Supporting Data for: Physiological and cardiac rhythm responses during a maximal breath-hold in a world champion freediver

This dataset contains a two-lead electrocardiogram (ECG) printout collected during a dry, maximal voluntary breath-hold performed by a world champion freediver. The ECG recording captures the full duration of the breath-hold (6 minutes and 7 seconds), including both the easy-going phase (2 minutes and 20 seconds) and the struggle phase (3 minutes and 47 seconds), as well as pre- and post-breath-hold periods. The dataset was collected as part of a physiological case study investigating ventilatory, gas exchange, neuromuscular, oxygenation, and cardiac responses to prolonged breath-holding. During the struggle phase of the breath-hold, the ECG revealed transient, asymptomatic cardiac arrhythmias, including sinus-junctional rhythm competition, multiple supra- and ventricular extrasystoles, and marked bradycardia. Normal sinus rhythm resumed after breath-hold cessation. This dataset provides a manually verifiable reference of cardiac rhythm changes during the maximal voluntary breath-hold.

本数据集包含一份双导联心电图（electrocardiogram, ECG）打印记录，采集自一名世界冠军自由潜水员实施的干式最大自主屏气过程。本次ECG记录覆盖了本次屏气的完整时长（6分7秒），包含平稳阶段（2分20秒）与挣扎阶段（3分47秒），同时涵盖屏气前及屏气后的时段。本数据集采集自一项生理学案例研究，该研究旨在探究长时间屏气过程中的通气、气体交换、神经肌肉、氧合及心脏反应。在屏气的挣扎阶段，ECG记录显示存在一过性、无症状的心律失常，包括窦房结-交界区节律竞争、多发室上性及室性期前收缩，以及显著心动过缓。屏气结束后，正常窦性心律恢复。本数据集可为最大自主屏气过程中的心脏节律变化提供可人工验证的参考标准。