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Bland-Altman plots between the estimated maximum oxygen consumption by smartwatch test and maximum oxygen consumption measured by cardiopulmonary exercise test at low altitude (A) and at high altitude (B). Mean biases (solid line), 95% limits of agreement (dashed line), and equality (dotted line) are also depicted. VO2max-CPET: maximum oxygen consumption measured by cardiopulmonary exercise test; VO2max-SWT: estimated maximum oxygen consumption by smartwatch test.
