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人体肺活量衰减始于 20-25 岁

2025-05-20 14:44 by 时间的地图

一项研究首次揭示了肺活量从童年到老年的演变过程。学术界此前认为,人体肺功能在20至25岁达到顶峰,之后趋于稳定,并于成年后期随着肺部衰老而开始衰退。然而,这一模型是基于并未覆盖全生命周期的研究建立的。相比之下,新研究采用了“加速队列设计”,即将多项队列研究数据整合以覆盖所需年龄范围。研究显示,肺功能存在两个发展阶段——童年期的快速增长阶段,以及延续至肺功能峰值前的缓慢增长阶段。研究使用两个参数评估肺功能:第一秒用力呼气容积(FEV1)——深吸气后第一秒呼出的气体量,以及用力肺活量(FVC)——深吸气后无时间限制的最大呼气量。女性在20岁左右FEV1达到峰值,男性则在23岁左右。出人意料的是,研究发现,峰值后并不存在稳定期。分析表明,持续性哮喘和吸烟都会影响肺功能,但方式与既往认知不同。持续性哮喘患者会更早达到FEV1峰值且终生处于较低水平,而吸烟者从35岁开始出现更快的肺功能下降。

doi.org/10.1016/S2213-2600(25)00043-8
中国科学报:肺活量衰减始于20至25岁

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人体肺活量衰减始于 20-25 岁

2025-05-20 14:44 by 时间的地图

一项研究首次揭示了肺活量从童年到老年的演变过程。学术界此前认为,人体肺功能在20至25岁达到顶峰,之后趋于稳定,并于成年后期随着肺部衰老而开始衰退。然而,这一模型是基于并未覆盖全生命周期的研究建立的。相比之下,新研究采用了“加速队列设计”,即将多项队列研究数据整合以覆盖所需年龄范围。研究显示,肺功能存在两个发展阶段——童年期的快速增长阶段,以及延续至肺功能峰值前的缓慢增长阶段。研究使用两个参数评估肺功能:第一秒用力呼气容积(FEV1)——深吸气后第一秒呼出的气体量,以及用力肺活量(FVC)——深吸气后无时间限制的最大呼气量。女性在20岁左右FEV1达到峰值,男性则在23岁左右。出人意料的是,研究发现,峰值后并不存在稳定期。分析表明,持续性哮喘和吸烟都会影响肺功能,但方式与既往认知不同。持续性哮喘患者会更早达到FEV1峰值且终生处于较低水平,而吸烟者从35岁开始出现更快的肺功能下降。

doi.org/10.1016/S2213-2600(25)00043-8
中国科学报:肺活量衰减始于20至25岁

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You can’t. What you can do, though, is use WhatsApp’s and Telegram’s web platforms to transfer stickers. It’s easy, but might take a while.Open WhatsApp in your browser, find a sticker you like in a chat, and right-click on it to save it as an image. The file won’t be a picture, though—it’s a webpage and will have a .webp extension. Don’t be scared, this is the way. Repeat this step to save as many stickers as you want.Then, open Telegram in your browser and go into your Saved messages chat. Just as you’d share a file with a friend, click the Share file button on the bottom left of the chat window (it looks like a dog-eared paper), and select the .webp files you downloaded. Click Open and you’ll see your stickers in your Saved messages chat. This is now your sticker depository. To use them, forward them as you would a message from one chat to the other: by clicking or long-pressing on the sticker, and then choosing Forward.

Should I buy bitcoin?

“To the extent it is used I fear it’s often for illicit finance. It’s an extremely inefficient way of conducting transactions, and the amount of energy that’s consumed in processing those transactions is staggering,” the former Fed chairwoman said. Yellen’s comments have been cited as a reason for bitcoin’s recent losses. However, Yellen’s assessment of bitcoin as a inefficient medium of exchange is an important point and one that has already been raised in the past by bitcoin bulls. Using a volatile asset in exchange for goods and services makes little sense if the asset can tumble 10% in a day, or surge 80% over the course of a two months as bitcoin has done in 2021, critics argue. To put a finer point on it, over the past 12 months bitcoin has registered 8 corrections, defined as a decline from a recent peak of at least 10% but not more than 20%, and two bear markets, which are defined as falls of 20% or more, according to Dow Jones Market Data.

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