Fascinating that that comes from Sears who is a former trainer to teams of endurance athletes.  Good info.

Jim Swayze
www.fireholecanyon.com


> -------- Original Message --------
> Subject: Dr Sears on paleo exercise
> From: Paleogal <[log in to unmask]>
> Date: Mon, May 05, 2008 4:40 pm
> To: [log in to unmask]
> 
> snip
> 
> "Endurance training forces your heart and lungs to supply energy at 
> continuous, low output, at relatively slow speed, for a long time. Long 
> duration exercises tells your body to store more fat in order to meet the 
> unnatural caloric demands you're placing on it by running all those miles. 
> So when your body's at rest, it's busy getting fatter, not leaner.
> 
> "This type of exercise also puts your body in distress mode. It releases the 
> stress hormone cortisol, which actually boosts triglyceride blood levels and 
> cholesterol oxidation - both things that can clog your arteries and cause 
> heart attacks.  Cortisol also lowers serum testosterone and growth hormone 
> levels, which can lead to depression, decreased muscle mass, and clouded 
> thinking.
> 
> A groundbreaking study of long-distance runners found that after a workout, 
> "bad" cholesterol and triglyceride levels increased and threw blood-clotting 
> factors off-balance, increasing inflammation and clotting incidence. These 
> are both signs of heart distress and precursors to heart attack.
> 
> What you should focus on are high-intensity, short duration exercise 
> routines. These mimic the natural physical demands our pre-historic 
> ancestors confronted every day. Sudden, explosive bursts of speed - to 
> escape danger or capture prey - gave them lean, fit bodies."