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Old 11-22-2017, 02:51 PM
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Default STUDY: Cold-Water Ingestion Improves Exercise Tolerance of Heat-Sensitive MSers

Advice ActiveMSers has long promoted now has scientific backing. - D

Med Sci Sports Exerc. 2017 Nov 15. doi: 10.1249/MSS.0000000000001496. [Epub ahead of print]

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

Chaseling GK1, Filingeri D, Barnett M, Hoang P, Davis SL, Jay O.

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 (EDSS: 1-5); 10 age-matched healthy controls (CON)) cycled at ~40% VO2max at 30C, 30%RH until volitional exhaustion (or a maximum of 60 min). Every 15 minutes, participants ingested 3.2 mLkg of either 1.5C (CLD) or 37C (NEU) water. Rectal (Tre) temperature, mean skin (Tsk) temperature, and heart rate (HR) were measured throughout.

RESULTS:
All 10 CON, but only 3 of 10 MS participants completed 60 minutes of exercise in NEU trial. The remaining 7 MS participants all cycled longer (P=0.006) in CLD (46.414.2 min) compared to NEU (32.711.5 min), despite a similar absolute Tre (NEU: 37.320.34C; CLD: 37.280.26C; P=0.44), change in Tre (NEU: 0.380.21C; CLD: 0.340.24C), absolute Tsk (NEU: 34.480.47C; CLD: 34.440.54C; P=0.82) and HR (NEU: 11420 beatsmin; CLD: 11318 beatsmin; 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 core and mean skin temperatures or heart rate. 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.

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