Featured Research

from universities, journals, and other organizations

When to end a run to avoid injury: Runners change form when running exhausted

Date:
December 11, 2010
Source:
Indiana University
Summary:
Runners and scientists for years have pondered when runners should end a run in order to avoid injuries. A new study by a physical therapy professor sheds light on this with findings that runners unknowingly change their running form when they run while exhausted. The change in mechanics could be related to an increased risk for injuries.

Runners who continue running when they are exhausted unknowingly change their running form, which could be related to an increased risk for injury. A study by Tracy Dierks, assistant professor of physical therapy at Indiana University, found that toward the end of a normal running session, runners generally displayed an increase in motion in their hips, knees and ankles.

Related Articles


"Our study showed that at the end of a normal run, when they were getting tired, their mechanics were beginning to change," Dierks said. "When you notice fatigue, you're most likely putting yourself at increased risk for injuries if you continue because it's more difficult to control the motion ranges." Dierks said an excessive range of motion in the joints generally is associated with overuse injuries. The extra motion makes it harder for the muscles, tendons and ligaments to handle the strain forces related to running.

Common overuse injuries in runners are patellofemoral pain syndrome and iliotibial band syndrome at the knee and plantar fasciitis at the foot. Dierks' study, "The effects of running in an exerted state on lower extremity kinematics and joint timing," was published in the November Journal of Biomechanics. Co-authors include Irene S. Davis, University of Delaware and the Drayer Physical Therapy Institute; and Joseph Hamill, University of Massachusetts.

About the study:

The study involved 20 uninjured recreational runners ages 18-45. None wore orthotics and each ran at least 10 miles per week. The women and men were fitted with neutral running shoes and tracking markers were placed around their pelvises and along a single leg and foot on each runner.

The runners ran on a treadmill until they either reached 85 percent of the subject's heart rate maximum or a score of 17 (out of 20) on the rating of perceived exertion (RPE). By the end of their runs, all of the runners reported an RPE of at least 15 -- studies have shown that RPEs between 13-15 indicate fatigue.

Dierks said the changes throughout the lower extremities were subtle but more severe in the rearfoot, where there was a "complete breakdown of mechanics."

Dierks said runners and scientists for years have pondered when runners should stop running in order to avoid injuries. Runners' RPEs could provide some answers, with RPEs of 15-17 indicating runners' have reached a point where their mechanics have likely begun to change in an undesirable way.


Story Source:

The above story is based on materials provided by Indiana University. Note: Materials may be edited for content and length.


Cite This Page:

Indiana University. "When to end a run to avoid injury: Runners change form when running exhausted." ScienceDaily. ScienceDaily, 11 December 2010. <www.sciencedaily.com/releases/2010/12/101209113548.htm>.
Indiana University. (2010, December 11). When to end a run to avoid injury: Runners change form when running exhausted. ScienceDaily. Retrieved December 20, 2014 from www.sciencedaily.com/releases/2010/12/101209113548.htm
Indiana University. "When to end a run to avoid injury: Runners change form when running exhausted." ScienceDaily. www.sciencedaily.com/releases/2010/12/101209113548.htm (accessed December 20, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Saturday, December 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

The Best Tips to Curb Holiday Carbs

The Best Tips to Curb Holiday Carbs

Buzz60 (Dec. 19, 2014) It's hard to resist those delicious but fattening carbs we all crave during the winter months, but there are some ways to stay satisfied without consuming the extra calories. Vanessa Freeman (@VanessaFreeTV) has the details. Video provided by Buzz60
Powered by NewsLook.com
Sierra Leone Bikers Spread the Message to Fight Ebola

Sierra Leone Bikers Spread the Message to Fight Ebola

AFP (Dec. 19, 2014) More than 100 motorcyclists hit the road to spread awareness messages about Ebola. Nearly 7,000 people have now died from the virus, almost all of them in west Africa, according to the World Health Organization. Video provided by AFP
Powered by NewsLook.com
Researchers Test Colombian Village With High Alzheimer's Rates

Researchers Test Colombian Village With High Alzheimer's Rates

AFP (Dec. 19, 2014) In Yarumal, a village in N. Colombia, Alzheimer's has ravaged a disproportionately large number of families. A genetic "curse" that may pave the way for research on how to treat the disease that claims a new victim every four seconds. Duration: 02:42 Video provided by AFP
Powered by NewsLook.com
Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Buzz60 (Dec. 19, 2014) A double-amputee makes history by becoming the first person to wear and operate two prosthetic arms using only his mind. Jen Markham has the story. Video provided by Buzz60
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