低剂量和正常剂量冰浆摄入对热环境中耐力和肠道上皮损伤的影响。
The effects of low and normal dose ice slurry ingestion on endurance capacity and intestinal epithelial injury in the heat.
机构信息
Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Human Potential Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
出版信息
J Sci Med Sport. 2023 Jun;26(6):278-284. doi: 10.1016/j.jsams.2023.04.008. Epub 2023 Apr 29.
OBJECTIVES
Compare the effects of ice slurry ingestion at low and normal doses on endurance capacity and exertional heat stress-induced gastrointestinal perturbations.
DESIGN
Randomised, cross-over design.
METHODS
Twelve physically active males completed four treadmill running trials, ingesting ice slurry (ICE) or ambient drink (AMB) at 2 g·kg (Normal; N) or 1 g·kg (Low; L) doses every 15-min during exercise and 8 g·kg (N) or 4 g·kg (L) pre- and post-exercise. Pre-, during and post-exercise serum intestinal fatty-acid binding protein ([I-FABP]) and lipopolysaccharide ([LPS]) concentrations were determined.
RESULTS
Pre-exercise gastrointestinal temperature (T) was lower in L + ICE than L + AMB (p < 0.05), N + ICE than N + AMB (p < 0.001) and N + ICE than L + ICE (p < 0.001). Higher rate of T rise (p < 0.05) and lower estimated sweat rate (p < 0.001) were observed in N + ICE than N + AMB. Rate of T rise was similar at low dose (p = 0.113) despite a lower estimated sweat rate in L + ICE than L+AMB (p < 0.01). Time-to-exhaustion was longer in L + ICE than L + AMB (p < 0.05), but similar between N + ICE and N + AMB (p = 0.142) and L + ICE and N + ICE (p = 0.766). [I-FABP] and [LPS] were similar (p > 0.05).
CONCLUSIONS
L + ICE elicited a lower heat dissipation compensatory effect with similar endurance capacity as N + ICE. Ice slurry conferred no protection against exertional heat stress-induced gastrointestinal perturbations.
目的
比较低剂量和正常剂量的冰浆摄入对耐力和运动性热应激引起的胃肠道紊乱的影响。
设计
随机交叉设计。
方法
12 名有体力活动的男性完成了 4 次跑步机跑步试验，在运动期间每 15 分钟摄入 2g·kg（正常；N）或 1g·kg（低；L）剂量的冰浆（ICE）或环境饮料（AMB），并在运动前和运动后摄入 8g·kg（N）或 4g·kg（L）。测定运动前、运动中和运动后血清肠脂肪酸结合蛋白（[I-FABP]）和脂多糖（[LPS]）浓度。
结果
低剂量+ICE 组的胃肠道温度（T）低于低剂量+AMB 组（p<0.05），N+ICE 组低于 N+AMB 组（p<0.001）和 N+ICE 组低于 L+ICE 组（p<0.001）。N+ICE 组的 T 上升率更高（p<0.05），估计出汗率更低（p<0.001）。尽管 L+ICE 组的估计出汗率低于 L+AMB 组（p<0.01），但低剂量时的 T 上升率相似（p=0.113）。L+ICE 组的疲劳时间长于 L+AMB 组（p<0.05），但 N+ICE 组与 N+AMB 组之间无差异（p=0.142），L+ICE 组与 N+ICE 组之间无差异（p=0.766）。[I-FABP]和[LPS]相似（p>0.05）。
结论
低剂量+ICE 引起的散热补偿效应较低，但与 N+ICE 组的耐力相似。冰浆不能防止运动性热应激引起的胃肠道紊乱。
Zotero 插件