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. 2017 Jul 25;5(7):e97. doi: 10.2196/mhealth.7437

Table 3.

Maximal oxygen uptake (VO2Max) estimated from optical heart rate data and based on measured maximum heart rate value.

Performance metric All (N=24) Male (n=13) Female (n=11)
Bias (ml ·kg−1·min−1) −1.07 −1.28 −0.82
SDa (ml ·kg−1 ·min−1) 2.75 2.42 3.19
MAEb (ml ·kg−1·min−1) 2.39 2.29 2.51
MAPEc 5.2 4.7 5.8
Statistical test (P value) .06(Wd) .08(Te) .42(Te)
Correlation coefficient ρ=0.86, (P<.01)(Spf) r=.77, (P<.01) (Peg) r=.69, (P<.05) (Peg)

aSD: Standard deviation.

bMAE: Mean absolute error.

cMAPE: Mean absolute percentage error.

dW: Wilcoxon test.

eT: Paired t test.

fSp: Spearman correlation coefficient.

gPe: Pearson correlation coefficient.