UCT/MRC Research Unit for Exercise Science and Sports Medicine, Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa.
Clin J Sport Med. 2011 Jul;21(4):337-43. doi: 10.1097/JSM.0b013e31822148b8.
To determine if prerace to postrace changes in superior mesenteric artery (SMA) and coeliac artery hemodynamics were related to the development of gastrointestinal (GI) symptoms during a triathlon.
Prospective cohort study.
Field study at an international Ironman Triathlon.
Fifty-nine Ironman triathletes of whom 59% (n = 35) reported GI symptoms (GI group) during the race and 41% (n = 24) remained asymptomatic (CON group).
Prerace questionnaire (personal details, racing and training history, personal general medical history, and medication) and splanchnic hemodynamics.
Prerace and postrace measurements of splanchnic hemodynamics [artery diameter, systolic velocity, diastolic velocity, and resistive index (RI) of the SMA and coeliac artery] using duplex Doppler ultrasound.
There was a significant decrease in the diameter of the SMA after the race (P = 0.003) and a significant decrease in the RI of the SMA and coeliac artery (P < 0.001) in both the GI and CON groups, but there were no significant differences between the groups. The only significant risk factor for the development of GI symptoms was younger age (P = 0.041). Other risk factors, including high-intensity exercise, poorly trained athlete, and medication use, were not associated with the development of GI symptoms.
The hypothesis that altered blood flow is related to the development of GI symptoms in endurance athletes is not supported by the results of this study. Other mechanisms for GI symptoms associated with endurance exercise should be investigated.
确定肠系膜上动脉（SMA）和腹腔动脉血液动力学在铁人三项比赛前后的变化是否与胃肠道（GI）症状的发展有关。
前瞻性队列研究。
国际铁人三项赛的现场研究。
59 名铁人三项运动员，其中 59%（n=35）在比赛中报告有 GI 症状（GI 组），41%（n=24）无症状（CON 组）。
赛前问卷（个人详细信息、比赛和训练史、个人一般病史和药物治疗）和内脏血液动力学。
使用双功能多普勒超声测量赛前和赛后内脏血液动力学[SMA 和腹腔动脉的动脉直径、收缩期速度、舒张期速度和阻力指数（RI）]。
GI 组和 CON 组在比赛后 SMA 直径均显著减小（P=0.003），SMA 和腹腔动脉 RI 显著降低（P<0.001），但两组间无显著差异。发生 GI 症状的唯一显著危险因素是年龄较小（P=0.041）。其他危险因素，包括高强度运动、训练不佳的运动员和药物使用，与 GI 症状的发展无关。
血流改变与耐力运动员 GI 症状发展有关的假设未被本研究结果支持。应研究与耐力运动相关的 GI 症状的其他机制。
