C1 上級 49 タグ追加 保存
動画の字幕をクリックしてすぐ単語の意味を調べられます!
単語帳読み込み中…
字幕の修正報告
[ INTRO ]
It’s advice as old as time: if you get a sunburn, start lathering on the Aloe Vera.
And when we say ‘old as time’, we mean it.
Humans have been using aloe vera medicinally for thousands of years.
But does the slimy gel actually have skin-healing properties?
Well, the research is surprisingly scarce, but it seems like it may help boost your skin’s
natural healing process.
Sunburns themselves really aren’t all that different than burns from a campfire, a curling
iron, or stepping on a George Foreman grill.
So studies looking at burn healing tend to lump them together.
And there is some evidence that applying the mucus innards from Aloe plants helps you heal
faster after a burn.
A review from 2007 in the journal Burns found that in 127 burn victims, those who used aloe
healed almost 9 days faster on average than those in control groups.
But what aloe actually does is a little less clear.
In general, there are three main concerns when treating burns: reducing pain, actually
healing the wound, and preventing infection.
Aloe’s antibacterial and antifungal activities are well documented, so it might simply help
because it keeps pesky microbes at bay.
But ask just about anyone who slathers on the aloe after a sunburn, and they’ll swear
it’s an analgesic, meaning that it reduces pain.
And that might be because it reduces inflammation—your body’s immune response that makes things
like sunburns all red and painful.
For example, an experiment in 1993 was able to isolate an enzyme in aloe that breaks down
bradykinin, an inflammatory substance linked with pain.
But there’s not all that much clinical research on aloe pain-killing effects, so the jury
is still out on whether they’re real, or it’s just acting as a placebo.
There’s a bit more evidence that it boosts skin healing.
Studies in rats have shown that aloe extract helps new skin cells move into burned areas,
so they can rebuild the damaged tissue.
And the gooey gel in aloe vera contains a large amount of glucomannan, a fiber comprised
mostly of the sugar mannose, which stimulates the production of fibroblastic growth factor.
It helps stimulate the formation of collagen and new blood vessels, which speed up how
quickly the skin heals.
That said, human studies to date are kind of flimsy.
A 2012 Cochrane review noted that the few trials that have been conducted aren’t high
quality—they’re all small, and their results are potentially biased by things the patients
or caregivers knowing aloe was being used.
So, it might work, or it might just be that people think it’ll work.
And when it comes to your over the counter sunburn gel, it might not even be the aloe
itself.
Researchers have found that it can speed up that absorption of vitamins and drugs through
the skin.
So if your aloe gel also has things like Vitamin E, or some other anti-inflammatory drug, that
substance gets into your skin faster.
But whether aloe works or not, I think we can all agree it’s just better to avoid
needing it.
So if you’re going to spend some time in the sun this summer, maybe take steps to avoid
overexposure instead of relying on aloe to soothe your beet-red skin afterwards.
Thanks to Joelle and Brianna Beecher for asking, and to all our patrons who voted for this
question in our poll.
If you want to ask us questions like this and help decide which of them we answer, or
just get a bunch of awesome rewards you can’t get anywhere else, you can head on over to
Patreon.com/SciShow.
[ OUTRO ]
コツ:単語をクリックしてすぐ意味を調べられます!

読み込み中…

日焼けにアロエって本当に効くの?

49 タグ追加 保存
Mahiro Kitauchi 2020 年 6 月 30 日 に公開
お勧め動画
  1. 1. クリック一つで単語を検索

    右側のスプリクトの単語をクリックするだけで即座に意味が検索できます。

  2. 2. リピート機能

    クリックするだけで同じフレーズを何回もリピート可能!

  3. 3. ショートカット

    キーボードショートカットを使うことによって勉強の効率を上げることが出来ます。

  4. 4. 字幕の表示/非表示

    日・英のボタンをクリックすることで自由に字幕のオンオフを切り替えられます。

  5. 5. 動画をブログ等でシェア

    コードを貼り付けてVoiceTubeの動画再生プレーヤーをブログ等でシェアすることが出来ます!

  6. 6. 全画面再生

    左側の矢印をクリックすることで全画面で再生できるようになります。

  1. クイズ付き動画

    リスニングクイズに挑戦!

  1. クリックしてメモを表示

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔