Demura S, Yamaji S, Goshi F, Nagasawa Y
Faculty of Education, Kanazawa University, Japan.
J Sports Med Phys Fitness. 2002 Mar;42(1):38-44.
The purpose of this study was to clarify the influence of change of total body water caused by exercise and drinking, on relative body fat (%BF) based on three bioelectrical impedance analyses (BIA) methods, between hand and foot (H-F), between hand and hand (H-H), and between foot and foot (F-F).
The subjects were 30 Japanese healthy young adults aged 18 to 23 years (15 males, 15 females). Measurements were made three times for each BIA method; before and after exercise with sweat, and after drinking, and also twice according to the under water weighing (UW) method, before exercise and after drinking. A pedaling exercise, with a bicycle ergometer, was used for 60 minutes as the exercise.
The relationship of %BF between the UW method and each BIA method was mid-range or more (r=0.765-0.839). However, %BF based on the H-F and F-F BIA methods were higher than that based on the UW method. After drinking, %BF of all the BIA methods were higher than the UW method. %BF of the BIA methods after exercise indicated values lower than those before exercise. %BF of the H-F and H-H BIA methods after drinking were a little higher than those before exercise, indicating that those measurements reflect a slight change of body water.
It was demonstrated that %BF of any BIA method reflect the change of body water caused by exercise, sweating, and drinking.
本研究的目的是基于三种生物电阻抗分析（BIA）方法，即手足之间（H-F）、手与手之间（H-H）以及足与足之间（F-F），阐明运动和饮水引起的全身水分变化对相对体脂（%BF）的影响。
研究对象为30名18至23岁的日本健康年轻人（15名男性，15名女性）。每种BIA方法测量三次，分别在运动出汗前后以及饮水后进行测量，同时根据水下称重（UW）法在运动前和饮水后各测量两次。使用自行车测力计进行60分钟的蹬踏运动作为锻炼方式。
UW法与每种BIA方法之间的%BF关系处于中等或更高水平（r = 0.765 - 0.839）。然而，基于H-F和F-F BIA方法的%BF高于基于UW法的%BF。饮水后，所有BIA方法的%BF均高于UW法。运动后BIA方法的%BF值低于运动前。饮水后H-F和H-H BIA方法的%BF比运动前略高，表明这些测量反映了身体水分的轻微变化。
结果表明，任何BIA方法的%BF都反映了运动、出汗和饮水引起的身体水分变化。
