日本住了三周，HRV 明显提高。
查了下AI，偏寒冷且生活节律稳定的环境，更有利于自主神经系统恢复。
这么看，退休目的地优先考虑日本、北欧、澳洲这些地方。
PS：HRV 的长期改善，往往来自 环境温度降低 + 昼夜节律稳定 + 日常低强度活动增加 + 心理安全感提升 的叠加效应。

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I spent three weeks in Japan, and my HRV (Heart Rate of Change) improved significantly.

I looked up AI (Artificial Intelligence of Things), and it seems that colder environments with stable circadian rhythms are more conducive to the recovery of the autonomic nervous system.

Based on this, I'd prioritize Japan, Northern Europe, and Australia as retirement destinations.

PS: Long-term improvement in HRV often comes from the cumulative effect of lower ambient temperature + stable circadian rhythm + increased daily low-intensity activity + improved psychological safety.

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