Yonsei Med J.  2014 Jul;55(4):1145-1151. 10.3349/ymj.2014.55.4.1145.

Different Location of Triaxial Accelerometer and Different Energy Expenditures

• Kim DY
• Jung YS
• Park RW
• Joo NS

• KMID: 2130845
• DOI: http://doi.org/10.3349/ymj.2014.55.4.1145

Abstract

PURPOSE
We performed a study to determine the best appropriate wearing site of a triaxial accelerometer at different exercise speeds.
MATERIALS AND METHODS
We conducted an observational study with 66 healthy Korean adults (26 men and 40 women). Resting metabolic rate (RMR) before exercise, physical activity-related energy expenditure (PAEE) by cardiorespiratory gas analyzer and Signal Vector Magnitude (SVM) were measured while wearing four triaxial accelerometers on four different sites (wrist, waist, upper arm, and ankle) at exercise speeds from 2-10 km/h.
RESULTS
The mean RMR was 4.03 mL/kg/min and Actual METs (oxygen consumption at different exercise speeds divided by individual RMR) compared with the calculated METs (oxygen consumption divided by 3.5 mL/kg/min) showed relatively low value. The overall correlation between PAEE and SVM was highest when the accelerometer was worn on the wrist at low exercise speed (r=0.751, p<0.001), waist at a moderate speed (r=0.821, p<0.001), and ankle at a high speed (r=0.559, p<0.001). Using regression analysis, it was shown that the ankle at a low speed (R2=0.564, p<0.001), high speed (R2=0.559, p<0.001), and the waist at a moderate speed (R2=0.821, p<0.001) were the best appropriate sites.
CONCLUSION
When measuring the PAEE and SVM at different exercise speeds, the ankle in low and high exercise speed, and waist in moderate speed are the most appropriate sites for an accelerometer.

Keyword

Physical activity; energy expenditure; Signal Vector Magnitude; triaxial accelerometer

MeSH Terms

Adult
Anthropometry/*methods
Basal Metabolism/physiology
Energy Metabolism/*physiology
Exercise/*physiology
Female
Humans
Male
Middle Aged
Oxygen Consumption/physiology
Young Adult

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