Featured Research

from universities, journals, and other organizations

Exercise For Cardiovascular Health Keeps Knee Cartilage Healthy Too, Study Suggests

Date:
October 3, 2007
Source:
John Wiley & Sons, Inc.
Summary:
Exercise for cardiovascular health keeps knee cartilage healthy, too, suggests a long-term, community-based study. The world's most common joint disease, osteoarthritis is a major cause of disability among adults over the age of 50. Whether physical activity is beneficial or detrimental to weight-bearing joints, knees in particular, has been open to debate. Some studies implicate physical activity in provoking knee OA, while others suggest that physical activity may actually protect the knee joint from the disease.

The world's most common joint disease, osteoarthritis (OA) is a major cause of disability among adults over the age of 50. Whether physical activity is beneficial or detrimental to weight-bearing joints, knees in particular, has been open to debate. Some studies implicate physical activity in provoking knee OA, while others suggest that physical activity may actually protect the knee joint from the disease.

Related Articles


Confounding the matter is the fact that knee injury is a known risk factor for knee OA. Then, there's the unclear role of osteophytes in knee OA progression, compounded by the limitations of radiographs for monitoring small yet significant changes in joint structure.

For a clearer picture of the impact of physical activity on the knee joint, a team of researchers in Australia turned to magnetic resonance imaging (MRI). This highly accurate high-tech tool makes it possible to directly visualize joint structures, detect early and pre-disease states of OA, and assess the influence of potential risk factors. Taking advantage of this novel methodology, the researchers studied the effect of physical activity, in various degrees of intensity, frequency, and duration, on knee structures in a total of 257 healthy adults between the ages of 50 and 79, with no history of knee injury or OA. Their findings, presented in Arthritis Care & Research suggest that exercise that is good for the heart is also good for the knee.

Recruited from an established community-based research population, the Melbourne Collaborative Cohort Study, subjects all underwent MRI exams on the tibia bone and tibiofemoral joint of their dominant knee--the one on the leg they first step forward when walking. MRI was used to assess cartilage defects and bone marrow lesions, as well as measure cartilage volume, an indicator of cartilage health and strength.

Loss of knee cartilage is linked to worsening knee symptoms in OA sufferers. Subjects also answered specific questions regarding their exercise and walking habits, as well as routine activity at home and at work, to determine their level of physical activity in both the 6 months and 7 days prior to the study. To create a baseline for each subject, past information on weight, height, body mass index, and physical activity, from questionnaires completed between 1990 and 1994, was obtained. Then, the team performed a series of analyses and comparisons.

Among the notable findings, both baseline and current vigorous physical activity-- exercise that gets the heart pumping and the body sweating--were associated with an increase in tibial cartilage volume, free from cartilage defects. What's more, tibial cartilage volume increased with frequency and duration of vigorous activity. Recent weight-bearing exercise was also linked to increased tibial cartilage volume and reduced cartilage defects. Finally, moderate physical activity, including regular walking, was associated with a lower incidence of bone marrow lesions.

"This is the first study to demonstrate a potentially beneficial effect of walking on the reduction in the risk of bone marrow lesions in the knee," notes the study's leading author, Dr. Flavia M. Cicuttini. "Bone marrow lesions have been associated with pain and radiograph-defined progression of osteoarthritis, type II collagen degradation, and loss of cartilage volume."

Demonstrating a protective effect of past and current vigorous physical activity on knee cartilage in healthy adults, this study strongly supports the benefits of exercise for older individuals at risk for OA. Though both the intensity and duration of physical activity had a significant positive impact on cartilage, the ideal amount of physical activity for joint health remains unclear. "Our data suggest that at least 20 minutes once per week of activity sufficient to result in sweating or some shortness of breath might be adequate. This is similar to, if not somewhat less than, the recommendations for cardiovascular health," Dr. Cicuttini observes.

Article: "Effect of Physical Activity on Articular Knee Joint Structures in Community-Based Adults," Tina L. Racunica, Andrew J. Teichtahl, Yuanyuan Wang, Anita E. Wluka, Dallas R. English, Graham G. Giles, Richard O'Sullivan, and Flavia M. Cicuttini, Arthritis Care & Research, October 2007; (DOI: 10.1002/art.22990).


Story Source:

The above story is based on materials provided by John Wiley & Sons, Inc.. Note: Materials may be edited for content and length.


Cite This Page:

John Wiley & Sons, Inc.. "Exercise For Cardiovascular Health Keeps Knee Cartilage Healthy Too, Study Suggests." ScienceDaily. ScienceDaily, 3 October 2007. <www.sciencedaily.com/releases/2007/09/070928092134.htm>.
John Wiley & Sons, Inc.. (2007, October 3). Exercise For Cardiovascular Health Keeps Knee Cartilage Healthy Too, Study Suggests. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2007/09/070928092134.htm
John Wiley & Sons, Inc.. "Exercise For Cardiovascular Health Keeps Knee Cartilage Healthy Too, Study Suggests." ScienceDaily. www.sciencedaily.com/releases/2007/09/070928092134.htm (accessed October 24, 2014).

Share This



More Health & Medicine News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

IKEA Desk Converts From Standing to Sitting With One Button

IKEA Desk Converts From Standing to Sitting With One Button

Buzz60 (Oct. 24, 2014) IKEA is out with a new convertible desk that can convert from a sitting desk to a standing one with just the push of a button. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Ebola Protective Suits Being Made in China

Ebola Protective Suits Being Made in China

AFP (Oct. 24, 2014) A factory in China is busy making Ebola protective suits for healthcare workers and others fighting the spread of the virus. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com
WHO: Millions of Ebola Vaccine Doses by 2015

WHO: Millions of Ebola Vaccine Doses by 2015

AP (Oct. 24, 2014) The World Health Organization said on Friday that millions of doses of two experimental Ebola vaccines could be ready for use in 2015 and five more experimental vaccines would start being tested in March. (Oct. 24) Video provided by AP
Powered by NewsLook.com
Doctor in NYC Quarantined With Ebola

Doctor in NYC Quarantined With Ebola

AP (Oct. 24, 2014) An emergency room doctor who recently returned to the city after treating Ebola patients in West Africa has tested positive for the virus. He's quarantined in a hospital. (Oct. 24) Video provided by AP
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:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

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