Featured Research

from universities, journals, and other organizations

Regular Daily Exercise Does Not Increase Total Sleep Time

Date:
June 8, 2009
Source:
American Academy of Sleep Medicine
Summary:
New research shows that days with increased activity were followed by nights with lower total sleep time, while nights with lower total sleep time were followed by increased activities during the next day.

According to a research abstract that will be presented on June 8 at Sleep 2009, the 23rd Annual Meeting of the Associated Professional Sleep Societies, days with increased activity were followed by nights with lower total sleep time (TST), while nights with lower TST were followed by increased activities during the next day.

Results indicated that total sleep time increased by an average of 42 minutes a night only after days with low activity. In related findings, increased activity was seen in participants with higher body mass index (BMI).

According to lead author Arn Eliasson, MD, at the Integrative Cardiac Health Project at Walter Reed Army Medical Center in Washington DC, results of the study were the opposite of expectations. Quality of sleep (measured by sleep efficiency or sleep time divided by time in bed) did not improve after days of increased exertion and sleep efficiency did not vary according to the amount of exertion during the day.

"It has long been recommended, even championed, that getting exercise is part of the recipe for improved sleep. Our data do not support that notion," said Eliasson. "The longest sleep and best sleep efficiency occurred after days with low non-exercise exertion. Similarly, we expected that better-rested subjects would be more inclined to get exercise or have busier days; however, bett er rested subjects got less exercise and had less calorie expenditure. After relatively more sleep (more than six hours), all measures of exertion decreased."

The study included 14 subjects who wore actigraphy armbands that measure body temperature, ambient temperature, position sense, and accelerometry for approximately 23 days. Data regarding total sleep time, sleep efficiency, total energy expenditure, exercise energy expenditure, non-exercise activity steps and BMI were collected. When sorted by BMI, seven subjects had a normal BMI (under 25 kg/m2) and seven were overweight (over 25 kg/m2). Paradoxically, the group with higher BMI had a higher total energy expenditure, and took more steps per day.

Dr. Eliasson speculates that these findings may be explained by personality types: Individuals who are Type A (ambitious, active people during the day), may also be more hyper-vigilant at night and therefore sleep less; whereas people who are Type B (lower-key people who are less active) may have no difficulties falling or staying asleep. Another explanation may be that job and life stresses lead to busier days, more exertion and more calories burned but may interfere with sleep.

Abstract Title: Correlations between Activity and Sleep


Story Source:

The above story is based on materials provided by American Academy of Sleep Medicine. Note: Materials may be edited for content and length.


Cite This Page:

American Academy of Sleep Medicine. "Regular Daily Exercise Does Not Increase Total Sleep Time." ScienceDaily. ScienceDaily, 8 June 2009. <www.sciencedaily.com/releases/2009/06/090608071937.htm>.
American Academy of Sleep Medicine. (2009, June 8). Regular Daily Exercise Does Not Increase Total Sleep Time. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2009/06/090608071937.htm
American Academy of Sleep Medicine. "Regular Daily Exercise Does Not Increase Total Sleep Time." ScienceDaily. www.sciencedaily.com/releases/2009/06/090608071937.htm (accessed July 30, 2014).

Share This




More Health & Medicine News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Health Insurers' Profits Slide

Health Insurers' Profits Slide

Reuters - Business Video Online (July 30, 2014) Obamacare-related costs were said to be behind the profit plunge at Wellpoint and Humana, but Wellpoint sees the new exchanges boosting its earnings for the full year. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Concern Grows Over Worsening Ebola Crisis

Concern Grows Over Worsening Ebola Crisis

AFP (July 30, 2014) Pan-African airline ASKY has suspended all flights to and from the capitals of Liberia and Sierra Leone amid the worsening Ebola health crisis, which has so far caused 672 deaths in Guinea, Liberia and Sierra Leone. Duration: 00:43 Video provided by AFP
Powered by NewsLook.com
At Least 20 Chikungunya Cases in New Jersey

At Least 20 Chikungunya Cases in New Jersey

AP (July 30, 2014) At least 20 New Jersey residents have tested positive for chikungunya, a mosquito-borne virus that has spread through the Caribbean. (July 30) Video provided by AP
Powered by NewsLook.com
Generics Eat Into Pfizer's Sales

Generics Eat Into Pfizer's Sales

Reuters - Business Video Online (July 29, 2014) Pfizer, the world's largest drug maker, cut full-year revenue forecasts because generics could cut into sales of its anti-arthritis drug, Celebrex. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



      Save/Print:
      Share:

      Free Subscriptions


      Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

      Get Social & Mobile


      Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

      Have Feedback?


      Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
      Mobile: iPhone Android Web
      Follow: Facebook Twitter Google+
      Subscribe: RSS Feeds Email Newsletters
      Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins