Hot Temperature
Maintenance
Sports Medicine
Temperature
Body Temperature

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title = "The influence of passive heat maintenance on lower body power output and repeated sprint performance in professional rugby league players",
abstract = "Objectives: The pre-competition warm-up mediates many temperature related physiological changes which generally lead to an improvement in performance. However, after ceasing exercise body temperature declines rapidly, which reduces some of the benefits of the initial warm-up. We examined the effects of a passive heat maintenance strategy on post-warm-up core temperature (Tcore) and performance in professional rugby league players. Design: Twenty professional rugby league players completed this randomised and counter-balanced study. Methods: After a standardised warm-up, players completed a countermovement jump (CMJ) before resting for 15min wearing normal training attire (control) or wearing a passive heat maintenance jacket (PHM), players then completed another CMJ and a repeated sprint protocol (RSA). Tcore was measured at baseline, post-warm-up, pre-RSA and post-RSA. CMJ were analysed for peak power output (PPO), and RSA for fastest, mean and total sprint time. Results: Post-warm-up Tcore (mean±SD; control 37.70±0.28; PHM 37.70±0.27°C; p=0.741) and PPO (control 5220±353 vs. PHM 5213±331W; p=0.686) were similar between conditions. At pre-RSA, PHM was associated with greater Tcore (control 37.14±0.31 vs. PHM 37.51±0.30°C; p<0.001) and PPO (control 4868±345 vs. PHM 5056±344W; p<0.001) when compared to control. The decline in PPO from post-warm-up to pre-RSA was related to the drop in Tcore (r=0.71; p<0.001). During the RSA, fastest, mean and total sprint time were all improved under PHM compared to control (p<0.05). Conclusions: Passive heat maintenance is an effective method of attenuating the post-warm-up decline in Tcore and improves PPO and repeated sprint ability in professional rugby league players. {\circledC} 2012 Sports Medicine Australia.",
keywords = "Athletic performance, Body temperature, Warm-up exercises",
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The influence of passive heat maintenance on lower body power output and repeated sprint performance in professional rugby league players. / Kilduff, Liam P; West, Daniel J.; Williams, Natalie; Cook, C.J.

In: Journal of Science and Medicine in Sport, Vol. 16, No. 5, 2013, p. 482-486.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The influence of passive heat maintenance on lower body power output and repeated sprint performance in professional rugby league players

AU - Kilduff, Liam P

AU - West, Daniel J.

AU - Williams, Natalie

AU - Cook, C.J.

N1 - Cited By :13 Export Date: 25 May 2017

PY - 2013

Y1 - 2013

N2 - Objectives: The pre-competition warm-up mediates many temperature related physiological changes which generally lead to an improvement in performance. However, after ceasing exercise body temperature declines rapidly, which reduces some of the benefits of the initial warm-up. We examined the effects of a passive heat maintenance strategy on post-warm-up core temperature (Tcore) and performance in professional rugby league players. Design: Twenty professional rugby league players completed this randomised and counter-balanced study. Methods: After a standardised warm-up, players completed a countermovement jump (CMJ) before resting for 15min wearing normal training attire (control) or wearing a passive heat maintenance jacket (PHM), players then completed another CMJ and a repeated sprint protocol (RSA). Tcore was measured at baseline, post-warm-up, pre-RSA and post-RSA. CMJ were analysed for peak power output (PPO), and RSA for fastest, mean and total sprint time. Results: Post-warm-up Tcore (mean±SD; control 37.70±0.28; PHM 37.70±0.27°C; p=0.741) and PPO (control 5220±353 vs. PHM 5213±331W; p=0.686) were similar between conditions. At pre-RSA, PHM was associated with greater Tcore (control 37.14±0.31 vs. PHM 37.51±0.30°C; p<0.001) and PPO (control 4868±345 vs. PHM 5056±344W; p<0.001) when compared to control. The decline in PPO from post-warm-up to pre-RSA was related to the drop in Tcore (r=0.71; p<0.001). During the RSA, fastest, mean and total sprint time were all improved under PHM compared to control (p<0.05). Conclusions: Passive heat maintenance is an effective method of attenuating the post-warm-up decline in Tcore and improves PPO and repeated sprint ability in professional rugby league players. © 2012 Sports Medicine Australia.

AB - Objectives: The pre-competition warm-up mediates many temperature related physiological changes which generally lead to an improvement in performance. However, after ceasing exercise body temperature declines rapidly, which reduces some of the benefits of the initial warm-up. We examined the effects of a passive heat maintenance strategy on post-warm-up core temperature (Tcore) and performance in professional rugby league players. Design: Twenty professional rugby league players completed this randomised and counter-balanced study. Methods: After a standardised warm-up, players completed a countermovement jump (CMJ) before resting for 15min wearing normal training attire (control) or wearing a passive heat maintenance jacket (PHM), players then completed another CMJ and a repeated sprint protocol (RSA). Tcore was measured at baseline, post-warm-up, pre-RSA and post-RSA. CMJ were analysed for peak power output (PPO), and RSA for fastest, mean and total sprint time. Results: Post-warm-up Tcore (mean±SD; control 37.70±0.28; PHM 37.70±0.27°C; p=0.741) and PPO (control 5220±353 vs. PHM 5213±331W; p=0.686) were similar between conditions. At pre-RSA, PHM was associated with greater Tcore (control 37.14±0.31 vs. PHM 37.51±0.30°C; p<0.001) and PPO (control 4868±345 vs. PHM 5056±344W; p<0.001) when compared to control. The decline in PPO from post-warm-up to pre-RSA was related to the drop in Tcore (r=0.71; p<0.001). During the RSA, fastest, mean and total sprint time were all improved under PHM compared to control (p<0.05). Conclusions: Passive heat maintenance is an effective method of attenuating the post-warm-up decline in Tcore and improves PPO and repeated sprint ability in professional rugby league players. © 2012 Sports Medicine Australia.

KW - Athletic performance

KW - Body temperature

KW - Warm-up exercises

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DO - 10.1016/j.jsams.2012.11.889

M3 - Article

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JO - Australian Journal of Science and Medicine in Sport

JF - Australian Journal of Science and Medicine in Sport

SN - 1440-2440

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