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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 30°C, 30%RH until volitional exhaustion (or a maximum of 60 min). Every 15 minutes, participants ingested 3.2 mL·kg 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 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 (46.4±14.2 min) compared to NEU (32.7±11.5 min), despite a similar absolute Tre (NEU: 37.32±0.34°C; CLD: 37.28±0.26°C; P=0.44), change in Tre (NEU: 0.38±0.21°C; CLD: 0.34±0.24°C), absolute Tsk (NEU: 34.48±0.47°C; CLD: 34.44±0.54°C; P=0.82) and HR (NEU: 114±20 beats·min; CLD: 113±18 beats·min; 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.
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 30°C, 30%RH until volitional exhaustion (or a maximum of 60 min). Every 15 minutes, participants ingested 3.2 mL·kg 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 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 (46.4±14.2 min) compared to NEU (32.7±11.5 min), despite a similar absolute Tre (NEU: 37.32±0.34°C; CLD: 37.28±0.26°C; P=0.44), change in Tre (NEU: 0.38±0.21°C; CLD: 0.34±0.24°C), absolute Tsk (NEU: 34.48±0.47°C; CLD: 34.44±0.54°C; P=0.82) and HR (NEU: 114±20 beats·min; CLD: 113±18 beats·min; 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.