The argument he’s making is a bit fantasyland - all things being equal, athlete doesn’t get injured, doesn’t get sick, athlete is genetically predisposed to endurance training and the training prescribed by the coach, coach is competent, athlete recovers properly and on and on and on - yes, if we eliminate all of those variables with all these different sports (swim/bike/run) there is a dose relationship between improvement and time spent on the given activity.
With that being said, the approach by triathlon coaches that I have repeatedly encountered tends to overtrain athletes. They don’t know where the maximums and minimums are for training and racing. One of the biggest of the many variables that prevent triathletes improving in the swim is overtraining the bike and run. There is a view you have to be smashed all the time to make improvements. You don’t. Pro triathletes, in my experience, overtrain and over-race. There are exceptions, but again, in my experience, they are rare. I’ve got some great experience now with pro triathletes that indicate that the body recovers a lot quicker than the brain after a race. The brain takes around 3-4 weeks to recovery for a 70.3. For some of them this is informing their training and racing schedules for the better.
I’ve coached triathletes in the swim for the last decade, based on what I’ve come to know about how the triathlon community approaches swim training (it is changing with some coaches), I can get an athlete as good or better on about 30-40% less training. The experience I’ve had coaching triathletes in s/b/r for the last 5 years is you can train an athlete to be as good or better on 30-40% less training than is generally prescribed.
Hope this helps and if you have any other questions, please let me know.
Tim
http://www.magnoliamasters.com http://www.snappingtortuga.com http://www.swimeasyspeed.com