Cold Water Ingestion Improves Exercise Tolerance of Heat-Sensitive People with MS

Journal article


Georgia K. Chaseling, Davide Filingeri, Michael Barnett, Phu Hoang, Scott L. Davis and Ollie Jay. (2018). Cold Water Ingestion Improves Exercise Tolerance of Heat-Sensitive People with MS. Medicine and Science in Sports and Exercise. 50(4), pp. 643-649. https://doi.org/10.1249/MSS.0000000000001496
AuthorsGeorgia K. Chaseling, Davide Filingeri, Michael Barnett, Phu Hoang, Scott L. Davis and Ollie Jay
Abstract

Purpose
Heat intolerance commonly affects the exercise capacity of people with multiple sclerosis (MS) during bouts of hot weather. Cold water ingestion is a simple cooling strategy, but its efficacy for prolonging exercise capacity with MS remains undetermined. We sought to identify whether cold water ingestion blunts exercise-induced rises in body temperature and improves exercise tolerance in heat-sensitive individuals with MS.

Methods
On two separate occasions, 20 participants (10 relapsing–remitting MS (expanded disability status scale, 2–4.5); 10 age-matched healthy controls) cycled at ∼40% V˙O2max at 30°C and 30% relative humidity until volitional exhaustion (or a maximum of 60 min). Every 15 min, participants ingested 3.2 mL·kg−1 of either 1.5°C (CLD) or 37°C (NEU) water. Rectal (Tre) temperature, mean skin (Tsk) temperature, and heart rate (HR) were measured throughout.

Results
All 10 controls but only 3 of 10 MS participants completed 60 min of exercise in NEU trial. The remaining 7 MS participants all cycled longer (P = 0.006) in CLD (46.4 ± 14.2 min) compared with NEU (32.7 ± 11.5 min), despite a similar absolute Tre (NEU: 37.32°C ± 0.34°C; CLD: 37.28°C ± 0.26°C; P = 0.44), change in Tre (NEU: 0.38°C ± 0.21°C; CLD: 0.34°C ± 0.24°C), absolute Tsk (NEU: 34.48°C ± 0.47°C; CLD: 34.44°C ± 0.54°C; P = 0.82), and HR (NEU: 114 ± 20 bpm; CLD: 113 ± 18 bpm; P = 0.38) for the same exercise volume.

Conclusions
Cold water ingestion enhanced exercise tolerance of MS participants in the heat by ∼30% despite no differences in Tre, Tsk or HR. These findings support the use of a simple cooling strategy for mitigating heat intolerance with MS and lend insight into the potential role of cold-afferent thermoreceptors that reside in the abdomen and oral cavity in the modulation of exercise tolerance with MS in the heat.

Year2018
JournalMedicine and Science in Sports and Exercise
Journal citation50 (4), pp. 643-649
PublisherLippincott Williams & Wilkins
ISSN0195-9131
Digital Object Identifier (DOI)https://doi.org/10.1249/MSS.0000000000001496
Scopus EID2-s2.0-85044088438
Publisher's version
File Access Level
Controlled
Publication process dates
Deposited10 May 2021
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