Continuous Glucose Monitoring During a 100-km Race: A Case Study in an Elite Ultramarathon Runner
Continuous Glucose Monitoring During a 100-km Race: A Case Study in an Elite Ultramarathon Runner
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DOI：
10.1123/ijspp.2013-0493
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发表时间：
2015-01-01
影响因子：
3.3
通讯作者：
Tokuyama, Kumpel
中科院分区：
文献类型：
--
作者：
Sengoku, Yasuo;Nakamura, Kazuteru;Tokuyama, Kumpel
本病例研究旨在使用连续血糖监测系统（CGMS）测量2名马拉松运动员在100公里比赛期间的血糖波动，并研究血糖曲线与跑步速度变化之间的关系。两名经验丰富的超级马拉松运动员参与了这项研究。在100 km比赛前35 h将CGMS葡萄糖传感器插入皮下腹部组织中，并连续监测葡萄糖曲线直至比赛结束。记录比赛中的速度和能量摄入。运动员A和B完成比赛的时间分别为6 h：51 min：17 s和8h：56 min：04 s，速度衰减率分别为17.6%和27.2%。在100公里比赛中，运动员A的平均相对强度为89.9% +/- 5.8%乳酸阈值（LT），运动员B为78.4% +/- 8.6% LT。在比赛期间，运动员A和B的碳水化合物摄入总量分别为249 g和366 g。尽管碳水化合物摄入量较低，但跑步者A在整个比赛中保持了正常的血糖水平，而跑步者B的血糖迅速下降，并在80公里后出现低血糖。这些结果表明，优秀的超级马拉松运动员可能有能力防止血糖水平大幅下降，无论在比赛期间摄入多少能量，以保持较高的相对跑步强度。
The current case study intended to measure blood glucose fluctuation in 2 marathon runners during a 100-km race using a continuous glucose-monitoring system (CGMS) and investigate the relationship between glucose profile and change in running speed. Two experienced ultramarathon runners participated in this study. A CGMS glucose sensor was inserted into the subcutaneous abdominal tissue at 35 h before the 100-km race, and the glucose profile was monitored continuously until the end of the race. Race pace and energy intake during the race were recorded. Participants finished the race in 6h:51min:17s (runner A) and 8h:56min:04s (runner B), and the race-pace decrement ratios were 17.6% for runner A and 27.2% for runner B. The average relative intensity throughout the 100-km race was 89.9% +/- 5.8% lactate threshold (LT) in runner A and 78.4% +/- 8.6% LT in runner B. The total amount of carbohydrate intake during the race was 249 g and 366 g in runners A and B, respectively. Despite lower carbohydrate intake, runner A maintained a normal glucose level throughout the race, while runner B rapidly decreased blood glucose and became hypoglycemic after the 80-km point. These results suggest that elite ultramarathon runners may have the ability to prevent a large decrement in blood glucose level regardless of the amount of energy intake during the race to maintain higher relative running intensity.