Excessive Endurance Training Can Be Too Much of a Good Thing

I'm not a doctor but… 
Cycling injury, recovery and health issues.
Forum rules
The information / discussion in the Cycling Health Forum is not qualified medical advice. Please consult your doctor.

Excessive Endurance Training Can Be Too Much of a Good Thing

Postby wombatK » Tue Jun 05, 2012 10:23 pm

Too date, medical research has been a bit vague about what is too much exercise and whether it is risky.

Dr James O'Keefe from St Luke's Hospital (USA) Kansas has published some research that
clarifies things:
Physical exercise, though not a drug, possesses many traits of a powerful pharmacologic agent. A routine of daily physical activity can be highly effective for prevention and treatment of many diseases, including coronary heart disease, hypertension, heart failure, and obesity," says lead author James H. O'Keefe, MD, of Saint Luke's Hospital of Kansas City, MO. "However, as with any pharmacologic agent, a safe upper dose limit potentially exists, beyond which the adverse effects of physical exercise, such as musculoskeletal trauma and cardiovascular stress, may outweigh its benefits

http://www.sciencedaily.com/releases/20 ... 093108.htm

In other interviews Dr O'Keefe suggests
Endurance sports such as ultramarathon running or professional cycling have been associated with a five-fold increase in the prevalence of atrial fibrillation, or abnormal heart rhythms.
...
Extreme exercise is not really conducive to great cardiovascular health. Beyond 30-60 minutes per day, you reach a point of diminishing return

I'd average a couple of hours every second day, but this has got me wondering - would it be smarter to back-off to something under an hour a day ?

Cheers
WombatK

Somebody has to do something, and it's just incredibly pathetic that it has to be us -Jerry Garcia
User avatar
wombatK
 
Posts: 5212
Joined: Thu Jul 10, 2008 9:08 pm
Location: Yagoona, AU

by BNA » Tue Jun 05, 2012 10:54 pm

BNA
 

Re: Excessive Endurance Training Can Be Too Much of a Good T

Postby PawPaw » Tue Jun 05, 2012 10:54 pm

AF is absolutely a risk factor of higher intensity cardio exercise in those over 30-35.
However, I think more studies need to be done to rule out multiple risk factors.
i.e.
history of being overweight, then using exercise to lose that weight.
stress levels
caffeine sensitivity
sleep quality
diet
BP
low grade inflammation
family history
etc
etc
User avatar
PawPaw
 
Posts: 1244
Joined: Sat Dec 10, 2011 6:53 am
Location: Brisbane

Re: Excessive Endurance Training Can Be Too Much of a Good T

Postby Crittski » Tue Jun 05, 2012 11:11 pm

PawPaw wrote:AF is absolutely a risk factor of higher intensity cardio exercise in those over 30-35.


Don't you mean that high intensity cardio exercise is a risk factor for AF?
Santa Cruz Blur TRc XTR
Volagi Liscio Ultegra
Crittski
 
Posts: 391
Joined: Sat Oct 02, 2010 7:06 am

Re: Excessive Endurance Training Can Be Too Much of a Good T

Postby PawPaw » Tue Jun 05, 2012 11:54 pm

Crittski wrote:Don't you mean that high intensity cardio exercise is a risk factor for AF?


Yes, sorry. Long day and trying to stay up for a bit of the Dauphine.
User avatar
PawPaw
 
Posts: 1244
Joined: Sat Dec 10, 2011 6:53 am
Location: Brisbane

Re: Excessive Endurance Training Can Be Too Much of a Good T

Postby brawlo » Wed Jun 06, 2012 9:45 am

I think it's more along the lines of high intensity cardio.

I have tried the Les Mills Body Attack class, and kept it up for a few months before it started doing naughty things to my knees. Those classes were for 45min. I don't ride long distances, but do do 1-2hr sessions, and they are nowhere near that level of intensity. I would say that in total, a 1 1/2 - 2hr ride would roughly be the equivalent of say a 1hr high intensity cardio session like aerobics or a run perhaps. Riding you get a lot of breaks like going downhill, etc. If you ride in bunches, you get more breaks, thus reducing the intensity.

Of course that does depend on your riding style.
brawlo
 
Posts: 391
Joined: Fri Dec 18, 2009 4:01 pm
Location: Goulburn, NSW

Re: Excessive Endurance Training Can Be Too Much of a Good T

Postby Abby » Wed Jun 06, 2012 10:48 am

I've got a hypothesis (totally untested) that the main problem that leads to these heart issues in 'endurance athletes' is people trying to train through illness.

I reckon that too many of us all try and be 'hard' and push through colds, viruses, etc, and keep up training volumes and intensity. And for those unlucky ones who are already predisposed to heart issues, this can cause some serious damage.

I'm a big fan of just letting training go when you are sick. It can be hard at times - I know I'm on my 10th day off the bike after getting sick on a work trip to Canberra, and my season goal of the Avanti Classic is less than 3 weeks away. The temptation is strong to jump on the bike, HTFU, and get some k's into the legs.

But if you can keep your long-term view in focus it makes total sense. I figure I still want to be cycling centuries and even racing in 10, 20, 30 years time. In the context of that, a couple of weeks lost to illness here and there is not even a drop in the ocean, and is hardly worth risking long-term damage for...

Cheers,
Abby
Abby
 
Posts: 221
Joined: Fri May 21, 2010 11:41 am

Re: Excessive Endurance Training Can Be Too Much of a Good T

Postby twizzle » Wed Jun 06, 2012 2:40 pm

The studies and stats relate to PROFESSIONAL sports, not commuters/amateur, none of us is doing 20+ hours a week of solid REAL training. 300+ members in the ACT vets club, I've been a member for 3+ years, nil cases of atrial fib. in an event. One former member in his late 70's/ early 80's literally dropped dead last year from a heart attack just after returning from a ride, but that can happen to anyone.

The rule-of-thumb for training is that if you are doing less than 10 hours a week, you aren't doing enought to maintain a solid aerobic base, once you drop down to 7 hours a week you have to concentrate on intensive intervals to maintain a decent level of fitness.

Coupla hours riding occasionally? Very unlikely to be an issue. Besdies which, everyone consulted their doctor "before starting a training regime", didn't they?
I ride, therefore I am.
...real cyclists don't have squeaky chains...
User avatar
twizzle
 
Posts: 6382
Joined: Wed Aug 13, 2008 11:45 am
Location: Taking a break.

Excessive Endurance Training Can Be Too Much of a Good Thing

Postby toolonglegs » Wed Jun 06, 2012 3:38 pm

Ultra marathon and professional cyclist doesn't mean many people here like Twiz says... I am not worried in the 10-15 hours hard riding a week... And I do have heart issues... Which reminds me it is time for another scan :-| .
Image
User avatar
toolonglegs
 
Posts: 14380
Joined: Fri Jun 29, 2007 7:49 pm
Location: Somewhere with padded walls and really big hills!

Re: Excessive Endurance Training Can Be Too Much of a Good T

Postby Ant. » Wed Jun 27, 2012 9:07 pm

Cervélo R3
Cervélo P3C
BT Blade
Ant.
 
Posts: 758
Joined: Sun Oct 26, 2008 8:34 am
Location: Perth

Re: Excessive Endurance Training Can Be Too Much of a Good T

Postby Parrott » Thu Jun 28, 2012 6:23 pm

Fish oil may help reduce the risk of VF(which is a little bit worse than AF :) ) , don't know about AF.

I had an episode of AF about 9 years ago reverted with a beta blocker. Hasn't recurred since then despite plenty of maximal exertions on the bike.
User avatar
Parrott
 
Posts: 2960
Joined: Wed Apr 18, 2007 8:45 pm

Re: Excessive Endurance Training Can Be Too Much of a Good T

Postby Davobel » Sat Jul 14, 2012 12:46 am

Read up on 'Overtraining Syndrome'.
Davobel
 
Posts: 48
Joined: Sat Jun 04, 2011 6:16 pm


Return to Cycling Health

Who is online

Users browsing this forum: No registered users



Popular Bike Shops
Torpedo 7 Torpedo7 AU
Ground Effect Ground Effect NZ
Chain Reaction Cycles CRC UK
Wiggle Wiggle UK
Ebay Ebay AU

“Bicycles BNA Twitter
“Bicycles BNA Facebook
“Google+ BNA Google+
“Bicycles BNA Newsletter

> FREE BNA Stickers
> BNA Cycling Kit