Division of Nutrition, Defense Institute of Physiology and Allied Sciences, Delhi, India.
Division of Nutrition, Defense Institute of Physiology and Allied Sciences, Delhi, India -
J Sports Med Phys Fitness. 2021 Sep;61(9):1273-1280. doi: 10.23736/S0022-4707.21.11647-0. Epub 2021 Jan 20.
Physical activity related energy expenditure, environmental stresses, body composition, dietary intake, etc., are key factors influencing the nutritional requirements of minerals. The present study was designed to study the nutritional status of metals with respect to extensive endurance training.
The participants of the study were navy sailors (N.=37, mean age±SD: 25.2±4.8 y) undergoing one month of endurance training. Nutritional status was assessed by determining their body composition using bioelectrical impedance (BIA), food intake and urinary excretion levels. Fasting blood samples were taken to separate plasma and red blood cells for analysis of copper, zinc, magnesium and iron and certain metal dependent enzymatic biomarkers.
Endurance training significantly decreased the plasma levels of copper (P<0.01), zinc and iron (P<0.05) while in erythrocytes a significant (P<0.001) decrease was observed only for Mg and Zn. There was a concomitant increase (P<0.05) in urinary Zn excretion. In addition, the concentrations of certain metal dependent enzymatic biomarkers like RBC metallothionein (P<0.05) and carbonic anhydrase (P<0.01) (Zn biomarker), plasma ferritin (Fe biomarker) (P<0.001) and RBC Mg ATPase (Mg biomarker) (P<0.05) decreased after physical activity.
The findings of the present study suggested the increased requirements of these minerals during physical activity.
与体力活动相关的能量消耗、环境压力、身体成分、饮食摄入等，都是影响矿物质营养需求的关键因素。本研究旨在研究与长期耐力训练相关的金属营养状况。
研究对象为进行一个月耐力训练的海军水手（N=37，平均年龄±SD：25.2±4.8 岁）。通过生物电阻抗（BIA）测定身体成分、饮食摄入和尿排泄水平来评估营养状况。抽取空腹血样，分离血浆和红细胞，用于分析铜、锌、镁和铁以及某些金属依赖性酶生物标志物。
耐力训练显著降低了血浆铜（P<0.01）、锌和铁（P<0.05）水平，而红细胞中仅镁和锌显著降低（P<0.001）。尿锌排泄量也随之增加（P<0.05）。此外，某些金属依赖性酶生物标志物如 RBC 金属硫蛋白（P<0.05）和碳酸酐酶（P<0.01）（锌标志物）、血浆铁蛋白（Fe 标志物）（P<0.001）和 RBC Mg-ATP 酶（Mg 标志物）（P<0.05）在体力活动后浓度降低。
本研究结果表明，在体力活动期间这些矿物质的需求量增加。
