All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: MacPerformanceGuide.com and WindInMyFace.com
Thank you for purchasing through links and ads on this site.
OWC / MacSales.com...
diglloyd Deal Finder...
Buy other stuff at Amazon.com...
Durable and fast, up to 1800MB/s

Extreme Exercise May Induce Low-Level Arteriolosclerosis

I’ve long stated here that I count cycling as a major health benefit, both physically and mentally, and the more time goes on, the more strongly that idea is supported by the evidence of my own decades of self-monitoring.

Still, I had not ruled out some possible downsides. Those include development of an irregular heartbeat (which I’ve experienced under extreme training loads, gone when backing off).

But what I had not considered was low-level arteriosclerosis. Recently I had a CT heart calcium scan* score of 91 which is the 88th percentile for my age range (99 is the worst). That was a bit shocking and disappointing; I was expecting something like 0 to 5.

* I had the scan done because during my concussion, a CT scan of my head showed calcification in two major arteries in my brain.

So I saw a cardiologist and had my carotid arteries and heart scanned. They showed low level arteriosclerosis. However, my femoral arteries, listened-to by the cardiologist, have no auditory evidence of any issue.

The cardiologist pointed me to a study which suggests that the trauma of high volumes of intense exercise can induce low-level arteriosclerosis. As I understand it, the volume of blood being pushed through with great force in essence can irritate the artery walls, and this causes low-level inflammation, which leads to arteriosclerosis.

Still, one gets all the upsides of exercise, so this theoretical downside concerns me little.

Relationship Between Lifelong Exercise Volume and Coronary Atherosclerosis in Athletes

Conclusions: Participants in the >2000 MET-min/wk group had a higher prevalence of CAC and atherosclerotic plaques. The most active group, however, had a more benign composition of plaques, with fewer mixed plaques and more often only calcified plaques. These observations may explain the increased longevity typical of endurance athletes despite the presence of more coronary atherosclerotic plaque in the most active participants.

My minimum daily workout is about 1000 calories (kilocalories) at the crank = ~4000 KCal physiologically, assuming a physiological efficiency of 25% (I am 99% sure that I am at 25% or even 26% or 27%, based on the long habit of calculating calories to the gram of food, and my SRM power meter with at most 1% error).

MET (metabolic equivalent) = kcal / kg / hours

Note that "weight in kg" is just plain silly as it has a very large margin of error—8% body fat or 28%?

If I have this right, my base workout is as follows:

(4000 kg / 80 kg / (84 min/60 min/hour) ) = 35 MET hours = 2100 MET minutes per week (MINIMUM)

That’s just baseline. Back in January/February, I was doing about 2.5X that amount for 4 weeks, for example this day.

B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 12 hours unless noted. Certain deals may last longer.
$999 SAVE $700 = 41.0% Canon EOS 6D DSLR in Cameras: DSLR
$1497 SAVE $500 = 25.0% Nikon D750 DSLR in Cameras: DSLR
$1997 SAVE $1100 = 35.0% Nikon D750 DSLR with 24-120mm in Cameras: DSLR
$1697 SAVE $200 = 10.0% Pentax K-1 DSLR in Cameras: DSLR
$1998 SAVE $400 = 16.0% Sony a7R II Mirrorless in Cameras: Mirrorless
$368 SAVE $80 = 17.0% Sony DSC-RX100 in Cameras: Point and Shoot
$1349 SAVE $150 = 10.0% ZEISS 18mm f/2.8 Batis in Lenses: Mirrorless

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2008-2017 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__