Accuracy of energy expenditure estimation by activity monitors differs with ethnicity.

ABSTRACT

The aim of this project is to explore the accuracy of 2 activity monitors (SenseWear Armband & Actical) to estimate energy expenditure during rest and light to moderate intensity exercises in 2 ethnic groups. 18 Caucasian and 20 Black adults (age 26.8±5.2 years; body mass index 23.9±3.0 kg/m(2)) wore the 2 devices simultaneously during 3 standardised activities 30-min rest, 45-min of treadmill at 40% of their V˙O2peak and 45-min of stationary cycling at 50% of their V˙O2peak. Energy estimated with the 2 devices was compared to indirect calorimetry measurements. Both devices overestimated energy expenditure during rest (SenseWear 36% in Black vs. 16% in Caucasian; Actical 26% vs. 11%, p<0.01 between groups) and treadmill (SenseWear 50% vs. 25%; Actical 67% vs. 32%, p<0.01 between groups). Both devices significantly underestimated energy expenditure during stationary cycling (SenseWear 24% vs. 26%; Actical 58% vs. 70%, p=NS between groups). Equations used to estimate energy expenditure from accelerometer data is less precise among Black adults than Caucasian adults. Ethnic-specific formulas are probably required.