Since the REE is the largest component of the TEE and
different methods and equations have been used to estimate
the REE in current years, we included REE estimations in the
same subjects as a reference. We found that the GEA, HarriseBenedict
equation and Cunningham equation used by
bioimpedance assessment (BIA) all yielded similar REE
estimates in middle-aged women and men. However, in young
women, the Cunningham equation (BIA) gave significantly
lower REE estimates than both GEA ( p ¼ 0.006) and the
HarriseBenedict equation ( p ¼ 0.011)(Table 2). The mean
difference between the GEA and Cunningham equation (BIA)
was 1.4 kcal/day, and the correlation was r2 ¼ 0.64
( p < 0.001, Fig. 1B).