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 B&H Deal Finder...
Buy other stuff at Amazon.com...
Capacities up to 56TB and speeds up to 1527MB/s
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$30 $30
SAVE $0

$499 $499
SAVE $0

$150 $150
SAVE $0

$60 $60
SAVE $0

$1149 $899
SAVE $250

$1499 $1259
SAVE $240

$275 $275
SAVE $0

$400 $360
SAVE $40

$372 $247
SAVE $125

$4500 $3500
SAVE $1000

$70 $50
SAVE $20

$1000 $500
SAVE $500

$1398 $898
SAVE $500

$1449 $1199
SAVE $250

$5318 $4918
SAVE $400

$829 $799
SAVE $30

$935 $549
SAVE $386

$309 $259
SAVE $49

$1300 $900
SAVE $400

$450 $280
SAVE $170

$1499 $1249
SAVE $250

$9999 $2999
SAVE $7000

$700 $600
SAVE $100

$349 $199
SAVE $150

$2000 $1270
SAVE $730

$1149 $899
SAVE $250

$1499 $779
SAVE $720

$450 $120
SAVE $330

$349 $199
SAVE $150

$150 $70
SAVE $80

$3998 $3498
SAVE $500

$150 $80
SAVE $70

$369 $175
SAVE $194

$899 $699
SAVE $200

$1699 $1199
SAVE $500

$649 $449
SAVE $200

$1498 $998
SAVE $500

$999 $949
SAVE $50

$1099 $999
SAVE $100

$400 $320
SAVE $80

$2399 $2199
SAVE $200

$199 $99
SAVE $100

$200 $170
SAVE $30

$7697 $4997
SAVE $2700

Nanopollutants Harm Vessel Health

Thinking of going for a training ride when the air pollution is high? Slathering on titanium dioxide sunscreen for your skin health?

Science News (March 11-15, page 18) reports that nanoparticles can impair small blood vessel function. See also Nano Hazards: Exposure to minute particles harms lungs, circulatory system and Exhaust fumes might threaten people's hearts, and more.

These finding are directly relevant to cyclists, or any athlete, and to your health in general. Perhaps these findings dovetail with the increased incidence of asthma near polluted roads and seaports.

One could easily infer that training, especially intensive training, is a Bad Idea in polluted air. My understanding is that diesel exhaust produces particles in the 10 nm range, definitely a nano particle size. I am rarely in favor of government regulation, but I would love to see diesel engines lacking particle traps banned completely.

I’ve long been both suspicious of and disliked sunscreens with titanium dioxide; it permanently stains my leather car seats or anything similar, and generally makes a mess on anything it touches (e.g., a camera). Titanium dioxide is a nanoparticle.

Excerpts:

Vessels called arterioles don’t dilate or constrict appropriately after recent nanoparticle exposure. The changes are small “but equate to a level of impairment that would preclude affected tissues from functioning normally,” says microvascular physiologist Timothy Nurkiewicz of West Virginia University in Morgantown.

...

In one set of tests, physiologist Travis Knuckles of West Virginia University exposed rats to airborne titanium dioxide nanoparticles — spheres 100 billionths of a meter across — for four hours on two consecutive days. The common material appears in a range of materials, including sunscreen and cosmetics.

Twenty-four hours after the second day’s exposure, Knuckles stimulated the animals’ muscles to contract. This triggers arteriole dilation, increasing blood flow. But compared to changes witnessed in rats that had breathed only clean air, vessel dilation in those that had inhaled nanoparticles was impaired.

This diminished vessel relaxation is similar to what elicits a muscle cramp, chest pain in the heart or transient stroke in the brain...

Moreover, the findings showed that vessel impairments did not require lung exposures: In these experiments, ingested nanotubes produced the most dramatic change in arteriole reactivity.

...

toxic immune responses to other nanoparticles.

DIGLLOYD: seems like a good plan to avoid air pollution, exhaust (especially diesel) and titanium dioxide sunscreens. And to be deeply suspicious of any new medicines delivered with nanoparticle carriers; as far as I know nanoparticles are not recognized as something worthy of being tested for health risks.

“Four hours on two consecutive days”— how about 2-3 hours every day for many months, as in a human riding a bike in polluted air?

It would not surprise me if the negative health effects extended well beyond simple impairment of blood vessel function; subtle side effects could also be at play, perhaps mostly short-term, but perhaps also long term and accumulative degradation, a slow downhill slope from which there is no ascent.

Good clean air in the Sierra makes for wonderful riding
View all handpicked deals...

LG UK6300PUE 49" Class HDR UHD Smart IPS LED TV
$499 $499
SAVE $0

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__