A new study looking at stress in medical students found that, counterintuitively, the “stress hormone” known as cortisol appears higher during the laid-back summer months.

涓€闋呴嚌灏嶉啱(y墨)瀛�(xu茅)闄㈠(xu茅)鐢熷鍔涚殑鏂扮爺绌剁櫦(f膩)鐝�(xi脿n)锛岃垏鐩磋鎭版伆鐩稿弽锛岃绋辩偤鐨唱(zh矛)閱囩殑“澹撳姏婵€绱�”鍦ㄦ偁闁戠殑澶忓椤緱鏇撮珮銆�

Researchers at Poznan University of Medical Sciences in Poland looked at levels of cortisol — a hormone that is released into the bloodstream in response to stress and helps regulate blood sugar and salt — at different times of the year.

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They took saliva samples from medical students on two nonconsecutive days during the summer and did the same for two nonconsecutive winter days. Samples were collected for a full 24-hour period to analyze daily fluctuations in cortisol levels, which are typically higher in the morning. The study subjects tended to have higher cortisol levels in the summer.

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Dominika Kanikowska, lead author of the study, says more research is needed, but the results are surprising.

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“We of course know seasonality in animals,” she says. “But more and more results show that seasonality is also connected with human beings.”

濂硅锛�“鎴戝€戠暥(d膩ng)鐒剁煡閬撳嫊鐗╃殑瀛ｇ瘈(ji茅)鎬э紝浣嗚秺渚嗚秺澶氱殑鐮旂┒绲�(ji茅)鏋滆〃鏄�锛屽绡€(ji茅)鎬т篃鑸囦汉椤炴湁闂�(gu膩n)銆�”