Ice slurry ingestion as a cooling strategy in the heat

Osakabe, Jumpei; Matsumoto, Takaaki; Umemura, Yoshihisa

doi:10.7600/jpfsm.8.73

Cited by 3 publications

(3 citation statements)

References 35 publications

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“…The literature has shown the relevance of cooling strategies prior to exercise (pre-cooling) to limit the negative impact on aerobic performance [5][6][7][8]. Among these countermeasures, external (e.g., cooling vest, water immersion) and internal (e.g., drinking cold water/ice-slurry solution) cooling strategies mainly restrict the rise in body temperature and thereby increase the time to exhaustion [5,[8][9][10][11]. Wearing a cooling vest before exercise helps limit the core temperature increase [7,8,12,13] and improves the rating of perceived exertion (RPE) and thermal perceptions [13,14]-which, as behavioral controllers [15] can lead to a decrease in performance through an anticipatory and voluntary down-regulation of effort [16], thereby improving performance [6,8,12].…”

Section: Introductionmentioning

confidence: 99%

Cumulative pre-cooling methods do not enhance cycling performance in tropical climate

Collado,

Rinaldi,

Hermand

et al. 2023

PLoS ONE

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The main objective of this study was to investigate the effect of mixed cooling techniques (combination of internal and external strategies, with and without menthol) during warm-up for a time trial in tropical climate. Seven heat-acclimatized trained male road cyclists participated in three experimental sessions consisting of 20-min cycling performances on a velodrome track in ecological hot and humid conditions (Guadeloupe, French West Indies; WBGT: 27.64±0.27°C; relative humidity: 76.43±2.19%), preceded by a standardized 30-min warm-up and the ingestion of cold menthol water (1) with a cooling vest soaked in ice water (ICE-VEST), (2) with a cooling vest soaked in ice menthol water (MEN-VEST), and (3) without a vest (NO-VEST). Cycling performance (total distance, distance traveled per 2-min block), physiological parameters (core body temperature recorded, heart rate) and perceptions (exertion, thermal comfort, thermal sensation) were assessed. No between-condition differences were found for physiological parameters, the total covered distance or the distance traveled per 2-min block. However, distance traveled per 2-min decreased with time (p = 0.03), with no difference between conditions, suggesting a variation in pace during the cycling performance trial (e.g., mean±SD: 1321±48.01m at T2; 1308±46.20m at T8, 1284±78.38m at T14, 1309±76.29m at T20). No between-condition differences were found for perception of exertion, thermal comfort and thermal sensation during the warm-up (11.83±3.34; 2.58±1.02; 4.39±0.94, respectively) and the performance (17.85±0.99; 2.70±1.25; 5.20±1.20, respectively) but the pairwise comparisons within condition revealed a significant increase of TS values from T0 (4.57±1.13) to T20 (6.00±0.58) only in NO-VEST condition (p = 0.04). The absence of modification of thermal sensation at the end of the cycling test under the mixed conditions (ICE-VEST and MEN-VEST) suggests a beneficial effect of wearing a cooling vest on thermal sensation although it had no effect on performance.

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Section: Introductionmentioning

confidence: 99%

Cumulative pre-cooling methods do not enhance cycling performance in tropical climate

Collado,

Rinaldi,

Hermand

et al. 2023

PLoS ONE

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“…Several cooling techniques have been attempted to achieve improved exercise performance, including immersion in cold water [7][8][9], and use of ice jackets and ice packs [8,10,11]. Recently, intake of ice slurry has drawn attention as an efficient method to obtain internal cooling without excessive reduction of the muscle temperature in hot environments [12,13].…”

Section: Introductionmentioning

confidence: 99%

Ice slurry ingestion improves physical performance during high-intensity intermittent exercise in a hot environment

et al. 2022

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Ice slurry ingestion enhances exercise performance by lowering the core body temperature. However, an operational issue related to this ingestion is the requirement for a high intake of 7.5 g·kg -1 to produce the desired effects. We investigated the effects of the intake of low amounts of ice slurry at −2°C on the tympanic temperature and exercise performance during repeated high-intensity intermittent exercises in a hot environment. This study was a randomized, crossover study, with a 6-day washout period. Twelve university rugby union players performed two 30-min sessions of high-intensity intermittent exercises separated by a 15-min half-time break on a cycle ergometer in a hot environment (28.8°C ± 0.1°C, 49.5% ± 0.6% relative humidity). The participants ingested 450 g of −2°C-ice slurry (ICE), or a 30°C-beverage (CON) having the same composition as ICE, or 30°C-water (WAT) during the half-time break. The tympanic temperature and skin temperature were measured as the physiological data, and the peak power and mean power as the exercise performance data. The tympanic temperature at the half-time break and beginning of the 2 nd session was significantly lower in the ICE group as compared with the CON and WAT groups. The skin temperature at the half-time break was significantly lower in the ICE group as compared with the WAT group. While the peak power and mean power during the 2 nd session were significantly greater in the ICE group as compared with the CON and WAT groups. Our findings suggest that even the intake of lower amounts, as compared with those used in previous studies, of low-temperature ice slurry can reduce the body temperature and improve the peak power. These results suggest that intake of low-temperature ice slurry as a strategy for internal body cooling is useful for improving endurance exercise performance in hot environments.

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“…Changing the physical state of water from the solid state to the liquid state requires a large transfer of heat energy. Accordingly, ice slurry provides a greater cooling effect than liquid water alone [15,16]. It has been reported that ingestion of 2 to 7.5 g/kg body mass of ice slurry attenuated the rise in the core body temperature during exercise [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ingestion of Ice Slurry on the Sleep Quality of Rugby Union Players in the Summer Season

et al. 2022

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The aim of this study was to investigate the effect of ingestion of ice slurry before bedtime on the sleep quality of rugby union players in the summer season. Thirteen healthy male university rugby union players volunteered for this study. The participants ingested either ice slurry or a room-temperature beverage (control) 30 min before bedtime. A wearable activity-based sleep monitor was used to analyze objective sleep parameters, and the subjective sleep scores were assessed using the Oguri–Shirakawa–Azumi Sleep Inventory, middle-aged and aged version (OSA-MA). No differences in the amount or efficiency of sleep were observed between the ice slurry/control beverage conditions. Significant shortening of the sleep latency was observed in the ice slurry condition as compared with the control beverage condition. Moreover, significant improvement of the subjective sleep score for “feeling refreshed” on the OSA-MA was observed in the ice slurry condition. There were no significant differences in the other subjective sleep scores between the two conditions. The results suggest that ice slurry ingestion before bedtime may improve the latency of sleep onset, accelerate recovery from fatigue, and be useful as a sleep improvement strategy in rugby union players engaging in exercises during the summer season.

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Ice slurry ingestion as a cooling strategy in the heat

Cited by 3 publications

References 35 publications

Cumulative pre-cooling methods do not enhance cycling performance in tropical climate

Cumulative pre-cooling methods do not enhance cycling performance in tropical climate

Ice slurry ingestion improves physical performance during high-intensity intermittent exercise in a hot environment

Effect of Ingestion of Ice Slurry on the Sleep Quality of Rugby Union Players in the Summer Season

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