Sorry Matthias, you are working with an old wives tale as your fitness credo.
Both weights AND cardiovascualar training are essential to the tek diving
efficiency of the older diver. Its one reason why George can do the
schedules he does, and its also a reason why Tom Mount can still do what he
does.  Tom's karate is a combination of weight and aerobic training, i.e,
it works the muscles whenever he does heavy bag workouts, to the point of
anaerobic failure, and it can elevate heart rate to well beyond what we can
acheive on a bike.  It's an excellent cross training in addtion to cycling
and weights. Why do you need this??? Because of the peripherol adaptations
this high degree of resultant fitness will cause.  You end up with far
better perfusion, and much smaller liklihood of muscle constrictions
causing circulatory impairments in response to overwork----over worked
muscles for those who don't bike or run or swim, can result from just doing
a normal dive. As you approach Mount's or George's workouts, you can end up
in a position to be able to  do alot more than talk about tek diving. 
Then of course, George tells you what you need as well, and Tom tells you
what you don't need <g>.

Regards,
Dan Volker

At 10:51 AM 8/17/99 +0200, Matthias Voss wrote:
>Jody Everett (E-mail 2) schrieb:
>> the dive, I find it very hard to believe the recent rash of "heart attacks"
>> that have taken place while diving.  You can't tell me that any logically
>> thinking (I know that's a stretch for many divers involved.) person would
>> honestly believe that all of the recent deaths with rebreather diving and
>> wrecking diving really resulted from heart attacks/natural causes as
>> claimed.
>
>I am sorry to say that i feel that there is some truth in it. Though i
>have heard of many tragic incidents, for those who have died who i knew
>personnaly, the heart thing counts. ( 3 cases in 5 years)
>
>Also I must point out that physical fitness is not everything. Its the
>balance between which amount of oxygen your heart can take and which
>amount your muscles will burn. The sum of both must be smaller than the
>amount of oxygen at disposal in your system. 
>Aging in this sense means an imbalance in favour of the skeletal
>muscles, which may deprive the hearts own arterial system of the
>necessary supply to garanty its survival.
>In consequence one has to carefully chose ones trainings schemes, prefer
>the aerobic workouts ( in favour fo the system) and rather avoid the
>weights ( in favour of ones ego ;-))
>
>- Matthias
>
>- Matthias
>
>
>
>
Dan Volker
SOUTH FLORIDA DIVE JOURNAL
"The Internet magazine for Underwater Photography and mpeg Video"
http://www.sfdj.com
 561-547-9685 
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