Navigation Links
Marathons damage the hearts of less fit runners for up to 3 months
Date:10/24/2010

Montreal - Is running a marathon good for you or can it damage the heart?

A team of researchers and runners from the Heart and Stroke Foundation have come up with a practical way of answering the question. They used data from magnetic resonance imaging (MRI) to find out what is really going on in the marathoner's heart as the kilometers pile up.

"Marathon runners can be a lot less fit than they think," Dr. Eric Larose today told the Canadian Cardiovascular Congress 2010, co-hosted by the Heart and Stroke Foundation and the Canadian Cardiovascular Society.

Lack of real aerobic fitness may directly impact the ways the heart organizes itself to survive the stress of marathon running, says Dr. Larose.

His research found that the magnitude of abnormal heart segments was more widespread and significant in a group of less fit runners. During the marathon, they had signs the heart might be at greater risk of damage than that of runners who had better training or at least had better exercise capacity.

"Without proper training, marathon running can damage your heart. Fortunately the exercise-induced injury is reversible over time," said Dr. Larose. "But it could take up to three months to completely recover."

They studied the effects using MRI measurements, which propel research beyond the traditional stethoscope as a means of estimating and measuring heart function.

The left ventricle of the heart is divided into 17 segments that make up the heart as a whole. When a segment is injured − or stressed out − during the marathon, its neighbours on either side can take over to perform the function of the damaged area. This makes the heart as a whole appear stronger and fitter than is really the case when considering each individual segment.

It also makes it practically impossible for physicians to arrive at an accurate assessment of the heart health of the marathoner when only considering the whole heart.

"The heart isn't simply playing tricks - this may be an important adaptive survival mechanism, like the way the brain can switch function after a stroke," says Dr. Larose. "Unfortunately, as a result, the data produced by traditional means may be inconsistent and misleading.

"This means that, short of performing MRI in everyone, we are left with only one practical test that can accurately tell runners their level of cardiac fitness under stress, " says Dr. Larose, who is professor of medicine at Laval University and a cardiologist and clinical researcher at Institut universitaire de cardiologie et de pneumologie de Qubec (IUCPQ) in Qubec City.

That test is V02 max − the ultimate measure of aerobic endurance.

V02 max directly measures body oxygen consumption and it is the best test to provide an accurate measure of a safe maximum heart rate (number of beats per minute) for runners. In V02 testing, treadmills or stationary bicycles may be used to establish cardiac fitness.

Dr. Larose took healthy amateur runners and performed a full evaluation on them six to eight weeks before, and then immediately after, they ran a marathon. They underwent exercise tests, blood analysis, and magnetic resonance imaging.

"What we did notice in this study is a runner with less preparation before the marathon had lower V02 max, so they had lower exercise capacity. Compared to those runners with better training, they became more dehydrated and their hearts showed greater signs of injury. The less well trained runners also experienced greater loss of function associated with lower blood flow and greater irritation of heart segments."

Heart and Stroke Foundation spokesperson Dr. Beth Abramson says that with the increasing popularity of marathon running, especially among boomers who are putting a marathon on their 'to do' lists, runners need to train properly, stay hydrated, and most importantly, speak to their physicians about what is right for them.

"You can do it − physical activity is very important for your heart health. Just be smart about it: train and get medical advice," says Dr. Abramson. "Not everyone will need extensive testing before training to run a marathon but speaking to your doctor about your cardiac risk is important."

Dr. Larose says there is no substitute for a visit to a healthcare professional and, when appropriate, to get the V02 test to measure risks to your heart.


'/>"/>

Contact: Jane-Diane Fraser
jfraser@hsf.ca
613-569-4361 x273
Heart and Stroke Foundation of Canada
Source:Eurekalert

Related medicine news :

1. 57 Year-Old Grandmother Travels to Atacama Desert to Run First of Four Ultramarathons for Charity
2. Urine protein test might help diagnose kidney damage from lupus, UT Southwestern researchers find
3. Abatement Technologies Announces High-Velocity RAPTOR™ Air Movers for Water Damage Restoration Contractors
4. Damaged protein identified as early diagnostic biomarker for Alzheimers disease in healthy adults
5. Why BPA leached from safe plastics may damage health of female offspring
6. Cutting Off Blood Flow to Heart Cuts Damage During Heart Attack
7. Cutting Off Blood Flow to Heart Limits Damage During Heart Attack
8. Cutting Off Blood Flow Limits Damage During Heart Attack
9. SavATree, Once Again, Helps Clients Recover from Storm Damage
10. New technique reduces tobacco smoke damage to lungs in mice
11. Tiny Fish Might Help Humans Fix Damaged Hearts
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/27/2017)... (PRWEB) , ... June 27, 2017 , ... Dr. Richard ... recent renovation of his practice, Advanced Periodontics and Dental Implant Center of Connecticut. As ... the administrative and waiting areas. The renovations are intended to improve patient comfort while ...
(Date:6/27/2017)... North Hollywood, CA (PRWEB) , ... June 27, ... ... on orthodontic treatments . Orthodontics is a dental specialty that focuses on ... other appliances. Benefits include improved aesthetics and function. , North Hollywood ...
(Date:6/26/2017)... ... June 26, 2017 , ... Torrance dentist, Dr. Robert Mondavi DDS , ... most noticeable aspects of a person’s appearance. A healthy, radiant smile can make a ... balanced teeth, everyone can have the smile of their dreams with cosmetic dentistry. , ...
(Date:6/26/2017)... ... 2017 , ... The Centers for Advanced Orthopaedics (The Centers), ... Robinson as chief operating officer (COO). In this role, Robinson brings more than ... of simplifying business processes and developing growth strategies to increase market share. ...
(Date:6/26/2017)... Lake Tahoe, CA (PRWEB) , ... June 26, 2017 , ... ... seeking 10,000 qualified mental health professionals in every state across the country to join ... an easy and rewarding way for therapists to reach a substantially greater number of ...
Breaking Medicine News(10 mins):
(Date:6/8/2017)... 8, 2017   Responding to Heath Ledger,s ... death of singer Chris Cornell in May, the ... offers a free online psychiatric drug side ... families about psychotropic drug risks. The father ... from an accidental overdose, has called for tighter rules on ...
(Date:6/5/2017)... Cincinnati location of Diplomat Specialty Infusion ... been awarded a Top Workplaces 2017 honor by ... on an employee survey administered by WorkplaceDynamics, LLC, a research ... measures several aspects of workplace culture, including alignment, execution, and ... ...
(Date:5/30/2017)... 30, 2017 DarioHealth Corp. (NASDAQ: DRIO), a leading global ... announced that it will be presenting at the 7th annual LD ... Erez Raphael , CEO, of DarioHealth will be giving the ... held on June 6th & 7th, 2017 at the Luxe Sunset ... / micro-cap space. About LD ...
Breaking Medicine Technology: