At 21:36 04 March 2018, wrote:
Very interesting discussion with a lot to think about.=20

I'd just like to make one caution which is do not try to use absolute
value=
s of HR to measure anything. A more reliable measure is % of max HR.
There
=
is much more variability in maximum HR between healthy individuals than
the=
commonly quoted (and discounted in peer reviewed articles) formulas
sugges=
t. I'm a healthy fit 57 yr old male who exercises regularly with a max HR
o=
f over 200, with a similar aged friend who has a max HR under 170.
Interest=
ingly both of us have resting heart rates around 60.=20

I'd be very interested to see a reference to the source of the HR ranges
pu=
blished above, not that a problem with the value of the given ranges
matter=
s to the underlying thesis which is well worth exploring.

On Monday, March 5, 2018 at 6:04:58 AM UTC+10, son_of_flubber wrote:
On Saturday, March 3, 2018 at 6:30:09 AM UTC-5, soarin wrote:
=20
With a heart rate elevated to 115-145 BPM,
complex motor skills, visual reaction times and cognitive reaction
time=
s
are at their peak. However, between 145-175 mental and physical
performance begins to suffer dramatically.=20
=20
I've no problem with the general idea, but since the author suggests
the
=
use of a heart rate monitor to measure stress level in the cockpit, I
quest=
ion the applicability of these specific numbers to pilots of different
ages=
and fitness levels.
=20
Talking averages... A 70 year old pilot would have a maximum heart rate
o=
f 220 - 70 =3D 150 bpm. I'd guess that he would experience debilitating
st=
ress well below 145 bpm. A 20 year old pilot would have a maximum heart
rat=
e of 220 - 20 =3D 200 bpm. =20
=20
I'm not trying to say anything authoritative. I'm just questioning the
n=
umbers presented.
=20
Source for calculation of maximum heart rate:
=20

https://www.mayoclinic.org/healthy-l...h/exercise-in=
tensity/art-20046887?pg=3D2
=20
"to calculate your maximum heart rate is to subtract your age from 220.
F=
or example, if you're 45 years old, subtract 45 from 220 to get a maximum
h=
eart rate of 175."

Mark

Sorry for the delayed response, it took me a while going back thru my
rather extensive lists of links, articles and saved pages to find what I
think your looking for in regard to elevated heart rates with exercise as
opposed to elevated heart rate resulting from the fight or flight response.
This link should answer that.

http://scienceline.org/2007/06/ask-hsu-fightorflight/

I will say that throughout my relatively extensive research into this
subject.
It's been a disappointment to not stumble across some psychology paper or
doctoral thesis that provides all of this data in one source. The majority
of my information has been gleaned from articles relating to police, fire
and military training. While there is no doubt in my mind that there is a
link between the fight or flight response, tunnel vision and glider
accidents. But without tangible proof, it's just a reasonable hypothesis.
But there are allot of glider pilots in the world and if enough of us
start collecting and saving data, maybe eventually some college or
institution will step up and take it on as a project. In the mean time if
anyone finds anything worthwhile relating to this subject, by all means
forward it to me at