シャドーイング練習: How long can hair grow? - Maksim Plikus - YouTubeで英語スピーキングを学ぶ
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At age 44, Xie Qiuping cut her hair for the first time in over three decades.
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At age 44, Xie Qiuping cut her hair for the first time in over three decades.
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At the time, her impressive locks extended over five meters— earning the Guinness World Record for the world's longest hair.
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But even with this record-setting feat, her hair might not have reached its maximum possible length.
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So just how long can human hair actually grow?
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To get to the bottom of this question, let's start at the bottom of a hair follicle.
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Follicles are tube-shaped structures nestled roughly half a centimeter below the skin's surface.
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At their base is what's called the hair bulb, and it contains rapidly dividing matrix cells.
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As they divide, these develop into specialized hair cells called trichocytes, which harden as they fill themselves with cable-like keratin proteins.
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As more and more trichocytes are produced, they form a strand of hair that emerges from the follicle and grows upwards.
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All the hair on your body grows this way, but not all hair will grow to the same length, shape, or color.
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Those properties are determined by yet another type of cell within the hair bulb: the fibroblast.
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Fibroblasts instruct the matrix cells to grow specific kinds of hair for each part of the body.
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This is why doctors doing hair implants usually use follicles from the same body part, though they'll sometimes change things up.
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For example, eyelashes are some of the shortest hairs on your body at an average length of one centimeter.
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So to give people longer eyelashes, doctors might implant scalp follicles, which grow at a rate of about 15 centimeters per year.
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So these patients will have to trim their new lashes regularly to avoid a blinding curtain of hair.
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In general, our follicles are very resilient.
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Even if you pluck hair out with your fingers or some wax, you’ll likely only damage matrix cells, not fibroblasts.
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So given time, those hair bulbs will repair themselves and begin producing new hair.
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However, each strand of hair will only grow for so long.
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We don't fully understand how follicles measure time, but in most cases they'll stop growing a strand after 5 to 7 years.
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This means that at the rate of 15 centimeters a year, the average person’s scalp hair could reach a maximum length of around one meter.
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The precise duration and speed of hair growth varies from person to person depending on genetics, hormones, and various health conditions, and it’s difficult to know exactly what combination of these factors let Xie Quiping reach her record.
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But however long your locks may be, when a follicle stops growing, the hair falls out— shedding from our heads slowly, or in clumps during showers and hair brushing.
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After a hair is lost, fibroblasts will trigger the growth of a new strand to fill out your scalp— usually.
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As we age, follicles run out of certain cell types, which can lead to changes in hair growth.
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For example, when they run out of pigment-producing melanocyte stem cells, follicles begin producing gray hairs.
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And since there are only a handful of melanocyte stem cells per follicle to begin with, they tend to run out relatively early in a person’s life.
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Similarly, when follicles run out of epithelial stem cells, they begin to shrink and grow shorter, thinner strands before eventually shutting down production altogether.
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This is what leads to baldness, though the condition can also be accelerated by testosterone, which can prevent fibroblasts’ instructions from reaching a follicle’s cells.
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While it’s completely natural for hair growth to change over the course of our lives, there are ways to take more control of our scalps.
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Some baldness remedies remove excess testosterone, and special shampoos can address the coarse, brittle strands reported by many people with gray hair.
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Since our bodies already produce hair at the fastest possible biological speed, there's currently no way to grow hair faster.
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But even if you’re unlikely to beat Xie Qiuping’s record, with time, the right treatments, and some genetic luck, you should be able to grow some luscious locks of your own.
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このレッスンについて
このレッスンでは、人間の髪の成長に関する興味深い事実を学びます。特に、髪の成長速度、髪がどのように生成されるか、そして髪の色や形に影響を与える要因について焦点を当てます。このトピックを通じて、英語のスピーキング練習を行い、英語の発音を良くするためのスキルを強化します。また、話し言葉に対する理解を深め、実際の会話で役立つ表現を学ぶことも目的としています。
重要な語彙とフレーズ
- 髪の毛 (hair)
- 毛包 (follicle)
- 髪の球 (hair bulb)
- 細胞 (cells)
- ケラチン (keratin)
- 毛髪成長 (hair growth)
- 白髪 (gray hair)
- 抜け毛 (baldness)
練習のヒント
このビデオのスピードとトーンに合わせて、英語シャドーイングを活用することをお勧めします。ビデオの内容を繰り返し聞きながら、文を声に出すことで、発音や抑揚を自然に身につけることができます。特に、登場人物の話し方や言葉のリズムに注目し、英語スピーキング練習を通じてそのスタイルを模倣してみてください。
速度が速い部分では、一旦ストップして、その部分を繰り返すことも効果的です。これにより、難しい言い回しや発音が定着し、YouTubeで英語学習の際にも自信を持てるようになります。また、学習が進むにつれて、特定の表現や語彙を使って自分自身の意見を書いたり話したりする練習をすることで、さらに理解を深めていくことができます。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。