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Ice slurry ingestion does not enhance self‐paced intermittent exercise in the heat
Author(s) -
Gerrett N.,
Jackson S.,
Yates J.,
Thomas G.
Publication year - 2017
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.12744
Subject(s) - sprint , ingestion , zoology , heart rate , medicine , thermal sensation , treadmill , environmental science , physical therapy , meteorology , blood pressure , thermal comfort , physics , biology
This study aimed to determine if ice slurry ingestion improved self‐paced intermittent exercise in the heat. After a familiarisation session, 12 moderately trained males (30.4 ± 3.4 year, 1.8 ± 0.1 cm, 73.5 ± 14.3 kg, V ˙ O 2max 58.5 ± 8.1 mL/kg/min) completed two separate 31 min self‐paced intermittent protocols on a non‐motorised treadmill in 30.9 ± 0.9 °C, 41.1 ± 4.0% RH . Thirty minutes prior to exercise, participants consumed either 7.5 g/kg ice slurry (0.1 ± 0.1 °C) ( ICE ) or 7.5 g/kg water (23.4 ± 0.9 °C) ( CONTROL ). Despite reductions in T c (Δ T c : −0.51 ± 0.3 °C, P < 0.05) and thermal sensation prior to exercise, ICE did not enhance self‐paced intermittent exercise compared to CONTROL . The average speed during the walk ( CONTROL : 5.90 ± 1.0 km, ICE : 5.90 ± 1.0 km), jog ( CONTROL : 8.89 ± 1.7 km, ICE : 9.11 ± 1.5 km), run ( CONTROL : 12.15 ± 1.7 km, ICE : 12.54 ± 1.5 km) and sprint ( CONTROL : 17.32 ± 1.3 km, ICE : 17.18 ± 1.4 km) was similar between conditions ( P > 0.05). Mean T sk , T b , blood lactate, heart rate and RPE were similar between conditions ( P > 0.05). The findings suggest that lowering T c prior to self‐paced intermittent exercise does not translate into an improved performance.