On Tue, 20 Mar 2001 07:20:26 -0500, Todd Moody <[log in to unmask]>
wrote:

>To repeat, where is the evidence that something like racketball
>on the days between high-intensity weight training sessions
>causes muscles to shrink?

It seems to me that racketball is like high-impact aerobics. I would
think it's a pretty bad idea considering what it can do to your joints.

Here is an interesting comment on this type of activity and muscle loss:

http://www.nfpt.com/Library/Articles/badnews.html

  Your present metabolic rate will dictate how much aerobic activity
  you can perform while minimizing the risk of muscle tissue loss.
  The lower your metabolic rate, the less muscle tissue you will lose.
  The higher your metabolic rate, the more muscle tissue you will lose.

Is there a definitive scientific study "proving" any of this? Don't
hold your breath. (actually deep breathing exercise may be a very
useful aerobic excercise.)

Philip Thrift
http://www.paleofitness.com