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首页> 外文期刊>Journal of athletic training >Influence of hydration on physiological function and performance during trail running in the heat.
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Influence of hydration on physiological function and performance during trail running in the heat.

机译：水化对热轧行驶期间生理功能和性能的影响。

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CONTEXT: Authors of most field studies have not observed decrements in physiologic function and performance with increases in dehydration, although authors of well-controlled laboratory studies have consistently reported this relationship. Investigators in these field studies did not control exercise intensity, a known modulator of body core temperature. OBJECTIVE: To directly examine the effect of moderate water deficit on the physiologic responses to various exercise intensities in a warm outdoor setting. DESIGN: Semirandomized, crossover design. SETTING: Field setting. Patients or Other PARTICIPANTS: Seventeen distance runners (9 men, 8 women; age = 27 +/- 7 years, height = 171 +/- 9 cm, mass = 64.2 +/- 9.0 kg, body fat = 14.6% +/- 5.5%). INTERVENTION(S): Participants completed four 12-km runs (consisting of three 4-km loops) in the heat (average wet bulb globe temperature = 26.5 degrees C): (1) a hydrated, race trial (HYR), (2) a dehydrated, race trial (DYR), (3) a hydrated, submaximal trial (HYS), and (4) a dehydrated, submaximal trial (DYS). Main Outcome Measure(s): For DYR and DYS trials, dehydration was measured by body mass loss. In the submaximal trials, participants ran at a moderate pace that was matched by having them speed up or slow down based on pace feedback provided by researchers. Intestinal temperature was recorded using ingestible thermistors, and participants wore heart rate monitors to measure heart rate. RESULTS: Body mass loss in relation to a 3-day baseline was greater for the DYR (-4.30% +/- 1.25%) and DYS trials (-4.59% +/- 1.32%) than for the HYR (-2.05% +/- 1.09%) and HYS (-2.0% +/- 1.24%) trials postrun (P < .001). Participants ran faster for the HYR (53.15 +/- 6.05 minutes) than for the DYR (55.7 +/- 7.45 minutes; P < .01), but speed was similar for HYS (59.57 +/- 5.31 minutes) and DYS (59.44 +/- 5.44 minutes; P > .05). Intestinal temperature immediately postrun was greater for DYR than for HYR (P < .05), the only significant difference. Intestinal temperature was greater for DYS than for HYS postloop 2, postrun, and at 10 and 20 minutes postrun (all: P < .001). Intestinal temperature and heart rate were 0.22 degrees C and 6 beats/min higher, respectively, for every additional 1% body mass loss during the DYS trial compared with the HYS trial. CONCLUSIONS: A small decrement in hydration status impaired physiologic function and performance while trail running in the heat.
机译：背景信息：大多数现场研究的作者未观察到生理功能和性能下降，否则脱水的增加，尽管受控实验室研究的作者一直报告这种关系。这些实地研究中的调查人员没有控制运动强度，是身体核心温度的已知调节剂。目的：直接检验中度水赤字对温暖户外环境中各种运动强度的生理反应的影响。设计：Semirandomized，交叉设计。设置：字段设置。患者或其他参与者：十七次距离跑步者（9名男子，8名女性;年龄= 27 +/- 7年，高度= 171 +/- 9厘米，质量= 64.2 +/- 9.0公斤，体脂= 14.6％+/- 5.5％）。干预：参与者在热量（平均湿灯泡全球温度= 26.5℃）：（1）水合，种族试验（HYR），（2 ）脱水，种族试验（DYR），（3）水合，潜水试验（HYS），和（4）脱水，潜血症试验（DYS）。主要结果措施：对于DYR和DYS试验，通过体重损失测量脱水。在潜冲试验中，参与者以适度的速度运行，通过使它们加速或基于研究人员提供的速度反馈来速度匹配。使用可摄入热敏电阻记录肠温度，参与者穿过心率监测器来测量心率。结果：与3天的3天基线有关的体重损失（-4.30％+/- 1.25％）和DYS试验（-4.59％+/- 1.32％）比HYR（-2.05％+ / - 1.09％）和HYS（-2.0％+/- 1.24％）试验POSTRUN（P <.001）。参与者对HYR（53.15 +/- 6.05分钟更快）比DYR（55.7 +/- 7.45分钟; P <.01），但速度类似于HYS（59.57 +/- 5.31分钟）和DYS（59.44 +/- 5.44分钟; p> .05）。肠道温度立即对DYR的postrun比hyr（p <.05），唯一的显着差异。对于多年的Hys Postloop 2，Postrun和10和20分钟Postrun（全部：P <.001），肠道温度越大。与HYS试验相比，肠道温度和心率分别分别为0.22℃，6°C和6次/分钟，每次额外1％的体重损失。结论：水合地位略有削减，生理功能和性能受损，而在热量中运行。

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