Navigation Links
Sleep mode: The energy cost of sleep deprivation
Date:1/12/2011

The findings show that missing a night of sleep burns roughly 135 calories, the equivalent of two slices of bread or a 225 ml glass of semi-skimmed milk. In terms of physical exertion, this amounts to walking just under two miles. On the flip side, eight hours of sleep saved the same approximate amount of energy.

'While the amount of energy saved during sleep may seem small, it was actually more than we expected,' says Professor Kenneth Wright, lead author of the study and Director of Colorado University's Sleep and Chronobiology Laboratory. 'If one considers the amount of positive energy storage needed to explain the obesity epidemic is 50 calories a day (Hill et al., 2003), the energy savings represented by sleep is physiologically meaningful.'

The tightly controlled study included seven carefully vetted young adult subjects, with the participants required to stay in bed and follow a weight maintenance diet for the entire three-day duration. The first day established baseline data and consisted of a typical 16 hours of wakefulness followed by eight hours of sleep. Days two and three included 40 hours of total sleep deprivation followed by eight hours of recovery sleep.

The findings showed that compared to a typical night of sleep, the amount of energy expended by the subjects during 24 hours of sleep deprivation increased about seven per cent. In contrast, energy expenditure decreased to five per cent during the recovery episode, which included 16 hours of wakefulness (following the sleep deprivation night), then eight hours of recovery sleep.

The study proves there is a direct correlation between the sleepwake cycle and how the body uses energy. It also demonstrates that sleep deprivation is metabolically costly. 'The function of sleep, especially in humans, is considered one of the most important scientific enigmas,' commented Wright, who hopes the new data will help researchers better understand one piece of the sleep puzzle.

One question arising from the study concerns why humans don't conserve more energy during sleep. 'There are other functions of sleep that are important and cost energy,' explains Wright. 'Some conserved energy may be re-distributed to support vital physiological processes like learning and memory consolidation, immune function, and hormone synthesis and release.'

Wright is also quick to caution that energy expenditure during sleep deprivation is neither a safe nor effective strategy for weight loss as other studies have shown that chronic sleep deprivation is associated with impaired cognition and weight gain. He hopes recently initiated research in his lab will shed further light on this relationship and generate useful findings for 'at risk' members of the public.


'/>"/>

Contact: Mary Arbuthnot
marbuthnot@physoc.org
44-020-726-95721
Wiley-Blackwell
Source:Eurekalert

Related biology news :

1. Metabolic cost of human sleep deprivation quantified by University of Colorado team
2. The high price of sleep disorders
3. Lets not sleep on it
4. New sleep cycle discovery explains why fatty diets during pregnancy make kids obese
5. Analyzed relation between sleep disorders and risk perception by drivers with disorder
6. Researchers study sleep apnea and lack of oxygen
7. WSU researchers discover key mechanism behind sleep
8. New link between pollution, temperature and sleep-disordered breathing
9. Biologists identify genes regulating sleeping and feeding
10. HJF research psychologist receives Sleep Research Societys Young Investigator Award
11. Extremes of sleep related to increased fat around organs
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/15/2016)... ALBANY, New York , June 15, 2016 ... published a new market report titled "Gesture Recognition Market ... Trends and Forecast, 2016 - 2024". According to the ... at USD 11.60 billion in 2015 and is ... and reach USD 48.56 billion by 2024.  ...
(Date:6/9/2016)... Finland , June 9, 2016 ... National Police deploy Teleste,s video security solution to ensure the ... France during the major tournament ... data communications systems and services, announced today that its video ... Prefecture to back up public safety across the ...
(Date:6/3/2016)... , June 3, 2016 ... von Nepal hat ... Lieferung hochsicherer geprägter Kennzeichen, einschließlich Personalisierung, Registrierung ... in der Produktion und Implementierung von Identitätsmanagementlösungen. ... Ausschreibung im Januar teilgenommen, aber Decatur wurde ...
Breaking Biology News(10 mins):
(Date:12/2/2016)... Raleigh, NC (PRWEB) , ... December 01, 2016 ... ... the US Computational Science Symposium (CSS) and the popularity of US Single Day ... will take place in early Summer 2018, in Raleigh, NC. Topics of the ...
(Date:12/2/2016)... ... December 01, 2016 , ... Orthogonal, a ... their recent FDA Class II 510(k) clearance for their flagship medical device, SimplECG. ... remote cardiac monitoring devices that rely on cloth-based nanosensors. While other companies have ...
(Date:12/2/2016)... NEW YORK , Dec. 1, 2016   ... liquid photopurification, announced today that the Company has concluded ... has the right for a 90-day period to acquire ... invoice value of approximately USD 3.7 million.  ... an agreement with Tamarack under which Tamarack will seek ...
(Date:11/30/2016)... CA (PRWEB) , ... November 30, 2016 , ... ... a new moving magnet Voice Coil Actuator with a flexure design that ensures ... long life with cost-effective pricing and is ideally suited where extreme precision is ...
Breaking Biology Technology: