Abstract
This study examined endurance performance and choice reaction time (CRT) in the heat following precooling via crushed ice ingestion. Prior to an 800 kJ cycle time trial (CTT) in hot and humid conditions (34.2 ± 0.9°C, 52.9 ± 8.1% Relative Humidity), nine male endurance athletes consumed either 7 g⋅kg−1 of water (CON) or crushed ice (ICE) in 30 min. A 4-CRT task was completed before, during and post the CTT. Core temperature (Tcore) was significantly lower after precooling with ICE (−0.6 ± 0.4°C, p = 0.002) but not CON (−0.2 ± 0.2°C; p = 0.083). Mean power output improved by 7.8% following ICE compared to CON (p = 0.011). Throughout the CTT, CRT significantly improved in both conditions (p = 0.036), and although no significant differences occurred between conditions (p = 0.421), a moderate effect at 800 kJ suggests that ICE was becoming faster (d = 0.56, 0.25–1.32 90% CI). Thermal sensation was lower with ICE (p ≤ 0.05); however, heart rate and perceived exertion were similar between conditions (p > 0.05). Ice ingestion significantly reduced Tcore coinciding with improved CTT performance. However, it remains equivocal whether ice ingestion is beneficial for decision-making during exercise in the heat. Abbreviations: Tbrain: Brain temperature; CRT: Choice reaction time; CI: Confidence interval; Tcore: Core temperature; CTT: Cycle time trial; MPO: Mean power output; RPE: Rating of perceived exertion; RPTS: Rating of perceived thermal sensation; RH: Relative humidity; USG: Urine specific gravity.
| Original language | English |
|---|---|
| Pages (from-to) | 393-401 |
| Number of pages | 9 |
| Journal | International Journal of Performance Analysis in Sport |
| Volume | 19 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 4 May 2019 |
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The effect of crushed ice ingestion on endurance performance and decision-making in hot and humid conditions. / Saldaris, Jacinta M.; Landers, Grant J.; Lay, Brendan S.
In: International Journal of Performance Analysis in Sport, Vol. 19, No. 3, 04.05.2019, p. 393-401.Research output: Contribution to journal › Article
TY - JOUR
T1 - The effect of crushed ice ingestion on endurance performance and decision-making in hot and humid conditions
AU - Saldaris, Jacinta M.
AU - Landers, Grant J.
AU - Lay, Brendan S.
PY - 2019/5/4
Y1 - 2019/5/4
N2 - This study examined endurance performance and choice reaction time (CRT) in the heat following precooling via crushed ice ingestion. Prior to an 800 kJ cycle time trial (CTT) in hot and humid conditions (34.2 ± 0.9°C, 52.9 ± 8.1% Relative Humidity), nine male endurance athletes consumed either 7 g⋅kg−1 of water (CON) or crushed ice (ICE) in 30 min. A 4-CRT task was completed before, during and post the CTT. Core temperature (Tcore) was significantly lower after precooling with ICE (−0.6 ± 0.4°C, p = 0.002) but not CON (−0.2 ± 0.2°C; p = 0.083). Mean power output improved by 7.8% following ICE compared to CON (p = 0.011). Throughout the CTT, CRT significantly improved in both conditions (p = 0.036), and although no significant differences occurred between conditions (p = 0.421), a moderate effect at 800 kJ suggests that ICE was becoming faster (d = 0.56, 0.25–1.32 90% CI). Thermal sensation was lower with ICE (p ≤ 0.05); however, heart rate and perceived exertion were similar between conditions (p > 0.05). Ice ingestion significantly reduced Tcore coinciding with improved CTT performance. However, it remains equivocal whether ice ingestion is beneficial for decision-making during exercise in the heat. Abbreviations: Tbrain: Brain temperature; CRT: Choice reaction time; CI: Confidence interval; Tcore: Core temperature; CTT: Cycle time trial; MPO: Mean power output; RPE: Rating of perceived exertion; RPTS: Rating of perceived thermal sensation; RH: Relative humidity; USG: Urine specific gravity.
AB - This study examined endurance performance and choice reaction time (CRT) in the heat following precooling via crushed ice ingestion. Prior to an 800 kJ cycle time trial (CTT) in hot and humid conditions (34.2 ± 0.9°C, 52.9 ± 8.1% Relative Humidity), nine male endurance athletes consumed either 7 g⋅kg−1 of water (CON) or crushed ice (ICE) in 30 min. A 4-CRT task was completed before, during and post the CTT. Core temperature (Tcore) was significantly lower after precooling with ICE (−0.6 ± 0.4°C, p = 0.002) but not CON (−0.2 ± 0.2°C; p = 0.083). Mean power output improved by 7.8% following ICE compared to CON (p = 0.011). Throughout the CTT, CRT significantly improved in both conditions (p = 0.036), and although no significant differences occurred between conditions (p = 0.421), a moderate effect at 800 kJ suggests that ICE was becoming faster (d = 0.56, 0.25–1.32 90% CI). Thermal sensation was lower with ICE (p ≤ 0.05); however, heart rate and perceived exertion were similar between conditions (p > 0.05). Ice ingestion significantly reduced Tcore coinciding with improved CTT performance. However, it remains equivocal whether ice ingestion is beneficial for decision-making during exercise in the heat. Abbreviations: Tbrain: Brain temperature; CRT: Choice reaction time; CI: Confidence interval; Tcore: Core temperature; CTT: Cycle time trial; MPO: Mean power output; RPE: Rating of perceived exertion; RPTS: Rating of perceived thermal sensation; RH: Relative humidity; USG: Urine specific gravity.
KW - choice reaction time
KW - cycle time trial
KW - Precooling
KW - thermoregulation
UR - http://www.scopus.com/inward/record.url?scp=85066458361&partnerID=8YFLogxK
U2 - 10.1080/24748668.2019.1613588
DO - 10.1080/24748668.2019.1613588
M3 - Article
VL - 19
SP - 393
EP - 401
JO - International Journal of Performance Analysis in Sport
JF - International Journal of Performance Analysis in Sport
SN - 1474-8185
IS - 3
ER -