Featured Research

from universities, journals, and other organizations

Lung Function Regulated By Circadian Rhythms; Exercise And Respiratory Treatments May Be Best In Afternoon

Date:
October 29, 2004
Source:
American College Of Chest Physicians
Summary:
Circadian rhythms, the body's biological processes that repeat in 24-hour cycles, may have a significant effect on a person's lung function and, ultimately, help determine the best time of day for exercise and the administration of medications and medical procedures.

Circadian rhythms, the body's biological processes that repeat in 24-hour cycles, may have a significant effect on a person's lung function and, ultimately, help determine the best time of day for exercise and the administration of medications and medical procedures. In a new study presented at CHEST 2004, the 70th annual international scientific assembly of the American College of Chest Physicians (ACCP), lung function was found to have a natural circadian rhythm, where it is at its peak during the late afternoon hours and at its lowest around midday.

"Circadian rhythms regulate our biological cycles for sleep, activity level, metabolism, and many other processes through our body's exposure to sunlight and darkness," said Boris I. Medarov, MD, FCCP, Long Island Jewish Medical Center, New Hyde Park, NY. "Our study finds that lung function has its own rhythm that may govern how much energy we exert throughout the day and the best times to engage in certain activities."

The study investigated how lung function fluctuated throughout the working hours of 8:00 am and 5:00 pm. In a 5-year period, 4,835 patients underwent several breathing tests and were subdivided into nine groups based on the time of day the test was performed. Results of FEV1/FVC and total lung capacity testing were compared within nine time intervals. Results showed that patients' overall airway resistance was at its most prominent around 12:00 pm but reached its minimum between 4:00 to 5:00 pm, showing that lung function was at its best in the late afternoon.

"We often associate the end of the work day with being tired and less motivated for physical exertion; however, lung function seems to be at its best during this time. As a result, exercising or engaging in other physical activities in the late afternoon may help us to achieve optimal performance," said Dr. Medarov. Circadian rhythms of lung function may also have implications for the administration of asthma medications and the timing of medical procedures.

"Many patients with asthma and chronic obstructive pulmonary disease administer bronchodilators around the clock, when they actually may need less treatments and a different regimen that includes administering the medication at midday when their lung function is at its lowest," said Dr. Medarov. "It also may be better to extubate patients in the late afternoon when their lung function is at its best and breathing on their own is easier." Relaxation techniques or biofeedback may modify lung function circadian rhythms, helping to manage a person's low and high lung function throughout the day, added Dr. Medarov, but more studies need to be completed in this area.

"Circadian rhythms can greatly influence how patients with respiratory conditions respond to certain therapies," said Paul Kvale, MD, FCCP, President of the American College of Chest Physicians. "By knowing how the respiratory system naturally responds at different times during the day, health-care providers can adapt treatments and procedures to better fit patients' individual needs."

###

CHEST 2004 is the 70th annual international scientific assembly of the American College of Chest Physicians, held October 23-28 in Seattle, WA. ACCP represents 16,000 members who provide clinical respiratory, critical care, sleep, and cardiothoracic patient care in the United States and throughout the world. The ACCP's mission is to promote the prevention and treatment of diseases of the chest through leadership, education, research, and communication. For more information about the ACCP, please visit the ACCP Web site at http://www.chestnet.org.


Story Source:

The above story is based on materials provided by American College Of Chest Physicians. Note: Materials may be edited for content and length.


Cite This Page:

American College Of Chest Physicians. "Lung Function Regulated By Circadian Rhythms; Exercise And Respiratory Treatments May Be Best In Afternoon." ScienceDaily. ScienceDaily, 29 October 2004. <www.sciencedaily.com/releases/2004/10/041027143621.htm>.
American College Of Chest Physicians. (2004, October 29). Lung Function Regulated By Circadian Rhythms; Exercise And Respiratory Treatments May Be Best In Afternoon. ScienceDaily. Retrieved August 1, 2014 from www.sciencedaily.com/releases/2004/10/041027143621.htm
American College Of Chest Physicians. "Lung Function Regulated By Circadian Rhythms; Exercise And Respiratory Treatments May Be Best In Afternoon." ScienceDaily. www.sciencedaily.com/releases/2004/10/041027143621.htm (accessed August 1, 2014).

Share This




More Health & Medicine News

Friday, August 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Ebola Vaccine Might Be Coming, But Where's It Been?

Ebola Vaccine Might Be Coming, But Where's It Been?

Newsy (Aug. 1, 2014) — Health officials are working to fast-track a vaccine — the West-African Ebola outbreak has killed more than 700. But why didn't we already have one? Video provided by Newsy
Powered by NewsLook.com
Study Links Certain Birth Control Pills To Breast Cancer

Study Links Certain Birth Control Pills To Breast Cancer

Newsy (Aug. 1, 2014) — Previous studies have made the link between birth control and breast cancer, but the latest makes the link to high-estrogen oral contraceptives. Video provided by Newsy
Powered by NewsLook.com
House Republicans Vote to Sue Obama Over Healthcare Law

House Republicans Vote to Sue Obama Over Healthcare Law

Reuters - US Online Video (July 31, 2014) — The Republican-led House of Representatives votes to sue President Obama, accusing him of overstepping his executive authority in making changes to the Affordable Care Act. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Uganda on Alert for Ebola but No Confirmed Cases

Uganda on Alert for Ebola but No Confirmed Cases

AFP (July 31, 2014) — Uganda's health minister said on Thursday that there are no confirmed cases of Ebola in the country, but that it remained on alert for cases of the deadly virus. Uganda has suffered Ebola outbreaks in the past, most recently in 2012. Duration: 00:59 Video provided by AFP
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