生物电阻抗技术测体脂含量的利弊

jacky

Bioelectrical ImpedenceDescription: By standing barefoot on metal foot plates, an undetectably low voltage electric current is sent up one leg and down the other. Since fat is a very poor conductor of electricity, a lot of fat will impede the current more so than a lot of lean tissue. By measuring the resistance to the current, the machine estimates the percent body fat. How accurate is it? BIA accuracy, if done correctly on properly operating equipment, is approximately +/- 3%. However, accuracy is dependant upon several client-based variables. It is recommended the following guidelines be followed:

• Abstain from eating and drinking within 4 hours of the test
• Avoid exercising within 12 hours of the test
• Void (urinate) completely prior to testing
• Do not drink alcohol within 48 hours of the test
• Avoid taking diuretics prior to testing unless instructed by your physician
  

Advantages:

• Requires little or no technical knowledge of the operator or the client
• Testing itself takes less than a minute
• The unit can be easily transported from place to place
• Requires only an electrical outlet and the machine itself
  

Disadvantages:

• This method has a higher standard error range than most people desire
• Tends to consistently overestimate lean people and underestimate obese people
• The accuracy BIA does have is very dependant on multiple variables which may be hard to control for some people
  

Cost:

• BIA machines can be purchased for home use for anywhere between $100-$400.
• To be measured on a machine at a school or club, prices range from free to $30 per use.
  

Where Can I Have it Done?

• BIA is popular in health and fitness clubs due to its ease of operation.
• They may also be found at health fairs, schools or universities
  

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