Conn C A, Schemmel R A, Smith B W, Ryder E, Heusner W W, Ku P K
Department of Health and Physical Education, Michigan State University, East Lansing.
Magnesium. 1988;7(1):27-36.
Twenty-two competitive swimmers (9 males, 13 females) were compared with 18 controls (11 males, 7 females) for body composition, intakes of selected nutrients, VO2max, hemoglobin, hematocrit and magnesium concentrations in plasma, erythrocytes and whole blood. Subjects ranged in age from 9.5 to 12.9 years. Male swimmers had 6.5% less body fat than did male controls (p less than 0.05) whereas there was no significant difference in body fat between female swimmers and controls. Energy, protein and magnesium intakes for swimmers and controls of the same gender were similar. VO2max was significantly higher in swimmers than in controls for both sexes. Magnesium concentrations in plasma, erythrocytes and whole blood were similar for swimmers and controls. However, concentrations of magnesium expressed as milligrams/deciliter in plasma were 8% higher in male swimmers than in female swimmers (p less than 0.05). There was a significant (p less than 0.05) positive correlation between plasma magnesium and VO2max in males, r = +0.42, but not in females.
将22名竞技游泳运动员（9名男性，13名女性）与18名对照组（11名男性，7名女性）在身体成分、特定营养素摄入量、最大摄氧量、血红蛋白、血细胞比容以及血浆、红细胞和全血中的镁浓度方面进行了比较。研究对象的年龄在9.5岁至12.9岁之间。男性游泳运动员的体脂比男性对照组少6.5%（p<0.05），而女性游泳运动员和对照组之间的体脂没有显著差异。相同性别的游泳运动员和对照组的能量、蛋白质和镁摄入量相似。男女游泳运动员的最大摄氧量均显著高于对照组。游泳运动员和对照组的血浆、红细胞和全血中的镁浓度相似。然而，以毫克/分升表示的血浆镁浓度，男性游泳运动员比女性游泳运动员高8%（p<0.05）。男性血浆镁与最大摄氧量之间存在显著的（p<0.05）正相关，r = +0.42，而女性则不存在。
