Effects of Hot Night Exposure on Human Semen Quality: A Multicenter Population-Based Study.

Biomedical and environmental sciences : BES Pub Date : 2025-02-20 DOI:10.3967/bes2024.131

Ting Ting Dai, Ting Xu, Qi Ling Wang, Hao Bo Ni, Chun Ying Song, Yu Shan Li, Fu Ping Li, Tian Qing Meng, Hui Qiang Sheng, Ling Xi Wang, Xiao Yan Cai, Li Na Xiao, Xiao Lin Yu, Qing Hui Zeng, Pi Guo, Xin Zong Zhang

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Abstract

Objective: To explore and quantify the association of hot night exposure during the sperm development period (0-90 lag days) with semen quality.

Methods: A total of 6,640 male sperm donors from 6 human sperm banks in China during 2014-2020 were recruited in this multicenter study. Two indices (i.e., hot night excess [HNE] and hot night duration [HND]) were used to estimate the heat intensity and duration during nighttime. Linear mixed models were used to examine the association between hot nights and semen quality parameters.

Results: The exposure-response relationship revealed that HNE and HND during 0-90 days before semen collection had a significantly inverse association with sperm motility. Specifically, a 1 °C increase in HNE was associated with decreased sperm progressive motility of 0.0090 (95% confidence interval [ CI]: -0.0147, -0.0033) and decreased total motility of 0.0094 (95% CI: -0.0160, -0.0029). HND was significantly associated with reduced sperm progressive motility and total motility of 0.0021 (95% CI: -0.0040, -0.0003) and 0.0023 (95% CI: -0.0043, -0.0002), respectively. Consistent results were observed at different temperature thresholds on hot nights.

Conclusion: Our findings highlight the need to mitigate nocturnal heat exposure during spermatogenesis to maintain optimal semen quality.

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热夜暴露对人类精液质量的影响：一项多中心人群研究。

目的：探讨和量化精子发育期间（0 ~ 90滞后日）热夜暴露与精液质量的关系。方法：在这项多中心研究中，从2014-2020年中国6个人类精子库中招募了6640名男性捐精者。采用热夜过量（HNE）和热夜持续时间（HND）两个指标来估计夜间的热强度和持续时间。使用线性混合模型来检验热夜与精液质量参数之间的关系。结果：暴露-反应关系显示，采精前0 ~ 90天HNE和HND与精子活力呈显著负相关。具体来说，HNE升高1°C与精子进行性运动能力下降0.0090（95%可信区间[CI]: -0.0147, -0.0033）和总运动能力下降0.0094 （95% CI: -0.0160, -0.0029）相关。HND与精子进行性运动能力和总运动能力降低显著相关，分别为0.0021 （95% CI: -0.0040, -0.0003）和0.0023 （95% CI: -0.0043, -0.0002）。在热夜不同温度阈值下观察到一致的结果。结论：我们的研究结果强调了在精子发生过程中减少夜间热暴露以保持最佳精液质量的必要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Biomedical and environmental sciences : BES

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