Abstract
Objectives: In thermoneutral conditions, half-time is associated with reductions in body temperature that acutely impair performance. This laboratory-based study compared active, passive, and combined methods of half-time heat maintenance. Design: Randomised, counterbalanced, cross-over. Methods: After a standardised warm-up (WU) and 15min of rest, professional Rugby Union players (n = 20) completed a repeated sprint test (RSSA1). Throughout a simulated half-time (temperature: 20.5±0.3°C; humidity: 53±5%), players then rested (Control) or wore a survival jacket (Passive) for 15min, or performed a 7min rewarm-up after either 8min of rest (Active), or 8min of wearing a survival jacket (Combined). A second RSSA (RSSA2) followed. Core temperature (Tcore) and peak power output (PPO; during countermovement jumps; CMJ) were measured at baseline, post-RSSA1, pre-RSSA2. Results: All half-time interventions attenuated reductions in Tcore (0.62±0.28°C) observed in Control (Passive: -0.23±0.09°C; Active: -0.17±0.09°C; Combined: -0.03±0.10°C, all p<0.001) but Combined preserved Tcore the most (p<0.001). All half-time interventions attenuated the 385±137W reduction in Control PPO (Passive: -213±79W; Active: -83±72W; Combined: +10±52W; all p<0.001); with best PPO maintenance in Combined (p≤0.001). The fastest sprints occurred in RSSA2 in Combined (6.74±0.21s; p<0.001) but Passive (6.82±0.04s) and Active (6.80±0.05s) sprints were 0.4% (p=0.011) and 0.8% (p=0.002) quicker than Control (6.85±0.04s), respectively. Conclusions: While the efficacy of passive and active heat maintenance methods was supported throughout a simulated half-time, a combined approach to attenuating heat losses appeared the most beneficial for Tcore and subsequent PPO and sprint performance in professional Rugby Union players.
| Language | English |
|---|---|
| Pages | 327-332 |
| Number of pages | 6 |
| Journal | Journal of Science and Medicine in Sport |
| Volume | 21 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Mar 2018 |
| Externally published | Yes |
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A comparison of different heat maintenance methods implemented during a simulated half-time period in professional Rugby Union players. / Russell, Mark; Tucker, Reuben; Cook, Christian J.; Giroud, Thibault; Kilduff, Liam P.
In: Journal of Science and Medicine in Sport, Vol. 21, No. 3, 01.03.2018, p. 327-332.Research output: Contribution to journal › Article
TY - JOUR
T1 - A comparison of different heat maintenance methods implemented during a simulated half-time period in professional Rugby Union players
AU - Russell, Mark
AU - Tucker, Reuben
AU - Cook, Christian J.
AU - Giroud, Thibault
AU - Kilduff, Liam P
PY - 2018/3/1
Y1 - 2018/3/1
N2 - Objectives: In thermoneutral conditions, half-time is associated with reductions in body temperature that acutely impair performance. This laboratory-based study compared active, passive, and combined methods of half-time heat maintenance. Design: Randomised, counterbalanced, cross-over. Methods: After a standardised warm-up (WU) and 15min of rest, professional Rugby Union players (n = 20) completed a repeated sprint test (RSSA1). Throughout a simulated half-time (temperature: 20.5±0.3°C; humidity: 53±5%), players then rested (Control) or wore a survival jacket (Passive) for 15min, or performed a 7min rewarm-up after either 8min of rest (Active), or 8min of wearing a survival jacket (Combined). A second RSSA (RSSA2) followed. Core temperature (Tcore) and peak power output (PPO; during countermovement jumps; CMJ) were measured at baseline, post-RSSA1, pre-RSSA2. Results: All half-time interventions attenuated reductions in Tcore (0.62±0.28°C) observed in Control (Passive: -0.23±0.09°C; Active: -0.17±0.09°C; Combined: -0.03±0.10°C, all p<0.001) but Combined preserved Tcore the most (p<0.001). All half-time interventions attenuated the 385±137W reduction in Control PPO (Passive: -213±79W; Active: -83±72W; Combined: +10±52W; all p<0.001); with best PPO maintenance in Combined (p≤0.001). The fastest sprints occurred in RSSA2 in Combined (6.74±0.21s; p<0.001) but Passive (6.82±0.04s) and Active (6.80±0.05s) sprints were 0.4% (p=0.011) and 0.8% (p=0.002) quicker than Control (6.85±0.04s), respectively. Conclusions: While the efficacy of passive and active heat maintenance methods was supported throughout a simulated half-time, a combined approach to attenuating heat losses appeared the most beneficial for Tcore and subsequent PPO and sprint performance in professional Rugby Union players.
AB - Objectives: In thermoneutral conditions, half-time is associated with reductions in body temperature that acutely impair performance. This laboratory-based study compared active, passive, and combined methods of half-time heat maintenance. Design: Randomised, counterbalanced, cross-over. Methods: After a standardised warm-up (WU) and 15min of rest, professional Rugby Union players (n = 20) completed a repeated sprint test (RSSA1). Throughout a simulated half-time (temperature: 20.5±0.3°C; humidity: 53±5%), players then rested (Control) or wore a survival jacket (Passive) for 15min, or performed a 7min rewarm-up after either 8min of rest (Active), or 8min of wearing a survival jacket (Combined). A second RSSA (RSSA2) followed. Core temperature (Tcore) and peak power output (PPO; during countermovement jumps; CMJ) were measured at baseline, post-RSSA1, pre-RSSA2. Results: All half-time interventions attenuated reductions in Tcore (0.62±0.28°C) observed in Control (Passive: -0.23±0.09°C; Active: -0.17±0.09°C; Combined: -0.03±0.10°C, all p<0.001) but Combined preserved Tcore the most (p<0.001). All half-time interventions attenuated the 385±137W reduction in Control PPO (Passive: -213±79W; Active: -83±72W; Combined: +10±52W; all p<0.001); with best PPO maintenance in Combined (p≤0.001). The fastest sprints occurred in RSSA2 in Combined (6.74±0.21s; p<0.001) but Passive (6.82±0.04s) and Active (6.80±0.05s) sprints were 0.4% (p=0.011) and 0.8% (p=0.002) quicker than Control (6.85±0.04s), respectively. Conclusions: While the efficacy of passive and active heat maintenance methods was supported throughout a simulated half-time, a combined approach to attenuating heat losses appeared the most beneficial for Tcore and subsequent PPO and sprint performance in professional Rugby Union players.
KW - Intermittent
KW - Rewarm-up
KW - Soccer
KW - Temperature
KW - Warm-up
UR - http://www.scopus.com/inward/record.url?scp=85020905731&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/comparison-different-heat-maintenance-methods-implemented-during-simulated-halftime-period-professio-1
U2 - 10.1016/j.jsams.2017.06.005
DO - 10.1016/j.jsams.2017.06.005
M3 - Article
VL - 21
SP - 327
EP - 332
JO - Australian Journal of Science and Medicine in Sport
T2 - Australian Journal of Science and Medicine in Sport
JF - Australian Journal of Science and Medicine in Sport
SN - 1440-2440
IS - 3
ER -