The Effects Of Sleep Deprivation And Circadian Phase On Energy Expenditure.

Overview

From an evolutionary perspective, energy conservation/homeostasis theories propose that sleep and circadian physiology serve to conserve energy (i.e., energy expenditure decreases during the habitual night and sleep), so that 24h energy needs are reduced. However, little research has been performed to support this proposed function in humans, and therefore, it remains to be a scientific enigma. The aims of this dissertation were to: (1) quantify the metabolic costs of one night of sleep deprivation and of ...
See more details below
Other sellers (Paperback)
  • All (3) from $71.99   
  • New (2) from $71.99   
  • Used (1) from $81.27   
Sending request ...

More About This Book

Overview

From an evolutionary perspective, energy conservation/homeostasis theories propose that sleep and circadian physiology serve to conserve energy (i.e., energy expenditure decreases during the habitual night and sleep), so that 24h energy needs are reduced. However, little research has been performed to support this proposed function in humans, and therefore, it remains to be a scientific enigma. The aims of this dissertation were to: (1) quantify the metabolic costs of one night of sleep deprivation and of recovery sleep; (2) determine effects of sleep architecture and the transition from wakefulness to sleep on energy expenditure; (3) determine effects of circadian phase on energy expenditure and the relation to thermophysiological variables in humans. Indirect calorimetry (either a metabolic cart or whole room calorimeter) was used to quantify energy expenditure. Sleep deprivation increased energy expenditure during the night and recovery sleep reduced energy expenditure compared to baseline. Lower energy expenditure during recovery sleep episodes appears to be related to a reduction in the number of arousals rather than differences in sleep stage, since energy expenditure was similar between sleep stages, but higher during wakefulness prior to and following sleep onset. During the transition from wakefulness to sleep, there was a greater rate of decline in energy expenditure on the recovery night when compared to baseline. All energy expenditure metrics (except respiratory quotient) and temperature variables showed variation with internal circadian phase. Energy expenditure was lowest prior to habitual bedtime whereas core body temperature was lowest ~2h prior to habitual waketime. These findings indicate that sleep and circadian processes influence energy expenditure in humans to promote lower energy use at night; although the effects of sleep on reducing energy expenditure appear to be greater than the effects of internal circadian phase. The energy conserved during sleep at night was ~562 kjoules/24h, a small, but physiologically meaningful influence on total daily energy expenditure. These findings suggest that sleep does conserve energy in humans; however, sleep is still a metabolically active state, perhaps due to energetic costs of other proposed sleep functions (e.g. brain plasticity, protein synthesis).
Read More Show Less

Product Details

  • ISBN-13: 9781244040885
  • Publisher: BiblioLabsII
  • Publication date: 9/11/2011
  • Pages: 184
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.39 (d)

Customer Reviews

Be the first to write a review
( 0 )
Rating Distribution

5 Star

(0)

4 Star

(0)

3 Star

(0)

2 Star

(0)

1 Star

(0)

Your Rating:

Your Name: Create a Pen Name or

Barnes & Noble.com Review Rules

Our reader reviews allow you to share your comments on titles you liked, or didn't, with others. By submitting an online review, you are representing to Barnes & Noble.com that all information contained in your review is original and accurate in all respects, and that the submission of such content by you and the posting of such content by Barnes & Noble.com does not and will not violate the rights of any third party. Please follow the rules below to help ensure that your review can be posted.

Reviews by Our Customers Under the Age of 13

We highly value and respect everyone's opinion concerning the titles we offer. However, we cannot allow persons under the age of 13 to have accounts at BN.com or to post customer reviews. Please see our Terms of Use for more details.

What to exclude from your review:

Please do not write about reviews, commentary, or information posted on the product page. If you see any errors in the information on the product page, please send us an email.

Reviews should not contain any of the following:

  • - HTML tags, profanity, obscenities, vulgarities, or comments that defame anyone
  • - Time-sensitive information such as tour dates, signings, lectures, etc.
  • - Single-word reviews. Other people will read your review to discover why you liked or didn't like the title. Be descriptive.
  • - Comments focusing on the author or that may ruin the ending for others
  • - Phone numbers, addresses, URLs
  • - Pricing and availability information or alternative ordering information
  • - Advertisements or commercial solicitation

Reminder:

  • - By submitting a review, you grant to Barnes & Noble.com and its sublicensees the royalty-free, perpetual, irrevocable right and license to use the review in accordance with the Barnes & Noble.com Terms of Use.
  • - Barnes & Noble.com reserves the right not to post any review -- particularly those that do not follow the terms and conditions of these Rules. Barnes & Noble.com also reserves the right to remove any review at any time without notice.
  • - See Terms of Use for other conditions and disclaimers.
Search for Products You'd Like to Recommend

Recommend other products that relate to your review. Just search for them below and share!

Create a Pen Name

Your Pen Name is your unique identity on BN.com. It will appear on the reviews you write and other website activities. Your Pen Name cannot be edited, changed or deleted once submitted.

 
Your Pen Name can be any combination of alphanumeric characters (plus - and _), and must be at least two characters long.

Continue Anonymously

    If you find inappropriate content, please report it to Barnes & Noble
    Why is this product inappropriate?
    Comments (optional)