Sweat iron and zinc losses during prolonged exercise
Sweat iron and zinc losses during prolonged exercise
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DOI：
10.1123/ijsnem.12.4.428
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发表时间：
2002-12-01
影响因子：
2.5
通讯作者：
Sharp, RG
中科院分区：
文献类型：
--
作者：
DeRuisseau, KC;Cheuvront, SN;Sharp, RG
本研究的目的是检查男性和女性的2小时运动回合对汗液铁和锌浓度和损失的影响。9名男性和9名女性休闲自行车运动员在温带环境（Ta = 23 ℃，RH = 51%）中以类似于50%VO2peak a的速度进行运动。在四次30分钟的运动中，每次收集15分钟的汗液样本。男性和女性的汗液铁或锌的浓度或损失之间没有显着差异。汗液铁浓度显着下降之间的60和90分钟的运动。出汗率显着增加，从30至60分钟，并保持不变，在第二个小时。运动后第二个小时的汗液铁流失量（0.042 mg/m2/h）显著低于运动后第一个小时的汗液铁流失量（0.060 mg/m2/h）。汗液锌浓度也显着下降超过2小时的运动回合。膳食铁和锌的摄入量与汗液铁和锌浓度没有显着相关性。在2小时的运动过程中，汗液中铁和锌的损失分别占男性和女性铁RDA的3%和1%，锌RDA的9%和8%。这些结果表明，可能的铁保护，防止在长时间的运动过度的铁损失。
The purpose of this study was to examine the effects of a 2-hour exercise bout on sweat iron and zinc concentrations and losses in males and females. Nine male and 9 female recreational cyclists exercised at similar to50% VO2peak a in a temperate environment (Ta = 23 degreesC, RH = 51%). Sweat samples were collected for 15 min during each of four 30-min exercise bouts. No significant differences were observed between males' and females' sweat iron or zinc concentrations or losses. Sweat iron concentrations decreased significantly between 60 and 90 min of exercise. Sweating rates increased significantly from 30 to 60 min and remained constant during the second hour. Sweat iron losses were significantly lower during the second hour (0.042 mg/m(2)/h) than the first hour of exercise (0.060 mg/m(2)/h). Sweat zinc concentrations also decreased significantly over the 2-hour exercise bout. Dietary intakes of iron and zinc were not significantly correlated to sweat iron and zinc concentrations. Sweat iron and zinc losses during 2 hours of exercise represented 3% and 1% of the RDA for iron and 9% and 8% of the RDA for zinc for men and women, respectively. These results suggest a possible iron conservation that prevents excessive iron loss during prolonged exercise.