Ice Slurry Ingestion and Physiological Strain During Exercise in Non-Compensable Heat Stress

Ng, Jason; Wingo, Jonathan E.; Bishop, Phillip A.; Casey, Jason C.; Aldrich, Elizabeth K

doi:10.3357/amhp.4975.2018

Cited by 10 publications

(5 citation statements)

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“… 24 It was also reported that ice slurry ingestion during exercise wearing fireproof clothing suppressed the elevation in T re . 33 In our experiments, the elevations of

and T int were significantly suppressed for approximately 30 minutes after the start of exercise in the ICE condition. It has been demonstrated that

and T int reflect dynamic changes in contrast with T re , which might have affected the results.…”

Section: Discussionsupporting

confidence: 48%

Efficacy of ice slurry and carbohydrate–electrolyte solutions for firefighters

Tabuchi

Horie

Kawanami

et al. 2021

Journal of Occupational Health

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Objectives To examine the thermoregulatory and fluid‐electrolyte responses of firefighters ingesting ice slurry and carbohydrate–electrolyte solutions before and after firefighting operations. Methods Twelve volunteer firefighters put on fireproof clothing and ingested 5 g/kg of beverage in an anteroom at 25°C and 50% relative humidity (RH; pre‐ingestion), and then performed 30 minutes of exercise on a cycle ergometer (at 125 W for 10 minutes and then 75 W for 20 minutes) in a room at 35℃ and 50% RH. The participants then returned to the anteroom, removed their fireproof clothing, ingested 20 g/kg of beverage (post‐ingestion), and rested for 90 minutes. Three combinations of pre‐ingestion and post‐ingestion beverages were provided: a 25℃ carbohydrate–electrolyte solution for both (CH condition); 25℃ water for both (W condition); and a −1.7℃ ice slurry pre‐exercise and 25℃ carbohydrate–electrolyte solution post‐exercise (ICE condition). Results The elevation of body temperature during exercise was lower in the ICE condition than in the other conditions. The sweat volume during exercise was lower in the ICE condition than in the other conditions. The serum sodium concentration and serum osmolality were lower in the W condition than in the CH condition. Conclusions The ingestion of ice slurry while firefighters were wearing fireproof clothing before exercise suppressed the elevation of body temperature during exercise. Moreover, the ingestion of carbohydrate–electrolyte solution by firefighters after exercise was useful for recovery from dehydration.

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“… 24 It was also reported that ice slurry ingestion during exercise wearing fireproof clothing suppressed the elevation in T re . 33 In our experiments, the elevations of

and T int were significantly suppressed for approximately 30 minutes after the start of exercise in the ICE condition. It has been demonstrated that

and T int reflect dynamic changes in contrast with T re , which might have affected the results.…”

Section: Discussionsupporting

confidence: 48%

Efficacy of ice slurry and carbohydrate–electrolyte solutions for firefighters

Tabuchi

Horie

Kawanami

et al. 2021

Journal of Occupational Health

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“…Our search identified 558 abstracts. Initially, 101 reports seemed possibly relevant, but after a thorough full-text review, only 47 studies were included ( Lee and Shirreffs, 2007 ; Lee et al, 2008 ; Lee et al, 2008 ; Burdon et al, 2010 ; Ihsan et al, 2010 ; Stanley et al, 2010 ; Byrne et al, 2011 ; Siegel et al, 2011 ; Bain et al, 2012 ; Siegel et al, 2012 ; Burdon et al, 2013 ; Hue et al, 2013 ; Brade et al, 2014 ; Morris et al, 2014 ; Burdon et al, 2015 ; Hue et al, 2015 ; James et al, 2015 ; Lamarche et al, 2015 ; Pryor et al, 2015 ; Schulze et al, 2015 ; Zimmermann and Landers, 2015 ; Hailes et al, 2016 ; Morris et al, 2016 ; Stevens et al, 2016 ; Tay et al, 2016 ; Flood et al, 2017 ; Gerrett et al, 2017 ; Takeshima et al, 2017 ; Zimmermann et al, 2017 ; Zimmermann et al, 2017 ; Jeffries et al, 2018 ; Ng et al, 2018 ; Snipe and Costa, 2018 ; Watkins et al, 2018 ; Aldous et al, 2019 ; Gibson et al, 2019 ; Ng et al, 2019 ; Thomas et al, 2019 ; Iwata et al, 2020 ; Naito et al, 2020 ; Nakamura et al, 2020 ; Onitsuka et al, 2020 ; Saldaris et al, 2020 ; Alhadad et al, 2021 ; Gavel et al, 2021 ; Parton et al, 2021 ; Tabuchi et al, 2021 ). The kappa value of 0.76 for the agreement between the two researchers assessing the eligibility of records was considered to reflect a “substantial” agreement ( Orwin et al, 1994 ).…”

Section: Resultsmentioning

confidence: 99%

Effects of internal cooling on physical performance, physiological and perceptional parameters when exercising in the heat: A systematic review with meta-analyses

et al. 2023

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Background: An elevated core temperature (Tcore) increases the risk of performance impairments and heat-related illness. Internal cooling (IC) has the potential to lower Tcore when exercising in the heat. The aim of the review was to systematically analyze the effects of IC on performance, physiological, and perceptional parameters.Methods: A systematic literature search was performed in the PubMed database on 17 December 2021. Intervention studies were included assessing the effects of IC on performance, physiological, or perceptional outcomes. Data extraction and quality assessment were conducted for the included literature. The standardized mean differences (SMD) and 95% Confidence Intervals (CI) were calculated using the inverse-variance method and a random-effects model.Results: 47 intervention studies involving 486 active subjects (13.7% female; mean age 20–42 years) were included in the meta-analysis. IC resulted in significant positive effects on time to exhaustion [SMD (95% CI) 0.40 (0.13; 0.67), p < 0.01]. IC significantly reduced Tcore [−0.19 (22120.34; −0.05), p < 0.05], sweat rate [−0.20 (−0.34; −0.06), p < 0.01], thermal sensation [−0.17 (−0.33; −0.01), p < 0.05], whereas no effects were found on skin temperature, blood lactate, and thermal comfort (p > 0.05). IC resulted in a borderline significant reduction in time trial performance [0.31 (−0.60; −0.02), p = 0.06], heart rate [−0.13 (−0.27; 0.01), p = 0.06], rate of perceived exertion [−0.16 (−0.31; −0.00), p = 0.05] and borderline increased mean power output [0.22 (0.00; 0.44), p = 0.05].Discussion: IC has the potential to affect endurance performance and selected physiological and perceptional parameters positively. However, its effectiveness depends on the method used and the time point of administration. Future research should confirm the laboratory-based results in the field setting and involve non-endurance activities and female athletes.Systematic review registration:https://www.crd.york.ac.uk/PROSPERO/, identifier: CRD42022336623.

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“…The authors suggested the possibility that ice slurry ingestion provided a sufficient heat sink to decrease heat storage and thereby reduce cardiovascular strain [ 32 ]. The other study also reported that ice slurry ingestion during walking at 4.0 km·h −1 on a 12% incline wearing firefighter-protective clothing decreased HR by approximately 10 bpm at 5 min of the commencement of walking compared to cold fluid [ 33 ]. However, this is only speculative, and further research is warranted to investigate the mechanism of the decrease in HR following ice slurry ingestion.…”

Section: Discussionmentioning

confidence: 99%

Effects of ice slurry ingestion on body temperature and softball pitching performance in a hot environment: a randomized crossover trial

Numata

Yanaoka

Kurosaka

et al. 2023

J Physiol Anthropol

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Background Although softball players are often required to play in hot environments, scarce evidence is available regarding the effects of ice slurry ingestion on body temperature and pitching performance in softball pitchers in a hot environment. Thus, this study investigated the effects of ice slurry ingestion before and between innings on body temperature and softball pitching performance in a hot environment. Methods In a randomized crossover design, seven heat-acclimatized amateur softball pitchers (four males and three females) completed simulated softball games consisting of 15 best-effort pitches per inning for seven innings with between-pitch rest intervals of 20 s. Participants were assigned to either a control trial (CON: ingestion of 5.0 g·kg−1 of cool fluid [9.8 ± 2.2 °C] before simulated softball games and 1.25 g·kg−1 of cool fluid between inning intervals) or an ice trial (ICE: ingestion of ice slurry [− 1.2 ± 0.1 °C] based on the same timings and doses as the CON). Participants performed both trials in an outdoor ground during the summer season (30.8 ± 2.7 °C, 57.0 ± 7.9% relative humidity). Results Ice slurry ingestion before the simulated softball game (pre-cooling) resulted in a greater reduction in rectal temperature compared with cool fluid ingestion (p = 0.021, d = 0.68). No significant differences were observed between the trials in rectal temperature changes during the simulated softball game (p > 0.05). Compared to the CON, heart rate during the game was significantly decreased (p < 0.001, d = 0.43), and handgrip strength during the game was significantly increased (p = 0.001, d = 1.16) in the ICE. Ratings of perceived exertion, thermal comfort, and thermal sensation were improved in the ICE compared to those in the CON (p < 0.05). Ball velocity and pitching accuracy were not affected by ICE. Conclusions Ice slurry ingestion before and between innings reduced thermal, cardiovascular, and perceptual strain. However, it did not affect softball pitching performance compared to cool fluid ingestion.

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Ice Slurry Ingestion and Physiological Strain During Exercise in Non-Compensable Heat Stress

Cited by 10 publications

References 0 publications

Efficacy of ice slurry and carbohydrate–electrolyte solutions for firefighters

Efficacy of ice slurry and carbohydrate–electrolyte solutions for firefighters

Effects of internal cooling on physical performance, physiological and perceptional parameters when exercising in the heat: A systematic review with meta-analyses

Effects of ice slurry ingestion on body temperature and softball pitching performance in a hot environment: a randomized crossover trial

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