"Last time I checked, you weren't Kenyan or Ethiopian."
Which is why I also mention "some Westerners". Quite a few, in fact.
"Aren't Kenyans and Ethiopians primarily vegetarian? That would explain why they didn't evolve to have to sprint for food."
Ever been to an Ethiopian restaurant? ;0)
See also persistence hunting. There is a lot of stuff out there on the subject.
This link will get you started.
http://en.wikipedia.org/wiki/Persistence_hunting#Persistence_hunting_in_human_evolution
"Your comment about exhausting much faster and enduring animals is amusing. The problem with your statement is that running the equivalent of a marathon daily until you exhaust a food source would require levels of glycogen stores that wouldn't have been available. This is why they were hunting. In fact, depleting glycogen stores to such a significant degree would mean becoming prey rather than being prey, if you know what I mean. Not to mention the influx of cortisol and reduction in positive hormones."
Amusing, except that it is true. See persistence hunting, above. The people who practiced it didn't run a marathon every day. One kill would last a small group for
many days, when combined with the edibles gathered by non hunters in the group. Also, these people probably spent a considerable amount of time in a ketotic state, where glycogen was not the main fuel source. Not sure what you're getting at with the cortisol line of argument.
"I suspect we would not have survived as a species." Yet that type of hunting was practiced, and here we are.
"Humans aren't stupid. If they can scavenge and sprint in groups, they will. And they did."
Scavenging I can accept as a possible food source of opportunity, if the meat hadn't gone bad, but you still haven't made a case fo humans outsprinting an antelope or deer.
Successful marathoners have to train running long distance because…they run long distances. This is called specificity of training. They also "teach" their bodies to work under this type of stress (to the feet, knees, etc). You are confusing training intervals with training for a marathon. I simply said that intervals will improve your cardiovascular conditioning better than long distance running and I stand by that. Way more positives with respect to health."
I am quite familiar with specificity of training, David. As I said earlier, intervals are an integral part of training for a marathon, so I am not sure what you are getting at here. As for intervals providing better cardio vascular fitness than
distance running, I find that to be not credible. References?
"As far as reducing testosterone, you could read this recent study: Source:
Arq Bras Endocrinol Metabol. 2006 Dec;50(6):1082-7."
Mine was always normal when I had blood work done, and I was doing ~70 miles/week in the build up phase of marathon training. I doubt I was much different than all the others I ran with/competed against.
"Which body is better for health and performance?"
The one that isn't a result of anabolic steroids?