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. 2023 Jul 6;11:e43340. doi: 10.2196/43340

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©Xiaowei Ye, Mengjia Sun, Shiyong Yu, Jie Yang, Zhen Liu, Hailin Lv, Boji Wu, Jingyu He, Xuhong Wang, Lan Huang. Originally published in JMIR mHealth and uHealth (https://mhealth.jmir.org), 06.07.2023.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR mHealth and uHealth, is properly cited. The complete bibliographic information, a link to the original publication on https://mhealth.jmir.org/, as well as this copyright and license information must be included.

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(A) Distribution of the estimated maximum oxygen consumption measured by smartwatch test and cardiopulmonary exercise test based on the diagnosis of acute mountain sickness. (B) Diagram of the probability of acute mountain sickness occurrence for different ranges of the maximum oxygen consumption value at low altitude (blue: maximum oxygen consumption measured by cardiopulmonary exercise test; orange: maximum oxygen consumption measured by smartwatch test). **Significantly different between acute mountain sickness and non–acute mountain sickness at P<.01. AMS: acute mountain sickness; VO₂max-CPET: maximum oxygen consumption measured by cardiopulmonary exercise test; VO₂max-SWT: estimated maximum oxygen consumption by smartwatch test.