No Case of Exercise-Associated Hyponatremia in Male Ultra-Endurance Mountain Bikers in the 'Swiss Bike Masters'

被引:19
作者
Knechtle, Beat [1 ,2 ]
Knechtle, Patrizia
Rosemann, Thomas [2 ]
机构
[1] Gesundheitszentrum St Gallen, Facharzt FMH Allgemeinmed, CH-9001 St Gallen, Switzerland
[2] Univ Zurich, Inst Gen Practice & Hlth Serv Res, Zurich, Switzerland
来源
CHINESE JOURNAL OF PHYSIOLOGY | 2011年 / 54卷 / 06期
关键词
fluid intake; electrolyte disorder; plasma sodium; body mass changes; SERUM SODIUM CONCENTRATION; IRONMAN TRIATHLON; MARATHON RUNNERS; HYDRATION STATUS; WEIGHT CHANGES; FLUID BALANCE; RISK-FACTORS; RACE; SUPPLEMENTATION; ULTRAMARATHON;
D O I
10.4077/CJP.2011.AMM050
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Exercise-associated hyponatremia (EAH) has mainly been investigated in runners and triathletes. In mountain bikers, EAH was studied in two multi-stage races, but not in a single stage race. The aim of this study was to investigate the prevalence of EAH in a single-stage mountain bike ultra-marathon. In the 'Swiss Bike Masters' over 120 km with a climb of similar to 5,000 m in altitude, we determined pre and post race body mass, hematocrit, plasma sodium concentration ([Na+]), and urinary specific gravity in 37 cyclists. Athletes recorded their fluid intake while racing. No athlete developed EAH. The cyclists drank on average (means +/- SD) 0.7 +/- 0.2 l/h. Fluid intake was significantly and negatively related to race time (r = -0.41, P < 0.05), but showed no association with post race plasma [Na+], the change in plasma [Na+], post race body mass, or the change in body mass. The athletes lost 1.4 kg body mass (P < 0.05), plasma [Na+] decreased by 0.7% (P < 0.05), plasma volume increased by 1.4% and urinary specific gravity increased by 0.4% (P < 0.05). The change in body mass was neither related to post race plasma [Na+] nor to the change in plasma [Na+]. The decrease in plasma [Na+] was not related to fluid intake. The change in plasma [Na+] was related to post race plasma [Na+] (r = 0.40, P < 0.01). Ad libitum fluid intake showed no case of EAH in a single-stage mountain bike ultra-marathon. In contrast to previous findings, the faster athletes drank more than the slower ones.
引用
收藏
页码:379 / 384
页数:6
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