A-30 Free Communication/Poster - Exercise Expenditure and Weight Control: MAY 27, 2009 7:30 AM - 12:30 PM ROOM: Hall 4F
Validity Of Triaxial Accelerometer For Estimating Energy Expenditure In Non-athletes And Athletes: 1524Board #126 May 27 9:30 AM - 11:00 AM
PURPOSE: Energy requirements of athletes are dependent on daily activities as well as the practice quantity. Thus, the accurate estimation of 24-h total energy expenditure (TEE) of athletes is essential for sports nutritionists to assess energy balance. We examined the validity of a uniaxial accelerometer (ACCuni) and a newly developed triaxial accelerometer (ACCtri) for estimating 24-h TEE in non-athletes and long distance runners in comparison with doubly labeled water (DLW).
METHODS: A total of 15 young adults (18-34 years old) participated in this study. The TEE was measured using the DLW method over 7 and 14-day periods. The 18O and 2H dilution spaces and TBW were determined by dividing the dose of the tracer administered. The rate of CO2 production (rCO2) was determined and TEE (kcal day-1) was calculated using a modified Weir's formula based on rCO2 and the food quotient (FQ), which was calculated from the daily record of the food intake. ACCuni and ACCtri were worn were attached to an elastic belt and worn at the back of the waist for entire two weeks.
RESULTS: TEE estimated by ACCuni was significantly lower than TEE measure by DLW (2520 ± 681 kcal day-1) and showed wider limits of agreement. TEE estimated by ACCtri (2561 ± 543 kcal day-1) did not differ from TEE measured by DLW and showed narrower limits of agreement. No significant difference was observed between TEE estimated by ACCtri and TEE measured by DLW both in the long distance runners and non-athletes.
CONCLUSIONS: This study suggest the ACCtri could be applied to estimate the group mean of TEE in the long distance runners and to predict their energy requirements.
Supported by a research grant from the Ministry of Education, Culture, Sports, Science and Technology, Japan (18300218)© 2009 American College of Sports Medicine