Pratique du Shadowing: Shift Work, Sleep Deprivation, and Health - Apprendre l'anglais à l'oral avec la vidéo

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In the modern world, it is often seen as admirable to get as little sleep as possible in order to be the most productive.

As scientists look more closely at this issue, they are finding that sleep deprivation can contribute to a wide variety of health problems.

Some people's jobs require working outside the typical workday hours.

These include late night, overnight, and early morning shifts.

These workers are everywhere from

that cab you took at 3 a .m to the truck

driver bringing your overnight package to the paramedics on call ready for an emergency.

And as we move increasingly towards a 24 -hour society, there are more people working these atypical hours known as shift work

And chances are, they're sleep -deprived.

When social constraints are not an issue, sleep is biologically controlled by two major systems.

Process C, the circadian system, and Process S, the homeostatic sleep drive.

Process C is synchronized to the environment and provides wake -promoting signals at approximately the same time each day.

Process S increases your tendency to sleep the longer you've been awake.

They work together to make sure you're attentive or sleepy at the right time each day and night.

If you're new to the study of circadian rhythms in sleep, check out this video to learn more.

Shift workers often have trouble sleeping because their work schedule does not line up with their internal clock.

They have to work when cues from their body are telling them to sleep

and try to sleep when their body is expecting to be awake.

This difficulty in adjusting daily timing can be further compounded by rotating schedules or, for people on permanent night shift, flipping activity patterns on days off.

The difficulty of adapting to these complex schedules leads to shift workers not being able to sleep

when they have the opportunity and being sleepy when they need to work.

This maladjustment increases the possibility of accidents in the workplace, reinforces circadian misalignment and chronic sleep deprivation, and eventually leads to adverse health outcomes.

Sleep is essential to many processes in the body.

We spoke with Dr. Celine Vetter, an assistant professor from the University of Colorado Boulder, about the connection between shift work, circadian misalignment, sleep, and health.

Please forgive the audio quality.

Dr. Vetter generously met with us in the middle of the Center for Circadian Biology conference at UC San Diego,

and the recording conditions were not ideal.

So shift work does a lot of things to our bodies

and so if you want to think about how shift work disrupts physiology

and behavior and thereby can affect health you want to think about different axes

so you can think about on the one hand shift work disrupts your social life right

so there's a whole social component to how you have to plan

and anticipate and organize your life and it may be harder to follow some of those you know

extracurricular activities that are important to you so there's the social part

that I don't work on that much but

that is definitely a big part of it then there is the physiology part

and the behavioral part so we know

that shift work is associated with partial sleep deprivation

so shift workers on average sleep a little less usually

it's between 30 minutes to an hour on the average side

and it will depend on what shift you work and

when you work how little you will probably sleep it also induces a state of circadian misalignment so the

so the cycles of your behavior may be mismatched with environmental

cycles of the light dark cycle feeding fasting cycles what this means is

that if you do shift work

and especially night shift work

you're forced to be active at a time where your body is expecting to sleep

you're taking in food you're consuming food at a time where your body is usually expecting to digest

and pause you're also exposed to light

because we need a certain level of light to effectively

and safely do the work at a time where your body anticipates darkness right

and where we usually sleep and melatonin gets expressed and and

so due to that light exposure the secretion of melatonin gets suppressed

so there's a whole shift work is really not just one thing

Now let's talk about some of the basic health effects of shift work on the body that have been observed in studies.

Sleep deprivation has harmful effects on the endocrine system, which have been linked to health risks such as obesity and type 2 diabetes.

The endocrine system consists of glands that make chemical messengers known as hormones.

Hormones signal to target organs to help coordinate many processes, including metabolism.

Many of these hormones have a circadian rhythm peaking at different times of day.

Leptin and ghrelin are hormones that influence eating and wakefulness.

They work together to regulate appetite.

Ghrelin is secreted by cells in the stomach prior to habitual mealtimes, making you feel hungry.

Leptin is secreted from adipose tissue, commonly known as fat, and suppresses your appetite after you've eaten.

Leptin is also circadian -regulated, peaking at night, so that it suppresses your appetite when you're asleep.

Sleep deprivation is associated with higher levels of ghrelin, along with lower levels of leptin, meaning more of the signal telling you that you're hungry,

and less of the signal telling you that you're full.

Circadian misalignment and irregular mealtimes associated with shift work may cause irregular secretion of leptin and ghrelin, affecting food intake and energy expenditure.

Together with the practical complications of eating during shift work, such as limited access to healthy food at available mealtimes.

The imbalance of these hormones contributes to poor eating habits and poor health.

Laboratory data indeed show that circadian misalignment changes leptin and ghrelin levels, which may contribute to increased risk of obesity and type 2 diabetes.

The hormone insulin regulates glucose uptake by cells throughout the body.

Insulin resistance leading to type 2 diabetes is a serious risk among shift workers.

We spoke with Dr. Vetter about the interactions among shift work, appetite, and nutrition.

So I think for shift work and type 2 diabetes, we think that there are several things going on.

So one is that if you eat during your biological night, which is something that happens a lot,

the reaction that you get is that you get increased levels of insulin,

right? so your body is trying to deal with the blood sugar that's associated with

that food intake and needs to produce much more insulin to deal with elevated blood sugar

that we see so those are two different types of things

that we see happening so

and both of those types of reactions are considered risk factors for type 2 diabetes on the other hand

we've seen from some work from Andrew McHill for example

that energy expenditure is affected by working during the night

so you actually expend less energy for the same type of activity

which may contribute to increases in body weight and weight gain

and through that again will increase your risk to type 2 diabetes we've also seen

that circadian misalignment and sleep deprivation will influence food choices that you make.

So, you have a higher likelihood to pick more sugary foods,

fattier foods, and then if you combine this with the idea

that your body cannot deal that well anymore with

that blood sugar then then you know you're kind of accumulating the risk factors

and now chronically this will then lead to type 2 diabetes

so that's kind of part of the pathway

that you can think about you you your body cannot process the food as it can during the day

you you pick foods that are bad for you

but probably even worse than during the night as compared to during the day

and you're spending less energy while doing that and

so those those together will then lead to

that increased type 2 diabetes risk here's a short summary of what we talked about today

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which you can pause to take a look at prolonged shift work poses risks to many aspects of health especially

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when it involves sleep deprivation and circadian misalignment, and we have shown you only a few of them.

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There is still much to be learned about the health effects of shift work

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because this is a relatively new area of study.

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These problems sound serious, and they are, but there are ways to make healthy adjustments in our modern society.

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Workers can take action to help minimize their risk of chronic disease.

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Here's Dr. Vedder's advice for those who are shift workers.

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We know that lifestyle is one of the biggest factors, modifiable factors, in chronic disease prevention, right?

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So if we think about smoking, and a healthy diet, and exercise, and a body weight, and the normal range.

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those have a very big impact on your future chronic disease risk.

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Now, we know that those are not independent of circadian misalignment and sleep deprivation.

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I just said, you know, your food choices may be influenced by the levels of misalignment and sleep.

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So, I think what's important is to kind of educate the public about those links you know

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if you know your work shifts can you make an extra

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effort to prepare a healthy snack for you to take to work

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and really prioritize those healthy lifestyle choices now this is hard

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but those are very effective ways how to minimize your chronic disease risk

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and if you don't have the choice and

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and minimize the exposure to shift work

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then this is really your your best bet how to keep your chronic disease risk low.

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The other part is that oftentimes individuals have a hard time to prioritize sleep and really make sure that individuals know,

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employees know how important sleep is for all our physiology

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but also for social interactions and for safety at the workplace making sure

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that you prioritize sleep just as you would prioritize a healthy snack for work

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and make this equivalent and recognize the importance of this as a as a preventive factor

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that you can actively make an important priority in your life, I think is important.

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Not everyone is a shift worker, but everyone needs sleep, and sleep deprivation increases the risk for many health problems.

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The American Academy of Sleep recommends that adults get seven

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or more hours of sleep in order to minimize the risks of sleep deprivation.

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So ask yourself, did you get enough sleep last night?

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Vocabulaire et conseils d’expression pour cette leçon

Cette leçon d’expression orale s’appuie sur la vidéo « Shift Work, Sleep Deprivation, and Health ». Les mots qui reviennent le plus souvent : sleep, shift, risk, circadian, type. Cette vidéo contient 129 phrases et 1767 mots à répéter en shadowing. La partie parlée dure 12:10. Le locuteur parle à un rythme régulier d’environ 145 mots par minute, confortable pour le shadowing. 82 % des mots font partie des 3 000 mots les plus courants en anglais ; le reste mérite d’être vu avant de commencer.

Vocabulaire clé de cette vidéo

15 mots de la vidéo à retenir, avec leur prononciation et leur sens :

Mot	Prononciation	Sens
diabetes nom	/ˌdaɪəˈbiːtiːz/	diabète
chronic adjectif	/ˈkɹɑ.nɪk/	chronique
hormone nom	/ˈhoɹmoʊn/	hormone
contribute verbe	/kənˈtɹɪb.jut/	contribuer
appetite nom	/ˈæp.əˌtaɪt/	appétit
insulin nom	/ˈɪnsəlɪn/	insuline
minimize verbe	/ˈmɪn.ɪˌmaɪz/	minimiser
regulate verbe	/ˈɹɛɡ.jə.leɪt/	régler
physiology nom	/ˌfɪziˈɑ.lə.d͡ʒi/	physiologie
hungry adjectif	/ˈhʌŋ.ɡɹi/	affamé, avoir faim
exposure nom	/ɪkˈspəʊ.ʒə(ɹ)/	exposition
difficulty nom	/ˈdɪfɪkəlti/	difficulté
interaction nom	/ˌɪn.təˈɹæk.ʃən/	interaction
lifestyle nom	/ˈlaɪfˌstaɪl/	mode de vie, hygiène de vie
overnight adverbe	/əʊvə(ɹ)ˈnaɪt/	du jour au lendemain

Les verbes à particule que vous entendrez

Mot	Sens
check out verbe	mater, regarder

La grammaire de cette vidéo

Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :

Structure	Dans la vidéo
Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait	is often seen · is synchronized · is associated
Present perfect have/has + participe passé — une action passée qui compte encore maintenant	you've been · have been observed · have been linked
Propositions relatives who / which + proposition — une précision sur une personne ou une chose	system, which have · night, which is · those who are

Prononciation à surveiller

Le locuteur utilise 18 contractions et formes réduites, comme you're, don't, we've. Prononcez-les sous leur forme courte, telles que vous les entendez.

Les sons « th »: rhythm /ˈɹɪð.əm/, thereby /ðɛɹˈbaɪ/, pathway /ˈpæθˌweɪ/
Les sons « sh » et « zh »: exposure /ɪkˈspəʊ.ʒə(ɹ)/, interaction /ˌɪn.təˈɹæk.ʃən/, tissue /ˈtɪʃ.(j)u/, prevention /pɹɪˈvɛnʃən/, partial /ˈpɑɹʃəl/
Mots longs — placez bien l’accent: physiology /ˌfɪziˈɑ.lə.d͡ʒi/, difficulty /ˈdɪfɪkəlti/, interaction /ˌɪn.təˈɹæk.ʃən/, obesity /ə(ʊ)ˈbiːsɪti/, expenditure /ɛkˈspɛndɪt͡ʃə/

Les sons difficiles pour les francophones :

/h/ — il se souffle, il n’est pas muet: hormone /ˈhoɹmoʊn/, hungry /ˈhʌŋ.ɡɹi/, habit /ˈhæb.ɪt/, harmful /ˈhɑɹmfl̩/, likelihood /ˈlaɪklihʊd/
/tʃ/ et /dʒ/ — à ne pas adoucir en « ch » et « j »: physiology /ˌfɪziˈɑ.lə.d͡ʒi/, expenditure /ɛkˈspɛndɪt͡ʃə/, package /ˈpæk.ɪd͡ʒ/, biological /ˌbaɪ.əˈlɑ.d͡ʒɪ.kəl/, adjust /əˈd͡ʒʌst/
/r/ anglais — langue recourbée, sans frotter la gorge: chronic /ˈkɹɑ.nɪk/, hormone /ˈhoɹmoʊn/, contribute /kənˈtɹɪb.jut/, regulate /ˈɹɛɡ.jə.leɪt/, suppress /səˈpɹɛs/

Comment s’entraîner avec cette vidéo

Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme diabetes, chronic, hormone.

Qu'est-ce que la technique du Shadowing ?

Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.

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Pratique du Shadowing: Shift Work, Sleep Deprivation, and Health - Apprendre l'anglais à l'oral avec la vidéo

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