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The Application of the Accelerometer to Measure the Physical Activity Energy Accelerometer : The Reliability and Validity
The main purpose of this article is to collect and review literature about the accelerometer which is used to measure physical activity level and energy consumption in human. This article also examined the methods of reliability and validity. Physical activity questionnaire is a less expensive and a more simple method to measure the physical activity from a large sample of population; however, the physical activity questionnaire, due to the cognitive functions and memory abilities of subjects’ physical activity, would produce measurement errors. On the other hand, the accelerometer, compared to the physical activity questionnaire, is a relatively objective physical activity measurement instrument, and possesses a fair degree of validity and reliability; coupled with advances in technology, the accelerometer smaller in size, so that it can be worn on different parts of the body to measure body activity and energy consumption. There are many researches that support the fact that the accelerometer should be worn on waist or lower back so that it can measure physical activity more accurately. However, besides the waist and lower back, many studies have tried to use the accelerometer to measure physical expenditure in the different sports. In addition, the accelerometers measurement of physical activity may be a factor of: participants forgetting to wear certain parts, wear and tear, misuse, being touched inappropriately, equipment switch, and batteries loss causing data loss. Further studies can explore the reliability and validity accelerometer with different sports, different ethnic groups, and different ways of wearing the parts in physical activity; this can increase its applications in daily life and specific sports.
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