Correlation between the wrist-worn GENEA SVM_gs (g·min) and the energy expenditure (METs) along the 98 cardiopulmonary exercise tests.

Vertical lines delimited the different relative-intensity levels according to SVM_gs cut-points estimated, and horizontal lines delimited the different relative-intensity levels according to METs cut-points measured (equivalent to V̇O_2max classification). Grey regions delimit the consensus outcome between the measured and predicted intensity categories, and all observations inside these regions are correct classifications for each intensity level. SVMgs, signal magnitude vector gravity-subtracted. MET, metabolic equivalent task.